一端发送，多端消费

发送端：

import java.io.IOException;

import com.rabbitmq.client.ConnectionFactory;

import com.rabbitmq.client.Connection;

import com.rabbitmq.client.Channel;

import com.rabbitmq.client.MessageProperties;

public class NewTask {

  private static final String TASK_QUEUE_NAME = "task_queue";

  public static void main(String[] argv)

                      throws java.io.IOException {

    ConnectionFactory factory = new ConnectionFactory();

    factory.setHost("localhost");

    Connection connection = factory.newConnection();

    Channel channel = connection.createChannel();

    channel.queueDeclare(TASK_QUEUE_NAME, true, false, false, null);

    String message = getMessage(argv);

    channel.basicPublish( "", TASK_QUEUE_NAME,

            MessageProperties.PERSISTENT_TEXT_PLAIN,

            message.getBytes());

    System.out.println(" [x] Sent '" + message + "'");

    channel.close();

    connection.close();

  }

  //...

}

　　接收端：

import com.rabbitmq.client.*;

import java.io.IOException;

public class Worker {

  private static final String TASK_QUEUE_NAME = "task_queue";

  public static void main(String[] argv) throws Exception {

    ConnectionFactory factory = new ConnectionFactory();

    factory.setHost("localhost");

    final Connection connection = factory.newConnection();

    final Channel channel = connection.createChannel();

    channel.queueDeclare(TASK_QUEUE_NAME, true, false, false, null);

    System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

    channel.basicQos(1);

    final 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 + "'");

        try {

          doWork(message);

        } finally {

          System.out.println(" [x] Done");

          channel.basicAck(envelope.getDeliveryTag(), false);

        }

      }

    };

    channel.basicConsume(TASK_QUEUE_NAME, false, consumer);

  }

  private static void doWork(String task) {

    for (char ch : task.toCharArray()) {

      if (ch == '.') {

        try {

          Thread.sleep(1000);

        } catch (InterruptedException _ignored) {

          Thread.currentThread().interrupt();

        }

      }

    }

  }

}