RabbitMQ 入门 Helloworld

1. pom.xml

<!-- https://mvnrepository.com/artifact/com.rabbitmq/amqp-client -->
<dependency>
    <groupId>com.rabbitmq</groupId>
    <artifactId>amqp-client</artifactId>
    <version>4.1.0</version>
</dependency>

2 . 接收端

package com.niewj.service;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.QueueingConsumer;

import java.util.concurrent.TimeoutException;

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

    public static void main(String[] argv) throws java.io.IOException,  java.lang.InterruptedException, TimeoutException {
        //打开连接和创建频道，与发送端一样
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
        //声明队列，主要为了防止消息接收者先运行此程序，队列还不存在时创建队列。
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

//        //创建队列消费者
//        DefaultConsumer consumer = new DefaultConsumer(channel);
//        //指定消费队列
//        channel.basicConsume(QUEUE_NAME, true, consumer);
//        while (true) {
//            //nextDelivery是一个阻塞方法（内部实现其实是阻塞队列的take方法）
//            DefaultConsumer.Delivery delivery = consumer.nextDelivery();
//            String message = new String(delivery.getBody());
//            System.out.println(" [x] Received '" + message + "'");
//        }

        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] 接收消息 '" + message + "'");
            }
        };
        channel.basicConsume(QUEUE_NAME, true, consumer);

    }
}

3. 发送端

package com.niewj.service;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import java.util.concurrent.TimeoutException;

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

    public static void main(String[] argv) throws java.io.IOException, TimeoutException {
        //创建连接连接到MabbitMQ
        ConnectionFactory factory = new ConnectionFactory();
        //设置MabbitMQ所在主机ip或者主机名
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        //创建一个连接
        Connection connection = factory.newConnection();
        //创建一个频道
        Channel channel = connection.createChannel();
        //指定一个队列
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        //发送的消息
        String message = "{\"name\": \"nie\" }, \"online\": false}";
        //往队列中发出一条消息
        channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
        System.out.println(" [x] 发送 '" + message + "'");
        //关闭频道和连接
        channel.close();
        connection.close();
    }
}

启动接受端, 然后使用发送端发消息，便可以接收到。