RabbitMQ中的SimpleMessageListener _rabbitmq

吾生也有涯,而知也无涯。这篇文章主要讲述RabbitMQ中的SimpleMessageListener相关的知识，希望能为你提供帮助。

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通过上文可以使用rabbitmq了，但是有这样一个特殊需求，想不使用通用的配置，而是该队列使用特殊的配置，那么就可以使用SimpleMessageListener，来自定义消费者。
1.代码实现
可以看到下文两个方法配置了两种应答方式，方法一为手动应答，方法二为自动应答。
1.手动应答SimpleMessageListener【RabbitMQ中的SimpleMessageListener】如正规方式一样，使用手动应答，需要在接收到消息后手动发送ack/nack。核心代码如下：container.setAcknowledgeMode(AcknowledgeMode.MANUAL);

import org.springframework.amqp.core.AcknowledgeMode;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
import org.springframework.amqp.rabbit.listener.api.ChannelAwareMessageListener;
import org.springframework.amqp.support.ConsumerTagStrategy;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;

import com.alibaba.fastjson.JSONObject;
import com.rabbitmq.client.Channel;
import org.springframework.context.annotation.Configuration;

@Configuration
public class SimpleMessageListener {

@Bean
public SimpleMessageListenerContainer messageContainer(ConnectionFactory connectionFactory) {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer(connectionFactory);
// 添加队列可以添加多个队列
container.setExposeListenerChannel(true);
// 设置当前的消费者数量
// container.setMaxConcurrentConsumers(5);
container.setConcurrentConsumers(1);
// 设置确认模式手工确认
container.setAcknowledgeMode(AcknowledgeMode.MANUAL);
container.setMessageListener(new ChannelAwareMessageListener() {
@Override
public void onMessage(Message message, Channel channel) throws Exception {
byte[] body = message.getBody();
System.out.println("1receive msg : " + JSONObject.parseObject(new String(body)));
// 确认消息成功消费，删除消息队列中的消息，他跟上面貌似一样
channel.basicAck(message.getMessageProperties().getDeliveryTag(), true);
}
});
return container;
}

}

2.自动应答SimpleMessageListener该方法会直接应答，核心代码如下：container.setAcknowledgeMode(AcknowledgeMode.AUTO);

import org.springframework.amqp.core.AcknowledgeMode;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
import org.springframework.amqp.rabbit.listener.api.ChannelAwareMessageListener;
import org.springframework.amqp.support.ConsumerTagStrategy;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;

import com.alibaba.fastjson.JSONObject;
import com.rabbitmq.client.Channel;
import org.springframework.context.annotation.Configuration;

@Configuration
public class SimpleMessageListener {

@Bean
public SimpleMessageListenerContainer messageContainer2(ConnectionFactory connectionFactory) {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer(connectionFactory);
// 设置当前消费者数量
container.setConcurrentConsumers(1);
// 设置最大的消费者数量
container.setMaxConcurrentConsumers(5);
// 设置不要重回队列
container.setDefaultRequeueRejected(false);
// 设置自动签收
container.setAcknowledgeMode(AcknowledgeMode.AUTO);
// 设置消费端tag策略
container.setConsumerTagStrategy(new ConsumerTagStrategy() {
@Override
public String createConsumerTag(String queue) {
return queue + "_" + System.currentTimeMillis();
}
});
// 设置监听
container.setMessageListener(new ChannelAwareMessageListener() {
@Override
public void onMessage(Message message, Channel channel) throws Exception {
// 消息处理
String msg = new String(message.getBody(), "UTF-8");
System.out.println("---消费者---队列名：" + message.getMessageProperties().getConsumerQueue() + "，消息：" + msg
+ ",deliveryTag：" + message.getMessageProperties().getDeliveryTag());
channel.basicAck(message.getMessageProperties().getDeliveryTag(), false); ;
}
});
return container;
}
}