redis发布与订阅实例

封云亭

package com.redis.test;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public class JedisPubSubTest {
public static JedisPool pool;
static {
JedisPoolConfig jedispool_config = new JedisPoolConfig();
jedispool_config.maxActive = 20;
jedispool_config.maxIdle = 0;
jedispool_config.maxWait = 1000;
jedispool_config.testOnBorrow = true;
pool = new JedisPool(jedispool_config, "127.0.0.1", 6379);
}
public static void main(String[] args) throws InterruptedException {
Jedis redisClient1 = pool.getResource();
Jedis redisClient2 = pool.getResource();
MyListener listener = new MyListener();
Publisher pub = new Publisher();
pub.publish(redisClient2); //发布一个频道

Subscriber sub = new Subscriber();
sub.psub(redisClient1, listener); // 订阅一个频道

}
}





class Subscriber {
public void psub(final Jedis redisClient, final MyListener listener) {

new Thread(new Runnable() {
@Override
public void run() {
System.out.println("订阅：news.share");
// 订阅得到信息在lister的onMessage(...)方法中进行处理
// 订阅多个频道
// redisClient.subscribe(listener, "news.share", "news.log");
//redisClient.subscribe(listener, new String[]{"news.share","news.log"});
redisClient.psubscribe(listener, new String[] { "news.share" });// 使用模式匹配的方式设置频道
}
}).start();
}
}



class Publisher {
public void publish(final Jedis redisClient) {
new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.currentThread().sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("发布：news.share");
redisClient.publish("news.share", "ok");
redisClient.publish("news.share", "hello word");
}
}).start();
}
}


消息监听：

package com.redis.test;
import redis.clients.jedis.JedisPubSub;
public class MyListener extends JedisPubSub {
// 取得订阅的消息后的处理
public void onMessage(String channel, String message) {
System.out.println(channel + "=" + message);
}
// 初始化订阅时候的处理
public void onSubscribe(String channel, int subscribedChannels) {
System.out.println(channel + "=" + subscribedChannels+"&&&&&&&");
}
// 取消订阅时候的处理
public void onUnsubscribe(String channel, int subscribedChannels) {
System.out.println(channel + "=" + subscribedChannels+"#########");
}
// 初始化按表达式的方式订阅时候的处理
public void onPSubscribe(String pattern, int subscribedChannels) {
System.out.println(pattern + "=" + subscribedChannels+"!!!!!!!");
}
// 取消按表达式的方式订阅时候的处理
public void onPUnsubscribe(String pattern, int subscribedChannels) {
System.out.println(pattern + "=" + subscribedChannels+"@@@@@@@@@");
}
// 取得按表达式的方式订阅的消息后的处理
public void onPMessage(String pattern, String channel, String message) {
System.out.println(pattern + "=" + channel + "=" + message);
}
}

结论: 经测试 sub 必须发pub 之前，否则收不到 message, 不要 pool.returnResource操作，会报异常。