RabbitMQ小试牛刀

1.安装Erlang语言，和RabbitMQ server（可以选择windows和linux系统）（这个可以百度），我用的windows环境。

进入../sbin (rabbitMQ安装目录)

rabbitmqctl -q status //打印了一些rabbitmq服务状态信息，包括内存，硬盘，和使用erlong的版本信息

rabbitmqctl list_queues //查看所有队列消息

2. 默认情况下RabbitMQ服务的用户名和密码都是“guest”，这个账户是有限制的，默认只能通过localhost访问，远程访问权限受限，所以需要给它添加一个用户，并设置相应的访问权限。

添加一个新用户 "root"，密码是“root”:

E:\RabbitMQ\rabbitmq_server-3.7.7\sbin>rabbitmqctl add_user root root
Creating  user  " root "  ....

为root用户设置权限:

E:\RabbitMQ\rabbitmq_server-3.7.7\sbin>rabbitmqctl set_permission -p / root ".*"  ".*"  ".*"
Setting permissions for user  "root " in vhost "/" ...

设置root用户为管理员角色:

E:\RabbitMQ\rabbitmq_server-3.7.7\sbin>rabbitmqctl set_user_tags root administrator
Setting  tags  for  user  " root"  to  [administrator] ...

3.新建maven项目，导入依赖

<dependency>
     <groupId>com.rabbitmq</groupId>
     <artifactId>amqp-client</artifactId>
     <version>5.2.0</version>
</dependency>

4.客户端消息生产者代码

package com.wusu.consumer;

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

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

public class RabbitmqProducer {
    private static final String EXCHANGE_NAME="exchange_demo";
    private static final String ROUTING_KEY="routingkey_demo";
    private static final String QUEUE_NAME="queue_demo";
    private static final String IP_ADDRESS="127.0.0.1";
    private static final int PORT=5672;

    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost(IP_ADDRESS);
        factory.setPort(PORT);
        factory.setUsername("root");
        factory.setPassword("root");
        Connection connection = factory.newConnection(); //创建连接
        Channel channel = connection.createChannel();//创建信道
        //创建一个type="direct" 、持久化，非自动删除的交换器
        channel.exchangeDeclare(EXCHANGE_NAME,"direct",true,false,null);
        //创建一个持久化，非排他的，非自动删除的队列
        channel.queueDeclare(QUEUE_NAME,true,false,false,null);
        //将交换器与队列通过路由绑定
        channel.queueBind(QUEUE_NAME,EXCHANGE_NAME,ROUTING_KEY);
        //发送持久化信息
        String message = "hello world";
        channel.basicPublish(EXCHANGE_NAME,ROUTING_KEY,MessageProperties.PERSISTENT_TEXT_PLAIN,message.getBytes());
        channel.close();
        connection.close();
    }
}

5.客户端消息消费者代码

package com.wusu.producer;

import com.rabbitmq.client.*;
import org.omg.CORBA.TIMEOUT;

import java.awt.*;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class RabbitmqConsumer {
    private static final String QUEUE_NAME="queue_demo";
    private static final String IP_ADDRESS="127.0.0.1";
    private static final int PORT=5672;

    public static void main(String[] args) throws IOException, TimeoutException, InterruptedException {
        Address[] addresses = {new Address(IP_ADDRESS, PORT)};
        ConnectionFactory factory = new ConnectionFactory();
        factory.setPassword("root");
        factory.setUsername("root");
        Connection connection = factory.newConnection(addresses); //创建连接
        Channel channel = connection.createChannel();//创建信道
        channel.basicQos(64);//设置客户端最多接受违背ack的信息的个数
        Consumer consumer = new DefaultConsumer(channel){
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                System.out.println("recieve message :"+new String(body));
                try {
                    TimeUnit.SECONDS.sleep(1);
                }catch (InterruptedException e){
                    e.printStackTrace();
                }
                channel.basicAck(envelope.getDeliveryTag(),false);
            }
        };
        channel.basicConsume(QUEUE_NAME,consumer);
        TimeUnit.SECONDS.sleep(5);
        channel.close();
        connection.close();
    }

}

6.通过rabbitMQ控制台查看消息情况

首先进入安装目录的.../sbin中，使用如下命令开启网页版控制台

E:\RabbitMQ\rabbitmq_server-3.7.7\sbin>rabbitmq-plugins enable rabbitmq_management

然后本地使用http://127.0.0.1:15672 即可打开RabbitMQ的控制台

如下所示，生产者生产了一条消息：

当本地消费者把这条消息消费后，里面的消息就没有了。

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