Java實現Redis的訊息訂閱和發布__Java

1.  首先需要一個訊息監聽器類

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);    }}

該類需要繼承 JedisPubSub ，並實現其抽象方法，通過方法的名稱很清楚的看出來，這個監聽器是用來訂閱一個頻道，在訂閱該頻道，取消訂閱，收到訊息等狀態會對應調用相關的方法

2.  訂閱測試類別

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

該類實現對頻道redisChatTest的訂閱監聽，頻道的訂閱，取消訂閱，收到訊息都會調用listener對象的對應方法

注意：subscribe是一個阻塞的方法，在取消訂閱該頻道前，會一直阻塞在這，只有當取消了訂閱才會執行下面的other code，參考上面代碼，我在onMessage裡面收到訊息後，調用了this.unsubscribe(); 來取消訂閱，這樣才會執行後面的other code

3.  發布訊息測試類別

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");    }}

這個類向頻道redisChatTest發布訊息，第二步因為訂閱了該頻道，所以會收到該訊息。