RabbitMQ-1. Quick start in simple mode

Start:

browser input:
http://127.0.0.1:15672 The
default account and password are both guest,

Add a user such as the account heima, and the password is also heima.
Create a virtual machine (general/beginning) and set it for heima to use:



the setting is successful:

1. RabbitMQ-Quick Start with Simple Mode

The following demonstrates the simple mode:


create two maven projects without skeletons:

1. Producer:

1.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>cn.itcast</groupId>
    <artifactId>RabbitMQ_provider1</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <dependencies>
        <dependency>
            <groupId>com.rabbitmq</groupId>
            <artifactId>amqp-client</artifactId>
            <version>5.6.0</version>
        </dependency>
    </dependencies>

</project>

2.Producer_HelloWorld：

package com.itheima.producer;

/**
 * @author QLBF
 * @version 1.0
 * @date 2021/2/26 10:55
 */


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

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

/**
 * 发送消息
 */
public class Producer_HelloWorld {
    
    
    public static void main(String[] args) throws IOException, TimeoutException {
    
    
        //1.创建连接工厂
        ConnectionFactory factory=new ConnectionFactory();
        //2. 设置参数
        factory.setHost("127.0.0.1"); //ip,写RabbitMQ启动的ip
        factory.setPort(5672);//端口  默认值 5672
        factory.setVirtualHost("/itcast"); //虚拟机 默认值/
        factory.setUsername("heima"); //用户名 默认 guest
        factory.setPassword("heima"); //密码 默认值 guest
        //3. 创建连接 Connection
        Connection connection=factory.newConnection();
        //4. 创建Channel
        Channel channel=connection.createChannel();
        //5. 创建队列Queue
        /*
        queueDeclare(String queue, boolean durable, boolean exclusive, boolean autoDelete, Map<String, Object> arguments)
        参数：
            1. queue：队列名称
            2. durable:是否持久化，当mq重启之后，还在
            3. exclusive：
                * 是否独占。只能有一个消费者监听这队列
                * 当Connection关闭时，是否删除队列
                *
            4. autoDelete:是否自动删除。当没有Consumer时，自动删除掉
            5. arguments：参数。

         */
        //如果没有一个名字叫hello_world的队列，则会创建该队列，如果有则不会创建
        channel.queueDeclare("hello_world",true,false,false,null);
        /*
        basicPublish(String exchange, String routingKey, BasicProperties props, byte[] body)
        参数：
            1. exchange：交换机名称。简单模式下交换机会使用默认的 ""(简单模式相当于没交换机)
            2. routingKey：路由名称，与上面的队列对应
            3. props：配置信息
            4. body：发送消息数据

         */
        String boby="hello rabbitMQ1...";
        //6. 发送消息
        channel.basicPublish("","hello_world",null,boby.getBytes());

        //7.释放资源
        channel.close();
        connection.close();

    }
}

Then run, tomcat, and then run the above class, you can see it in the browser:

2. Consumers:

（1） 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>cn.itcast</groupId>
    <artifactId>RabbitMQ_consumer1</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <dependencies>
        <dependency>
            <groupId>com.rabbitmq</groupId>
            <artifactId>amqp-client</artifactId>
            <version>5.6.0</version>
        </dependency>
    </dependencies>
    
</project>

（2）com.itheima.consumer.Consumer_HelloWorld：

package com.itheima.consumer;

import com.rabbitmq.client.*;

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

/**
 * @author QLBF
 * @version 1.0
 * @date 2021/2/26 11:39
 */
public class Consumer_HelloWorld {
    
    
    public static void main(String[] args) throws IOException, TimeoutException {
    
    
        //1.创建连接工厂
        ConnectionFactory factory=new ConnectionFactory();
        //2. 设置参数
        factory.setHost("127.0.0.1"); //ip,写RabbitMQ启动的ip
        factory.setPort(5672);//端口  默认值 5672
        factory.setVirtualHost("/itcast"); //虚拟机 默认值/，这个是我在启动Rabbit网站设置的
        factory.setUsername("heima"); //用户名 默认 guest
        factory.setPassword("heima"); //密码 默认值 guest
        //3. 创建连接 Connection
        Connection connection=factory.newConnection();
        //4. 创建Channel
        Channel channel=connection.createChannel();
        //5. 创建队列Queue
        /*
        queueDeclare(String queue, boolean durable, boolean exclusive, boolean autoDelete, Map<String, Object> arguments)
        参数：
            1. queue：队列名称
            2. durable:是否持久化，当mq重启之后，还在
            3. exclusive：
                * 是否独占。只能有一个消费者监听这队列
                * 当Connection关闭时，是否删除队列
                *
            4. autoDelete:是否自动删除。当没有Consumer时，自动删除掉
            5. arguments：参数。

         */
        //如果没有一个名字叫hello_world的队列，则会创建该队列，如果有则不会创建
        channel.queueDeclare("hello_world",true,false,false,null);
        /*
        basicConsume(String queue, boolean autoAck, Consumer callback)
        参数：
            1. queue：队列名称,从生产者的hello_world拿出来
            2. autoAck：是否自动确认
            3. callback：回调对象

         */
        // 6.接收消息
        Consumer consumer=new DefaultConsumer(channel){
    
    
            /*
                回调方法，当收到消息后，会自动执行该方法

                1. consumerTag：标识
                2. envelope：获取一些信息，交换机，路由key...
                3. properties:配置信息
                4. body：数据

             */
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
    
    
                System.out.println("consumerTag："+consumerTag);
                System.out.println("Exchange："+envelope.getExchange());
                System.out.println("RoutingKey："+envelope.getRoutingKey());
                System.out.println("properties："+properties);
                System.out.println("body："+new String(body)); //获取生产者发给MQ的消息，转为字符串
            }
        };
        channel.basicConsume("hello_world",true,consumer);

        //7关闭资源？不要
    }
}

Then run it directly, and it can get the message sent by the producer from the queue:
remember to run the producer's tomcat first, then run its sending information class, and then run the consumer's receiving information class.