SpringBoot集成JWT

public class JwtTokenUtil {

    //公用密钥-保存在服务端,客户端是不会知道密钥的,以防被攻击
    public static String SECRET = "ThisIsASecret";

    //生成Troke
    public static String createToken(String username) {
        //签发时间
        //Date iatDate = new Date();
        //过地时间  1分钟后过期
        //Calendar nowTime = Calendar.getInstance();
        //nowTime.add(Calendar.MINUTE, 1);
        //Date expiresDate = nowTime.getTime();
        Map<String, Object> map = new HashMap();
        map.put("alg", "HS256");
        map.put("typ", "JWT");
        String token = JWT.create()
                    .withHeader(map)
                    //.withClaim( "name","Free码生") //设置 载荷 Payload
                    //.withClaim("age","12")
                    //.withClaim( "org","测试")
                    //.withExpiresAt(expiresDate)//设置过期时间,过期时间要大于签发时间
                    //.withIssuedAt(iatDate)//设置签发时间
                    .withAudience(username) //设置 载荷 签名的观众
                    .sign(Algorithm.HMAC256(SECRET));//加密
        System.out.println("后台生成token:" + token);
        return token;
    }

    //校验TOKEN
    public static boolean verifyToken(String token) throws UnsupportedEncodingException{
        JWTVerifier verifier = JWT.require(Algorithm.HMAC256(SECRET)).build();
        try {
            verifier.verify(token);
            return true;
        } catch (Exception e){
            return false;
        }
    }

    //获取Token信息
    public static DecodedJWT getTokenInfo(String token) throws UnsupportedEncodingException{
        JWTVerifier verifier = JWT.require(Algorithm.HMAC256(SECRET)).build();
        try{
            return verifier.verify(token);
        } catch(Exception e){
            throw new RuntimeException(e);
        }
    }

}

@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface UserLoginToken {
    boolean required() default true;
}

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(authenticationInterceptor())
                .addPathPatterns("/**");    // 拦截所有请求，通过判断是否有 @LoginRequired 注解 决定是否需要登录
    }
    @Bean
    public AuthenticationInterceptor authenticationInterceptor() {
        return new AuthenticationInterceptor();
    }
}

public class AuthenticationInterceptor implements HandlerInterceptor {
    @Autowired
    UserService userService;
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object) throws Exception {
        String token = httpServletRequest.getHeader("token");// 从 http 请求头中取出 token
        // 如果不是映射到方法直接通过
        if(!(object instanceof HandlerMethod)){
            return true;
        }
        HandlerMethod handlerMethod=(HandlerMethod)object;
        Method method=handlerMethod.getMethod();
        //检查是否有passtoken注释，有则跳过认证
        if (method.isAnnotationPresent(PassToken.class)) {
            PassToken passToken = method.getAnnotation(PassToken.class);
            if (passToken.required()) {
                return true;
            }
        }
        //检查有没有需要用户权限的注解
        if (method.isAnnotationPresent(UserLoginToken.class)) {
            UserLoginToken userLoginToken = method.getAnnotation(UserLoginToken.class);
            if (userLoginToken.required()) {
                // 执行认证
                if (token == null) {
                    throw new RuntimeException("无token，请重新登录");
                }
                // 验证 token
                if(JwtTokenUtil.verifyToken(token)){
                    return true;
                }else {
                    throw new RuntimeException("401");
                }
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}

@Controller
@RequestMapping(path = "/api")
public class IndexController {

    private String prefix = "index/";

    @GetMapping("/index")
    public String index()
    {
        return prefix + "index";
    }

    @UserLoginToken
    @PostMapping("/test")
    @ResponseBody
    public Object test(){
        Map<String,Object> map = new HashMap<>();
        map.put("code","200");
        map.put("message","你已通过验证了");
        return map;
    }
}