docker启动rabbitmq及使用

搜索rabbitmq镜像

docker search rabbitmq:management

下载镜像

docker pull rabbitmq:management

启动容器

docker run -d --hostname localhost --name rabbitmq -p 15672:15672 -p 5672:5672 rabbitmq:management

打印容器

docker logs rabbitmq

访问RabbitMQ Management

http://localhost:15672
账户密码默认:guest

编写生产者类

package com.xun.rabbitmqdemo.example;

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 {
    private final static String QUEUE_NAME = "hello";
    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setUsername("guest");
        factory.setPassword("guest");
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setVirtualHost("/");

        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();
    }
}

运行该方法，可以看到控制台的打印

name=hello的队列收到Message

消费者

package com.xun.rabbitmqdemo.example;

import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class Receiver {
    private final static String QUEUE_NAME = "hello";
    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setUsername("guest");
        factory.setPassword("guest");
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setVirtualHost("/");
        factory.setConnectionTimeout(600000);//milliseconds
        factory.setRequestedHeartbeat(60);//seconds
        factory.setHandshakeTimeout(6000);//milliseconds
        factory.setRequestedChannelMax(5);
        factory.setNetworkRecoveryInterval(500);

        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.queueDeclare(QUEUE_NAME,false,false,false,null);
        System.out.println("Waiting for messages. ");

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

工作队列 RabbitMqUtils工具类

package com.xun.rabbitmqdemo.utils;

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

public class RabbitMqUtils {
    public static Channel getChannel() throws Exception{
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setUsername("guest");
        factory.setPassword("guest");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
        return channel;
    }
}

启动2个工作线程

package com.xun.rabbitmqdemo.workQueue;

import com.rabbitmq.client.CancelCallback;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.DeliverCallback;
import com.xun.rabbitmqdemo.utils.RabbitMqUtils;

public class Work01 {
    private static final String QUEUE_NAME = "hello";
    public static void main(String[] args) throws Exception{
        Channel channel = RabbitMqUtils.getChannel();
        DeliverCallback deliverCallback = (consumerTag,delivery)->{
            String receivedMessage = new String(delivery.getBody());
            System.out.println("接收消息:"+receivedMessage);
        };
        CancelCallback cancelCallback = (consumerTag)->{
            System.out.println(consumerTag+"消费者取消消费接口回调逻辑");
        };
        System.out.println("C1 消费者启动等待消费....");
        
        channel.basicConsume(QUEUE_NAME,true,deliverCallback,cancelCallback);
    }
}

package com.xun.rabbitmqdemo.workQueue;

import com.rabbitmq.client.CancelCallback;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.DeliverCallback;
import com.xun.rabbitmqdemo.utils.RabbitMqUtils;

public class Work02 {
    private static final String QUEUE_NAME = "hello";
    public static void main(String[] args) throws Exception{
        Channel channel = RabbitMqUtils.getChannel();
        DeliverCallback deliverCallback = (consumerTag,delivery)->{
            String receivedMessage = new String(delivery.getBody());
            System.out.println("接收消息:"+receivedMessage);
        };
        CancelCallback cancelCallback = (consumerTag)->{
            System.out.println(consumerTag+"消费者取消消费接口回调逻辑");
        };
        System.out.println("C2 消费者启动等待消费....");
        channel.basicConsume(QUEUE_NAME,true,deliverCallback,cancelCallback);
    }
}

启动工作线程

启动发送线程

package com.xun.rabbitmqdemo.workQueue;

import com.rabbitmq.client.Channel;
import com.xun.rabbitmqdemo.utils.RabbitMqUtils;
import java.util.Scanner;

public class Task01 {
    private static final String QUEUE_NAME = "hello";
    public static void main(String[] args) throws Exception{
        try(Channel channel= RabbitMqUtils.getChannel();){
            channel.queueDeclare(QUEUE_NAME,false,false,false,null);
            //从控制台接收消息
            Scanner scanner = new Scanner(System.in);
            while(scanner.hasNext()){
                String message = scanner.next();
                channel.basicPublish("",QUEUE_NAME,null,message.getBytes());
                System.out.println("发送消息完成:"+message);
            }
        }
    }
}

