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Direct類型的Exchange是不處理路由鍵,需要將一個隊列綁定到交換機上,要求該消息與一個特定的路由鍵完全匹配。這是一個完整的匹配。如果一個隊列綁定到該交換機上要求路由鍵爲 “logs”,則只有路由鍵爲“logs”的消息才被轉發,不會轉發路由鍵爲"logs.error",只會轉發路由鍵爲"logs"。
如下圖:
代碼實現如下!!
Consumer:
package direct;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Consumer;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;
public class DirectConsumer {
private static final String EXCHANGE_NAME = "exchange_direct";
public static void main(String[] argv) throws IOException, TimeoutException {
new ExchangeDirect("logs.info");
new ExchangeDirect("logs.error");
}
static class ExchangeDirect{
public ExchangeDirect(String routingKey) throws IOException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
//rabbitmq監聽IP
factory.setHost("192.168.249.128");
//rabbitmq監聽默認端口
factory.setPort(5672);
//設置訪問的用戶
factory.setUsername("test");
factory.setPassword("test");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
//聲明路由名字和類型
channel.exchangeDeclare(EXCHANGE_NAME, "direct", false, true, null);
//隊列名稱
String queueName = routingKey + ".queue";
//創建隊列
channel.queueDeclare(queueName, false, false, true, null);
//把隊列綁定到路由上
channel.queueBind(queueName, EXCHANGE_NAME, routingKey);
System.out.println(" [routingKey = "+ routingKey +"] Waiting for msg....");
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("[routingKey = "+ envelope.getRoutingKey() +"] Received msg is '" + message + "'");
}
};
channel.basicConsume(queueName, true, consumer);
}
}
}
Producer:
package direct;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
public class DirectProducer {
private static final String EXCHANGE_NAME = "exchange_direct";
public static void main(String[] argv) throws Exception{
new ExchangeDirect("logs.info", "logs Info test !!");
new ExchangeDirect("logs.error", "logs error test !!");
new ExchangeDirect("logs.warning", "logs warning test !!");
}
static class ExchangeDirect{
public ExchangeDirect(String routingKey,String message) throws IOException, TimeoutException{
ConnectionFactory factory = new ConnectionFactory();
//rabbitmq監聽IP
factory.setHost("192.168.249.128");
//rabbitmq監聽默認端口
factory.setPort(5672);
//設置訪問的用戶
factory.setUsername("test");
factory.setPassword("test");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
//聲明路由名字和類型
channel.exchangeDeclare(EXCHANGE_NAME, "direct", false, true, null);
channel.basicPublish(EXCHANGE_NAME, routingKey, null, message.getBytes());
System.out.println("[routingKey = "+routingKey+"] Sent msg is '" + message + "'");
channel.close();
connection.close();
}
}
}
運行結果:
注意這裏的queueName不能通過 channel.queueDeclare().getQueue() 來隨機生成!!
祝生活愉快!!!