SpringBoot整合JWT

什么是JWT：https://www.jianshu.com/p/576dbf44b2ae

一、导入依赖

<dependency>
    <groupId>com.auth0groupId>
    <artifactId>java-jwtartifactId>
    <version>3.19.2version>
dependency>
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二、生成JWT

@Component
@Slf4j
public class TokenUtils {

    private static UserService staticUserService;

    @Autowired
    private UserService userService;

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

	// 重点 生成token
    public static  String genToken(String userId, String sign) {
        return JWT.create()
                .withAudience(userId)   // 载荷
                .withExpiresAt(DateUtil.offsetMinute(new Date(), 10))   // 10分钟后token过期
                .sign(Algorithm.HMAC256(sign)); // 以password作为token密钥
    }

    // 根据载荷中的id获取当前用户信息 
    public static User getCurrentUser() {
        User user = null;
        try {
            HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
            String token = request.getHeader("token");
            if (StrUtil.isNotBlank(token)) {
                String userId = JWT.decode(token).getAudience().get(0);
                user = staticUserService.getById((Integer.valueOf(userId)));
            }
        } catch (JWTDecodeException | NumberFormatException e) {
            log.error(e.toString());
        }
        return user;
    }
}
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在登录的接口中调用该方法，将生成的token返回给前端

@Override
public UserDTO login(UserDTO userDTO) {
    QueryWrapper<User> wrapper = new QueryWrapper<>();
    wrapper.eq("ds_user_name", userDTO.getUsername())
            .eq("ds_user_password", userDTO.getPassword());
    User user = null;
    try {
        user = getOne(wrapper);
        if (user != null) {
            userDTO.setUsername(user.getDsUserName());
            String token = TokenUtils.genToken(user.getDsUserId().toString(), user.getDsUserPassword());
            userDTO.setToken(token );
            userDTO.setPassword(null);
        } else {
            userDTO = null;
        }
    } catch (Exception e) {
        log.error(e.toString());
        userDTO = null;
    }
    return userDTO;
}
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三、前端接收token

将传回的token存放在浏览器中：

this.api.userApi.signIn(this.user)
        .then(res => {
          if (res.code === '200') {
            localStorage.setItem('user', JSON.stringify(res.data))
            this.$router.push("/home")
            this.$message.success('登录成功！')
          }
        })
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并在request.js中加上这一段，让每个请求都带上token

request.interceptors.request.use(config => {
    config.headers['Content-Type'] = 'application/json;charset=utf-8';
    let user = JSON.parse(localStorage.getItem('user'))
    if (user) config.headers['token'] = user.token;  // 设置请求头
    return config
}, error => {
    return Promise.reject(error)
});
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四、后端验证token

因为每个请求头中都包含当前用户的token，所以我们可以做一个拦截器，让非法请求无法获得数据：

实现HandlerInterceptor接口

@Component
@Slf4j
public class JwtInterceptor implements HandlerInterceptor {
    @Autowired
    UserService userService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("token");
        // 检查方法是否需要过滤
        if (!(handler instanceof HandlerMethod)) return true;

        // 初步验证token
        if (StrUtil.isBlank(token)) {
            log.error("不要乱搞");
            return false;
        }
        String userId;
        try {
            userId = JWT.decode(token).getAudience().get(0);
            // 查看是否有该用户
            User user = userService.getById(Integer.valueOf(userId));
            if (user == null) {
                log.error("不要乱搞");
                return false;
            } else {
                // 验证签证
                JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(user.getDsUserPassword())).build();
                jwtVerifier.verify(token);
            }
        } catch (JWTDecodeException e) {
            e.printStackTrace();
            log.error(e.toString());
        }
        return true;
    }
}
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五、配置拦截器

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    @Autowired
    JwtInterceptor jwtInterceptor;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(jwtInterceptor)
                .addPathPatterns("/**")
                // 不能直接 **/login必须加 /
                .excludePathPatterns("/**/login", "swagger/**", "/swagger-ui.html", "swagger-ui.html", "/webjars/**", "/swagger-ui.html/*", "/swagger-resources", "/swagger-resources/**");
    }
}
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