redis 订阅模式相关命令

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redis channel命令组提供了发布、订阅（oub/sub）模式的支持

订阅频道

psubscribe news wealther

发布频道消息

publish news "方海亮是帅哥"

publish wealther "天气晴朗"

订阅频道者收到的消息如下

127.0.0.1:6379> psubscribe news wealther
Reading messages... (press Ctrl-C to quit)
1) "psubscribe"
2) "news"
3) (integer) 1
1) "psubscribe"
2) "wealther"
3) (integer) 2
 
 
 
1) "pmessage"
2) "news"
3) "news"
4) "aaaaaa"
 
 
1) "pmessage"
2) "wealther"
3) "wealther"
4) "bbbbbb"