参考资料: http://redis.io/topics/pubsub


3订阅Subscribe


127.0.0.1:6379> SUBSCRIBE "muc-1" // muc-1 为channel号

Reading messages... (press Ctrl-C to  quit)

// 从  redis 服务端返回的订阅结果

1) "subscribe"

2) "muc-1"

3) (integer) 1


// 接收下面 Publish的消息

1) "message"

2) "muc-1"

3) "hello, everyone"


3发布Publish（注：是广播给所有的 subscriber）


127.0.0.1:6379> PUBLISH muc-b "hello, every muc-b  friends"

(integer) 2    // 表示接收到此发布消息的 subscriber 的数目


3订阅多个channel


127.0.0.1:6379> SUBSCRIBE muc-a muc-b muc-c

Reading messages... (press Ctrl-C to  quit)

1) "subscribe"

2) "muc-a"

3) (integer) 1

1) "subscribe"

2) "muc-b"

3) (integer) 2

1) "subscribe"

2) "muc-c"

3) (integer) 3


// 接收  muc-a 通道的消息

1) "message"

2) "muc-a"

3) "hello, muc-a friends"


// 接收  muc-b 通道的消息

1) "message"

2) "muc-b"

3) "hello, muc-b friends"


3Pattern-matching订阅


127.0.0.1:6379> PSUBSCRIBE news.*

Reading messages... (press Ctrl-C to  quit)

1) "psubscribe"

2) "news.*"

3) (integer) 1


// 接收发布至 news.1 channel的消息

1) "pmessage"

2) "news.*"

3) "news.1"

4) "hello, news-1"

// 接收发布至 news-sport channel的消息

1) "pmessage"

2) "news.*"

3) "news.sport"

4) "hello, news-sport"


3列出当前所有的channels


127.0.0.1:6379> PUBSUB CHANNELS

1) "muc-c"

2) "muc-b"

3) "muc-a"

127.0.0.1:6379>


3获取指定channel上的subscriber数目


127.0.0.1:6379> PUBSUB NUMSUB muc-a

1) "muc-a"

2) "1"       // subscriber number = 1

127.0.0.1:6379> PUBSUB NUMSUB muc-b

1) "muc-b"

2) "2"       // subscriber number = 2

127.0.0.1:6379>


3使用Jedis实现简单PubSub的示例


JedisPool  pool = new JedisPool(new JedisPoolConfig(), "192.168.28.153");

Jedis jedis =  pool.getResource();

String  channel = "muc-a";

jedis.subscribe(new JedisPubSub()

{

@Override

publicvoid onUnsubscribe(String channel, int subscribedChannels)

   {

       System.out.println("onUnsubscribe - " + channel + "|" +  subscribedChannels);

   }


@Override

publicvoid onSubscribe(String channel, int subscribedChannels)

   {

       System.out.println("onSubscribe - " + channel + "|" +  subscribedChannels);

   }


@Override

publicvoid onPUnsubscribe(String pattern, int subscribedChannels)

   {

       System.out.println("onPUnsubscribe - " + pattern + "|" +  subscribedChannels);

   }


@Override

publicvoid onPSubscribe(String pattern, int subscribedChannels)

   {

       System.out.println("onPSubscribe - " + pattern + "|" +  subscribedChannels);

   }


@Override

publicvoid onPMessage(String pattern, String channel, String  message)

   {

       System.out.println("onPMessage - " + pattern + "|" +  channel + "|" + message);

   }


@Override

publicvoid onMessage(String channel, String message)

   {

       System.out.println("onMessage - " + channel + "|" +  message);

   }

}, channel);


pool.returnResource(jedis);

pool.destroy();


使用redis-cli命令PUBLISH消息：


127.0.0.1:6379> PUBLISH muc-a "hello, every muc-a  friends"

(integer) 1

127.0.0.1:6379>


在Java程序的输出中可以看到如下日志：


onSubscribe -  muc-a|1    // 在初始订阅成功后触发了onSubscribe方法

onMessage - muc-a|hello, every  muc-a friends // 在接收发布的消息后触发onMessage方法


3Python示例（基于redis-py库）


>>> import redis

>>> r =  redis.StrictRedis(host='localhost', port=6379, db=0)

>>> ps = r.pubsub()

>>> ps.subscribe('muc-a')

>>> for msg in ps.listen():

...      print msg['data']

...

1

hello, every muc-a friends