[JavaWeb]微头条项目

完整笔记和项目代码：
https://pan.baidu.com/s/1PZBO0mfpwDPic4Ezsk8orA?pwd=wwp5 提取码: wwp5

JavaWeb-微头条项目开发

1 项目简介

1.1 业务介绍

微头条新闻发布和浏览平台,主要包含业务如下

  • 用户功能
    • 注册功能
    • 登录功能
  • 头条新闻
    • 新闻的分页浏览
    • 通过标题关键字搜索新闻
    • 查看新闻详情
    • 新闻的修改和删除
  • 权限控制
    • 用户只能修改和自己发布的头条新闻

1.2 技术栈介绍

前端技术栈

  • ES6作为基础JS语法
  • nodejs用于运行环境
  • npm用于项目依赖管理工具
  • vite用于项目的构建架工具
  • Vue3用于项目数据的渲染框架
  • Axios用于前后端数据的交互
  • Router用于页面的跳转
  • Pinia用于存储用户的数据
  • LocalStorage作为用户校验token的存储手段
  • Element-Plus提供组件

后端技术栈

  • JAVA作为开发语言,版本为JDK17
  • Tomcat作为服务容器,版本为10.1.7
  • Mysql8用于项目存储数据
  • Servlet用于控制层实现前后端数据交互
  • JDBC用于实现数据的CURD
  • Druid用于提供数据源的连接池
  • MD5用于用户密码的加密
  • Jwt用于token的生成和校验
  • Jackson用于转换JSON
  • Filter用于用户登录校验和跨域处理
  • Lombok用于处理实体类

1.3 后端项目结构

创建Web项目

在这里插入图片描述

导入依赖

在这里插入图片描述

准备包结构

在这里插入图片描述

  • controller 控制层代码,主要由Servlet组成
  • service 服务层代码,主要用于处理业务逻辑
  • dao 数据访问层,主要用户定义对于各个表格的CURD的方法
  • pojo 实体类层,主要用于存放和数据库对应的实体类以及一些VO对象
  • util 工具类包,主要用存放一些工具类
  • common 公共包,主要用户存放一些其他公共代码
  • filters 过滤器包,专门用于存放一些过滤器
  • test 测试代码包,专门用于定义一些测试的功能代码,上线前应该删掉,后期用maven可以自动处理掉

2 项目框架源码和注解

2.1 工具类

2.1.1 异步响应规范格式类

  • Result类
package com.atguigu.headline.common;/*** 全局统一返回结果类**/
public class Result<T> {// 返回码private Integer code;// 返回消息private String message;// 返回数据private T data;public Result(){}// 返回数据protected static <T> Result<T> build(T data) {Result<T> result = new Result<T>();if (data != null)result.setData(data);return result;}public static <T> Result<T> build(T body, Integer code, String message) {Result<T> result = build(body);result.setCode(code);result.setMessage(message);return result;}public static <T> Result<T> build(T body, ResultCodeEnum resultCodeEnum) {Result<T> result = build(body);result.setCode(resultCodeEnum.getCode());result.setMessage(resultCodeEnum.getMessage());return result;}/*** 操作成功* @param data  baseCategory1List* @param <T>* @return*/public static<T> Result<T> ok(T data){Result<T> result = build(data);return build(data, ResultCodeEnum.SUCCESS);}public Result<T> message(String msg){this.setMessage(msg);return this;}public Result<T> code(Integer code){this.setCode(code);return this;}public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}public T getData() {return data;}public void setData(T data) {this.data = data;}
}
  • ResultCodeEnum 枚举类
package com.atguigu.headline.common;
/*** 统一返回结果状态信息类**/
public enum ResultCodeEnum {SUCCESS(200,"success"),USERNAME_ERROR(501,"usernameError"),PASSWORD_ERROR(503,"passwordError"),NOTLOGIN(504,"notLogin"),USERNAME_USED(505,"userNameUsed");private Integer code;private String message;private ResultCodeEnum(Integer code, String message) {this.code = code;this.message = message;}public Integer getCode() {return code;}public String getMessage() {return message;}
}

2.1.2 MD5加密工具类

package com.atguigu.headline.util;import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;public final class MD5Util {public static String encrypt(String strSrc) {try {char hexChars[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8','9', 'a', 'b', 'c', 'd', 'e', 'f' };byte[] bytes = strSrc.getBytes();MessageDigest md = MessageDigest.getInstance("MD5");md.update(bytes);bytes = md.digest();int j = bytes.length;char[] chars = new char[j * 2];int k = 0;for (int i = 0; i < bytes.length; i++) {byte b = bytes[i];chars[k++] = hexChars[b >>> 4 & 0xf];chars[k++] = hexChars[b & 0xf];}return new String(chars);} catch (NoSuchAlgorithmException e) {e.printStackTrace();throw new RuntimeException("MD5加密出错！！+" + e);}}
}

2.1.3 JDBCUtil连接池工具类

package com.atguigu.headline.util;import com.alibaba.druid.pool.DruidDataSourceFactory;import javax.sql.DataSource;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;public class JDBCUtil {private static ThreadLocal<Connection> threadLocal =new ThreadLocal<>();private static DataSource dataSource;// 初始化连接池static{// 可以帮助我们读取.properties配置文件Properties properties =new Properties();InputStream resourceAsStream = JDBCUtil.class.getClassLoader().getResourceAsStream("jdbc.properties");try {properties.load(resourceAsStream);} catch (IOException e) {throw new RuntimeException(e);}try {dataSource = DruidDataSourceFactory.createDataSource(properties);} catch (Exception e) {throw new RuntimeException(e);}}/*1 向外提供连接池的方法*/public static DataSource getDataSource(){return dataSource;}/*2 向外提供连接的方法*/public static Connection getConnection(){Connection connection = threadLocal.get();if (null == connection) {try {connection = dataSource.getConnection();} catch (SQLException e) {throw new RuntimeException(e);}threadLocal.set(connection);}return connection;}/*定义一个归还连接的方法 (解除和ThreadLocal之间的关联关系) */public static void releaseConnection(){Connection connection = threadLocal.get();if (null != connection) {threadLocal.remove();// 把连接设置回自动提交的连接try {connection.setAutoCommit(true);// 自动归还到连接池connection.close();} catch (SQLException e) {throw new RuntimeException(e);}}}
}

添加jdbc.properties配置文件

driverClassName=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/top_news
username=root
password=root
initialSize=5
maxActive=10
maxWait=1000

2.1.4 JwtHelper工具类

package com.atguigu.headline.util;import com.alibaba.druid.util.StringUtils;
import io.jsonwebtoken.*;import java.util.Date;public class JwtHelper {private static long tokenExpiration = 24*60*60*1000;private static String tokenSignKey = "123456";//生成token字符串public static String createToken(Long userId) {String token = Jwts.builder().setSubject("YYGH-USER").setExpiration(new Date(System.currentTimeMillis() + tokenExpiration)).claim("userId", userId).signWith(SignatureAlgorithm.HS512, tokenSignKey).compressWith(CompressionCodecs.GZIP).compact();return token;}//从token字符串获取useridpublic static Long getUserId(String token) {if(StringUtils.isEmpty(token)) return null;Jws<Claims> claimsJws = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);Claims claims = claimsJws.getBody();Integer userId = (Integer)claims.get("userId");return userId.longValue();}//判断token是否有效public static boolean isExpiration(String token){try {boolean isExpire = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token).getBody().getExpiration().before(new Date());//没有过期，有效，返回falsereturn isExpire;}catch(Exception e) {//过期出现异常，返回truereturn true;}}
}

