如果RabbitMQ服务器宕机，也会造成消息丢失，可以使用消息持久化和队列持久化解决。队列持久化需要生产者和消费者都开启，消息持久化在生产者开启。
生产者：
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(); //第二个参数true，开启队列持久化，false 关闭 channel.queueDeclare(QUEUE_NAME, true, false, false, null); String message = "Hello World 1111!"; //第三个参数开启消息持久化,null关闭 channel.basicPublish("", QUEUE_NAME, MessageProperties.PERSISTENT_TEXT_PLAIN, message.getBytes()); System.out.println(" [x] Sent '" + message + "'"); channel.close(); connection.close(); } } 消费者 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(); //消费端也要队列持久化，否则报错 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缓存从服务器发来的消息 channel.basicConsume(QUEUE_NAME, true, consumer); while (true) { QueueingConsumer.Delivery delivery = consumer.nextDelivery(); //在另一个来自服务器的消息到来之前它会一直阻塞着 String message = new String(delivery.getBody()); System.out.println(" [x] Received '" + message + "'"); } } }