RabbitMQ学习——生产者与消费者入门例子

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生产者

package com.learn.rabbitmqapi.message;

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

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

public class Producer {
    public static final String MQ_HOST = "192.168.222.101";
    public static final String MQ_VHOST = "/";
    public static final int MQ_PORT = 5672;

    public static void main(String[] args) throws IOException, TimeoutException {
        //1. 创建一个ConnectionFactory
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost(MQ_HOST);//配置host
        connectionFactory.setPort(MQ_PORT);//配置port
        connectionFactory.setVirtualHost(MQ_VHOST);//配置vHost

        //2. 通过连接工厂创建连接
        Connection connection = connectionFactory.newConnection();
        //3. 通过connection创建一个Channel
        Channel channel = connection.createChannel();

        //4. 通过Channel发送数据
        for (int i = 0; i < 10; i++) {
            String message = "Hello" + i;
            //exchange为"",则通过routingKey取寻找队列
            channel.basicPublish("","testQueue",null,message.getBytes());
        }

        //5. 关闭连接
        channel.close();
        connection.close();

    }
}

消费者

package com.learn.rabbitmqapi.message;

import com.rabbitmq.client.*;

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

public class Consumer {
    public static final String MQ_HOST = "192.168.222.101";
    public static final String MQ_VHOST = "/";
    public static final int MQ_PORT = 5672;

    public static final String QUEUE_NAME = "testQueue";

    public static void main(String[] args) throws Exception {
        //1. 创建一个ConnectionFactory
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost(MQ_HOST);//配置host
        connectionFactory.setPort(MQ_PORT);//配置port
        connectionFactory.setVirtualHost(MQ_VHOST);//配置vHost

        //2. 通过连接工厂创建连接
        Connection connection = connectionFactory.newConnection();

        //3. 通过connection创建一个Channel
        Channel channel = connection.createChannel();

        //4. 声明(创建)一个队列
        channel.queueDeclare(QUEUE_NAME,true,false,false,null);

        //5. 创建消费者
        QueueingConsumer queueingConsumer = new QueueingConsumer(channel);

        //6. 设置Channel
        channel.basicConsume(QUEUE_NAME,true,queueingConsumer);

        int num = 0;
        //7. 获取消息
        while (true) {
            //nextDelivery 会阻塞直到有消息过来
            QueueingConsumer.Delivery delivery = queueingConsumer.nextDelivery();

            String message = new String(delivery.getBody());
            System.out.println("收到:" + message);
            num++;
            if (num == 8) {
                break;
            }
        }

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

    }
}

先启动消费者，消费者代码会新建一个队列，再启动生成者