Java实战（二）用户注册、登录接口

目录结构：

1. 创建User实体类和接口调用信息描述实体类Response

package com.yxf.demo.entity;

/**
 * 抽象用户信息
 */

public class User {
    public int id;
    public String username;
    public String password;
    public String phone;

    public User() {
    }

    public User(String username, String password, String phone) {
        this.username = username;
        this.password = password;
        this.phone = phone;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String name) {
        this.username = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", phone='" + phone + '\'' +
                '}';
    }
}

package com.yxf.demo.entity;

/**
 * 用来返回接口调用信息描述
 */

public class Response {
    String msg;
    int code;
    Boolean isTure = true;

    public Response() {
    }

    public Response(String msg, int code, Boolean isTure) {
        this.msg = msg;
        this.code = code;
        this.isTure = isTure;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public Boolean getTure() {
        return isTure;
    }

    public void setTure(Boolean ture) {
        isTure = ture;
    }
}

2.创建dao层。

package com.yxf.demo.dao;

import com.yxf.demo.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
@Mapper
public interface IUserDao {
    int addUser(User user);
    List<User> queryByName(String username);
}

3..创建userService接口，实例化接口

package com.yxf.demo.service;

import com.yxf.demo.entity.User;

import java.util.List;

/**
 * 根据业务关系，编写相关业务逻辑。
 */

public interface IUserService {
    int addUser(String username,String password,String phone);
    List<User>  queryByName(String username);
}

package com.yxf.demo.service.impl;

import com.yxf.demo.entity.User;
import com.yxf.demo.dao.IUserDao;
import com.yxf.demo.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;


@Service
public class UserServiceImpl implements IUserService {

    @Autowired
    IUserDao userDao;

    @Override
    public int addUser(String username,String password,String phone) {
        User user = new User(username, password, phone);
        int isadd = userDao.addUser(user);
        return isadd;
    }

    @Override
    public List<User> queryByName(String username){
        List<User> userList = userDao.queryByName(username);
        return userList;
    }
}

4.创建controller

package com.yxf.demo.controller;

import com.yxf.demo.entity.Response;
import com.yxf.demo.entity.User;
import com.yxf.demo.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;
import java.util.Map;


@RestController
public class UserController {
    @Autowired
    private IUserService userService;
    //注册
    @RequestMapping(value = "register",method = RequestMethod.POST)
    public Response register(@RequestBody Map<String,String> person){
        String username = person.get("username");
        String password = person.get("password");
        String phone = person.get("phone");

        if (username != null && password != null && phone != null){
            List<User> user = userService.queryByName(username);
            if(user.size() == 0){
                int isadd = userService.addUser(username,password,phone);
                if (isadd > 0){
                    return new Response("注册成功", 1, true);
                }else {
                    return new Response("注册失败", -1, false);
                }
            }else {
                return new Response("注册失败：用户名已存在",-1,false);
            }
        }else {
            return new Response("注册失败：用户名、密码、手机号不能为空",-1,false);
        }
    }

    //登录
    @RequestMapping(value = "login",method = RequestMethod.POST)
    public Response login(@RequestBody Map<String, String> person) {
        String username = person.get("username");
        String password = person.get("password");

        if(username != null && password != null){
            List<User> user = userService.queryByName(username);
            if(user.size() == 0){
                return new Response("登录失败：用户名不存在", -1, false);
            }else {
                if (user.get(0).getPassword().equals(password)){
                    return new Response("登录成功", 1, true);
                }else {
                    return new Response("登录失败：密码错误", -1, false);
                }
            }
        }else {
            return new Response("登录失败：用户名密码不能为空",-1,false);
        }
    }

}

5.创建UserMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.yxf.demo.dao.IUserDao">
    <resultMap id="BaseResultMap" type="com.yxf.demo.entity.User">
        <result column="username" jdbcType="VARCHAR" property="username" />
        <result column="password" jdbcType="VARCHAR" property="password" />
        <result column="phone" jdbcType="VARCHAR" property="phone" />
    </resultMap>

    <insert id="addUser" parameterType="com.yxf.demo.entity.User">
        INSERT INTO user(username,password,phone) VALUES(#{username},#{password},#{phone})
    </insert>

    <select id="queryByName" resultType="com.yxf.demo.entity.User">
        SELECT * FROM user WHERE username = #{username}
    </select>
</mapper>