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

 1 package com.zf.rabbitmq01;
 2 
 3 import java.io.IOException;
 4 
 5 import com.rabbitmq.client.Channel;
 6 import com.rabbitmq.client.Connection;
 7 import com.rabbitmq.client.ConnectionFactory;
 8 
 9 /**
10  * 发送消息
11  * @author zhoufeng
12  *
13  */
14 public class Sender01 {
15     
16     public static void main(String[] args) throws IOException {
17         
18         ConnectionFactory connFac = new ConnectionFactory() ;
19         
20         //RabbitMQ-Server安装在本机，所以直接用127.0.0.1
21         connFac.setHost("127.0.0.1");
22         
23         //创建一个连接
24         Connection conn = connFac.newConnection() ;
25         
26         //创建一个渠道
27         Channel channel = conn.createChannel() ;
28         
29         //定义Queue名称
30         String queueName = "queue01" ;
31         
32         //为channel定义queue的属性，queueName为Queue名称
33         channel.queueDeclare( queueName , false, false, false, null) ;
34         
35         String msg = "Hello World!";
36         
37         //发送消息
38         channel.basicPublish("", queueName , null , msg.getBytes());
39         
40         System.out.println("send message[" + msg + "] to "+ queueName +" success!");
41         
42         channel.close();
43         conn.close();
44         
45     }
46 
47 }

Recv01.java

 1 package com.zf.rabbitmq01;
 2 
 3 import java.io.IOException;
 4 
 5 import com.rabbitmq.client.Channel;
 6 import com.rabbitmq.client.Connection;
 7 import com.rabbitmq.client.ConnectionFactory;
 8 import com.rabbitmq.client.ConsumerCancelledException;
 9 import com.rabbitmq.client.QueueingConsumer;
10 import com.rabbitmq.client.QueueingConsumer.Delivery;
11 import com.rabbitmq.client.ShutdownSignalException;
12 
13 /**
14  * 接收消息
15  * @author zhoufeng
16  *
17  */
18 public class Recv01 {
19 
20     public static void main(String[] args) throws IOException, ShutdownSignalException, ConsumerCancelledException, InterruptedException {
21         
22         ConnectionFactory connFac = new ConnectionFactory() ;
23         
24         connFac.setHost("127.0.0.1");
25         
26         Connection conn = connFac.newConnection() ;
27         
28         Channel channel = conn.createChannel() ;
29         
30         String queueName = "queue01";
31         
32         channel.queueDeclare(queueName, false, false, false, null) ;
33         
34         //上面的部分，与Sender01是一样的
35         
36         //配置好获取消息的方式
37         QueueingConsumer consumer = new QueueingConsumer(channel) ;
38         channel.basicConsume(queueName, true, consumer) ;
39         
40         //循环获取消息
41         while(true){
42             
43             //获取消息，如果没有消息，这一步将会一直阻塞
44             Delivery delivery = consumer.nextDelivery() ;
45             
46             String msg = new String(delivery.getBody()) ;  
47             
48             System.out.println("received message[" + msg + "] from " + queueName);
49         }
50         
51     }
52     
53 }

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