RabbitMQ之Direct exchange

在上面这张图中，我们可以看到X绑定了两个队列，绑定类型是direct。队列Q1绑定键为orange,队列Q2绑定键有两个：一个绑定键为black,另一个绑定键为green.
在这种绑定情况下，生产者发布消息到exchange上，绑定键为orange的消息会被发布到队列Q1。绑定键为black和green的消息会被发布到队列Q2,其他类型的消息将被丢弃。

生产者：

package com.atguigu.rabbitmq.six;

import com.atguigu.rabbitmq.utils.RabbitMqUtils;
import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.Channel;

import java.util.HashMap;
import java.util.Map;

public class EmitLogDirect {
 private static final String EXCHANGE_NAME = "direct_logs";
 public static void main(String[] argv) throws Exception {
        try (Channel channel = RabbitMqUtils.getChannel()) {
          channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.DIRECT);
               //创建多个 bindingKey
           Map<String, String> bindingKeyMap = new HashMap<>();
           bindingKeyMap.put("info","普通 info 信息");
           bindingKeyMap.put("warning","警告 warning 信息");
           bindingKeyMap.put("error","错误 error 信息");
           //debug 没有消费这接收这个消息 所有就丢失了
            bindingKeyMap.put("debug","调试 debug 信息");
              for (Map.Entry<String, String> bindingKeyEntry: bindingKeyMap.entrySet()){
                String bindingKey = bindingKeyEntry.getKey();
                String message = bindingKeyEntry.getValue();
                channel.basicPublish(EXCHANGE_NAME,bindingKey, null,
                 message.getBytes("UTF-8"));
                System.out.println("生产者发出消息:" + message);
         }
     }
    }
}

消费者1

package com.atguigu.rabbitmq.six;

import com.atguigu.rabbitmq.utils.RabbitMqUtils;
import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.DeliverCallback;
import org.apache.commons.io.FileUtils;

import java.io.File;

public class ReceiveLogsDirect01 {

    private static final String EXCHANGE_NAME = "direct_logs";

    public static void main(String[] args) throws Exception {
        Channel channel = RabbitMqUtils.getChannel();
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.DIRECT);
        String queueName="disk";
        channel.queueDeclare(queueName,false,false,false,null);
        channel.queueBind(queueName,EXCHANGE_NAME,"error");

        System.out.println("等待接收消息");
        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            message="接收绑定键:"+delivery.getEnvelope().getRoutingKey()+",消息:"+message;
            File file = new File("C:\\work\\rabbitmq_info.txt");
            FileUtils.writeStringToFile(file,message,"UTF-8");
            System.out.println("错误日志已经接收");
        };
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> {
        });
    }

}

消费者2

package com.atguigu.rabbitmq.six;

import com.atguigu.rabbitmq.utils.RabbitMqUtils;
import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.DeliverCallback;

public class ReceiveLogsDirect02 {
    private static final String EXCHANGE_NAME = "direct_logs";
    public static void main(String[] argv) throws Exception {
        Channel channel = RabbitMqUtils.getChannel();
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.DIRECT);
        String queueName = "console";
        channel.queueDeclare(queueName, false, false, false, null);
        channel.queueBind(queueName, EXCHANGE_NAME, "info");
        channel.queueBind(queueName, EXCHANGE_NAME, "warning");
        System.out.println("等待接收消息.....");
        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" 接收绑定键 :"+delivery.getEnvelope().getRoutingKey()+", 消息:"+message);
        };
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> {
        });
    }
}