public function __construct()
   {
       $action = request()->route()->getAction();
       $act = substr($action['controller'], strripos($action['controller'], "@") + 1);
       if (in_array($act, $this->Need)) {// 不需要登录的方法
           $this->needlogin();
       }
   }


   public function needlogin()
   {
//        if (request()->ip() == '127.0.0.1') {
//            $this->user_id = 45;
//        } else {
       $token = request()->header('token');
       //    $token='eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.MzY.UgVWUh73iVckcw_CypAlglYMQK3fA-iTFh2OWp0vQpo';
       if (empty($token) || $token == null) {
           $result['code'] = '-1';
           $result['msg'] = '请先登录';
           echo json_encode($result, JSON_UNESCAPED_UNICODE);
           exit;
       }
       $openid = json_decode(json_encode(JWT::decode($token, self::$tokenKey, ['HS256'])), true);
       if (!$openid) {
           $result['code'] = '-1';
           $result['msg'] = '数据错误';
           echo json_encode($result, JSON_UNESCAPED_UNICODE);
           exit;
       }
       $this->user_id = $openid;
       // }
   }

   /**
    * 返回成功
    */
   public function success($msg = '', $data = [])
   {
       $result = [
           'code' => 1,
           'msg' => $msg,
           'data' => $data, // 返回数据
       ];
       return response()->json($result)->setEncodingOptions(JSON_UNESCAPED_UNICODE);
   }


   /**
    * 返回失败
    */
   public function error($msg = '', $data = [])
   {
       $result = [
           'code' => 0,
           'msg' => $msg,
           'data' => $data, // 返回数据
       ];
       return response()->json($result)->setEncodingOptions(JSON_UNESCAPED_UNICODE);
   }

、、、、、、、、、、、、、、、、、、、、、

<?php

namespace App\Http\Controllers;

use \DomainException;
use \InvalidArgumentException;
use \UnexpectedValueException;
use \DateTime;

/**
* JSON Web Token implementation, based on this spec:
* https://tools.ietf.org/html/rfc7519
*
* PHP version 5
*
* @category Authentication
* @package  Authentication_JWT
* @author   Neuman Vong <neuman@twilio.com>
* @author   Anant Narayanan <anant@php.net>
* @license  http://opensource.org/licenses/BSD-3-Clause 3-clause BSD
* @link     https://github.com/firebase/php-jwt
*/
class JWT
{

   /**
    * When checking nbf, iat or expiration times,
    * we want to provide some extra leeway time to
    * account for clock skew.
    */
   public static $leeway = 0;

   /**
    * Allow the current timestamp to be specified.
    * Useful for fixing a value within unit testing.
    *
    * Will default to PHP time() value if null.
    */
   public static $timestamp = null;

   public static $supported_algs = array(
       'HS256' => array('hash_hmac', 'SHA256'),
       'HS512' => array('hash_hmac', 'SHA512'),
       'HS384' => array('hash_hmac', 'SHA384'),
       'RS256' => array('openssl', 'SHA256'),
       'RS384' => array('openssl', 'SHA384'),
       'RS512' => array('openssl', 'SHA512'),
   );

   /**
    * Decodes a JWT string into a PHP object.
    *
    * @param string $jwt The JWT
    * @param string|array $key The key, or map of keys.
    *                                      If the algorithm used is asymmetric, this is the public key
    * @param array $allowed_algs List of supported verification algorithms
    *                                      Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
    *
    * @return object The JWT's payload as a PHP object
    *
    * @throws UnexpectedValueException     Provided JWT was invalid
    * @throws SignatureInvalidException    Provided JWT was invalid because the signature verification failed
    * @throws BeforeValidException         Provided JWT is trying to be used before it's eligible as defined by 'nbf'
    * @throws BeforeValidException         Provided JWT is trying to be used before it's been created as defined by 'iat'
    * @throws ExpiredException             Provided JWT has since expired, as defined by the 'exp' claim
    *
    * @uses jsonDecode
    * @uses urlsafeB64Decode
    */
   public static function decode($jwt, $key, array $allowed_algs = array())
   {
       $timestamp = is_null(static::$timestamp) ? time() : static::$timestamp;