2.1.5 JSON转换的WEBUtil工具类

package com.atguigu.headline.util;import com.atguigu.headline.common.Result;
import com.fasterxml.jackson.databind.ObjectMapper;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.BufferedReader;
import java.io.IOException;
import java.text.SimpleDateFormat;public class WebUtil {private static ObjectMapper objectMapper;// 初始化objectMapperstatic{objectMapper=new ObjectMapper();// 设置JSON和Object转换时的时间日期格式objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));}// 从请求中获取JSON串并转换为Objectpublic static <T> T readJson(HttpServletRequest request,Class<T> clazz){T t =null;BufferedReader reader = null;try {reader = request.getReader();StringBuffer buffer =new StringBuffer();String line =null;while((line = reader.readLine())!= null){buffer.append(line);}t= objectMapper.readValue(buffer.toString(),clazz);} catch (IOException e) {throw new RuntimeException(e);}return t;}// 将Result对象转换成JSON串并放入响应对象public static void writeJson(HttpServletResponse response, Result result){response.setContentType("application/json;charset=UTF-8");try {String json = objectMapper.writeValueAsString(result);response.getWriter().write(json);} catch (IOException e) {throw new RuntimeException(e);}}
}

2.2 实体类和VO对象

2.2.1 NewsUser

package com.atguigu.headline.pojo;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;@AllArgsConstructor
@NoArgsConstructor
@Data
public class NewsUser implements Serializable {private Integer uid;private String username;private String userPwd;private String nickName;
}

2.2.2 NewsType

package com.atguigu.headline.pojo;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;@AllArgsConstructor
@NoArgsConstructor
@Data
public class NewsType implements Serializable {private Integer tid;private String tname;
}

2.2.3 NewsHeadline

package com.atguigu.headline.pojo;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;
import java.util.Date;@AllArgsConstructor
@NoArgsConstructor
@Data
public class NewsHeadline implements Serializable {private Integer hid;private String title;private String article;private Integer type;private Integer publisher;private Integer pageViews;private Date createTime;private Date updateTime;private Integer isDeleted;}

2.2.4 HeadlineQueryVo

package com.atguigu.headline.pojo.vo;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;@AllArgsConstructor
@NoArgsConstructor
@Data
public class HeadlineQueryVo implements Serializable {private String keyWords;private Integer type ;private Integer pageNum;private Integer pageSize;
}

2.2.5 HeadlinePageVo

package com.atguigu.headline.pojo.vo;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;@AllArgsConstructor
@NoArgsConstructor
@Data
public class HeadlinePageVo implements Serializable {private Integer hid;private String title;private Integer type;private Integer pageViews;private Long pastHours;private Integer publisher;
}

2.2.6 HeadlineDetailVo

package com.atguigu.headline.pojo.vo;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;@AllArgsConstructor
@NoArgsConstructor
@Data
public class HeadlineDetailVo implements Serializable {private Integer hid;private String title;private String article;private Integer type;private String typeName;private Integer pageViews;private Long pastHours;private Integer publisher;private String author;
}

2.3 Dao层

在这里插入图片描述

BaseDao基础类,封装了公共的查询方法和公共的增删改方法

注意,所有的Dao接口的实现类都要继承BaseDao

2.3.1 BaseDao

package com.atguigu.headline.dao;import com.atguigu.headline.util.JDBCUtil;
import java.lang.reflect.Field;
import java.sql.*;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;public class BaseDao {// 公共的查询方法  返回的是单个对象public <T> T baseQueryObject(Class<T> clazz, String sql, Object ... args) {T t = null;Connection connection = JDBCUtil.getConnection();PreparedStatement preparedStatement = null;ResultSet resultSet = null;int rows = 0;try {// 准备语句对象preparedStatement = connection.prepareStatement(sql);// 设置语句上的参数for (int i = 0; i < args.length; i++) {preparedStatement.setObject(i + 1, args[i]);}// 执行 查询resultSet = preparedStatement.executeQuery();if (resultSet.next()) {t = (T) resultSet.getObject(1);}} catch (Exception e) {throw new RuntimeException(e);} finally {if (null != resultSet) {try {resultSet.close();} catch (SQLException e) {throw new RuntimeException(e);}}if (null != preparedStatement) {try {preparedStatement.close();} catch (SQLException e) {throw new RuntimeException(e);}}JDBCUtil.releaseConnection();}return t;}// 公共的查询方法  返回的是对象的集合public <T> List<T> baseQuery(Class clazz, String sql, Object ... args){List<T> list =new ArrayList<>();Connection connection = JDBCUtil.getConnection();PreparedStatement preparedStatement=null;ResultSet resultSet =null;int rows = 0;try {// 准备语句对象preparedStatement = connection.prepareStatement(sql);// 设置语句上的参数for (int i = 0; i < args.length; i++) {preparedStatement.setObject(i+1,args[i]);}// 执行 查询resultSet = preparedStatement.executeQuery();ResultSetMetaData metaData = resultSet.getMetaData();int columnCount = metaData.getColumnCount();// 将结果集通过反射封装成实体类对象while (resultSet.next()) {// 使用反射实例化对象Object obj =clazz.getDeclaredConstructor().newInstance();for (int i = 1; i <= columnCount; i++) {String columnName = metaData.getColumnLabel(i);Object value = resultSet.getObject(columnName);// 处理datetime类型字段和java.util.Data转换问题if(value.getClass().equals(LocalDateTime.class)){value= Timestamp.valueOf((LocalDateTime) value);}Field field = clazz.getDeclaredField(columnName);field.setAccessible(true);field.set(obj,value);}list.add((T)obj);}} catch (Exception e) {throw new RuntimeException(e);} finally {if (null !=resultSet) {try {resultSet.close();} catch (SQLException e) {throw new RuntimeException(e);}}if (null != preparedStatement) {try {preparedStatement.close();} catch (SQLException e) {throw new RuntimeException(e);}}JDBCUtil.releaseConnection();}return list;}// 通用的增删改方法public int baseUpdate(String sql,Object ... args) {// 获取连接Connection connection = JDBCUtil.getConnection();PreparedStatement preparedStatement=null;int rows = 0;try {// 准备语句对象preparedStatement = connection.prepareStatement(sql);// 设置语句上的参数for (int i = 0; i < args.length; i++) {preparedStatement.setObject(i+1,args[i]);}// 执行 增删改 executeUpdaterows = preparedStatement.executeUpdate();// 释放资源(可选)} catch (SQLException e) {throw new RuntimeException(e);} finally {if (null != preparedStatement) {try {preparedStatement.close();} catch (SQLException e) {throw new RuntimeException(e);}}JDBCUtil.releaseConnection();}// 返回的是影响数据库记录数return rows;}
}

