Spring整合RabbitMQ-配制文件方式-2-推模式消息者

推模式的消费者

在推模式中使用可以两种实现：

1. 使用ChannelAwareMessageListener.

除消息外，还提供了Channel这个对象，通过channel可以有更大的灵活性。

import com.rabbitmq.client.Channel;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.listener.api.ChannelAwareMessageListener;

public class MesListener implements ChannelAwareMessageListener {

    @Override
    public void onMessage(Message message, Channel channel) throws Exception {
        
    }
}

2. 使用MessageListener

基本的消息的临时。普通的场景基本够用。

import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageListener;

public class MesListener implements MessageListener {
    @Override
    public void onMessage(Message message) {

    }
}

此处以ChannelAwareMessageListener为样例：

import com.rabbitmq.client.Channel;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.listener.api.ChannelAwareMessageListener;

public class MesListener implements ChannelAwareMessageListener {

    @Override
    public void onMessage(Message message, Channel channel) throws Exception {
        String encoding = message.getMessageProperties().getContentEncoding();
        System.out.println("收到的消息是：" + new String(message.getBody(), encoding));
    }
}

spring-rabbit.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:rabbit="http://www.springframework.org/schema/rabbit"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/rabbit
    http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">

    
    <rabbit:connection-factory id="connectFactory"
                               host="node1" virtual-host="/"
                               username="root" password="123456"
                               port="5672"
    >rabbit:connection-factory>


    
    <rabbit:admin id="rabbitAdmin" connection-factory="connectFactory">rabbit:admin>


    
    <rabbit:template connection-factory="connectFactory" id="rabbitTemplate"/>


    
    <rabbit:queue id="msg1" name="queue.msg" durable="false" exclusive="false" auto-delete="false">rabbit:queue>


    
    <bean id="msgListener" class="com.nullnull.learn.MesListener"/>

    
    <rabbit:listener-container connection-factory="connectFactory">
        <rabbit:listener ref="msgListener" queues="msg1">rabbit:listener>
    rabbit:listener-container>


beans>

容器启动类

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ListenerApplication {
    public static void main(String[] args) {
        //启动Spring容器
        new ClassPathXmlApplicationContext("spring-rabbit.xml");
    }
}

首先启动消费者。这样监听者就会处于监听状态。

再启动生产者，向队列中发送消息。

再观察消息者，便能看到消费者队列中已经收到了发送的消息。

收到的消息是：hello world

在推模式中消息的即时性比拉模式会好。