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。
总结
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