初识RabbitMq(三) 交换机

1fanout(广播)

这种模式只需要将队列绑定到交换机.上即可，是不需要设置路由键的，如图(生产者先将消息给交换机，然后交换机将消息全部发给队列。每个消费者接收到的消息一模一样(不会像之前一样将消息平均分配给消费者))

生产者代码

package item.com.fanout;

import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

public class EmitLog {
    //定义交换机名称
    private static final String EXCHANGE_NAME = "logs";

    public static void main(String[] args) throws Exception {
        //创建连接工厂
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("127.0.0.1");
        connectionFactory.setPassword("admin");
        connectionFactory.setUsername("admin");
        //创建一个连接
        Connection connection = connectionFactory.newConnection();
        //建立一个频道
        Channel channel = connection.createChannel();
        //交换声明  channel.exchangeDeclare(交换机名字，交换机类型)
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT);
        //发送消息
        for (int i = 0; i <10 ; i++) {
            String message=i+"";
          //  channel.basicPublish(交换机名称，routingKey,props,消息)
            channel.basicPublish(EXCHANGE_NAME,"",null,message.getBytes("UTF-8"));
        }
        channel.close();;
        connection.close();
    }
}

消费者代码(可写多个)

package item.com.fanout;
import com.rabbitmq.client.*;
import java.io.IOException;

public class ReceiveLogs1 {
    //定义交换机名称
    private static final String EXCHANGE_NAME = "logs";

    public static void main(String[] args) throws  Exception{
        //创建连接工厂
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setUsername("admin");
        connectionFactory.setPassword("admin");
        connectionFactory.setHost("127.0.0.1");
        //创建一个连接
        Connection connection = connectionFactory.newConnection();
        //建立一个频道
        Channel channel = connection.createChannel();
        //消息接收和队列绑定，不和交换机绑定
        //获取一个非持久的队列
        String queueName = channel.queueDeclare().getQueue();
        //将队列绑定到交换机上
        channel.queueBind(queueName,EXCHANGE_NAME,"");
        //  channel.queueBind(队列名称, 交换机名称, routingKey);

        Consumer consumer =  new DefaultConsumer(channel) {
//重写 handleDelivery   =》new handleDelivery然后回车
            @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("接收消息："+message);
            }
        };

        //消息消费
        channel.basicConsume(queueName, true, consumer);
        // channel.basicConsume(queueName, 是否制动接收, consumer);
    }
}

注意，先运行接收者然后在运行消息发送者，可以看到两个消费者接收到的消息一样

 2direct （不同消费者接收到不同消息）

根据RoutingKey匹配消息路由到指定的队列

首先-生产者代码。

package item.com.direct;

import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

public class EmitLogDirect {
    //定义交换机名称
    private static final String EXCHANGE_NAME = "direct_logs";

    public static void main(String[] args) throws  Exception{
        //创建连接工厂
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("127.0.0.1");
        connectionFactory.setPassword("admin");
        connectionFactory.setUsername("admin");
        //创建一个连接
        Connection connection = connectionFactory.newConnection();
        //建立一个频道
        Channel channel = connection.createChannel();
        //交换声明  channel.exchangeDeclare(交换机名字，交换机类型)
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.DIRECT);
        //定义不同的消息  =》根据 routingKey
        String message = "Hello World!";
        String severity = "info";//routingKey
        channel.basicPublish(EXCHANGE_NAME, severity, null, message.getBytes("UTF-8"));
        severity = "warning";
        channel.basicPublish(EXCHANGE_NAME, severity, null, message.getBytes("UTF-8"));
        severity = "error";
        channel.basicPublish(EXCHANGE_NAME, severity, null, message.getBytes("UTF-8"));
        channel.close();
        connection.close();
    }
}

生产者代码(此处代码接收了三个routingKey)

package item.com.direct;

import com.rabbitmq.client.*;
import java.io.IOException;

public class ReceiveLogsDirect1 {
    //定义交换机名称
    private static final String EXCHANGE_NAME = "direct_logs";

    public static void main(String[] args) throws Exception {
        //创建连接工厂
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("127.0.0.1");
        connectionFactory.setPassword("admin");
        connectionFactory.setUsername("admin");
        //创建一个连接
        Connection connection = connectionFactory.newConnection();
        //建立一个频道
        Channel channel = connection.createChannel();