启动发送线程，此时发送线程等待键盘输入

发送4个消息

可以看到2个工作线程按照顺序分别接收message。

消息应答机制

rabbitmq将message发送给消费者后，就会将该消息标记为删除。
但消费者在处理message过程中宕机，会导致消息的丢失。
因此需要设置手动应答。

生产者

import com.xun.rabbitmqdemo.utils.RabbitMqUtils;
import java.util.Scanner;

public class Task02 {
    private static final String TASK_QUEUE_NAME = "ack_queue";
    public static void main(String[] args) throws Exception{
        try(Channel channel = RabbitMqUtils.getChannel()){
            channel.queueDeclare(TASK_QUEUE_NAME,false,false,false,null);
            Scanner scanner = new Scanner(System.in);
            System.out.println("请输入信息");
            while(scanner.hasNext()){
                String message = scanner.nextLine();
                channel.basicPublish("",TASK_QUEUE_NAME,null,message.getBytes());
                System.out.println("生产者task02发出消息"+ message);
            }
        }
    }
}

消费者

package com.xun.rabbitmqdemo.workQueue;
import com.rabbitmq.client.CancelCallback;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.DeliverCallback;
import com.xun.rabbitmqdemo.utils.RabbitMqUtils;
import com.xun.rabbitmqdemo.utils.SleepUtils;

public class Work03 {
    private static final String ACK_QUEUE_NAME = "ack_queue";
    public static void main(String[] args) throws Exception{
        Channel channel = RabbitMqUtils.getChannel();
        System.out.println("Work03 等待接收消息处理时间较短");
        DeliverCallback deliverCallback = (consumerTag,delivery)->{
            String message = new String(delivery.getBody());
            SleepUtils.sleep(1);
            System.out.println("接收到消息:"+message);
            
            channel.basicAck(delivery.getEnvelope().getDeliveryTag(),false);
        };
        CancelCallback cancelCallback = (consumerTag)->{
            System.out.println(consumerTag+"消费者取消消费接口回调逻辑");
        };
        //采用手动应答
        boolean autoAck = false;
        channel.basicConsume(ACK_QUEUE_NAME,autoAck,deliverCallback,cancelCallback);
    }
}

package com.xun.rabbitmqdemo.workQueue;
import com.rabbitmq.client.CancelCallback;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.DeliverCallback;
import com.xun.rabbitmqdemo.utils.RabbitMqUtils;
import com.xun.rabbitmqdemo.utils.SleepUtils;

public class Work04 {
    private static final String ACK_QUEUE_NAME = "ack_queue";
    public static void main(String[] args) throws Exception{
        Channel channel = RabbitMqUtils.getChannel();
        System.out.println("Work04 等待接收消息处理时间较长");
        DeliverCallback deliverCallback = (consumerTag,delivery)->{
            String message = new String(delivery.getBody());
            SleepUtils.sleep(30);
            System.out.println("接收到消息:"+message);
            channel.basicAck(delivery.getEnvelope().getDeliveryTag(),false);
        };
        CancelCallback cancelCallback = (consumerTag)->{
            System.out.println(consumerTag+"消费者取消消费接口回调逻辑");
        };
        //采用手动应答
        boolean autoAck = false;
        channel.basicConsume(ACK_QUEUE_NAME,autoAck,deliverCallback,cancelCallback);
    }
}

工具类SleepUtils

package com.xun.rabbitmqdemo.utils;
public class SleepUtils {
    public static void sleep(int second){
        try{
            Thread.sleep(1000*second);
        }catch (InterruptedException _ignored){
            Thread.currentThread().interrupt();
        }
    }
}

模拟

work04等待30s后发出ack

在work04处理message时手动停止线程，可以看到message:dd被rabbitmq交给了work03

不公平分发

上面的轮询分发，生产者依次向消费者按顺序发送消息，但当消费者A处理速度很快，而消费者B处理速度很慢时，这种分发策略显然是不合理的。
不公平分发：

int prefetchCount = 1;
channel.basicQos(prefetchCount);

通过此配置，当消费者未处理完当前消息，rabbitmq会优先将该message分发给空闲消费者。

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