用fanout的方式和java语言写一个发送和接收的示例

Sure, here is an example code for sending and receiving messages using fanout in Java:

import com.rabbitmq.client.*;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class FanoutExample {
    private static final String EXCHANGE_NAME = "fanout_example";

    public static void main(String[] argv) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, "fanout");
        String queueName = channel.queueDeclare().getQueue();
        channel.queueBind(queueName, EXCHANGE_NAME, "");

        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("Received message: " + message);
            }
        };
        channel.basicConsume(queueName, true, consumer);

        String message = "Hello, World!";
        channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes("UTF-8"));
        System.out.println("Sent message: " + message);

        channel.close();
        connection.close();
    }
}

Hope this helps! Let me know if you have any more questions.