rabbitMQ学习（二）

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();
        }
      }
    }
  }
}