rabbitmq中confirm和return模式的使用

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#confirm模式 #return模式

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本文介绍了RabbitMQ的confirm和return两种模式。confirm模式下，消息到达交换机即触发回调，成功或失败都会通知。return模式则在消息未能成功投递到队列时触发回调，确保消息传递的可靠性。

confirm模式

开启confirm模式channel.confirmSelect();

这种模式，消息到达交换机时触发，若成功/失败到达交换机时，调用成功/失败回调函数。

import com.rabbitmq.client.*;

import java.io.IOException;

public class Sender {
    public static void main(String[] args) {
        ConnectionFactory factory = RabbitmqUtils.getConnectionFactory();
        Connection connection;
        Channel channel;
        try {
            connection = factory.newConnection();
            channel = connection.createChannel();
            channel.queueDeclare("direct-queue", false, false, false, null);
            channel.confirmSelect();
            channel.addConfirmListener(new ConfirmListener() {
                public void handleAck(long deliveryTag, boolean multiple) throws IOException {
                    System.out.println("ack:deliveryTag:" + deliveryTag + "，multiple:" + multiple);
                }
                public void handleNack(long deliveryTag, boolean multiple) throws IOException {
                    System.out.println("nack:deliveryTag:" + deliveryTag + "，multiple:" + multiple);
                }
            });
            for (int i = 0; i < 100; i++) {
                channel.basicPublish("", "direct-queue-1", null, "hello world".getBytes());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

只要到达了交换机（此处""是默认交换机），就会调用回调方法。

return模式

只有成功到达了交换机且未到达队列才会触发回调函数。

basicPublish方法参数boolean mandatory默认是false，需要设置为true。

package fun.gosuncn.test1;

import com.rabbitmq.client.*;

import java.io.IOException;

public class Sender {
    public static void main(String[] args) {
        ConnectionFactory factory = RabbitmqUtils.getConnectionFactory();
        Connection connection;
        Channel channel;
        try {
            connection = factory.newConnection();
            channel = connection.createChannel();
            channel.queueDeclare("direct-queue", false, false, false, null);
            channel.addReturnListener(new ReturnListener() {
                @Override
                public void handleReturn(int replyCode, String replyText, String exchange, String routingKey, AMQP.BasicProperties properties, byte[] body) throws IOException {
                    System.err.println("---------handle  return----------");
                    System.err.println("replyCode: " + replyCode);
                    System.err.println("replyText: " + replyText);
                    System.err.println("exchange: " + exchange);
                    System.err.println("routingKey: " + routingKey);
                    System.err.println("properties: " + properties);
                    System.err.println("body: " + new String(body));
                }
            });
            for (int i = 0; i < 100; i++) {
                channel.basicPublish("", "direct-queue-1", true, null, "hello world".getBytes());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}