如果RabbitMQ伺服器宕機，也會造成訊息丟失，可以使用訊息持久化和佇列持久化解決。佇列持久化需要生產者和消費者都開啟，訊息持久化在生產者開啟。

生產者：

package persist;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.MessageProperties;

public class Send {
	private final static String QUEUE_NAME = "hello1";

	public static void main(String[] args) throws IOException, TimeoutException {
		ConnectionFactory factory = new ConnectionFactory();
		factory.setHost("localhost");
		Connection connection = factory.newConnection();
		Channel channel = connection.createChannel();
		
		//第二個引數true，開啟佇列持久化，false 關閉
		channel.queueDeclare(QUEUE_NAME, true, false, false, null);
		
		String message = "Hello World 1111!";
		
		//第三個引數開啟訊息持久化,null關閉
		channel.basicPublish("", QUEUE_NAME, MessageProperties.PERSISTENT_TEXT_PLAIN, message.getBytes());
		
		System.out.println(" [x] Sent '" + message + "'");

		channel.close();
		connection.close();
	}
}
 

package persist;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.QueueingConsumer;

public class Reqv {
	private final static String QUEUE_NAME = "hello1";

	public static void main(String[] argv) throws Exception {

		ConnectionFactory factory = new ConnectionFactory();
		factory.setHost("localhost");
		Connection connection = factory.newConnection();
		Channel channel = connection.createChannel();
		
		//消費端也要佇列持久化，否則報錯
		channel.queueDeclare(QUEUE_NAME, true, false, false, null);
		System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

		QueueingConsumer consumer = new QueueingConsumer(channel); //QueueingConsumer快取從伺服器發來的訊息
		channel.basicConsume(QUEUE_NAME, true, consumer);

		while (true) {
			QueueingConsumer.Delivery delivery = consumer.nextDelivery(); //在另一個來自伺服器的訊息到來之前它會一直阻塞著
			String message = new String(delivery.getBody());
			System.out.println(" [x] Received '" + message + "'");
		}
	}
}