目录
需求与设计
基础需求:
项目结构:
项目逻辑:
运行图示:
代码实现
Login.jsp
InsertServlet
SelectServlet
Table.jsp
user
mysql表结构
Web开发技术迭代速度日新月异,对于技术的更新往往是基于底层一步步封装简化,因此掌握一些基础的传统的开发技术还是有必要的。传统的JavaWeb开发通常使用Java Servlet、JavaServer Pages(JSP)、JavaBeans等技术来开发Web应用程序。
需求与设计
基础需求:
要求用户从前台界面输入基本信息,并且做基础的校验,验证无误后将数据插入数据库,再从数据库中查询所有的数据,最后再呈现到前台页面。
项目结构:
项目逻辑:
- 用户登录注册页面Login.jsp,登陆时密码不一致则会提示
- 用户登录成功后会将数据提交至InsertServelt,并且插入到数据库中
- 插入完成后,跳转至SelectServelt,查询该数据库中全部字段信息,并且将结构封装返回给前台页面Table.jsp
- 前台页面拿到数据后进行遍历渲染
运行图示:
在数据库查询数据后再返回给前端JSP,通过表格的方式呈现数据
代码实现
Login.jsp
包含了基础的注册功能和密码校验功能,通过简单的CSS样式美化了页面。
<%@ page import="java.util.Enumeration" %>
<%--登录注册页面,登陆时密码不一致则会提示用户登录成功后会将数据提交至InsertServelt,并且插入到数据库中插入完成后,跳转至SelectServelt,查询该数据库中全部字段信息,最终返回到Table.jsp中
--%>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head><meta charset="UTF-8"><title>注册</title><style>body {font-family: Arial, sans-serif;margin: 0;padding: 0;background-color: #f7f7f7;}h2 {text-align: center;margin-top: 20px;color: #333;}.container {width: 50%;margin: 20px auto;background-color: #fff;padding: 20px;box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);}form {margin-top: 20px;}table {width: 100%;}td {padding: 5px;}.txtBox {padding: 5px;width: 100%;font-size: 16px;}input[type="submit"], input[type="reset"] {padding: 5px 10px;background-color: #4CAF50;color: white;border: none;border-radius: 3px;cursor: pointer;}input[type="submit"]:hover, input[type="reset"]:hover {background-color: #45a049;}</style><script>function validateForm() {var password = document.getElementById('password').value;var confirmPassword = document.getElementById('repassword').value;if (password !== confirmPassword) {document.getElementById('repasswordError').innerText = '密码不一致';return false;} else {document.getElementById('repasswordError').innerText = '';return true;}}</script>
</head>
<body>
<%// 检查 application 中是否已经存在计数器属性Integer count = (Integer) application.getAttribute("visitCount");if (count == null) {count = 0;}// 增加访问次数count++;application.setAttribute("visitCount", count);
%>
<h2>本网站访问次数: <%= count - 1%></h2>
<div class="container"><h3>请输入注册信息</h3><form name="form1" method="post" action="InsertServlet" onsubmit="return validateForm()"><table><tr><td>用户姓名:</td><td><input type="text" name="username" value="" class="txtBox"/></td></tr><tr><td>用户密码:</td><td><input type="password" id="password" name="password" value="" class="txtBox"/></td></tr><tr><td>确认用户密码:</td><td><input type="password" id="repassword" name="repassword" value="" class="txtBox"/></td><td><span id="repasswordError" style="color: red;"></span></td></tr><tr><td>备注信息:</td><td><input type="text" name="information" value="Hello,This is user" class="txtBox"/></td></tr><tr><td>兴趣爱好:</td><td><input type="checkbox" name="hobby" value="Java"/>Java<input type="checkbox" name="hobby" value="Cpp"/>Cpp<input type="checkbox" name="hobby" value="Python"/>Python<input type="checkbox" name="hobby" value="Golang"/>Golang</td></tr><!-- 以下是提交、取消按钮 --><tr><td><input type="submit" value="注册用户"/></td><td><input type="reset" value="取消"/></td></tr></table></form>
</div>
</body>
</html>
InsertServlet
主要通过JDBC实现用户信息的插入。
import com.mysql.cj.jdbc.Driver;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;/*** @Author Luming* @Date 2024/5/15 13:56* @Description:*/
@WebServlet("/InsertServlet")
public class InsertServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {String url = "jdbc:mysql://127.0.0.1:3306/WebTest";String user = "root";//数据库名String passwd = "123456";//登录数据库密码String username = request.getParameter("username");String password = request.getParameter("password");String information = request.getParameter("information");String[] hobbies = request.getParameterValues("hobby");String hobby = String.join(",", hobbies); // 使用逗号作为分隔符try {// 加载JDBC驱动程序Class.forName("com.mysql.jdbc.Driver");//1、注册驱动Driver driver = new com.mysql.jdbc.Driver();DriverManager.registerDriver(driver);//2.获取连接Connection connection = DriverManager.getConnection(url, user, passwd);//3、获取数据库操作对象Statement statement = connection.createStatement();//4.sql语句String sql = "insert into user_info (username, password, information, hobby) " +"VALUES ('" + username + "', '" + password + "', '" + information + "', '" + hobby + "')";//5.执行sql语句后的结果int count = statement.executeUpdate(sql);} catch (SQLException | ClassNotFoundException e) {throw new RuntimeException(e);}request.getRequestDispatcher("SelectServlet").forward(request,response);}
