RabbitMQ中的SimpleMessageListener

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

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。后端语言核心代码如下:container.setAcknowledgeMode(AcknowledgeModide0sgrtsts另e.MAN系统运维包括哪些内容UAL);

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("1 receive msg : " + JSONObject.parseObject(new String(body)));
// 确认消息成功消费,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springSimpleMessageListener

该方法会直接应答,核心代系统运维工程师面试问题及答案码如下:container.setAcknowllinux系统edgeMode(linux是什么操作系统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;
}
}