2.3.2 Dao层所有接口

package com.atguigu.headline.dao;
public interface NewsHeadLineDao {}package com.atguigu.headline.dao;
public interface NewsTypeDao {}package com.atguigu.headline.dao;
public interface NewsUserDao {}

2.3.3 dao层所有实现类

package com.atguigu.headline.dao.impl;
import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{}package com.atguigu.headline.dao.impl;
import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsTypeDao;
public class NewsTypeDaoImpl extends BaseDao implements NewsTypeDao{}package com.atguigu.headline.dao.impl;
import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsUserDao;
public class NewsUserDaoImpl extends BaseDao implements NewsUserDao{}

2.4 Service层

在这里插入图片描述

2.4.1 service层所有接口

package com.atguigu.headline.service;
public interface NewsHeadlineService {}package com.atguigu.headline.service;
public interface NewsTypeService {List<NewsType> findAll();
}package com.atguigu.headline.service;
public interface NewsUserService {}

2.4.2 service层所有实现类

package com.atguigu.headline.service.impl;
import com.atguigu.headline.service.NewsHeadlineService;
public class NewsHeadlineServiceImpl  implements NewsHeadlineService {
}package com.atguigu.headline.service.impl;
import com.atguigu.headline.service.NewsTypeService;
public class NewsTypeServiceImpl implements NewsTypeService {}package com.atguigu.headline.service.impl;
import com.atguigu.headline.service.NewsUserService;
public class NewsUserServiceImpl implements NewsUserService {}

2.5 Controller层

BaseController 用于将路径关联到处理方法的基础控制器，所有的Controller都要继承该类

2.5.1 BaseController

package com.atguigu.headline.controller;import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
import java.lang.reflect.Method;public class BaseController extends HttpServlet {@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {// 响应的MIME类型和乱码问题resp.setContentType("application/json;charset=UTF-8");String requestURI = req.getRequestURI();String[] split = requestURI.split("/");String methodName =split[split.length-1];// 通过反射获取要执行的方法Class clazz = this.getClass();try {Method method=clazz.getDeclaredMethod(methodName,HttpServletRequest.class,HttpServletResponse.class);// 设置方法可以访问method.setAccessible(true);// 通过反射执行代码method.invoke(this,req,resp);} catch (Exception e) {e.printStackTrace();throw new RuntimeException(e.getMessage());}}
}

2.5.2 所有的Controller类

package com.atguigu.headline.controller;
import jakarta.servlet.annotation.WebServlet;
@WebServlet("/headline/*")
public class NewsHeadlineController extends BaseController {}package com.atguigu.headline.controller;
import jakarta.servlet.annotation.WebServlet;
@WebServlet("/type/*")
public class NewsTypeController {}package com.atguigu.headline.controller;
import jakarta.servlet.annotation.WebServlet;
@WebServlet("/user/*")
public class NewsUserController extends BaseController{}package com.atguigu.headline.controller;
import jakarta.servlet.annotation.WebServlet;
@WebServlet("/portal/*")
public class PortalController extends BaseController{}

2.6 过滤器

2.6.1 跨域过滤器

package com.atguigu.headline.filters;import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;@WebFilter("/*")
public class CrosFilter implements Filter {@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpServletResponse response = (HttpServletResponse) servletResponse;HttpServletRequest request =(HttpServletRequest) servletRequest;response.setHeader("Access-Control-Allow-Origin", "*");response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");response.setHeader("Access-Control-Max-Age", "3600");response.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");// 非预检请求,放行即可,预检请求,则到此结束,不需要放行if(!request.getMethod().equalsIgnoreCase("OPTIONS")){filterChain.doFilter(servletRequest, servletResponse);}}
}

3 项目具体实现

3.1 登录注册功能

3.1.1 登录表单提交

在这里插入图片描述

需求描述

  • 用户在客户端输入用户名密码并向后端提交,后端根据用户名和密码判断登录是否成功,用户有误或者密码有误响应不同的提示信息

uri:

user/login

请求方式:

POST

请求参数

{"username":"zhangsan", //用户名"userPwd":"123456"     //明文密码
}

响应示例

  • 登录成功
{"code":"200",         // 成功状态码 "message":"success"   // 成功状态描述"data":{"token":"... ..." // 用户id的token}
}
  • 用户名有误
{"code":"501","message":"用户名有误""data":{}
}
  • 密码有误
{"code":"503","message":"密码有误""data":{}
}

后端代码

  • NewsUserController
package com.atguigu.headline.controller;import com.atguigu.headline.common.Result;
import com.atguigu.headline.common.ResultCodeEnum;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.service.impl.NewsUserServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.MD5Util;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
import java.util.HashMap;
import java.util.Map;@WebServlet("/user/*")
public class NewsUserController extends BaseController{private NewsUserService newsUserService =new NewsUserServiceImpl();/*** 登录验证* @param req* @param resp* @throws ServletException* @throws IOException*/protected void login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {NewsUser newsUser = WebUtil.readJson(req, NewsUser.class);Result result =null;NewsUser loginNewsUser =newsUserService.findByUserName(newsUser.getUsername());// 判断用户名if (null != loginNewsUser) {// 判断密码if(loginNewsUser.getUserPwd().equals(MD5Util.encrypt(newsUser.getUserPwd()))){// 密码正确Map<String,Object> data =new HashMap<>();// 生成token口令String token = JwtHelper.createToken(loginNewsUser.getUid().longValue());// 封装数据mapdata.put("token",token);// 封装结果result=Result.ok(data);}else{// 封装密码错误结果result=Result.build(null, ResultCodeEnum.PASSWORD_ERROR);}}else{// 封装用户名错误结果result=Result.build(null, ResultCodeEnum.USERNAME_ERROR);}// 响应结果WebUtil.writeJson(resp,result);}
}
  • NewsUserService
package com.atguigu.headline.service;import com.atguigu.headline.pojo.NewsUser;public interface NewsUserService {/*** 根据用户名,获得查询用户的方法* @param username 要查询的用户名* @return 如果找到返回NewsUser对象,找不到返回null*/NewsUser findByUserName(String username);
}
  • NewsUserServiceImpl
package com.atguigu.headline.service.impl;import com.atguigu.headline.dao.NewsUserDao;
import com.atguigu.headline.dao.impl.NewsUserDaoImpl;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsTypeService;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.util.MD5Util;public class NewsUserServiceImpl implements NewsUserService {private NewsUserDao newsUserDao =new NewsUserDaoImpl();@Overridepublic NewsUser findByUserName(String username) {return newsUserDao.findByUserName(username);}
}
  • NewUserDao
package com.atguigu.headline.dao;
import com.atguigu.headline.pojo.NewsUser;public interface NewsUserDao {/*** 根据用户名查询用户信息* @param username 要查询的用户名* @return 找到返回NewsUser对象,找不到返回null*/NewsUser findByUserName(String username);
}
  • NewsUserDaoImpl
package com.atguigu.headline.dao.impl;import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsUserDao;
import com.atguigu.headline.pojo.NewsUser;
import java.util.List;public class NewsUserDaoImpl extends BaseDao implements NewsUserDao {@Overridepublic NewsUser findByUserName(String username) {// 准备SQLString sql ="select uid,username,user_pwd userPwd ,nick_name nickName from news_user where username = ?";// 调用BaseDao公共查询方法List<NewsUser> newsUserList = baseQuery(NewsUser.class, sql, username);// 如果找到,返回集合中的第一个数据(其实就一个)if (null != newsUserList && newsUserList.size()>0){return  newsUserList.get(0);}return null;}
}

3.1.2 根据token获取完整用户信息

需求描述

  • 客户端发送请求,提交token请求头,后端根据token请求头获取登录用户的详细信息并响应给客户端进行存储

uri

user/getUserInfo

请求方式

GET

请求头

token: ... ...