}
SelectServlet
主要通过JDBC实现了数据的查询,再将结构遍历封装,转发给前台页面
import Pojo.User;
import com.mysql.cj.jdbc.Driver;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;/*** @Author Luming* @Date 2024/5/15 20:01* @Description:*/
@WebServlet("/SelectServlet")
public class SelectServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {String url = "jdbc:mysql://127.0.0.1:3306/WebTest";String user = "root";//数据库名String passwd = "123456";//登录数据库密码try {// 加载JDBC驱动程序Class.forName("com.mysql.jdbc.Driver");//1、注册驱动Driver driver = new com.mysql.jdbc.Driver();DriverManager.registerDriver(driver);//2.获取连接Connection connection = DriverManager.getConnection(url, user, passwd);//3、获取数据库操作对象Statement statement = connection.createStatement();//4.sql语句String sql = "select * from user_info";//5.执行sql语句后的结果ResultSet resultSet = statement.executeQuery(sql);//6.封装List<User> userList = new ArrayList<>();while (resultSet.next()) {User userTemp = new User();userTemp.setId(resultSet.getInt("id"));userTemp.setUsername(resultSet.getString("username"));userTemp.setPassword(resultSet.getString("password"));userTemp.setInformation(resultSet.getString("information"));userTemp.setHobby(resultSet.getString("hobby"));userList.add(userTemp);}// 将 userList 存储到 request 中,方便在 JSP 中使用request.setAttribute("userList", userList);} catch (SQLException e) {throw new RuntimeException(e);} catch (ClassNotFoundException e) {throw new RuntimeException(e);}request.getRequestDispatcher("Table.jsp").forward(request,response);}
}
Table.jsp
遍历展示数据库信息
<%@ page import="Pojo.User" %>
<%@ page import="java.util.List" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>表格</title><style>body {font-family: Arial, sans-serif;background-color: #f7f7f7;margin: 0;padding: 0;}h1 {text-align: center;margin-top: 20px;color: #333;}table {width: 80%;margin: 20px auto;border-collapse: collapse;background-color: #fff;box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);}th, td {border: 1px solid #ddd;padding: 10px;text-align: left;}th {background-color: #f2f2f2;font-weight: bold;}tr:nth-child(even) {background-color: #f9f9f9;}tr:hover {background-color: #f1f1f1;}.button-container {text-align: center;margin-top: 20px;}.button {padding: 10px 20px;background-color: #4CAF50;color: white;border: none;border-radius: 5px;cursor: pointer;margin-right: 10px;}.button:hover {background-color: #45a049;}</style>
</head>
<body>
<h1>用户信息表</h1>
<table><tr><th>ID</th><th>用户名</th><th>密码</th><th>备注信息</th><th>兴趣爱好</th></tr><%List<User> userList = (List<User>) request.getAttribute("userList");for (User user : userList) {out.println("<tr>");out.println("<td>" + user.getId() + "</td>");out.println("<td>" + user.getUsername() + "</td>");out.println("<td>" + user.getPassword() + "</td>");out.println("<td>" + user.getInformation() + "</td>");out.println("<td>" + user.getHobby() + "</td>");out.println("</tr>");}%>
</table>
</body>
</html>
user
用户实体类,用来封装查询后的数据,这里使用了lombok注解,如果不使用lombok的注解的话,需要自己手动去设置每个字段的set和get方法,以及无参构造方法和全参构造方法。
package Pojo;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;/*** @Author Luming* @Date 2024/5/15 20:17* @Description:*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {private int id;private String username;private String password;private String information;private String hobby;
}
mysql表结构
CREATE TABLE `user_info` (`id` int NOT NULL AUTO_INCREMENT,`username` varchar(255) NOT NULL,`password` varchar(255) NOT NULL,`information` varchar(255) DEFAULT NULL,`hobby` varchar(255) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=20 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
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