rabbitMQ学习笔记(二) 简单的发送与接收消息 HelloWorld

首先要下载rabbitmq的javaClient库，然后加入到项目中，下载地址为：http://www.rabbitmq.com/releases/rabbitmq-java-client/v3.1.5/rabbitmq-java-client-bin-3.1.5.zip

1、发送消息

发送消息首先要获取与rabbitmq-server的连接，然后从渠道(chann)中指定的queue发送消息，不能定义两个queue名字相同，但属性不同

示例：

Sender01.java

 package com.zf.rabbitmq01;

 import java.io.IOException;

 import com.rabbitmq.client.Channel;

 import com.rabbitmq.client.Connection;

 import com.rabbitmq.client.ConnectionFactory;

 /**

  * 发送消息

  * @author zhoufeng

  *

  */

 public class Sender01 {

     public static void main(String[] args) throws IOException {

         ConnectionFactory connFac = new ConnectionFactory() ;

         //RabbitMQ-Server安装在本机，所以直接用127.0.0.1

         connFac.setHost("127.0.0.1");

         //创建一个连接

         Connection conn = connFac.newConnection() ;

         //创建一个渠道

         Channel channel = conn.createChannel() ;

         //定义Queue名称

         String queueName = "queue01" ;

         //为channel定义queue的属性，queueName为Queue名称

         channel.queueDeclare( queueName , false, false, false, null) ;

         String msg = "Hello World!";

         //发送消息

         channel.basicPublish("", queueName , null , msg.getBytes());

         System.out.println("send message[" + msg + "] to "+ queueName +" success!");

         channel.close();

         conn.close();

     }

 }

Recv01.java

 package com.zf.rabbitmq01;

 import java.io.IOException;

 import com.rabbitmq.client.Channel;

 import com.rabbitmq.client.Connection;

 import com.rabbitmq.client.ConnectionFactory;

 import com.rabbitmq.client.ConsumerCancelledException;

 import com.rabbitmq.client.QueueingConsumer;

 import com.rabbitmq.client.QueueingConsumer.Delivery;

 import com.rabbitmq.client.ShutdownSignalException;

 /**

  * 接收消息

  * @author zhoufeng

  *

  */

 public class Recv01 {

     public static void main(String[] args) throws IOException, ShutdownSignalException, ConsumerCancelledException, InterruptedException {

         ConnectionFactory connFac = new ConnectionFactory() ;

         connFac.setHost("127.0.0.1");

         Connection conn = connFac.newConnection() ;

         Channel channel = conn.createChannel() ;

         String queueName = "queue01";

         channel.queueDeclare(queueName, false, false, false, null) ;

         //上面的部分，与Sender01是一样的

         //配置好获取消息的方式

         QueueingConsumer consumer = new QueueingConsumer(channel) ;

         channel.basicConsume(queueName, true, consumer) ;

         //循环获取消息

         while(true){

             //获取消息，如果没有消息，这一步将会一直阻塞

             Delivery delivery = consumer.nextDelivery() ;

             String msg = new String(delivery.getBody()) ;  

             System.out.println("received message[" + msg + "] from " + queueName);

         }

     }

 }

此时，无论先后启动哪个类，都没有关系，如果执行Sender01时 Recv01还没有启动，那么消息将被保存在RabbitMQ-Server上面，直到Recv01启动后获取，才会被移除