RabbitMQ相关使用_综合

判断队列是否存在, 如果指定的队列存在，则正常返回，反之则抛出异常

        try {AMQP.Queue.DeclareOk declareOk = channel.queueDeclarePassive(QUEUE_NAME);String queue = declareOk.getQueue();System.out.println(queue);} catch (Exception e) {logger.warn(e.getMessage(), e);}

注意 :

如果在使用Channel的时候已经处于关闭状态,那么程序会抛出一个com.rabbitmq.client.ShutdownSignalException，我们只需要捕捉这个异常即可，也要试着捕捉IOException、SocketException，以防Conneciton意外关闭。

交换器与交换器绑定示例：

package com.song.songvue.config.message;import com.rabbitmq.client.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.io.IOException;
import java.util.concurrent.TimeoutException;/*** 生产者客户端代码*/
public class RabbitProducer {private static final Logger logger = LoggerFactory.getLogger(RabbitProducer.class);private static final String EXCHANGE_NAME = "exchange_demo";private static final String ROUTING_KEY = "routing_key";private static final String QUEUE_NAME = "queue_test";private static final String IP_ADDRESS = "192.168.10.110";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("1234567");// 创建连接Connection connection = factory.newConnection();// 创建信道Channel channel = connection.createChannel();// source交换器channel.exchangeDeclare("source", "direct", false, true, null);// destination交换器channel.exchangeDeclare("destination", "fanout", false, true, null);// 交换器与交换器绑定channel.exchangeBind("destination", "source", "exKey");// 队列声明channel.queueDeclare("queue_a", false, false, true, null);// 交换器绑定队列channel.queueBind("queue_a", "destination", "");// 生产者发送消息至交换器 source.channel.basicPublish("source", "exKey", null, "exToExDemo".getBytes());// 关闭资源channel.close();connection.close();}
}

消费者代码：

package com.song.songvue.config.message;import com.rabbitmq.client.*;import java.io.IOException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;/* 消费者客户端代码*/
public class RabbitConsumer {private static final String QUEUE_NAME = "queue_a";private static final String IP_ADDRESS = "192.168.10.110";private static final int PORT = 5672;public static void main(String[] args) throws IOException, TimeoutException, InterruptedException {Address[] addresses = new Address[]{new Address(IP_ADDRESS, PORT)};ConnectionFactory factory = new ConnectionFactory();factory.setUsername("root");factory.setPassword("1234567");Connection connection = factory.newConnection(addresses);// 创建信道Channel channel = connection.createChannel();// 设置客户端最多接收未被ack的消息个数channel.basicQos(64);Consumer consumer = new DefaultConsumer(channel) {@Overridepublic void handleDelivery(String consumerTag, Envelope envelope,AMQP.BasicProperties properties, byte[] body) throws IOException {System.out.println("recv message:" + new String(body));try {TimeUnit.SECONDS.sleep(1);} catch (InterruptedException e) {e.printStackTrace();}channel.basicAck(envelope.getDeliveryTag(), false);}};channel.basicConsume(QUEUE_NAME, consumer);// 等到回调函数执行完毕后，关闭资源TimeUnit.SECONDS.sleep(5);channel.close();connection.close();}
}

Queue.DeclareOk queueDeclare(String queue,boolean durable,boolean exclusive,boolean autoDelete,Map<String, Object> arguments) throws IOException;

queue: 队列的名称

durable: 设置是否持久化，为true则设置队列为持久化，持久化的队列会存盘，在服务器重启时可以保证不丢失相关信息

exclusive: 设置是否排他。为true则设置队列为排他的。如果一个队列被设置为排他队列，该队列仅对首次声明它的连接可见，并在连接断开时自动删除。排他队列是基于连接Connection可见的,同一个连接的不同信道（Channel）是可以同时访问同一个连接创建的排他队列。其他队列不允许建立同名的排他队列，这个队列与普通队列不同，一旦连接关闭或者客户端退出，该排他队列都会被删除，这种队列适用于一个客户端同时发送和读取消息的应用场景

autoDelete: 设置是否自动删除。为true则设置为自动删除。

自动删除的前提：至少有一个消费者连接到这个队列，之后所有与这个队列连接的消费者都断开时，才会自动删除。