spring rabbitmq 动态绑定exchange，routingkey，queue

一般单纯使用spring+rabbitmq或者单独使用rabbitmq时，查看下官网的demo应该问题不大，spring amqp封装rabbitmq之后，初始化， 发送，接收的代码变得更是简洁，只是配置项可能会多一些，如果是xml会有不少，假使是annotations会相对简单。

rabbitmq中有种exchange是topic，官网的示例图说的很清楚，在现实的业务中的话，服务端消息发送到绑定的exchange的时候，routingKey是根据不同业务的匹配规则动态生成，先撇开consumer端的消费来说，producer端获取数据并根据routingKey，发送到绑定的exchange时，这个过程很多情况下，是需要动态绑定生成的。

rabbitmq的原生api实现和spring amqp的api实现，我查了下相关资料，整理了下，关于动态绑定exchange，routingKey和queue的代码。值得注意，producer端在产生数据的时候，并不需要一定绑定一个或者多个queue；代码端展现如下：

rabbitmq的原生api：

channel.basicPublish(EXCHANGE_NAME, routingKey, null, message.getBytes());

spring amqp api：

amqpTemplate.convertAndSend("Hello World");

<pre name="code" class="java">rabbitTemplate.convertAndSend(exchange,routingKey,msg);

客户端在消费消息的时候，只需要跟exchange+routingKey建立连接，就可以获取对应的数据了。而接收这些数据的客户端队列需要一个queueName，这个在consumer接收的时候，是必须的。因此，这里我说，queue的名称对于producer是不重要的。（我自己的看法，若有错误，希望指出，谢谢）

当exchange的类型被指定为topic的时候，动态的绑定路由和分发数据，不管对producer还是consumer来说，都是比较重要的。这里，我主要贴一下spring amqp的api的动态绑定的代码，rabbitmq原生api也有，不过自己太懒，不愿意大家篇幅，太长了，自己都不愿意看下去..............

producer代码：

package org.springframework.amqp.helloworld.dynamic;import org.springframework.amqp.core.Exchange;import org.springframework.amqp.core.Queue;import org.springframework.amqp.core.TopicExchange;import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;import org.springframework.amqp.rabbit.connection.ConnectionFactory;import org.springframework.amqp.rabbit.core.RabbitAdmin;import org.springframework.amqp.rabbit.core.RabbitTemplate;import org.springframework.amqp.support.converter.JsonMessageConverter;/** * Created by Thinkpad on 2015/8/4  22:00. */public class ProducerConfiguration {    private String queueName;    private String routingKey;    private RabbitTemplate rabbitTemplate;    private String exchange;    public ProducerConfiguration() {    }    public ProducerConfiguration(String exchange,String queueName, String routingKey) {        this.queueName = queueName;        this.routingKey = routingKey;        this.exchange=exchange;        this.rabbitTemplate = rabbitTemplate();        RabbitAdmin admin = new RabbitAdmin(this.rabbitTemplate.getConnectionFactory());        admin.declareQueue(new Queue(this.queueName));        admin.declareExchange(new TopicExchange(exchange));//        admin.setAutoStartup(true);    }    public String getExchange() {        return exchange;    }    public void setExchange(String exchange) {        this.exchange = exchange;    }    public void setQueueName(String queueName) {        this.queueName = queueName;    }    public void setRoutingKey(String routingKey) {        this.routingKey = routingKey;    }    public String getQueueName() {        return queueName;    }    public String getRoutingKey() {        return routingKey;    }    public RabbitTemplate rabbitTemplate() {        RabbitTemplate template = new RabbitTemplate(connectionFactory());//The routing key is set to the name of the queue by the broker for the default exchange.        template.setRoutingKey(this.routingKey);//Where we will synchronously receive messages from        template.setQueue(this.queueName);//        template.setMessageConverter(new JsonMessageConverter());        return template;    }    public ConnectionFactory connectionFactory() {        CachingConnectionFactory connectionFactory = new CachingConnectionFactory("localhost");        connectionFactory.setUsername("guest");        connectionFactory.setPassword("guest");        return connectionFactory;    }    public void send(String s) {        this.rabbitTemplate.convertAndSend(s);    }    public void send(String exchange,String routingKey,Object msg) {        this.rabbitTemplate.convertAndSend(exchange,routingKey,msg);    }}

consumer代码：

package org.springframework.amqp.helloworld.dynamic;import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;import org.springframework.amqp.rabbit.connection.ConnectionFactory;import org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter;import org.springframework.amqp.support.converter.JsonMessageConverter;/** * Created by Thinkpad on 2015/8/4  22:05. */public class ConsumerConfig {    private String queueName;    private String routingKey;    private int onOfConsumer;    public int getOnOfConsumer() {        return onOfConsumer;    }    public void setOnOfConsumer(int onOfConsumer) {        this.onOfConsumer = onOfConsumer;    }    public String getQueueName() {        return queueName;    }    public void setQueueName(String queueName) {        this.queueName = queueName;    }    public String getRoutingKey() {        return routingKey;    }    public void setRoutingKey(String routingKey) {        this.routingKey = routingKey;    }    public ConsumerConfig(String queueName, String routingKey, int onOfConsumer) throws Exception {        this.queueName = queueName;        this.routingKey = routingKey;        this.onOfConsumer = onOfConsumer;        ConsumerSimpleMessageListenerContainer container = new ConsumerSimpleMessageListenerContainer();        container.setConnectionFactory(connectionFactory());        container.setQueueNames(this.queueName);        container.setConcurrentConsumers(this.onOfConsumer);        container.setMessageListener(new MessageListenerAdapter(new ConsumerHandler()));        container.startConsumers();    }    public ConnectionFactory connectionFactory() {        CachingConnectionFactory connectionFactory = new CachingConnectionFactory("localhost");        connectionFactory.setUsername("guest");        connectionFactory.setPassword("guest");        return connectionFactory;    }}

consumer的监听和handler：

package org.springframework.amqp.helloworld.dynamic;import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;/** * Created by Thinkpad on 2015/8/4  22:04. */public class ConsumerSimpleMessageListenerContainer extends SimpleMessageListenerContainer {    public void startConsumers() throws Exception {        super.doStart();    }}

package org.springframework.amqp.helloworld.dynamic;/** * Created by Thinkpad on 2015/8/4  22:05. */public class ConsumerHandler {    public void handleMessage(String text) {        System.out.println("Received--------------------------: " + text);    }}

最后是test：

package org.springframework.amqp.helloworld.dynamic;import java.util.concurrent.TimeUnit;/** * Created by Thinkpad on 2015/8/4  22:21. */public class Test {    public static void main(String[] args) throws InterruptedException, Exception {        ProducerConfiguration producer = new ProducerConfiguration("e1","q1", "q1");        ConsumerConfig consumer = new ConsumerConfig("q1", "q1", 5);        int cout = 0;        while (true) {            producer.send("Str: " + cout);            TimeUnit.SECONDS.sleep(2);            cout++;        }    }}

最后把我的demo工程代码发上来，demo是在spring amqp的官网demo上改动的，万般只是懒.......

http://download.csdn.net/detail/johnjobs/8960681 不需要积分