RabbitMQ系列(三)--Java API
基于java使用RabbitMQ
框架:SpringBoot1.5.14.RELEASE
maven依赖:
<dependency>
<groupId>com.rabbitmq</groupId>
<artifactId>amqp-client</artifactId>
<version>3.6.5</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-amqp</artifactId>
</dependency>
本文只是操作原生RabbitMQ,并没有和SpringBoot进行整合,后面介绍整合,基于注解使用
一、quick start
1.1、Consumer
public static void main(String[] args) throws Exception{
//1 创建一个ConnectionFactory, 并进行配置
ConnectionFactory factory = new ConnectionFactory();
factory.setVirtualHost("/");
factory.setHost("139.196.75.238");
factory.setPort(5672);
//2 通过连接工厂创建连接
Connection connection = factory.newConnection();
//3 通过connection创建一个Channel
Channel channel = connection.createChannel(); //4 声明(创建)一个队列
channel.queueDeclare("test002", true, false, false, null); //5 创建消费者
QueueingConsumer queueingConsumer = new QueueingConsumer(channel); //6 设置Channel
channel.basicConsume("test002", true, queueingConsumer); while(true){
//7 获取消息
QueueingConsumer.Delivery delivery = queueingConsumer.nextDelivery();
String msg = new String(delivery.getBody());
log.info(msg);
}
}
}
Consumer
参数解释:
durable:是否持久化,Durable:是,即使服务器重启,这个队列也不会消失,Transient:否
exclusive:这个queue只能由一个exchange监听restricted to this connection,使用场景:顺序消费
autoDelete:当最后一个Binding到Exchange的Queue删除之后,自动删除该Exchange
arguments:参数
autoACK:是否自动签收,对应着手动签收
1.2、Producer
public class Producer { public static void main(String[] args) throws Exception{
//1 创建一个ConnectionFactory, 并进行配置
ConnectionFactory factory = new ConnectionFactory();
factory.setVirtualHost("/");
factory.setHost("139.196.75.238");
factory.setPort(5672);
//2 通过连接工厂创建连接
Connection connection = factory.newConnection();
//3 通过connection创建一个Channel
Channel channel = connection.createChannel();
//4 通过Channel发送数据
for(int i=0; i < 5; i++){
String msg = "Hello RabbitMQ!";
//1 exchange 2 routingKey
channel.basicPublish("", "test002", null, msg.getBytes());
}
//5 关闭相关的连接
channel.close();
factory.clone();
}
}
Producer
参数解释:
exchange name:
routingKey:路由规则
BasicProperties:
body:message中的body
结果:
17:43:49.351 [main] INFO com.it.quickstart.Consumer - Hello RabbitMQ!
17:43:49.351 [main] INFO com.it.quickstart.Consumer - Hello RabbitMQ!
17:43:49.351 [main] INFO com.it.quickstart.Consumer - Hello RabbitMQ!
17:43:49.351 [main] INFO com.it.quickstart.Consumer - Hello RabbitMQ!
17:43:49.351 [main] INFO com.it.quickstart.Consumer - Hello RabbitMQ!
我们使用RabbitMQ,需要首先在可视化界面确定queue,exchange是否创建,对应关系是否正常,这是一个大前提
1.3、自定义消费者
之前接收message,通过while(true),感觉太low了,RabbitMQ支持实现自定义消费者,只需要集成DefaultConsumer,重写handlerDelivery,
构造器
public class MyConsumer extends DefaultConsumer {
public MyConsumer(Channel channel) {
super(channel);
} @Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
System.err.println("-----------consume message----------");
System.err.println("consumerTag: " + consumerTag);
System.err.println("envelope: " + envelope);
System.err.println("properties: " + properties);
System.err.println("body: " + new String(body));
}
}
MyConsumer
而consumer只需要修改
//5 创建消费者
QueueingConsumer queueingConsumer = new QueueingConsumer(channel); //去掉这一步
//6 设置Channel
channel.basicConsume("test002", true, new MyConsumer(channel));
结果:
-----------consume message----------
consumerTag: amq.ctag-YK7CnvWxTpm6hmuyUyqSkQ
envelope: Envelope(deliveryTag=1, redeliver=false, exchange=, routingKey=test002)
properties: #contentHeader<basic>(content-type=null, content-encoding=null, headers=null, delivery-mode=null, priority=null, correlation-id=null, reply-to=null, expiration=null, message-id=null, timestamp=null, type=null, user-id=null, app-id=null, cluster-id=null)
body: Hello RabbitMQ By MyConsumer!
