code: public Date getExpirationDateFromToken(String token) {
          Date expiration;
          try {
              final Claims claims = getClaimsFromToken(token);
              return claims.getExpiration();
          } catch (Exception e) {
              log.error("get expiration Time from jwt token error : {}", e.getMessage());
              return null;
          }
      }
docs: 重token中获取token过期时间
  
  @param token 当前token
  @return token创建时间