Java 使用JWT创建token 使用HMAC256进行加密

    首先要导入对应的Maven依赖

         

     对Token进行加密

  先定义两个常量
  private final static String secret = "yunhao"; // 目的是加盐，内容随意

  private JWTVerifier verifier;

  // 加密过程
  public ApiTokenResult createToken(Integer userId, String userUuid) {
      try {
          Algorithm algorithm = Algorithm.HMAC256(secret); 
          String token = JWT.create().withClaim("uid", userUuid).sign(algorithm); // 创建token
          ApiTokenResult result = new ApiTokenResult(userId.toString(), userUuid, token);
          redisTemplete.boundValueOps(userUuid).set(result, Constants.TOKEN_EXPIRES_DAY, TimeUnit.DAYS);
          return result;
      } catch (Exception exception) {
          throw new AppRuntimeException("token生成失败");
      }
  }

   // 解密过程

  public ApiTokenResult checkToken(String token) {
      if (StringUtils.isBlank(token)) {
          return null;
      }
      DecodedJWT jwt = null;
      try {
          if (verifier == null) {
              Algorithm algorithm = Algorithm.HMAC256(secret);
              verifier = JWT.require(algorithm).build(); //Reusable verifier instance
          }
          jwt = verifier.verify(token);
          String uid = jwt.getClaims().get("uid").asString(); // 获取到uuid
          ApiTokenResult result = (ApiTokenResult) redisTemplete.boundValueOps(uid).get();
          return result;
      } catch (Exception e) {
          _logger.error("checkToken error : {}", e.getLocalizedMessage());
          return null;
      }
  }

 参考网址:https://blog.csdn.net/zhangchao19890805/article/details/79191177