Redis笔记（七）Java实现Redis消息队列-阿里云开发者社区

Redis笔记（七）Java实现Redis消息队列

2016-05-05 6290

简介： 这里我使用Redis的发布、订阅功能实现简单的消息队列，基本的命令有publish、subscribe等。在Jedis中，有对应的java方法，但是只能发布字符串消息。为了传输对象，需要将对象进行序列化，并封装成字符串进行处理。

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这里我使用Redis的发布、订阅功能实现简单的消息队列，基本的命令有publish、subscribe等。

在Jedis中，有对应的java方法，但是只能发布字符串消息。为了传输对象，需要将对象进行序列化，并封装成字符串进行处理。

使用Redis实现消息队列

1.封装一个消息对象

public class Message implements Serializable{
 
private static final long serialVersionUID = 1L;
 
private String titile;

private String info;
 
public Message(String titile,String info){

this.titile=titile;

this.info=info;
}
 
public String getTitile() {

return titile;
}

public void setTitile(String titile) {

this.titile = titile;
}

public String getInfo() {

return info;
}

public void setInfo(String info) {

this.info = info;
}
}

2.为这个消息对象提供序列化方法

public class MessageUtil {
 
//convert To String

public static String convertToString(Object obj,String charset) throws IOException{
 

ByteArrayOutputStream bo = new ByteArrayOutputStream();

ObjectOutputStream oo = new ObjectOutputStream(bo);
oo.writeObject(obj);
String str = bo.toString(charset);
bo.close();
oo.close();

return str;
}
 
//convert To Message

public static Object convertToMessage(byte[] bytes) throws Exception{

ByteArrayInputStream in = new ByteArrayInputStream(bytes);

ObjectInputStream sIn = new ObjectInputStream(in);

return sIn.readObject();
 
}
}

3.从Jedis连接池中获取连接

public class RedisUtil {
 
/**
* Jedis connection pool
* @Title: config
*/

public static JedisPool getJedisPool(){

ResourceBundle bundle=ResourceBundle.getBundle("redis");

String host=bundle.getString("host");

int port=Integer.valueOf(bundle.getString("port"));

int timeout=Integer.valueOf(bundle.getString("timeout"));
//  String password=bundle.getString("password");
 
JedisPoolConfig config=new JedisPoolConfig();

config.setMaxActive(Integer.valueOf(bundle.getString("maxActive")));

config.setMaxWait(Integer.valueOf(bundle.getString("maxWait")));

config.setTestOnBorrow(Boolean.valueOf(bundle.getString("testOnBorrow")));

config.setTestOnReturn(Boolean.valueOf(bundle.getString("testOnReturn")));
 
JedisPool pool=new JedisPool(config, host, port, timeout);
 
return pool;
}
}

4.创建Provider类

public class Producer {
 

private Jedis jedis;

private JedisPool pool;
 

public Producer(){
pool=RedisUtil.getJedisPool();
jedis = pool.getResource();
}
 
 

public void provide(String channel,Message message) throws IOException{

String str1=MessageUtil.convertToString(channel,"UTF-8");

String str2=MessageUtil.convertToString(message,"UTF-8");
jedis.publish(str1, str2);
}
 
//close the connection

public void close() throws IOException {
//将Jedis对象归还给连接池，关闭连接
pool.returnResource(jedis);
}
}

5.创建Consumer类

public class Consumer {
 

private Jedis jedis;

private JedisPool pool;
 

public Consumer(){
pool=RedisUtil.getJedisPool();
jedis = pool.getResource();
}
 
 

public void consum(String channel) throws IOException{

JedisPubSub jedisPubSub = new JedisPubSub() {
// 取得订阅的消息后的处理

public void onMessage(String channel, String message) {

System.out.println("Channel:"+channel);

System.out.println("Message:"+message.toString());
}
 
// 初始化订阅时候的处理

public void onSubscribe(String channel, int subscribedChannels) {

System.out.println("onSubscribe:"+channel);
}
 
// 取消订阅时候的处理

public void onUnsubscribe(String channel, int subscribedChannels) {

System.out.println("onUnsubscribe:"+channel);
}
 
// 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);
}
};
 
jedis.subscribe(jedisPubSub, channel);
}
 
//close the connection

public void close() throws IOException {
//将Jedis对象归还给连接池
pool.returnResource(jedis);
}
}

6.测试方法

public static void main(String[] args){
 
Message msg=new Message("hello!", "this is the first message!");
 
Producer producer=new Producer();

Consumer consumer=new Consumer();

try {

producer.provide("chn1",msg);

consumer.consum("chn1");

} catch (IOException e) {
e.printStackTrace();
}
}