Java实现Redis的消息订阅和发布

1.  首先需要一个消息监听器类

package com.sogou.baike.testimport.testSubscribe;    import redis.clients.jedis.JedisPubSub;    /**   * Created by denglinjie on 2016/6/29.   */  public class RedisMsgPubSubListener extends JedisPubSub {      @Override      public void unsubscribe() {          super.unsubscribe();      }        @Override      public void unsubscribe(String... channels) {          super.unsubscribe(channels);      }        @Override      public void subscribe(String... channels) {          super.subscribe(channels);      }        @Override      public void psubscribe(String... patterns) {          super.psubscribe(patterns);      }        @Override      public void punsubscribe() {          super.punsubscribe();      }        @Override      public void punsubscribe(String... patterns) {          super.punsubscribe(patterns);      }        @Override      public void onMessage(String channel, String message) {          System.out.println("channel:" + channel + "receives message :" + message);          this.unsubscribe();      }        @Override      public void onPMessage(String pattern, String channel, String message) {        }        @Override      public void onSubscribe(String channel, int subscribedChannels) {          System.out.println("channel:" + channel + "is been subscribed:" + subscribedChannels);      }        @Override      public void onPUnsubscribe(String pattern, int subscribedChannels) {        }        @Override      public void onPSubscribe(String pattern, int subscribedChannels) {        }        @Override      public void onUnsubscribe(String channel, int subscribedChannels) {          System.out.println("channel:" + channel + "is been unsubscribed:" + subscribedChannels);      }  }  

该类需要继承JedisPubSub ，并实现其抽象方法，通过方法的名称很清楚的看出来，这个监听器是用来订阅一个频道，在订阅该频道，取消订阅，收到消息等状态会对应调用相关的方法

2.  订阅测试类

public class TestSubscribe {      @Test      public void testSubscribe() throws Exception{          Jedis jedis = new Jedis("localhost");          RedisMsgPubSubListener listener = new RedisMsgPubSubListener();          jedis.subscribe(listener, "redisChatTest");          //other code      }  }  

注意：subscribe是一个阻塞的方法，在取消订阅该频道前，会一直阻塞在这，只有当取消了订阅才会执行下面的other code，参考上面代码，我在onMessage里面收到消息后，调用了this.unsubscribe(); 来取消订阅，这样才会执行后面的other code

3.  发布消息测试类

Public class TestPublish {      @Test      public void testPublish() throws Exception{          Jedis jedis = new Jedis("localhost");          jedis.publish("redisChatTest", "我是天才");          Thread.sleep(5000);          jedis.publish("redisChatTest", "我牛逼");          Thread.sleep(5000);          jedis.publish("redisChatTest", "哈哈");      }  }  

这个类向频道redisChatTest发布消息，第二步因为订阅了该频道，所以会收到该消息。