springboot结合redis实现redis订阅发布模式

redis订阅发布模式：

Redis提供了发布订阅功能，可以用于消息的传输，Redis的发布订阅机制包括三个部分，发布者，订阅者和Channel。 

发布者和订阅者都是Redis客户端，Channel则为Redis服务器端，发布者将消息发送到某个的频道，订阅了这个频道的订阅者就能接收到这条消息。Redis的这种发布订阅机制与基于主题的发布订阅类似，Channel相当于主题。

实现功能：

通过网页访问一个网址的时候实现redis在某个频道的的发布，同时订阅了该频道的redis订阅者会做出相应的反应。

要想让redis在web容器开启时就一直处于订阅状态，考虑通过listener来实现：

Listener：

@Configuration@WebListenerpublic class MyListenerOnServlet implements ServletContextListener{    @Override    public void contextInitialized(ServletContextEvent servletContextEvent) {        System.out.println("ServletContext容器初始化了。。。");        Thread threadOnRedis = new TestSubscribe();        threadOnRedis.start();    }    @Override    public void contextDestroyed(ServletContextEvent servletContextEvent) {        System.out.println("ServletContext容器销毁了。。。");    }}

TestSubScribe线程类：

public class TestSubscribe extends Thread {    @Override    public void run() {        JedisShardInfo jedisShardInfo = new JedisShardInfo("127.0.0.1", 6379);        jedisShardInfo.setPassword("admin");        Jedis jedis = new Jedis(jedisShardInfo);        RedisMsgPubSubListener listener = new RedisMsgPubSubListener();        jedis.subscribe(listener, "redisChatTest");        System.out.println("不阻塞");    }}

RedisMsgPubSubListener类：

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);    }}

通过controller的访问来触发redis的发布：

Controller：

@RequestMapping("/t07")    public String test07(@RequestParam("msg") String s){        testService.testRedisForMsg(s);        return "完成";    }

Service：

@Servicepublic class TestService {    @Autowired    private JedisPool jedisPool;    @Autowired    private UserMapper userMapper;        public void testRedisForMsg(String msg){        Jedis jedis = jedisPool.getResource();        try{            jedis.publish("redisChatTest", msg);        }catch (Exception e){            System.out.println("发布出错："+e.toString());        }finally {            if(jedis!=null){                jedis.close();            }        }    }}

jedispool配置就不解释了。差不多就是这样，在浏览器访问触发redis发布的时候，本例的响应是在控制台输出发布信息。

输出信息：

channel:redisChatTestreceives message :lvelvelve

相应可以自己决定，感觉又学到了好玩的东西。