RabbitMQ示例代码（二）
2.一个生产者（任务发布Task）多个消费者（完成任务Worker）模式
简单模型，使用默认exchange，发送到指定queue，一个发送者，多个接收者。
发送方-->(默认Exchange)-->Queue-->接收方1
|
--->接收方2
（1）生产者
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.MessageProperties;
public class Task {
private static final String TASK_QUEUE_NAME = "task_queue";
public static void main(String[] argv) throws Exception {
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("UTF-8"));
System.out.println(" [x] Sent '" + message + "'");
channel.close();
connection.close();
}
private static String getMessage(String[] strings) {
if (strings.length < 1) {
return "Hello World!";
}
return joinStrings(strings, " ");
}
private static String joinStrings(String[] strings, String delimiter) {
int length = strings.length;
if (length == 0) {
return "";
}
StringBuilder words = new StringBuilder(strings[0]);
for (int i = 1; i < length; i++) {
words.append(delimiter).append(strings[i]);
}
return words.toString();
}
}
（2）消费者
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();
}
}
}
}
}