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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 {
       @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       }    @Override    protected 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);        }    }

实现效果

哪一栏没写会提醒 ：注册失败+原因

项目发布地址

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