GitHub源码地址：https://github.com/zeng-xian-guo/springboot_jwt_token.git

封装JTW生成token和校验方法

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 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);

}

}

}

新建自定义注解：@UserLoginToken

@Target({ElementType.METHOD, ElementType.TYPE})

@Retention(RetentionPolicy.RUNTIME)

public @interface UserLoginToken {

boolean required() default true;

}

关于拦截器配置：

@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 {

}

}

登录：

在Controller上登录方法不用添加@UserLoginToken自定义注解，其余获取后台数据方法加上@UserLoginToken自定义注解，目的验证token是否有效，是则返回数据，否则提示401无权限。

测试：

@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 map = new HashMap<>();

map.put("code","200");

map.put("message","你已通过验证了");

return map;

}

}

HTTP请求带上登陆成功后生成token，返回成功：

HTTP请求带上无效token或不带token，返回失败：

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