import com.rabbitmq.client.*;
import java.io.IOException;
/**
* 消费消息，批量拒绝消息
* @author hxstrive.com
* @date 2022年2月17日13:59:29
*/
public class RejectMessage2 {
private static final String EXCHANGE_NAME = "exchange_" +
RejectMessage2.class.getSimpleName();
/**
* 发送消息
*/
private void sender() throws Exception {
// 创建连接
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("127.0.0.1");
factory.setPort(5672);
Connection connection = factory.newConnection();
// 创建通道
Channel channel = connection.createChannel();
channel.exchangeDeclare(EXCHANGE_NAME, "topic");
// 发送消息
System.out.println("[Send] Sending Message...");
for(int i = 1; i <= 5; i++) {
byte[] msg = ("hello wrold " + i).getBytes();
channel.basicPublish(EXCHANGE_NAME,
"www.hxstrive.com", null, msg);
System.out.println("[Send] msg = " + new String(msg));
}
// 释放资源
channel.close();
connection.close();
}
/**
* 消费消息
*/
private void consumer() throws Exception {
// 创建连接
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("127.0.0.1");
factory.setPort(5672);
Connection connection = factory.newConnection();
// 创建通道
final Channel channel = connection.createChannel();
channel.exchangeDeclare(EXCHANGE_NAME, "topic");
// 绑定exchange与queue
final String queueName = channel.queueDeclare().getQueue();
channel.queueBind(queueName, EXCHANGE_NAME, "*.hxstrive.com");
System.out.println("[Receive] Waiting Message...");
// 消费消息
channel.basicConsume(queueName, false, new DefaultConsumer(channel){
@Override
public void handleDelivery(String consumerTag, Envelope envelope,
AMQP.BasicProperties properties, byte[] body) throws IOException {
// 打印消息
String msg = new String(body);
System.out.println("[Receive] message = " + msg);
// 拒绝消息，不重新放入队列
if(msg.contains("5")) {
try {
Thread.sleep(10000);
// 批量拒绝前4个和当前消息
// 通过 RabbitMQ 管理界面观察
// Unacked 值为 5，等待 10 秒后 Unacked 为 0
System.out.println("[Receive] call channel.basicNack()");
channel.basicNack(envelope.getDeliveryTag(),
true, false);
} catch (Exception e) {
e.printStackTrace();
}
}
}
});
}
public static void main(String[] args) throws Exception {
RejectMessage2 demo = new RejectMessage2();
demo.consumer();
demo.sender();
}
}
