一、集成jwt

JWT依赖

 <!-- JWT -->
 <dependency>
     <groupId>com.auth0</groupId>
     <artifactId>java-jwt</artifactId>
     <version>3.10.3</version>
 </dependency>

UserDto

import cn.hutool.core.annotation.Alias;
import lombok.Data;

@Data
public class UserDto {

    private String username;

    private String password;

    @Alias("nickname")
    private String nickname;

    private String avatarUrl;

    private String token;
}

UserServiceImpl

@Override
    public UserDto login(UserDto userDto) {
        User one = getUserInfo(userDto);
        if (one != null){
            BeanUtil.copyProperties(one,userDto,true);
            //设置token
            String token = TokenUtils.getToken(one.getId().toString(), one.getPassword());
            userDto.setToken(token);
            return userDto;
        }else {
            throw new ServiceException(Constants.CODE_600,"用户名或密码错误");
        }
    }

TokenUtils

生成token

import cn.hutool.core.date.DateUtil;

import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;

import java.util.Date;

public class TokenUtils {

    /**
     * 生成Token
     * @return
     * */
    public static String getToken(String userId,String sign){
        return JWT.create().withAudience(userId) // 将 user id 保存到 token 里面 作为载荷
                .withExpiresAt(DateUtil.offsetHour(new Date(),2)) //两小时后token过期
                .sign(Algorithm.HMAC256(sign)); // 以 sign 作为 token 的密钥

    }
}

request.js

放开请求头,并从浏览器获取user对象

//从浏览器中获取user
    let user = localStorage.getItem("user")?JSON.parse(localStorage.getItem("user")):{}
    if (user){
        config.headers['token'] = user.token;  // 设置请求头
    }

JwtInterceptor

Token验证

import cn.hutool.core.util.StrUtil;
import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.example.springboot.common.Constants;
import com.example.springboot.entity.User;
import com.example.springboot.exception.ServiceException;
import com.example.springboot.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class JwtInterceptor implements HandlerInterceptor {

    @Autowired
    private UserService userService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        String token = request.getHeader("token");
        //如果不是映射方法，直接通过
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }
        if (StrUtil.isBlank(token)) {
            throw new ServiceException(Constants.CODE_401, "无token,请重新登录");
        }
        //获取token中的userid
        String userId;
        try {
            userId = JWT.decode(token).getAudience().get(0);
        } catch (JWTDecodeException j) {
            throw new ServiceException(Constants.CODE_401, "token验证失败");
        }
        //根据token中的userid查询数据库
        User user = userService.getById(userId);
        if (user == null) {
            throw new ServiceException(Constants.CODE_401, "用户不存在，请重新登录");
        }
        //验证token
        JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(user.getPassword())).build();
        try {
            jwtVerifier.verify(token);
        } catch (JWTVerificationException e) {
            throw new ServiceException(Constants.CODE_401, "token验证失败，请重新登录");
        }
        return true;
    }
}

InterceptorConfig 
拦截器

import com.example.springboot.config.interceptor.JwtInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(jwtInterceptor())
                //拦截所有请求通过判断token是否合法来决定是否需要登录
                .addPathPatterns("/**")
                //放行
                .excludePathPatterns("/user/login","/user/register","/**/export","/**/import");
    }

    @Bean
    public JwtInterceptor jwtInterceptor(){
        return new JwtInterceptor();
    }
}

request.js

加入token验证信息提示

//当权限验证不通过时提示
        if (res.code === '401'){
            ElementUI.Message({
                message:res.msg,
                type:"error"
            })
        }
        return res;
    },

二、获取用户对象信息

TokenUtils

    public static UserService staticUserService;


    @Resource
    private UserService userService;

    @PostConstruct
    public void setUserService() {
        staticUserService = userService;
    }



 /**
     * 获取当前登录的用户信息
     *
     * @return
     */
    public static User getCurrentUser() {
        try {
            HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
            String token = request.getHeader("token");
            if (StrUtil.isNotBlank(token)) {
                String userId = JWT.decode(token).getAudience().get(0);
                return staticUserService.getById(Integer.valueOf(userId));
            }
        } catch (Exception e) {
            return null;
        }
        return null;
    }

UserController

//分页查询 mybatis-plus方式
    @GetMapping("/selectPage")
    public Result selectPage(@RequestParam(defaultValue = "") String username,
                             @RequestParam Integer pageSize,
                             @RequestParam Integer pageNum,
                             @RequestParam(defaultValue = "") String email,
                             @RequestParam(defaultValue = "") String address) {

        IPage<User> page = new Page<>(pageNum, pageSize);
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.orderByDesc("id");
        if (!"".equals(username)) {
            queryWrapper.like("username", username);
        }
        if (!"".equals(email)) {
            queryWrapper.like("email", email);

        }
        if (!"".equals(address)) {
            queryWrapper.like("address", address);
        }
        //获取当前用户信息
        User currentUser = TokenUtils.getCurrentUser();
        System.out.println("获取当前用户信息============" + currentUser.getNickname());
        return success(userService.page(page, queryWrapper));
    }