第一篇：Hello World

Hello World

RabbitMQ是一个消息代理：它接受和转发消息。你可以把它想象成一个邮局：当你把邮件放在邮箱里时，你可以确定邮差先生最终会把邮件发送给你的收件人。在这个比喻中，RabbitMQ是邮政信箱，邮局和邮递员。

生产者：向RabbitMQ发生消息的程序

消费者：从RabbitMQ接受消息的程序

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>rabbitmq</groupId>
    <artifactId>rabbitmq-tutorials</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>com.rabbitmq</groupId>
            <artifactId>amqp-client</artifactId>
            <version>5.1.2</version>
        </dependency>
    </dependencies>
</project>

目录结构：

　　

com.rabbitmq.tutorials.helloworld
　　|-Recv.java
　　|-Send.java

生产者代码

package com.rabbitmq.tutorials.helloworld;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.Channel;

public class Send {
    /**
     * 队列名称
     */
  private final static String QUEUE_NAME = "hello";

  public static void main(String[] argv) throws Exception {

      //step 1: create a connection to the server
      ConnectionFactory factory = new ConnectionFactory();
      factory.setHost("192.168.0.103");//主机名称或IP地址
      Connection connection = factory.newConnection();
      Channel channel = connection.createChannel();//创建频道

      //step 2: To send, we must declare a queue for us to send to; then we can publish a message to the queue:
      channel.queueDeclare(QUEUE_NAME, false, false, false, null);//如果队列已经存在不会再创建
      String message = "Hello World!";
      channel.basicPublish("", QUEUE_NAME, null, message.getBytes());//发布消息
      System.out.println(" [x] Sent '" + message + "'");

      //step 3: Lastly, we close the channel and the connection;
      channel.close();
      connection.close();
  }
}    

消费者代码：

package com.rabbitmq.tutorials.helloworld;

import com.rabbitmq.client.*;

import java.io.IOException;

public class Recv {
    private final static String QUEUE_NAME = "hello";

    public static void main(String[] argv) throws Exception {

        //step 1: create a connection to the server
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.0.103");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        //step 2: To send, we must declare a queue for us to receive from; then we can receive a message from the queue:
        //请注意，我们也在这里声明队列。因为我们可能会在发布者之前启动消费者，所以我们希望确保队列存在，然后再试图使用消息。
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

        //告诉服务器将队列中的消息传递给我们。由于它会异步推送消息，因此我们以对象的形式提供回调，缓冲消息直到准备好使用它们。这是一个DefaultConsumer子类所做的
        Consumer consumer = new DefaultConsumer(channel) {
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body)
                    throws IOException {
                String message = new String(body, "UTF-8");
                System.out.println(" [x] Received '" + message + "'");
            }
        };
        //消费
        channel.basicConsume(QUEUE_NAME, true, consumer);

    }
}

列车rabbit-server所有的队列：

[root@bogon ~]# rabbitmqctl list_queues
Listing queues ...
amq.gen-L5p1oIQL-h-_HEdxPMTizw
amq.gen-X_1bJzROsSXzqfHj6Y8L_w
amq.gen-brpJjZlamOzpzZh2i7Q79A
amq.gen-kPfAU8lXzROVMDSYnrncyg
task_queue
...done.