登录和退出登录

2023-05-16

1. 登录

1.1 接口说明

接口url：/login

请求方式：POST

请求参数：

参数名称	参数类型	说明
account	string	账号
password	string	密码

返回数据：

{
    "success": true,
    "code": 200,
    "msg": "success",
    "data": "token"
}

1.2 JWT

登录使用JWT技术。

jwt 可以生成一个加密的token，做为用户登录的令牌，当用户登录成功之后，发放给客户端。

请求需要登录的资源或者接口的时候，将token携带，后端验证token是否合法。

jwt 有三部分组成：A.B.C

A：Header，{“type”:“JWT”,“alg”:“HS256”} 固定

B：playload，存放信息，比如，用户id，过期时间等等，可以被解密，不能存放敏感信息

C: 签证，A和B加上秘钥加密而成，只要秘钥不丢失，可以认为是安全的。

jwt 验证，主要就是验证C部分是否合法。

依赖包:

  <dependency>
        <groupId>io.jsonwebtoken</groupId>
        <artifactId>jjwt</artifactId>
        <version>0.9.1</version>
    </dependency>

工具类:

package com.mszlu.blog.utils;

import io.jsonwebtoken.Jwt;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;

public class JWTUtils {

    private static final String jwtToken = "123456Mszlu!@#$$";

    public static String createToken(Long userId){
        Map<String,Object> claims = new HashMap<>();
        claims.put("userId",userId);
        JwtBuilder jwtBuilder = Jwts.builder()
                .signWith(SignatureAlgorithm.HS256, jwtToken) // 签发算法，秘钥为jwtToken
                .setClaims(claims) // body数据，要唯一，自行设置
                .setIssuedAt(new Date()) // 设置签发时间
                .setExpiration(new Date(System.currentTimeMillis() + 24 * 60 * 60 * 60 * 1000));// 一天的有效时间
        String token = jwtBuilder.compact();
        return token;
    }

    public static Map<String, Object> checkToken(String token){
        try {
            Jwt parse = Jwts.parser().setSigningKey(jwtToken).parse(token);
            return (Map<String, Object>) parse.getBody();
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;

    }

}

1.3 Controller

package com.mszlu.blog.controller;

import com.mszlu.blog.service.LoginService;
import com.mszlu.blog.vo.Result;
import com.mszlu.blog.vo.params.LoginParam;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("login")
public class LoginController {

    @Autowired
    private LoginService loginService;

    @PostMapping
    public Result login(@RequestBody LoginParam loginParam){

        return loginService.login(loginParam);
    }
}

1.4 Service

package com.mszlu.blog.service;

import com.mszlu.blog.vo.Result;
import com.mszlu.blog.vo.params.LoginParam;

public interface LoginService {
    /**
     * 登录
     * @param loginParam
     * @return
     */
    Result login(LoginParam loginParam);
}

md5加密的依赖包：

  <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
    </dependency>

package com.mszlu.blog.service.impl;

import com.alibaba.fastjson.JSON;
import com.mszlu.blog.dao.pojo.SysUser;
import com.mszlu.blog.service.LoginService;
import com.mszlu.blog.service.SysUserService;
import com.mszlu.blog.utils.JWTUtils;
import com.mszlu.blog.vo.ErrorCode;
import com.mszlu.blog.vo.Result;
import com.mszlu.blog.vo.params.LoginParam;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

@Service
public class LoginServiceImpl implements LoginService {

    private static final String slat = "mszlu!@#";
    @Autowired
    private SysUserService sysUserService;

    @Autowired
    private RedisTemplate<String, String> redisTemplate;

    @Override
    public Result login(LoginParam loginParam) {
        String account = loginParam.getAccount();
        String password = loginParam.getPassword();
        if (StringUtils.isBlank(account) || StringUtils.isBlank(password)){
            return Result.fail(ErrorCode.PARAMS_ERROR.getCode(),ErrorCode.PARAMS_ERROR.getMsg());
        }
        String pwd = DigestUtils.md5Hex(password + slat);
        SysUser sysUser = sysUserService.findUser(account,pwd);
        if (sysUser == null){
            return Result.fail(ErrorCode.ACCOUNT_PWD_NOT_EXIST.getCode(),ErrorCode.ACCOUNT_PWD_NOT_EXIST.getMsg());
        }
        //登录成功，使用JWT生成token，返回token和redis中
        String token = JWTUtils.createToken(sysUser.getId());
        redisTemplate.opsForValue().set("TOKEN_"+token, JSON.toJSONString(sysUser),1, TimeUnit.DAYS);
        return Result.success(token);
    }

    public static void main(String[] args) {
        System.out.println(DigestUtils.md5Hex("admin"+slat));
    }
}

