我在Redis上写了以下订阅者，它在内部实例化了监听器:publicclassRedisSubscriberextendsThread{StringREDISHOST="localhost";intREDISPORT=6379;privatestaticRedisSubscribersingleton=null;privateJedissub;privateKeyExpiredListenerexpireListener;publicstaticsynchronizedRedisSubscribergetSingleton(){if(singleton==null){singleton