       if (empty($key)) {
           throw new InvalidArgumentException('Key may not be empty');
       }
       $tks = explode('.', $jwt);
       if (count($tks) != 3) {
           throw new UnexpectedValueException('Wrong number of segments');
       }
       list($headb64, $bodyb64, $cryptob64) = $tks;
       if (null === ($header = static::jsonDecode(static::urlsafeB64Decode($headb64)))) {
           throw new UnexpectedValueException('Invalid header encoding');
       }
       if (null === $payload = static::jsonDecode(static::urlsafeB64Decode($bodyb64))) {
           throw new UnexpectedValueException('Invalid claims encoding');
       }
       if (false === ($sig = static::urlsafeB64Decode($cryptob64))) {
           throw new UnexpectedValueException('Invalid signature encoding');
       }
       if (empty($header->alg)) {
           throw new UnexpectedValueException('Empty algorithm');
       }
       if (empty(static::$supported_algs[$header->alg])) {
           throw new UnexpectedValueException('Algorithm not supported');
       }
       if (!in_array($header->alg, $allowed_algs)) {
           throw new UnexpectedValueException('Algorithm not allowed');
       }
       if (is_array($key) || $key instanceof \ArrayAccess) {
           if (isset($header->kid)) {
               if (!isset($key[$header->kid])) {
                   throw new UnexpectedValueException('"kid" invalid, unable to lookup correct key');
               }
               $key = $key[$header->kid];
           } else {
               throw new UnexpectedValueException('"kid" empty, unable to lookup correct key');
           }
       }

       // Check the signature
       if (!static::verify("$headb64.$bodyb64", $sig, $key, $header->alg)) {
           throw new SignatureInvalidException('Signature verification failed');
       }

       // Check if the nbf if it is defined. This is the time that the
       // token can actually be used. If it's not yet that time, abort.
       if (isset($payload->nbf) && $payload->nbf > ($timestamp + static::$leeway)) {
           throw new BeforeValidException(
               'Cannot handle token prior to ' . date(DateTime::ISO8601, $payload->nbf)
           );
       }

       // Check that this token has been created before 'now'. This prevents
       // using tokens that have been created for later use (and haven't
       // correctly used the nbf claim).
       if (isset($payload->iat) && $payload->iat > ($timestamp + static::$leeway)) {
           throw new BeforeValidException(
               'Cannot handle token prior to ' . date(DateTime::ISO8601, $payload->iat)
           );
       }

       // Check if this token has expired.
       if (isset($payload->exp) && ($timestamp - static::$leeway) >= $payload->exp) {
           throw new ExpiredException('Expired token');
       }

       return $payload;
   }

   /**
    * Converts and signs a PHP object or array into a JWT string.
    *
    * @param object|array $payload PHP object or array
    * @param string $key The secret key.
    *                                  If the algorithm used is asymmetric, this is the private key
    * @param string $alg The signing algorithm.
    *                                  Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
    * @param mixed $keyId
    * @param array $head An array with header elements to attach
    *
    * @return string A signed JWT
    *
    * @uses jsonEncode
    * @uses urlsafeB64Encode
    */
   public static function encode($payload, $key, $alg = 'HS256', $keyId = null, $head = null)
   {
       $header = array('typ' => 'JWT', 'alg' => $alg);
       if ($keyId !== null) {
           $header['kid'] = $keyId;
       }
       if (isset($head) && is_array($head)) {
           $header = array_merge($head, $header);
       }
       $segments = array();
       $segments[] = static::urlsafeB64Encode(static::jsonEncode($header));
       $segments[] = static::urlsafeB64Encode(static::jsonEncode($payload));
       $signing_input = implode('.', $segments);

       $signature = static::sign($signing_input, $key, $alg);
       $segments[] = static::urlsafeB64Encode($signature);

       return implode('.', $segments);
   }

   /**
    * Sign a string with a given key and algorithm.
    *
    * @param string $msg The message to sign
    * @param string|resource $key The secret key
    * @param string $alg The signing algorithm.
    *                                  Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
    *
    * @return string An encrypted message
    *
    * @throws DomainException Unsupported algorithm was specified
    */
   public static function sign($msg, $key, $alg = 'HS256')
   {
       if (empty(static::$supported_algs[$alg])) {
           throw new DomainException('Algorithm not supported');
       }
       list($function, $algorithm) = static::$supported_algs[$alg];
       switch ($function) {
           case 'hash_hmac':
               return hash_hmac($algorithm, $msg, $key, true);
           case 'openssl':
               $signature = '';
               $success = openssl_sign($msg, $signature, $key, $algorithm);
               if (!$success) {
                   throw new DomainException("OpenSSL unable to sign data");
               } else {
                   return $signature;
               }
       }
   }