   @Override
    public SysUser findUser(String account, String pwd) {
        LambdaQueryWrapper<SysUser> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SysUser::getAccount,account);
        queryWrapper.eq(SysUser::getPassword,pwd);
        queryWrapper.select(SysUser::getId,SysUser::getAccount,SysUser::getAvatar,SysUser::getNickname);
        queryWrapper.last("limit 1");
        SysUser sysUser = sysUserMapper.selectOne(queryWrapper);
        return sysUser;
    }

    SysUser findUser(String account, String pwd);

1.5 登录参数，redis配置，统一错误码

package com.mszlu.blog.vo.params;

import lombok.Data;

@Data
public class LoginParam {

    private String account;

    private String password;
}

spring.redis.host=localhost
spring.redis.port=6379

package com.mszlu.blog.vo;

public enum  ErrorCode {

    PARAMS_ERROR(10001,"参数有误"),
    ACCOUNT_PWD_NOT_EXIST(10002,"用户名或密码不存在"),
    NO_PERMISSION(70001,"无访问权限"),
    SESSION_TIME_OUT(90001,"会话超时"),
    NO_LOGIN(90002,"未登录"),;

    private int code;
    private String msg;

    ErrorCode(int code, String msg){
        this.code = code;
        this.msg = msg;
    }

    public int getCode() {
        return code;
    }

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

    public String getMsg() {
        return msg;
    }

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

1.6 测试

使用postman测试，因为登录后，需要跳转页面，进行token认证，有接口未写，前端会出现问题。

token前端获取到之后，会存储在 storage中 h5 ，本地存储
在这里插入图片描述

在这里插入图片描述

2. 获取用户信息

2.1 接口说明

接口url：/users/currentUser

请求方式：GET

请求参数：

参数名称	参数类型	说明
Authorization	string	头部信息(TOKEN)

返回数据：

{
    "success": true,
    "code": 200,
    "msg": "success",
    "data": {
        "id":1,
        "account":"1",
        "nickaname":"1",
        "avatar":"ss"
    }
}

2.2 Controller

package com.mszlu.blog.controller;

import com.mszlu.blog.service.SysUserService;
import com.mszlu.blog.vo.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("users")
public class UserController {

    @Autowired
    private SysUserService sysUserService;

    @GetMapping("currentUser")
    public Result currentUser(@RequestHeader("Authorization") String token){

        return sysUserService.getUserInfoByToken(token);
    }
}

2.3 Service

 Result getUserInfoByToken(String token);

 	
@Override
    public Result getUserInfoByToken(String token) {
        Map<String, Object> map = JWTUtils.checkToken(token);
        if (map == null){
            return Result.fail(ErrorCode.NO_LOGIN.getCode(),ErrorCode.NO_LOGIN.getMsg());
        }
        String userJson = redisTemplate.opsForValue().get("TOKEN_" + token);
        if (StringUtils.isBlank(userJson)){
            return Result.fail(ErrorCode.NO_LOGIN.getCode(),ErrorCode.NO_LOGIN.getMsg());
        }
        SysUser sysUser = JSON.parseObject(userJson, SysUser.class);
        LoginUserVo loginUserVo = new LoginUserVo();
        loginUserVo.setAccount(sysUser.getAccount());
        loginUserVo.setAvatar(sysUser.getAvatar());
        loginUserVo.setId(sysUser.getId());
        loginUserVo.setNickname(sysUser.getNickname());
        return Result.success(loginUserVo);
    }

2.4 LoginUserVo

package com.mszlu.blog.vo;

import lombok.Data;

@Data
public class LoginUserVo {

    private Long id;

    private String account;

    private String nickname;

    private String avatar;
}

2.5 测试

3. 退出登录

3.1 接口说明

接口url：/logout

请求方式：GET

请求参数：

参数名称	参数类型	说明
Authorization	string	头部信息(TOKEN)

返回数据：

{
    "success": true,
    "code": 200,
    "msg": "success",
    "data": null
}

3.2 Controller

package com.mszlu.blog.controller;

import com.mszlu.blog.service.LoginService;
import com.mszlu.blog.vo.Result;
import com.mszlu.blog.vo.params.LoginParam;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("logout")
public class LogoutController {

    @Autowired
    private LoginService loginService;

    @GetMapping
    public Result logout(@RequestHeader("Authorization") String token){
        return loginService.logout(token);
    }
}

3.3 Service

  @Override
    public Result logout(String token) {
        redisTemplate.delete("TOKEN_"+token);
        return Result.success(null);
    }

3.4 测试

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