二、Exchange
Exchange有四种方式Fanout、Direct、Topic、Headers,而我们上面的例子,并没有定义Exchange,RabbitMQ默认使用AMQP default,
要求routing key和queue name相同
本文只是介绍前三种,Headers几乎用不到
2.1、Fanout
fanout效率是最好的,不需要routing key,你可以随便设置都无所谓,只要consumer和producer的Exchange name相同
producer
public class Producer { public static void main(String[] args) throws Exception{
ConnectionFactory factory = new ConnectionFactory();
factory.setVirtualHost("/");
factory.setHost("139.196.75.238");
factory.setPort(5672); Connection connection = factory.newConnection();
Channel channel = connection.createChannel(); String exchangeName = "exchange_fanout";
channel.basicPublish(exchangeName, "", null, "send message by fanout".getBytes());
}
}
Producer Fanout
consumer
public class Consumer { public static void main(String[] args) throws Exception{
ConnectionFactory factory = new ConnectionFactory();
factory.setVirtualHost("/");
factory.setHost("139.196.75.238");
factory.setPort(5672); factory.setAutomaticRecoveryEnabled(true);
factory.setNetworkRecoveryInterval(3000); Connection connection = factory.newConnection();
Channel channel = connection.createChannel(); String exchangeName = "exchange_fanout";
String exchangeType = "fanout";
String queueName = "queue_fanout";
String routingKey = ""; //不设置路由键 channel.exchangeDeclare(exchangeName, exchangeType, true, false, false, null);
channel.queueDeclare(queueName, true, false, false, null);
channel.queueBind(queueName, exchangeName, routingKey); channel.basicConsume(queueName, true, new MyConsumer(channel));
}
}
Consumer Fanout
结果:
-----------consume message----------
consumerTag: amq.ctag-rXw7SbaR5aWVMQxZY6SfEA
envelope: Envelope(deliveryTag=1, redeliver=false, exchange=exchange_fanout, routingKey=)
properties: #contentHeader<basic>(content-type=null, content-encoding=null, headers=null, delivery-mode=null, priority=null, correlation-id=null, reply-to=null, expiration=null, message-id=null, timestamp=null, type=null, user-id=null, app-id=null, cluster-id=null)
body: send message by fanout
我们声明queue和exchange之后,要先观察exchange和queue对应关系
点击exchange name,进去查看是否binding成功,如果成功如下图
注意点:
1、fanout模式下不是直接操作Queue,而是把消息发送给Exchange,由Exchange把消息分发给与之绑定的Queue,也就是广播模式
2、Queue必须和Exchange进行绑定
3、每个Consumer的Queue name不能相同,个人测试下,相同的Queue name,只能有一个Consumer收到消息
2.2、Direct
完全把代码贴出来太浪费篇幅了,而且毫无意思,后面只说一下区别,顺便说一下,对于queue和exchange的declare无论放到producer还是
Consumer都可以的,个人习惯Consumer,而且二者启动顺序没有要求,因为RabbitMQ的消息具有堆积功能
Producer:
String exchangeName = "exchange_direct";
String routingKey = "key.direct"; channel.basicPublish(exchangeName, routingKey, null, "send message by direct".getBytes());
Consumer:
String exchangeName = "exchange_direct";
String exchangeType = "direct";
String queueName = "queue_direct";
String routingKey = "key.direct"; channel.exchangeDeclare(exchangeName, exchangeType, true, false, false, null);
channel.queueDeclare(queueName, true, false, false, null);
channel.queueBind(queueName, exchangeName, routingKey); channel.basicConsume(queueName, true, new MyConsumer(channel));
结果:
-----------consume message----------
consumerTag: amq.ctag-6UeNiGs1K-gMWbwvVn8F5A
envelope: Envelope(deliveryTag=1, redeliver=false, exchange=exchange_direct, routingKey=key.direct)
properties: #contentHeader<basic>(content-type=null, content-encoding=null, headers=null, delivery-mode=null, priority=null, correlation-id=null, reply-to=null, expiration=null, message-id=null, timestamp=null, type=null, user-id=null, app-id=null, cluster-id=null)
body: send message by direct
说明:
Direct要求routingKey完全一致
2.3、 topic
Producer:
String exchangeName = "exchange_topic";
String routingKey1 = "user.save";
String routingKey2 = "user.update";
String routingKey3 = "user.delete.abc";
//5 发送 String msg = "Send Message By topic";
channel.basicPublish(exchangeName, routingKey1 , null , msg.getBytes());
channel.basicPublish(exchangeName, routingKey2 , null , msg.getBytes());
channel.basicPublish(exchangeName, routingKey3 , null , msg.getBytes());
Consumer:
String exchangeName = "exchange_topic";
String exchangeType = "topic";
String queueName = "queue_topic";
String routingKey = "user.*"; channel.exchangeDeclare(exchangeName, exchangeType, true, false, false, null);
channel.queueDeclare(queueName, true, false, false, null);
channel.queueBind(queueName, exchangeName, routingKey);
说明:
Topic支持通配符匹配,#匹配一个或多个单词,*匹配一个单词
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