响应示例

  • 成功获取
{"code": 200,"message": "success","data": {"loginUser": {"uid": 1,"username": "zhangsan","userPwd": "","nickName": "张三"}}
}
  • 获取失败
{"code": 504,"message": "notLogin","data": null
}

后端代码

  • NewsUserController
package com.atguigu.headline.controller;import com.atguigu.headline.common.Result;
import com.atguigu.headline.common.ResultCodeEnum;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.service.impl.NewsUserServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.MD5Util;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
import java.util.HashMap;
import java.util.Map;@WebServlet("/user/*")
public class NewsUserController extends BaseController{private NewsUserService newsUserService =new NewsUserServiceImpl();/*** 接收token,根据token查询完整用户信息* @param req* @param resp* @throws ServletException* @throws IOException*/protected void getUserInfo(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String token = req.getHeader("token");Result  result =Result.build(null,ResultCodeEnum.NOTLOGIN);if(null!= token){if (!JwtHelper.isExpiration(token)) {Integer uid = JwtHelper.getUserId(token).intValue();NewsUser newsUser =newsUserService.findByUid(uid);newsUser.setUserPwd("");Map<String,Object> data =new HashMap<>();data.put("loginUser",newsUser);result=Result.ok(data);}}WebUtil.writeJson(resp,result);}
}
  • NewsUserService
package com.atguigu.headline.service;import com.atguigu.headline.pojo.NewsUser;public interface NewsUserService {/*** 根据用户id查询用户信息* @param uid 要查询的用户id* @return 找到返回NewsUser对象,找不到返回null*/NewsUser findByUid(Integer uid);
}
  • NewsUserServiceImpl
package com.atguigu.headline.service.impl;import com.atguigu.headline.dao.NewsUserDao;
import com.atguigu.headline.dao.impl.NewsUserDaoImpl;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsTypeService;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.util.MD5Util;public class NewsUserServiceImpl implements NewsUserService {private NewsUserDao newsUserDao =new NewsUserDaoImpl();@Overridepublic NewsUser findByUid(Integer uid) {return newsUserDao.findByUid(uid);}
}
  • NewUserDao
package com.atguigu.headline.dao;import com.atguigu.headline.pojo.NewsUser;public interface NewsUserDao {/*** 根据用户id连接数据库查询用户信息* @param uid  要查询的用户id* @return 找到返回NewsUser对象,找不到返回null*/NewsUser findByUid(Integer uid);
}
  • NewUserDaoImpl
package com.atguigu.headline.dao.impl;import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsUserDao;
import com.atguigu.headline.pojo.NewsUser;
import java.util.List;public class NewsUserDaoImpl extends BaseDao implements NewsUserDao {@Overridepublic NewsUser findByUid(Integer uid) {String sql ="select uid,username,user_pwd userPwd ,nick_name nickName from news_user where uid = ?";List<NewsUser> newsUserList = baseQuery(NewsUser.class, sql, uid);if (null != newsUserList && newsUserList.size()>0){return  newsUserList.get(0);}return null;}
}

3.1.3 注册时用户名占用校验

在这里插入图片描述

需求说明

  • 用户在注册时输入用户名时,立刻将用户名发送给后端,后端根据用户名查询用户名是否可用并做出响应

uri:

user/checkUserName

请求方式:

POST

请求参数

username=zhangsan

响应示例

  • 用户名校验通过
{"code":"200","message":"success""data":{}
}
  • 用户名占用
{"code":"505","message":"用户名占用""data":{}
}

后端代码

  • NewsUserController
package com.atguigu.headline.controller;import com.atguigu.headline.common.Result;
import com.atguigu.headline.common.ResultCodeEnum;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.service.impl.NewsUserServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.MD5Util;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
import java.util.HashMap;
import java.util.Map;@WebServlet("/user/*")
public class NewsUserController extends BaseController{private NewsUserService newsUserService =new NewsUserServiceImpl();/*** 注册时校验用户名是否被占用* @param req* @param resp* @throws ServletException* @throws IOException*/protected void checkUserName(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String username = req.getParameter("username");NewsUser newsUser = newsUserService.findByUserName(username);Result result=null;if (null == newsUser){result=Result.ok(null);}else{result=Result.build(null,ResultCodeEnum.USERNAME_USED);}WebUtil.writeJson(resp,result);}
}

3.1.4 注册表单提交

在这里插入图片描述

需求说明

  • 客户端将新用户信息发送给服务端,服务端将新用户存入数据库,存入之前做用户名是否被占用校验,校验通过响应成功提示,否则响应失败提示

uri:

user/regist

请求方式:

POST

请求参数

{"username":"zhangsan","userPwd":"123456","nickName":"张三"
}

响应示例

  • 注册成功
{"code":"200","message":"success""data":{}
}
  • 用户名占用
{"code":"505","message":"用户名占用""data":{}
}

后端代码

  • NewsUserController
package com.atguigu.headline.controller;import com.atguigu.headline.common.Result;
import com.atguigu.headline.common.ResultCodeEnum;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.service.impl.NewsUserServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.MD5Util;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;@WebServlet("/user/*")
public class NewsUserController extends BaseController{private NewsUserService newsUserService =new NewsUserServiceImpl();/*** 注册功能接口* @param req* @param resp* @throws ServletException* @throws IOException*/protected void regist(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {NewsUser newsUser = WebUtil.readJson(req, NewsUser.class);NewsUser usedUser = newsUserService.findByUserName(newsUser.getUsername());Result result=null;if (null == usedUser){newsUserService.registUser(newsUser);result=Result.ok(null);}else{result=Result.build(null,ResultCodeEnum.USERNAME_USED);}WebUtil.writeJson(resp,result);}
}
  • NewsUserService
package com.atguigu.headline.service;import com.atguigu.headline.pojo.NewsUser;public interface NewsUserService {/*** 注册用户信息,注册成功返回大于0的整数,失败返回0* @param newsUser* @return*/int registUser(NewsUser newsUser);
}
  • NewsUserServiceImpl
package com.atguigu.headline.service.impl;import com.atguigu.headline.dao.NewsUserDao;
import com.atguigu.headline.dao.impl.NewsUserDaoImpl;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsTypeService;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.util.MD5Util;public class NewsUserServiceImpl implements NewsUserService {@Overridepublic int registUser(NewsUser newsUser) {// 密码明文转密文newsUser.setUserPwd(MD5Util.encrypt(newsUser.getUserPwd()));// 存入数据库return newsUserDao.insertNewsUser(newsUser);}
}
  • NewUserDao
package com.atguigu.headline.dao;import com.atguigu.headline.pojo.NewsUser;public interface NewsUserDao {/*** 将用户信息存入数据库* @param newsUser * @return*/int insertNewsUser(NewsUser newsUser);
}
  • NewUserDaoImpl
package com.atguigu.headline.dao.impl;import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsUserDao;
import com.atguigu.headline.pojo.NewsUser;
import java.util.List;public class NewsUserDaoImpl extends BaseDao implements NewsUserDao {@Overridepublic int insertNewsUser(NewsUser newsUser) {String sql ="insert into news_user values(DEFAULT,?,?,?)";return baseUpdate(sql,newsUser.getUsername(),newsUser.getUserPwd(),newsUser.getNickName());}
}

