RabbitMQ第二课--java demo

RabbitMQ 的helloword 的demo。

加入到项目的pom.xml文件中。

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

配置发送端：

package com.lk.spider.service.practice_java.rabbitmqtest;

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

import java.io.IOException;
import java.util.concurrent.TimeoutException;

/**
 * Created by LK on 2017/5/18.
 */
public class Send {
    private final static String QUEUE_NAME = "hello";

    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        String message = "Hello World!";
        channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
        System.out.println(" [x] Sent '" + message + "'");

        channel.close();
        connection.close();
    }
}

产生的执行结果：

接收端代码：

package com.lk.spider.service.practice_java.rabbitmqtest;

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

/**
 * Created by LK on 2017/5/18.
 */
public class Reqv {
    private final static String QUEUE_NAME = "hello";

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

        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

        QueueingConsumer consumer = new QueueingConsumer(channel);
        channel.basicConsume(QUEUE_NAME, true, consumer);

        while (true) {
            QueueingConsumer.Delivery delivery = consumer.nextDelivery();
            String message = new String(delivery.getBody());
            System.out.println(" [x] Received '" + message + "'");
        }
    }
}

执行结果：

下面是原理图以及解释：

这个图就能说明全部了。

Publisher 是生产者，是Message的生产者，publisher这个Clients产生了一些Message

Consumer是消费者,Publisher产生的Message，最终到达Consumer这个Clients进行消费。

Exchange：指定消息按什么规则，路由到哪个Queue,Message消息先要到达Exchange,在Server中承担着

装载Message,是Message的容器，等待被消费出去。

Routing Key：在Exchange和Queue之间的规则，Exchange通过定义好的Routing key将Message送到对应的Queue中去，是Exchange和Queue之间的桥梁。

Broker：就是一个rabbitmq server。

VirualHost: 虚拟主机，一个Broker里面可以有多个virtualHost,它的作用是用作不同用户的权限分离。

Connection:

publisher/Consumer和Broker之间的TCP连接。

Channel：在Connection里面建立的，由于老建立Connection开销过大。

具体的步骤：

1、获取Conection

ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        Connection connection = factory.newConnection();

2、获取Channel

Channel channel = connection.createChannel();

3、定义Exchange 和Queue

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

4、使用一个RoutingKey将queue 绑定到一个Exchange上。

5、通过制定一个Exchange和一个RoutingKey来将消息发送到对应的queue上。

channel.basicPublish("", QUEUE_NAME, null, message.getBytes());

6、消费者

ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

        QueueingConsumer consumer = new QueueingConsumer(channel);
        channel.basicConsume(QUEUE_NAME, true, consumer);

        while (true) {
            QueueingConsumer.Delivery delivery = consumer.nextDelivery();
            String message = new String(delivery.getBody());
            System.out.println(" [x] Received '" + message + "'");
        }

消费者，只关心Queue就行。

RabbitMQ第二课--java demo

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