Java实现Redis的消息订阅和发布

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Java实现Redis的消息订阅和发布

Redis的订阅和发布原理可以查看资料:

http://doc.redisfans.com/pub_sub/pubsub.html#pubsub-channels-pattern

下面我就用java简单实现一下:

源码地址:

http://download.csdn.net/detail/admin1973/9769527

需要导入包:

1.编写监听:

package com.leitao.threadsync.redispub;import redis.clients.jedis.JedisPubSub;/** * Created by leitao on 2017/3/3. */public class RedisMsgPubSubListener extends JedisPubSub {       @Override    public void onMessage(String channel, String message) {        System.out.println("channel:" + channel + "receives message :" + message);        //this.unsubscribe();//取消订阅    }    @Override    public void onSubscribe(String channel, int subscribedChannels) {        System.out.println("channel:" + channel + "is been subscribed:" + subscribedChannels);    }    @Override    public void onUnsubscribe(String channel, int subscribedChannels) {        System.out.println("channel:" + channel + "is been unsubscribed:" + subscribedChannels);    }}

2.订阅者

package com.leitao.threadsync.redispub;import redis.clients.jedis.Jedis;/** * Created by leitao on 2017/3/3. */public class TestSubscribe {    public  static void main(String[] args){        Jedis jedis = new Jedis("localhost");        RedisMsgPubSubListener listener = new RedisMsgPubSubListener();        /**         * 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         */        jedis.subscribe(listener, "redisChat");        //如果没有取消订阅,方法将一直堵塞在此处不会向下执行                //to do others    }}

3.发布者

package com.leitao.threadsync.redispub;import redis.clients.jedis.Jedis;/** * Created by leitao on 2017/3/3. */public class TestPublish {    public static  void  main(String[] args) throws Exception{        Jedis jedis = new Jedis("localhost");        jedis.publish("redisChat", "Redis is a great caching technique");        Thread.sleep(5000);        jedis.publish("redisChat", "build your dream");        Thread.sleep(5000);        jedis.publish("redisChat", "over");    }}

运行:

先启动订阅者,再启动发布者,控制台打印

=完=

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