Redis笔记（七）Java实现Redis消息队列
2024-04-10 15:48:34
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
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;
}
}
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();
}
}
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;
}
}
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);
}
}
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);
}
}
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();
}
}
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