3.2 头条首页功能

3.2.1 查询所有头条分类

在这里插入图片描述

需求说明

  • 进入新闻首页,查询所有分类并动态展示新闻类别栏位

uri:

portal/findAllTypes

请求方式

GET

请求参数

无

响应示例

{"code":"200","message":"OK""data":[{"tid":"1","tname":"新闻"},{"tid":"2","tname":"体育"},{"tid":"3","tname":"娱乐"},{"tid":"4","tname":"科技"},{"tid":"5","tname":"其他"}]}

后端代码

  • PortalController
package com.atguigu.headline.controller;import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsType;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.NewsTypeService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.service.impl.NewsTypeServiceImpl;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;@WebServlet("/portal/*")
public class PortalController extends BaseController{private NewsHeadlineService headlineService=new NewsHeadlineServiceImpl();private NewsTypeService newsTypeService=new NewsTypeServiceImpl();/*** 查询所有新闻类型* @param req* @param resp* @throws ServletException* @throws IOException*/protected void findAllTypes(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {List<NewsType> newsTypeList =newsTypeService.findAll();WebUtil.writeJson(resp,Result.ok(newsTypeList));}
}
  • NewsTypeService
package com.atguigu.headline.service;import com.atguigu.headline.pojo.NewsType;import java.util.List;public interface NewsTypeService {/*** 查询全部新闻类型* @return*/List<NewsType> findAll();
}
  • NewsTypeServiceImpl
package com.atguigu.headline.service.impl;import com.atguigu.headline.dao.NewsTypeDao;
import com.atguigu.headline.dao.impl.NewsTypeDaoImpl;
import com.atguigu.headline.pojo.NewsType;
import com.atguigu.headline.service.NewsTypeService;import java.util.List;public class NewsTypeServiceImpl implements NewsTypeService {private NewsTypeDao  newsTypeDao =new NewsTypeDaoImpl();@Overridepublic List<NewsType> findAll() {return newsTypeDao.findAll();}
}
  • NewUserDao
package com.atguigu.headline.dao;import com.atguigu.headline.pojo.NewsType;import java.util.List;public interface NewsTypeDao {/*** 从数据库中查询全部新闻类型* @return*/List<NewsType> findAll();
}
  • NewsTypeDaoImpl
package com.atguigu.headline.dao.impl;import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsTypeDao;
import com.atguigu.headline.pojo.NewsType;import java.util.List;public class NewsTypeDaoImpl extends BaseDao implements NewsTypeDao {@Overridepublic List<NewsType> findAll() {String sql ="select tid,tname from news_type";return  baseQuery(NewsType.class, sql);}
}

3.2.2 分页带条件查询所有头条

在这里插入图片描述

需求说明

  • 客户端向服务端发送查询关键字,新闻类别,页码数,页大小
  • 服务端根据条件搜索分页信息,返回含页码数,页大小,总页数,总记录数,当前页数据等信息,并根据时间降序,浏览量降序排序

uri:

portal/findNewsPage

请求方式:

POST

请求参数:

{"keyWords":"马斯克", // 搜索标题关键字"type":0,           // 新闻类型"pageNum":1,        // 页码数"pageSize":"10"     // 页大小
}

响应示例:

{"code":"200","message":"success""data":{"pageInfo":{"pageData":[                           // 本页的数据{"hid":"1",                     // 新闻id "title":"尚硅谷宣布 ... ...",   // 新闻标题"type":"1",                    // 新闻所属类别编号"pageViews":"40",              // 新闻浏览量"pastHours":"3" ,              // 发布时间已过小时数"publisher":"1"                // 发布用户ID},{"hid":"1",                     // 新闻id "title":"尚硅谷宣布 ... ...",   // 新闻标题"type":"1",                    // 新闻所属类别编号"pageViews":"40",              // 新闻浏览量"pastHours":"3",              // 发布时间已过小时数"publisher":"1"                // 发布用户ID},{"hid":"1",                     // 新闻id "title":"尚硅谷宣布 ... ...",   // 新闻标题"type":"1",                    // 新闻所属类别编号"pageViews":"40",              // 新闻浏览量"pastHours":"3",               // 发布时间已过小时数"publisher":"1"                // 发布用户ID}],"pageNum":1,    //页码数"pageSize":10,  // 页大小"totalPage":20, // 总页数"totalSize":200 // 总记录数}}
}

