android 仿微信demo——登录功能实现(服务端)

package com.example.controller;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.example.pojo.User;
import com.example.service.UserServiceImpl;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URLDecoder;
@WebServlet(name = "Login", value = "/Login")
public class Login extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //设置字符编码，防止中文乱码
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("UTF-8");
        //以json数据完成操作
        response.setContentType("application/json;charset=UTF-8");
        System.out.println(request.getContentType());// 得到客户端发送过来内容的类型，application/json;charset=UTF-8
        System.out.println(request.getRemoteAddr());// 得到客户端的ip地址，
        BufferedReader br = new BufferedReader(new InputStreamReader(// 使用字符流读取客户端发过来的数据
                request.getInputStream()));
        String line = null;
        StringBuffer s = new StringBuffer();//StringBuffer String的区别，如果要对数据作頻繁的修改，則用StringBuffer
        // 以一行的形式读取数据
        while ((line = br.readLine()) != null) {
            s.append(line);
        }
        // 关闭io流
        br.close();
        System.out.println(s.toString());
        //JSON：这是json解析包，IDEA是没有，要我们自己导入
        User user = JSON.parseObject(s.toString(), User.class);//是用了反射机制來完成对象的封闭
        //以utf-8解码操作
        String number = URLDecoder.decode(user.getNumber(), "utf-8");
        String password = URLDecoder.decode(user.getPassword(), "utf-8");
        System.out.println("微信号:" + number + ", 密码;" + password);
        System.out.println(user);
        // 去数据库完成用户登录功能
        UserServiceImpl us = new UserServiceImpl();
        //调用登录的方法
        User user1 = us.login(number, password);
        boolean loginInfo = false;
        if (user1 != null) {
            //登录成功
            loginInfo = true;
        }
        //将结果返回给客户端，将結果构建成json数据返回给客戶端
        JSONObject rjson = new JSONObject();
        rjson.put("json", loginInfo);
        response.getOutputStream().write(
                rjson.toString().getBytes("UTF-8"));// 向客户端发送一个带有json对象内容的响应
    }
}

    //用户登录
    User login(String number,String password);

    @Override
    public User login(String number, String password) {
        //调用dao层完成数据查询操作
        User user = ud.findByUsername(number);
        if (user != null) {
            //比较密码
            if (password.equals(user.getPassword())) {
                //登录成功
                return user;
            }
        }
        return null;
    }

    //查询用户通过微信号
    User findByUsername(String number);

    @Override
    public User findByUsername(String number) {
        //判断数据是用户名还是手机
        Pattern pattern = Pattern
                .compile("^(13[0-9]|15[0-9]|153|15[6-9]|180|18[23]|18[5-9])\\d{8}$");
        Matcher matcher = pattern.matcher(number);
        //手机sql执行语句
        if (matcher.matches()) {
            //sql
            String sql = "select * from user where phone=?";
            rs = JDBCUtil.executeQuery(sql, number);
        } else {  //用户名sql执行语句
            //sql
            String sql = "select * from user where number=?";
            rs = JDBCUtil.executeQuery(sql, number);
        }
        //判断是否查询到用户
        try {
            if (rs.next()) {
                //如果查询到用户，将用户封装到User对象中
                int id = rs.getInt("id");
                String number1 = rs.getString("number");
                String name = rs.getString("name");
                String password = rs.getString("password");
                String phone = rs.getString("phone");
                String remark = rs.getString("remark");
                //将查询到的用户封装到一个User对象中
                User user = new User();
                user.setId(id);
                user.setNumber(number1);
                user.setName(name);
                user.setPassword(password);
                user.setPhone(phone);
                user.setRemark(remark);
                System.out.println("查询到的用户" + user);
                return user;
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return null;
    }