添加中间件，处理多个前端来的请求时，如果token需要刷新，先查看缓存，如果没有就在redis中做个标志位进行短期缓存，其他的请求发现缓存中的token，就不再刷新token了。这样就避免了重复刷新token的问题。
中间件代码
<?phpnamespace App\Http\Middleware;use Closure;use JWTAuth;use Tymon\JWTAuth\Exceptions\JWTException;use Tymon\JWTAuth\Exceptions\TokenExpiredException;use Tymon\JWTAuth\Exceptions\TokenInvalidException;use Illuminate\Support\Facades\Redis;class GetUserFromToken{public function handle($request, Closure $next){$newToken = null;$auth = JWTAuth::parseToken();if (! $token = $auth->setRequest($request)->getToken()) {return response()->json(['code' => '2','msg' => '无参数token','data' => '',]);}try {$user = $auth->authenticate($token);if (! $user) {return response()->json(['code' => '2','msg' => '未查询到该用户信息','data' => '',]);}$request->headers->set('Authorization','Bearer '.$token);} catch (TokenExpiredException $e) {try {sleep(rand(1,5)/100);$newToken = JWTAuth::refresh($token);$request->headers->set('Authorization','Bearer '.$newToken); // 给当前的请求设置性的token,以备在本次请求中需要调用用户信息// 将旧token存储在redis中,30秒内再次请求是有效的Redis::setex('token_blacklist:'.$token,30,$newToken);} catch (JWTException $e) {// 在黑名单的有效期,放行if($newToken = Redis::get('token_blacklist:'.$token)){$request->headers->set('Authorization','Bearer '.$newToken); // 给当前的请求设置性的token,以备在本次请求中需要调用用户信息return $next($request);}// 过期用户return response()->json(['code' => '2','msg' => '账号信息过期了，请重新登录',]);}} catch (JWTException $e) {return response()->json(['code' => '2','msg' => '无效token','data' => '',]);}$response = $next($request);if ($newToken) {$response->headers->set('Authorization', 'Bearer '.$newToken);}return $response;}}
