RabbitMq简单实例

RabbitMq，先随便写了例子，假如想用在项目中，单例模式即可：

public class MQConstant {
	public static final String EXCHANGE_NAME = "liuExchange";
	public static final String QUEUE_NAME = "liuQueue";
	public static final String RoutingKey = "liuRoutingKey";
}

public class Produce {
	private static final Logger log = LoggerFactory.getLogger(Produce.class);
	public static void main(String[] args) throws IOException, TimeoutException {
		Produce p = new Produce();
		p.doSend();
	}

	private void doSend() throws IOException, TimeoutException {
		Connection connection = null;
		Channel channel = null;
		try {
			// 获取连接通道
			ConnectionFactory factory = new ConnectionFactory();
			factory.setHost("localhost");
			connection = factory.newConnection();
			channel = connection.createChannel();
			// 声明队列(非必要代码)，注意这里的配置要和已建立的交换器一致，不然会报错。durable-持久化
//			channel.queueDeclare(MQConstant.QUEUE_NAME, true, false, false, null);
			String message = "Hello World!";
			channel.basicPublish(MQConstant.EXCHANGE_NAME, MQConstant.RoutingKey, null, message.getBytes("UTF-8"));
			System.out.println("[Produce] Sent:'" + message + "'");
		} catch (Exception e) {
			log.error("发送出错：", e);
		} finally {
			if (channel != null) {
				channel.close();
			}
			if (connection != null) {
				connection.close();
			}
		}
	}
}

public class Consumer {
	private static final Logger log = LoggerFactory.getLogger(Produce.class);

	public static void main(String[] args) throws IOException, TimeoutException {

		Connection connection = null;
		Channel channel = null;
		try {
			ConnectionFactory factory = new ConnectionFactory();
			factory.setHost("localhost");
			connection = factory.newConnection();
			channel = connection.createChannel();

			channel.queueDeclare(MQConstant.QUEUE_NAME, false, false, false, null);
			DefaultConsumer 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("[Consumer] Received:'" + message + "'");
				}
			};
			// 自动回复队列应答，不然一个消息可以被重复消费
			String basicConsume = channel.basicConsume(MQConstant.QUEUE_NAME, true, consumer);
			System.out.println(basicConsume);
			Thread.sleep(1000L);
		} catch (Exception e) {
			log.error("发送出错：", e);
		} finally {
			if (channel != null) {
				channel.close();
			}
			if (connection != null) {
				connection.close();
			}
		}

	}
}

个人理解方面：

1、通讯前会建立一次连接，拿到connection对象，可重复使用，也可立即关闭。使用时connection.createChannel()即可，不需重复使用时，用完记得关闭Channel。

2、生产者短连接，Channel用完即关闭。

3、消费者长连接，Channel处于监听，生产者用完Channel即可关闭。

4、可在容器启动时，消费者注册到监听器。