后端代码

  • PortalController
package com.atguigu.headline.controller;import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsType;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.NewsTypeService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.service.impl.NewsTypeServiceImpl;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;@WebServlet("/portal/*")
public class PortalController extends BaseController{private NewsHeadlineService headlineService=new NewsHeadlineServiceImpl();private NewsTypeService newsTypeService=new NewsTypeServiceImpl();/*** 分页带条件查询新闻* @param req* @param resp* @throws ServletException* @throws IOException*/protected void findNewsPage(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {HeadlineQueryVo headLineQueryVo = WebUtil.readJson(req, HeadlineQueryVo.class);// 查询分页五项数据Map<String,Object> pageInfo =headlineService.findPage(headLineQueryVo);// 将分页五项数据放入PageInfoMapMap<String,Object> pageInfoMap=new HashMap<>();pageInfoMap.put("pageInfo",pageInfo);// 响应JSONWebUtil.writeJson(resp, Result.ok(pageInfoMap));}
}
  • NewsHeadlineService
package com.atguigu.headline.service;import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.List;
import java.util.Map;public interface NewsHeadlineService {/*** 分页查询头条新闻方法* @param headLineQueryVo* @return*/Map<String, Object> findPage(HeadlineQueryVo headLineQueryVo);
}
  • NewsHeadlineServiceImpl
package com.atguigu.headline.service.impl;import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.dao.impl.NewsHeadlineDaoImpl;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;import java.util.HashMap;
import java.util.List;
import java.util.Map;public class NewsHeadlineServiceImpl  implements NewsHeadlineService {private NewsHeadLineDao newsHeadLineDao =new NewsHeadlineDaoImpl();@Overridepublic Map<String, Object> findPage(HeadlineQueryVo headLineQueryVo) {// 准备一个map,用于装分页的五项数据Map<String,Object> pageInfo =new HashMap<>();// 分页查询本页数据List<HeadlinePageVo>  pageData =newsHeadLineDao.findPageList(headLineQueryVo);// 分页查询满足记录的总数据量int totalSize = newsHeadLineDao.findPageCount(headLineQueryVo);// 页大小int pageSize =headLineQueryVo.getPageSize();// 总页码数int totalPage=totalSize%pageSize == 0 ?  totalSize/pageSize  : totalSize/pageSize+1;// 当前页码数int pageNum= headLineQueryVo.getPageNum();pageInfo.put("pageData",pageData);pageInfo.put("pageNum",pageNum);pageInfo.put("pageSize",pageSize);pageInfo.put("totalPage",totalPage);pageInfo.put("totalSize",totalSize);return pageInfo;}
}
  • NewsHeadLineDao
package com.atguigu.headline.dao;import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.List;public interface NewsHeadLineDao {/*** 根据查询条件,查询满足条件的记录数* @param headLineQueryVo* @return*/int findPageCount(HeadlineQueryVo headLineQueryVo);/*** 根据查询条件,查询当前页数据* @param headLineQueryVo* @return*/List<HeadlinePageVo> findPageList(HeadlineQueryVo headLineQueryVo);
}
  • NewsHeadlineDaoImpl
package com.atguigu.headline.dao.impl;import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.LinkedList;
import java.util.List;public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{@Overridepublic int findPageCount(HeadlineQueryVo headLineQueryVo) {//  拼接动态 SQL,拼接参数List<Object> args =new LinkedList<>();String  sql="select count(1) from news_headline where is_deleted=0 ";StringBuilder sqlBuffer =new StringBuilder(sql) ;String keyWords = headLineQueryVo.getKeyWords();//判断并动态拼接条件if (null != keyWords && keyWords.length()>0){sqlBuffer.append("and title like ? ");args.add("%"+keyWords+"%");}//  判断并动态拼接条件Integer type = headLineQueryVo.getType();if(null != type  && type != 0){sqlBuffer.append("and type  =  ? ");args.add(type);}// 参数转数组Object[] argsArr = args.toArray();System.out.println(sqlBuffer.toString());Long totalSize = baseQueryObject(Long.class, sqlBuffer.toString(), argsArr);// 返回数据return totalSize.intValue();}@Overridepublic List<HeadlinePageVo> findPageList(HeadlineQueryVo headLineQueryVo) {//  拼接动态 SQL,拼接参数List<Object> args =new LinkedList<>();String  sql="select hid,title,type,page_views pageViews,TIMESTAMPDIFF(HOUR,create_time,NOW()) pastHours,publisher from news_headline where is_deleted=0 ";StringBuilder sqlBuffer =new StringBuilder(sql) ;String keyWords = headLineQueryVo.getKeyWords();if (null != keyWords && keyWords.length()>0){sqlBuffer.append("and title like ? ");args.add("%"+keyWords+"%");}Integer type = headLineQueryVo.getType();if(null != type  && type != 0){sqlBuffer.append("and type  =  ? ");args.add(type);}sqlBuffer.append("order by pastHours , page_views desc ");sqlBuffer.append("limit ? , ?");args.add((headLineQueryVo.getPageNum()-1)*headLineQueryVo.getPageSize());args.add(headLineQueryVo.getPageSize());// 参数转数组Object[] argsArr = args.toArray();System.out.println(sqlBuffer.toString());List<HeadlinePageVo> pageData = baseQuery(HeadlinePageVo.class, sqlBuffer.toString(), argsArr);return pageData;}
}

3.2.3 查看头条详情

1684891013180

在这里插入图片描述

需求说明

  • 用户点击"查看全文"时,向服务端发送新闻id
  • 后端根据新闻id查询完整新闻文章信息并返回
  • 后端要同时让新闻的浏览量+1

uri

portal/showHeadlineDetail

请求方式

POST

请求参数

hid=1

响应示例

{"code":"200","message":"success","data":{"headline":{"hid":"1",                     // 新闻id "title":"马斯克宣布 ... ...",   // 新闻标题"article":"... ..."            // 新闻正文"type":"1",                    // 新闻所属类别编号"typeName":"科技",             // 新闻所属类别"pageViews":"40",              // 新闻浏览量"pastHours":"3" ,              // 发布时间已过小时数"publisher":"1" ,               // 发布用户ID"author":"张三"                 // 新闻作者}}
}

后端代码

  • PortalController
package com.atguigu.headline.controller;import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsType;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.NewsTypeService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.service.impl.NewsTypeServiceImpl;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;@WebServlet("/portal/*")
public class PortalController extends BaseController{private NewsHeadlineService headlineService=new NewsHeadlineServiceImpl();private NewsTypeService newsTypeService=new NewsTypeServiceImpl();/*** 查询单个新闻详情* @param req* @param resp* @throws ServletException* @throws IOException*/protected void showHeadlineDetail(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {// 获取要查询的详情新闻idInteger hid =Integer.parseInt(req.getParameter("hid"));// 查询新闻详情voHeadlineDetailVo headlineDetailVo =headlineService.findHeadlineDetail(hid);// 封装data内容Map<String ,Object> data =new HashMap<>();data.put("headline",headlineDetailVo);// 响应JSONWebUtil.writeJson(resp,Result.ok(data));}
}
  • NewsHeadlineService
package com.atguigu.headline.service;import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.List;
import java.util.Map;public interface NewsHeadlineService {/*** 根据头条id,显示头条详情* @param hid* @return*/HeadlineDetailVo findHeadlineDetail(Integer hid);
}
  • NewsHeadlineServiceImpl
package com.atguigu.headline.service.impl;import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.dao.impl.NewsHeadlineDaoImpl;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;import java.util.HashMap;
import java.util.List;
import java.util.Map;public class NewsHeadlineServiceImpl  implements NewsHeadlineService {private NewsHeadLineDao newsHeadLineDao =new NewsHeadlineDaoImpl();@Overridepublic HeadlineDetailVo findHeadlineDetail(Integer hid) {// 修改新闻信息浏览量+1newsHeadLineDao.increasePageViews(hid);// 查询新闻详情return newsHeadLineDao.findHeadlineDetail(hid);}
}
  • NewsHeadLineDao
package com.atguigu.headline.dao;import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.List;public interface NewsHeadLineDao {/*** 多表查询新闻详情* @param hid* @return*/HeadlineDetailVo findHeadlineDetail(Integer hid);int increasePageViews(Integer hid);
}
  • NewsHeadlineDaoImpl
package com.atguigu.headline.dao.impl;import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.LinkedList;
import java.util.List;public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{@Overridepublic HeadlineDetailVo findHeadlineDetail(Integer hid) {String sql ="select hid,title,article,type, tname typeName ,page_views pageViews,TIMESTAMPDIFF(HOUR,create_time,NOW()) pastHours,publisher,nick_name author from news_headline h left join  news_type t on h.type = t.tid left join news_user u  on h.publisher = u.uid where hid = ?";List<HeadlineDetailVo> headlineDetailVoList = baseQuery(HeadlineDetailVo.class, sql, hid);if(null != headlineDetailVoList && headlineDetailVoList.size()>0)return headlineDetailVoList.get(0);return null;}@Overridepublic int increasePageViews(Integer hid) {String sql ="update news_headline set page_views = page_views +1 where hid =?";return baseUpdate(sql,hid);}
}

3.3 头条发布修改和删除

3.3.1 登录校验

需求说明

  • 客户端在进入发布页前、发布新闻前、进入修改页前、修改前、删除新闻前先向服务端发送请求携带token请求头
  • 后端接收token请求头后,校验用户登录是否过期并做响应
  • 前端根据响应信息提示用户进入登录页还是进入正常业务页面

uri

user/checkLogin

请求方式

GET

请求参数

无

请求头

token: ... ...

