注册用户

接口设计

请求:
POST /register
{name: xxx,password: xxx,nickName: "蔡徐坤",signature: "我擅长唱跳rap篮球",
}
响应:
HTTP/1.1 200 OK
{ok: 1,reason: xxx
}

前端异步回调ajax函数

        register(){$.ajax({url: 'register',type: 'post',contentType: 'application/json',data: JSON.stringify({name: app.registerForm.inputUsername,password: app.registerForm.inputPassword,nickName: app.registerForm.inputNickName,signature: app.registerForm.inputSignature,}),success: function(data, status) {if (!data.ok) {alert('注册失败! ' + data.reason);return;}else {alert("恭喜你，注册成功！")}app.registerForm.showDialog = false;app.login.showLoginDialog = true;}})}

编写servlet实现注册业务逻辑

package org.example.servlet;import org.example.dao.UserDao;
import org.example.exception.AppException;
import org.example.model.User;
import org.example.util.Util;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 javax.servlet.http.HttpSession;
import java.io.IOException;
import java.sql.Timestamp;/*** Created with IntelliJ IDEA.* Description:注册* User: starry* Date: 2021 -05 -31* Time: 16:09*/@WebServlet("/register")
public class RegisterServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {req.setCharacterEncoding("UTF-8");resp.setCharacterEncoding("UTF-8");resp.setContentType("application/json");User user = new User();try {//1. 解析请求数据：根据接口文档，需要使用反序列化操作User input = Util.deserialize(req.getInputStream(),User.class);//2. 业务处理：数据库验证账号密码，如果验证通过，创建session，保存用户信息if (input.getName() == null || input.getName().equals("")) {throw new AppException("用户名为空");}if (input.getPassword() == null || input.getPassword().equals("")) {throw new AppException("密码为空");}if (input.getNickName() == null || input.getNickName().equals("")) {throw new AppException("昵称为空");}int result = UserDao.insertUser(input);user = input;//构造操作成功的正常返回数据：ok-true，业务字段user.setOk(true);}catch (Exception e) {e.printStackTrace();//构造操作失败的错误信息：ok-false，reason：错误信息user.setOk(false);//自定义异常，自己抛，为中文信息，可以给用户看if (e instanceof AppException) {    //e捕获到的异常是不是自定义异常user.setReason(e.getMessage());}else { //非自定义异常，英文信息，给前端看“未知错误”user.setReason("未知的错误，请联系管理员");}}//3. 返回响应数据：从响应对象获取输出流，打印输出到响应体body中resp.getWriter().println(Util.serialize(user));}
}

操作数据库插入新用户

    /*** 插入注册用户*/public static int insertUser(User input) {Connection connection = null;PreparedStatement statement = null;try {connection = Util.getConnection();String sql = "insert user(name,password,nickName,iconPath,signature,lastLogout) values(?,?,?,?,?,?)";statement = connection.prepareStatement(sql);statement.setString(1,input.getName());statement.setString(2,input.getPassword());statement.setString(3,input.getNickName());statement.setString(4,"");statement.setString(5,input.getSignature());Timestamp time = new Timestamp(System.currentTimeMillis());statement.setTimestamp(6,time);//将注册用户返回给前端的数据修改一下input.setIconPath("");input.setLastLogout(time);return statement.executeUpdate();}catch (Exception e) {throw new AppException("插入注册用户失败",e);}finally {Util.close(connection,statement);}}