RabbitMQ-消息應答和消息持久化技术頭條網

1.訂閱模式模型

a) 一個生產者多個消費者
b) 每個消費者都有自己的隊列
c) 生產者沒有直接把消息發送給隊列，而是先發送給交換機exchange
d) 每個隊列都要綁定到交換機上
e) 生產者發送的消息是經過交換機的，然後到達隊列，就能實現一個消息被多個消費者消費
應用場景:
比如註冊之後需要發送郵件同時需要發送短信

生產者

package com.ithzk.rabbitmq.ps;
import com.ithzk.rabbitmq.utils.RabbitMQConnectionUtils;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* @author hzk
* @date 2018/3/10
*/
public class Send {
private final static String EXCHANGER_NAME = "test_exchange_fanout";
public static void main(String[] args) throws IOException, TimeoutException {
Connection connection = RabbitMQConnectionUtils.getConnection();
Channel channel = connection.createChannel();
// 分發
channel.exchangeDeclare(EXCHANGER_NAME,"fanout");
String msg = "hello exchange";
channel.basicPublish(EXCHANGER_NAME,"",null,msg.getBytes());
System.out.println("Send msg"+msg);
channel.close();
connection.close();
}
}

消息丟失了，因為交換機沒有存儲的能力，rabbitMQ中只有隊列有存儲能力，此時還沒有隊列綁定到該交換機上，所以數據丟失了。

消費者1

package com.ithzk.rabbitmq.ps;
import com.ithzk.rabbitmq.utils.RabbitMQConnectionUtils;
import com.rabbitmq.client.*;
import javax.sound.midi.Soundbank;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* @author hzk
* @date 2018/3/10
*/
public class Recv1 {
private static final String QUEUE_NAME="test_queue_fanout_email";
private final static String EXCHANGER_NAME = "test_exchange_fanout";
public static void main(String[] args) throws IOException, TimeoutException {
//獲取連接
Connection connection = RabbitMQConnectionUtils.getConnection();
//從連接中獲取頻道
final Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME,false,false,false,null);
//綁定隊列到交換機轉發器
channel.queueBind(QUEUE_NAME,EXCHANGER_NAME,"");
//保證一次只發一個
channel.basicQos(1);
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msg = new String(body, "utf-8");
System.out.println("[1] Recv msg:" + msg);
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
System.out.println("[1] done");
channel.basicAck(envelope.getDeliveryTag(), false);
}
}
};
boolean autoAck = false;
channel.basicConsume(QUEUE_NAME,autoAck,consumer);
System.out.println("[Consumer 1 start]");

}
}

消費者2

package com.ithzk.rabbitmq.ps;
import com.ithzk.rabbitmq.utils.RabbitMQConnectionUtils;
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* @author hzk
* @date 2018/3/10
*/
public class Recv2 {
private static final String QUEUE_NAME="test_queue_fanout_sms";
private final static String EXCHANGER_NAME = "test_exchange_fanout";
public static void main(String[] args) throws IOException, TimeoutException {
//獲取連接
Connection connection = RabbitMQConnectionUtils.getConnection();
//從連接中獲取頻道
final Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME,false,false,false,null);
//綁定隊列到交換機轉發器

channel.queueBind(QUEUE_NAME,EXCHANGER_NAME,"");
//保證一次只發一個
channel.basicQos(1);
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msg = new String(body, "utf-8");
System.out.println("[2] Recv msg:" + msg);
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
System.out.println("[2] done");
channel.basicAck(envelope.getDeliveryTag(), false);
}
}
};
boolean autoAck = false;
channel.basicConsume(QUEUE_NAME,autoAck,consumer);
System.out.println("[Consumer 2 start]");
}
}