响应示例

  • 登录未过期
{"code":"200","message":"success","data":{}
}
  • 登录已过期
{"code":"504","message":"loginExpired","data":{}
}

后端代码

  • NewsUserController
package com.atguigu.headline.controller;import com.atguigu.headline.common.Result;
import com.atguigu.headline.common.ResultCodeEnum;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.NewsUser;
import com.atguigu.headline.service.NewsUserService;
import com.atguigu.headline.service.impl.NewsUserServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.MD5Util;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
import java.util.HashMap;
import java.util.Map;@WebServlet("/user/*")
public class NewsUserController extends BaseController{private NewsUserService newsUserService =new NewsUserServiceImpl();/*** 通过token检验用户登录是否过期* @param req* @param resp* @throws ServletException* @throws IOException*/protected void checkLogin(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String token = req.getHeader("token");Result  result =Result.build(null,ResultCodeEnum.NOTLOGIN);if(null!= token){if (!JwtHelper.isExpiration(token)) {result=Result.ok(null);}}WebUtil.writeJson(resp,result);}
}
  • 登录校验过滤器
package com.atguigu.headline.filters;import com.atguigu.headline.common.Result;
import com.atguigu.headline.common.ResultCodeEnum;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;public class LoginFilter implements Filter {@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpServletRequest request =(HttpServletRequest)  servletRequest;String token = request.getHeader("token");boolean flag =false;// token不为空并且没过期if (null  != token ){boolean expiration = JwtHelper.isExpiration(token);if (!expiration ){flag=true;}}if (flag){filterChain.doFilter(servletRequest,servletResponse);}else{WebUtil.writeJson((HttpServletResponse) servletResponse, Result.build(null, ResultCodeEnum.NOTLOGIN));}}
}
  • web.xml中配置登录校验过滤器
    <!--登录校验过滤器--><filter><filter-name>loginFilter</filter-name><filter-class>com.atguigu.headline.filters.LoginFilter</filter-class></filter><filter-mapping><filter-name>loginFilter</filter-name><url-pattern>/headline/*</url-pattern></filter-mapping>

3.3.2 提交发布头条

在这里插入图片描述

需求说明

  • 用户在客户端输入发布的新闻信息完毕后
  • 发布前先请求后端的登录校验接口验证登录
  • 登录通过则提交新闻信息
  • 后端将新闻信息存入数据库

uri

headline/publish

请求方式

POST

请求头

token: ... ...

请求参数

{"title":"尚硅谷宣布 ... ...",   // 文章标题"article":"... ...",          // 文章内容"type":"1"                    // 文章类别
}

响应示例

  • 发布成功
{"code":"200","message":"success","data":{}
}
  • 失去登录状态发布失败
{"code":"504","message":"loginExpired","data":{}
}

后端代码

  • NewsHeadlineController
package com.atguigu.headline.controller;import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
import java.util.HashMap;
import java.util.Map;@WebServlet("/headline/*")
public class NewsHeadlineController extends BaseController {private NewsHeadlineService newsHeadlineService =new NewsHeadlineServiceImpl();/*** 发布新闻* @param req* @param resp* @throws ServletException* @throws IOException*/protected void publish(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {// 读取新闻信息NewsHeadline newsHeadline = WebUtil.readJson(req, NewsHeadline.class);// 通过token获取发布者IDString token = req.getHeader("token");Long userId = JwtHelper.getUserId(token);newsHeadline.setPublisher(userId.intValue());// 将新闻存入数据库newsHeadlineService.addNewsHeadline(newsHeadline);WebUtil.writeJson(resp,Result.ok(null));}
}
  • NewsHeadlineService
package com.atguigu.headline.service;import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.List;
import java.util.Map;public interface NewsHeadlineService {/*** 新增头条* @param newsHeadline* @return*/int addNewsHeadline(NewsHeadline newsHeadline);
}
  • NewsHeadlineServiceImpl
package com.atguigu.headline.service.impl;import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.dao.impl.NewsHeadlineDaoImpl;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;import java.util.HashMap;
import java.util.List;
import java.util.Map;public class NewsHeadlineServiceImpl  implements NewsHeadlineService {private NewsHeadLineDao newsHeadLineDao =new NewsHeadlineDaoImpl();public int addNewsHeadline(NewsHeadline newsHeadline) {return newsHeadLineDao.addNewsHeadline(newsHeadline);}
}
  • NewsHeadLineDao
package com.atguigu.headline.dao;import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.List;public interface NewsHeadLineDao {/*** 头条存入数据库* @param newsHeadline* @return*/int addNewsHeadline(NewsHeadline newsHeadline);
}
  • NewsHeadlineDaoImpl
package com.atguigu.headline.dao.impl;import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.LinkedList;
import java.util.List;public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{@Overridepublic int addNewsHeadline(NewsHeadline newsHeadline) {String sql = "insert into news_headline values(DEFAULT,?,?,?,?,0,NOW(),NOW(),0)";return baseUpdate(sql,newsHeadline.getTitle(),newsHeadline.getArticle(),newsHeadline.getType(),newsHeadline.getPublisher());}
}

3.3.3 修改头条回显

在这里插入图片描述

需求说明

  • 前端先调用登录校验接口,校验登录是否过期
  • 登录校验通过后 ,则根据新闻id查询新闻的完整信息并响应给前端

uri

headline/findHeadlineByHid

请求方式

POST

请求参数

hid=1

响应示例

  • 查询成功
{"code":"200","message":"success","data":{"headline":{"hid":"1","title":"马斯克宣布","article":"... ... ","type":"2"}}
}