        //交换声明  channel.exchangeDeclare(交换机名字，交换机类型)
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.DIRECT);

        //消息接收和队列绑定，不和交换机绑定
        //获取一个非持久的队列
        String queueName = channel.queueDeclare().getQueue();
        //将队列绑定到交换机上,一个交换机同时绑定三个queue
        channel.queueBind(queueName, EXCHANGE_NAME, "info");
        channel.queueBind(queueName, EXCHANGE_NAME, "warning");
        channel.queueBind(queueName, EXCHANGE_NAME, "error");

        Consumer consumer = new DefaultConsumer(channel) {
            //重写 handleDelivery   =》new handleDelivery然后回车
            @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 '" + envelope.getRoutingKey() + "':'" + message + "'");
            }
        };
        //消息消费
        channel.basicConsume(queueName,true,consumer);
        // channel.basicConsume(queueName, 是否制动接收, consumer);
    }
}

 3topic (direct升级)

和direct相比，多了模糊查询进行筛选，功能比direct更加强大

*可以代替一个单词
#可以替代零个或多个单词

 生产者代码

package item.com.topic;

import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

public class EmitLogTopic {
    //定义交换机名称
    private static final String EXCHANGE_NAME="topic_logs";

    public static void main(String[] args) throws  Exception {
        //创建连接工厂
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("127.0.0.1");
        connectionFactory.setUsername("admin");
        connectionFactory.setPassword("admin");
        //创建一个连接
        Connection connection = connectionFactory.newConnection();
        //建立一个频道
        Channel channel = connection.createChannel();
        //交换声明  channel.exchangeDeclare(交换机名字，交换机类型)
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);
        //定义不同的消息  =》根据 routingKey
        String message = "Animal World";
        //定义多个routingKey(路由键)
        String[] routingKeys = new String[9];
        routingKeys[0] = "quick.orange.rabbit";
        routingKeys[1] = "lazy.orange.elephant";
        routingKeys[2] = "quick.orange.fox";
        routingKeys[3] = "lazy.brown.fox";
        routingKeys[4] = "lazy.pink.rabbit";
        routingKeys[5] = "quick.brown.fox";
        routingKeys[6] = "orange";
        routingKeys[7] = "quick.orange.male.rabbit";
        routingKeys[8] = "lazy.orange.male.rabbit";

        //发送消息
        for (int i = 0; i <routingKeys.length ; i++) {
            channel.basicPublish(EXCHANGE_NAME,routingKeys[i],null,message.getBytes("UTF-8"));
        }

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

}

消费者代码1

package item.com.topic;

import com.rabbitmq.client.*;

import java.io.IOException;

public class ReceiveLogsTopic1 {
    private static final String EXCHANGE_NAME = "topic_logs";

    public static void main(String[] args) throws Exception {
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("127.0.0.1");
        connectionFactory.setUsername("admin");
        connectionFactory.setPassword("admin");
        Connection connection = connectionFactory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);
        String queueName = channel.queueDeclare().getQueue();

        //指定bindingKey
        String bindingKey1 = "*.*.rabbit";
        channel.queueBind(queueName, EXCHANGE_NAME, bindingKey1);
        String bindingKey2 = "lazy.#";
        channel.queueBind(queueName, EXCHANGE_NAME, bindingKey2);

        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 '" + envelope.getRoutingKey() + "':'" + message + "'");
            }
        };
        channel.basicConsume(queueName,true,consumer);
    }
}

消费者2代码

package item.com.topic;

import com.rabbitmq.client.*;

import java.io.IOException;

public class ReceiveLogsTopic2 {
    private static final String EXCHANGE_NAME = "topic_logs";

    public static void main(String[] args) throws Exception {
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("127.0.0.1");
        connectionFactory.setUsername("admin");
        connectionFactory.setPassword("admin");
        Connection connection = connectionFactory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);
        String queueName = channel.queueDeclare().getQueue();

        //指定bindingKey
        String bindingKey = "*.orange.*";
        channel.queueBind(queueName, EXCHANGE_NAME, bindingKey);

        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 '" + envelope.getRoutingKey() + "':'" + message + "'");
            }
        };
        channel.basicConsume(queueName,true,consumer);
    }
}

输出结果【根据routingKey 进行相应的模糊查询】