GitHub源碼地址：https://github.com/zeng-xian-guo/springboot_jwt_token.git

封裝JTW生成token和校驗方法

public class JwtTokenUtil {

//公用密鑰-保存在服務端,客戶端是不會知道密鑰的,以防被攻擊

public static String SECRET = "ThisIsASecret";

//生成Troke

public static String createToken(String username) {

//簽發時間

//Date iatDate = new Date();

//過地時間 1分鐘后過期

//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碼生") //設置 載荷 Payload

//.withClaim("age","12")

//.withClaim( "org","測試")

//.withExpiresAt(expiresDate)//設置過期時間,過期時間要大于簽發時間

//.withIssuedAt(iatDate)//設置簽發時間

.withAudience(username) //設置 載荷 簽名的觀眾

.sign(Algorithm.HMAC256(SECRET));//加密

System.out.println("后臺生成token:" + token);

return token;

}

//校驗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;

}

}

//獲取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);

}

}

}

新建自定義注解：@UserLoginToken

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

@Retention(RetentionPolicy.RUNTIME)

public @interface UserLoginToken {

boolean required() default true;

}

關于攔截器配置：

@Configuration

public class InterceptorConfig implements WebMvcConfigurer {

@Override

public void addInterceptors(InterceptorRegistry registry) {

registry.addInterceptor(authenticationInterceptor())

.addPathPatterns("/**"); // 攔截所有請求，通過判斷是否有 @LoginRequired 注解 決定是否需要登錄

}

@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");// 從 http 請求頭中取出 token

// 如果不是映射到方法直接通過

if(!(object instanceof HandlerMethod)){

return true;

}

HandlerMethod handlerMethod=(HandlerMethod)object;

Method method=handlerMethod.getMethod();

//檢查是否有passtoken注釋，有則跳過認證

if (method.isAnnotationPresent(PassToken.class)) {

PassToken passToken = method.getAnnotation(PassToken.class);

if (passToken.required()) {

return true;

}

}

//檢查有沒有需要用戶權限的注解

if (method.isAnnotationPresent(UserLoginToken.class)) {

UserLoginToken userLoginToken = method.getAnnotation(UserLoginToken.class);

if (userLoginToken.required()) {

// 執行認證

if (token == null) {

throw new RuntimeException("無token，請重新登錄");

}

// 驗證 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 {

}

}

登錄：

在Controller上登錄方法不用添加@UserLoginToken自定義注解，其余獲取后臺數據方法加上@UserLoginToken自定義注解，目的驗證token是否有效，是則返回數據，否則提示401無權限。

測試：

@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","你已通過驗證了");

return map;

}

}

HTTP請求帶上登陸成功后生成token，返回成功：

HTTP請求帶上無效token或不帶token，返回失敗：

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