   /**
    * Verify a signature with the message, key and method. Not all methods
    * are symmetric, so we must have a separate verify and sign method.
    *
    * @param string $msg The original message (header and body)
    * @param string $signature The original signature
    * @param string|resource $key For HS*, a string key works. for RS*, must be a resource of an openssl public key
    * @param string $alg The algorithm
    *
    * @return bool
    *
    * @throws DomainException Invalid Algorithm or OpenSSL failure
    */
   private static function verify($msg, $signature, $key, $alg)
   {
       if (empty(static::$supported_algs[$alg])) {
           throw new DomainException('Algorithm not supported');
       }

       list($function, $algorithm) = static::$supported_algs[$alg];
       switch ($function) {
           case 'openssl':
               $success = openssl_verify($msg, $signature, $key, $algorithm);
               if ($success === 1) {
                   return true;
               } elseif ($success === 0) {
                   return false;
               }
               // returns 1 on success, 0 on failure, -1 on error.
               throw new DomainException(
                   'OpenSSL error: ' . openssl_error_string()
               );
           case 'hash_hmac':
           default:
               $hash = hash_hmac($algorithm, $msg, $key, true);
               if (function_exists('hash_equals')) {
                   return hash_equals($signature, $hash);
               }
               $len = min(static::safeStrlen($signature), static::safeStrlen($hash));

               $status = 0;
               for ($i = 0; $i < $len; $i++) {
                   $status |= (ord($signature[$i]) ^ ord($hash[$i]));
               }
               $status |= (static::safeStrlen($signature) ^ static::safeStrlen($hash));

               return ($status === 0);
       }
   }

   /**
    * Decode a JSON string into a PHP object.
    *
    * @param string $input JSON string
    *
    * @return object Object representation of JSON string
    *
    * @throws DomainException Provided string was invalid JSON
    */
   public static function jsonDecode($input)
   {
       if (version_compare(PHP_VERSION, '5.4.0', '>=') && !(defined('JSON_C_VERSION') && PHP_INT_SIZE > 4)) {
           /** In PHP >=5.4.0, json_decode() accepts an options parameter, that allows you
            * to specify that large ints (like Steam Transaction IDs) should be treated as
            * strings, rather than the PHP default behaviour of converting them to floats.
            */
           $obj = json_decode($input, false, 512, JSON_BIGINT_AS_STRING);
       } else {
           /** Not all servers will support that, however, so for older versions we must
            * manually detect large ints in the JSON string and quote them (thus converting
            *them to strings) before decoding, hence the preg_replace() call.
            */
           $max_int_length = strlen((string)PHP_INT_MAX) - 1;
           $json_without_bigints = preg_replace('/:\s*(-?\d{' . $max_int_length . ',})/', ': "$1"', $input);
           $obj = json_decode($json_without_bigints);
       }

       if (function_exists('json_last_error') && $errno = json_last_error()) {
           static::handleJsonError($errno);
       } elseif ($obj === null && $input !== 'null') {
           throw new DomainException('Null result with non-null input');
       }
       return $obj;
   }

   /**
    * Encode a PHP object into a JSON string.
    *
    * @param object|array $input A PHP object or array
    *
    * @return string JSON representation of the PHP object or array
    *
    * @throws DomainException Provided object could not be encoded to valid JSON
    */
   public static function jsonEncode($input)
   {
       $json = json_encode($input);
       if (function_exists('json_last_error') && $errno = json_last_error()) {
           static::handleJsonError($errno);
       } elseif ($json === 'null' && $input !== null) {
           throw new DomainException('Null result with non-null input');
       }
       return $json;
   }

   /**
    * Decode a string with URL-safe Base64.
    *
    * @param string $input A Base64 encoded string
    *
    * @return string A decoded string
    */
   public static function urlsafeB64Decode($input)
   {
       $remainder = strlen($input) % 4;
       if ($remainder) {
           $padlen = 4 - $remainder;
           $input .= str_repeat('=', $padlen);
       }
       return base64_decode(strtr($input, '-_', '+/'));
   }

   /**
    * Encode a string with URL-safe Base64.
    *
    * @param string $input The string you want encoded
    *
    * @return string The base64 encode of what you passed in
    */
   public static function urlsafeB64Encode($input)
   {
       return str_replace('=', '', strtr(base64_encode($input), '+/', '-_'));
   }

   /**
    * Helper method to create a JSON error.
    *
    * @param int $errno An error number from json_last_error()
    *
    * @return void
    */
   private static function handleJsonError($errno)
   {
       $messages = array(
           JSON_ERROR_DEPTH => 'Maximum stack depth exceeded',
           JSON_ERROR_STATE_MISMATCH => 'Invalid or malformed JSON',
           JSON_ERROR_CTRL_CHAR => 'Unexpected control character found',
           JSON_ERROR_SYNTAX => 'Syntax error, malformed JSON',
           JSON_ERROR_UTF8 => 'Malformed UTF-8 characters' //PHP >= 5.3.3
       );
       throw new DomainException(
           isset($messages[$errno])
               ? $messages[$errno]
               : 'Unknown JSON error: ' . $errno
       );
   }

   /**
    * Get the number of bytes in cryptographic strings.
    *
    * @param string
    *
    * @return int
    */
   private static function safeStrlen($str)
   {
       if (function_exists('mb_strlen')) {
           return mb_strlen($str, '8bit');
       }
       return strlen($str);
   }
}