后端代码

  • NewsHeadlineController
package com.atguigu.headline.controller;import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
import java.util.HashMap;
import java.util.Map;@WebServlet("/headline/*")
public class NewsHeadlineController extends BaseController {private NewsHeadlineService newsHeadlineService =new NewsHeadlineServiceImpl();/*** 修改新闻回显* @param req* @param resp* @throws ServletException* @throws IOException*/protected void findHeadlineByHid(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {Integer hid = Integer.parseInt(req.getParameter("hid"));NewsHeadline newsHeadline =newsHeadlineService.findHeadlineByHid(hid);Map<String ,Object> data =new HashMap<>();data.put("headline",newsHeadline);WebUtil.writeJson(resp,Result.ok(data));}
}
  • NewsHeadlineService
package com.atguigu.headline.service;import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.List;
import java.util.Map;public interface NewsHeadlineService {/*** 根据新闻id查询单个新闻* @param hid* @return*/NewsHeadline findHeadlineByHid(Integer hid);
}
  • NewsHeadlineServiceImpl
package com.atguigu.headline.service.impl;import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.dao.impl.NewsHeadlineDaoImpl;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;import java.util.HashMap;
import java.util.List;
import java.util.Map;public class NewsHeadlineServiceImpl  implements NewsHeadlineService {private NewsHeadLineDao newsHeadLineDao =new NewsHeadlineDaoImpl();@Overridepublic NewsHeadline findHeadlineByHid(Integer hid) {return newsHeadLineDao.findHeadlineByHid(hid);}
}
  • NewsHeadLineDao
package com.atguigu.headline.dao;import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.List;public interface NewsHeadLineDao {NewsHeadline findHeadlineByHid(Integer hid);
}
  • NewUserDaoImpl
package com.atguigu.headline.dao.impl;import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.LinkedList;
import java.util.List;public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{@Overridepublic NewsHeadline findHeadlineByHid(Integer hid) {String sql ="select hid,title,article,type,publisher,page_views pageViews from news_headline where hid =?";List<NewsHeadline> newsHeadlineList = baseQuery(NewsHeadline.class, sql, hid);if(null != newsHeadlineList && newsHeadlineList.size()>0)return newsHeadlineList.get(0);return null;}
}

3.3.4 保存修改

需求描述

  • 客户端将新闻信息修改后,提交前先请求登录校验接口校验登录状态
  • 登录校验通过则提交修改后的新闻信息,后端接收并更新进入数据库

uri

headline/update

请求方式

POST

请求参数

{"hid":"1","title":"尚硅谷宣布 ... ...","article":"... ...","type":"2"
}

响应示例

  • 修改成功
{"code":"200","message":"success","data":{}
}
  • 修改失败
{"code":"504","message":"loginExpired","data":{}
}

后端代码

  • NewsHeadlineController
package com.atguigu.headline.controller;import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
import java.util.HashMap;
import java.util.Map;@WebServlet("/headline/*")
public class NewsHeadlineController extends BaseController {private NewsHeadlineService newsHeadlineService =new NewsHeadlineServiceImpl();/*** 更新新闻信息* @param req* @param resp* @throws ServletException* @throws IOException*/protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {NewsHeadline newsHeadline = WebUtil.readJson(req, NewsHeadline.class);newsHeadlineService.updateNewsHeadline(newsHeadline);WebUtil.writeJson(resp,Result.ok(null));}
}
  • NewsHeadlineService
package com.atguigu.headline.service;import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.List;
import java.util.Map;public interface NewsHeadlineService {int updateNewsHeadline(NewsHeadline newsHeadline);
}
  • NewsHeadlineServiceImpl
package com.atguigu.headline.service.impl;import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.dao.impl.NewsHeadlineDaoImpl;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;import java.util.HashMap;
import java.util.List;
import java.util.Map;public class NewsHeadlineServiceImpl  implements NewsHeadlineService {private NewsHeadLineDao newsHeadLineDao =new NewsHeadlineDaoImpl();@Overridepublic int updateNewsHeadline(NewsHeadline newsHeadline) {return newsHeadLineDao.updateNewsHeadline(newsHeadline);}
}
  • NewsHeadLineDao
package com.atguigu.headline.dao;import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.List;public interface NewsHeadLineDao {int updateNewsHeadline(NewsHeadline newsHeadline);
}
  • NewUserDaoImpl
package com.atguigu.headline.dao.impl;import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.LinkedList;
import java.util.List;public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{@Overridepublic int updateNewsHeadline(NewsHeadline newsHeadline) {String sql ="update news_headline set title = ?, article= ? , type =? , update_time = NOW() where hid = ? ";return baseUpdate(sql,newsHeadline.getTitle(),newsHeadline.getArticle(),newsHeadline.getType(),newsHeadline.getHid());}
}

3.3.5 删除头条

在这里插入图片描述

需求说明

  • 将要删除的新闻id发送给服务端
  • 服务端校验登录是否过期,未过期则直接删除,过期则响应登录过期信息

uri

headline/removeByHid

请求方式

POST

请求参数

hid=1

响应示例

  • 删除成功
{"code":"200","message":"success","data":{}
}
  • 删除失败
{"code":"504","message":"loginExpired","data":{}}

后端代码

  • NewsHeadlineController
package com.atguigu.headline.controller;import com.atguigu.headline.common.Result;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.service.NewsHeadlineService;
import com.atguigu.headline.service.impl.NewsHeadlineServiceImpl;
import com.atguigu.headline.util.JwtHelper;
import com.atguigu.headline.util.WebUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
import java.util.HashMap;
import java.util.Map;@WebServlet("/headline/*")
public class NewsHeadlineController extends BaseController {private NewsHeadlineService newsHeadlineService =new NewsHeadlineServiceImpl();/*** 删除新闻* @param req* @param resp* @throws ServletException* @throws IOException*/protected void removeByHid(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {Integer hid = Integer.parseInt(req.getParameter("hid"));newsHeadlineService.removeByHid(hid);WebUtil.writeJson(resp,Result.ok(null));}
}
  • NewsHeadlineService
package com.atguigu.headline.service;import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.List;
import java.util.Map;public interface NewsHeadlineService {int removeByHid(Integer hid);
}
  • NewsHeadlineServiceImpl
package com.atguigu.headline.service.impl;import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.dao.impl.NewsHeadlineDaoImpl;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;
import com.atguigu.headline.service.NewsHeadlineService;import java.util.HashMap;
import java.util.List;
import java.util.Map;public class NewsHeadlineServiceImpl  implements NewsHeadlineService {private NewsHeadLineDao newsHeadLineDao =new NewsHeadlineDaoImpl();@Overridepublic int removeByHid(Integer hid) {return newsHeadLineDao.removeByHid(hid);}
}
  • NewsHeadLineDao
package com.atguigu.headline.dao;import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.List;public interface NewsHeadLineDao {int removeByHid(Integer hid);
}
  • NewsHeadlineDaoImpl
package com.atguigu.headline.dao.impl;import com.atguigu.headline.dao.BaseDao;
import com.atguigu.headline.dao.NewsHeadLineDao;
import com.atguigu.headline.pojo.NewsHeadline;
import com.atguigu.headline.pojo.vo.HeadlineDetailVo;
import com.atguigu.headline.pojo.vo.HeadlinePageVo;
import com.atguigu.headline.pojo.vo.HeadlineQueryVo;import java.util.LinkedList;
import java.util.List;public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadLineDao{@Overridepublic int removeByHid(Integer hid) {String sql ="update news_headline set is_deleted =1 ,  update_time =NOW() where hid = ? ";return baseUpdate(sql,hid);}

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