1.rabbitmq消息监听，兼容多种模式的消息，fanout/topic等模式

MQ消息配置监听：

package com.test.ddyin.conf;import java.util.HashMap;
import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Collectors;import org.apache.poi.ss.formula.functions.T;
import org.springframework.amqp.core.AbstractExchange;
import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.Binding.DestinationType;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.Exchange;
import org.springframework.amqp.core.FanoutExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.core.TopicExchange;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
import org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import com.qf.openchannel.mq.MQMessageAware;
import com.qf.openchannel.mq.MQReceiver;@Configuration
@ConditionalOnProperty(prefix = "spring.rabbitmq", name = "enable", matchIfMissing = false)
public class MQInitConfig {private final String queueNameSufix = ".test.channel";@Autowiredprivate List<MQMessageAware> messageListeners;@BeanList<Queue> queue() {return messageListeners.stream().map(listener -> {return new Queue(listener.getExchange() + queueNameSufix, false);}).collect(Collectors.toList());}@BeanList<Exchange> exchange() {return messageListeners.stream().map(listener -> {return new AbstractExchange(listener.getExchange()) {@Overridepublic String getType() {return listener.getMQType();}};}).collect(Collectors.toList());}@BeanList<Binding> binding() {return messageListeners.stream().map(listener -> {return new Binding(listener.getExchange() + queueNameSufix, DestinationType.QUEUE, listener.getExchange(),listener.getRoutingKey(), new HashMap<String, Object>());}).collect(Collectors.toList());}@BeanSimpleMessageListenerContainer container(ConnectionFactory connectionFactory,MessageListenerAdapter listenerAdapter) {SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();container.setConnectionFactory(connectionFactory);container.setMessageListener(listenerAdapter);messageListeners.forEach(listener -> {container.addQueueNames(listener.getExchange() + queueNameSufix);});return container;}@BeanMessageListenerAdapter listenerAdapter(MQReceiver receiver) {return new MessageListenerAdapter(receiver);}
}

注意：在绑定的时候，要加入exchange和routing key（fanout模式的routing key 为空字符串），其中，在queue，exchange和binding加注解，相当于是在容器中添加了exchange，队列和两者之间的绑定关系，可以直接从applicationContext中获取，其中，也是自动创建了exchange，queue以及两者之间的绑定关系，不需要在rabbitmq界面重新添加exchange，queue以及两者的绑定关系。

MQ消息接收：(MQReceiver)

package com.qf.openchannel.mq;import java.util.HashMap;
import java.util.Map;import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageListener;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.stereotype.Service;import com.qf.openchannel.util.Constant;
import com.qf.openchannel.util.LoggerUtil;@Service
public class MQReceiver implements MessageListener, ApplicationContextAware, ApplicationListener<ContextRefreshedEvent> {private final String queueNameSufix = ".test.channel";private ApplicationContext applicationContext;private Map<String, MQMessageAware> messageListener = new HashMap<>();@Overridepublic void onMessage(Message message) {String payload = new String(message.getBody());LoggerUtil.info("Received <" + payload + ">");try {          String exchange = message.getMessageProperties().getConsumerQueue();String routingKey = message.getMessageProperties().getReceivedRoutingKey();LoggerUtil.info("MQReceiverService onMessage routingKey {} exchange {}", routingKey,exchange);if (messageListener.containsKey(exchange)) {if(messageListener.containsKey(routingKey)) {messageListener.get(routingKey).onMessage(payload);}else {messageListener.get(exchange).onMessage(payload);}} else {LoggerUtil.info("MQReceiverService receiveMessage unrecognized message from exchange : ", exchange);}} catch (Exception e) {LoggerUtil.error("MQReceiverService receiveMessage exception: ", e);}}@Overridepublic void onApplicationEvent(ContextRefreshedEvent event) {applicationContext.getBeansOfType(MQMessageAware.class).forEach((key, listener) -> {if(listener.getMQType().equals(Constant.MQTYPE_TOPIC)) {LoggerUtil.info("MQReceiverService receiveMessage messageType {} routingKey {} exchange {}", listener.getMQType(), listener.getRoutingKey(),listener.getExchange());messageListener.put(listener.getExchange() + queueNameSufix, listener);messageListener.put(listener.getRoutingKey(), listener);}else if(listener.getMQType().equals(Constant.MQTYPE_FANOUT)){LoggerUtil.info("MQReceiverService receiveMessage messageType {} routingKey {} exchange {}", listener.getMQType(), listener.getRoutingKey(),listener.getExchange());messageListener.put(listener.getExchange() + queueNameSufix, listener);}else {}});}@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {this.applicationContext = applicationContext;}
}

注意：区分不同消息类型来绑定不同的监听，对于topic模式，routing key也要绑定对应的listener（监听器），然后通过message可获取监听的exchange和routing key

对于监听器，由于有多个监听，抽象出一个共同接口：

MQMessageAware

package com.test.ddyin.mq;public interface MQMessageAware {String getExchange();void onMessage(String message);String getMQType();String getRoutingKey();
}

然后对于不同的监听可手动实现：

例如：退团消息的监听：

package com.test.ddyin.mq;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import com.fasterxml.jackson.databind.ObjectMapper;
import com.qf.openchannel.model.QuitPlan;
import com.qf.openchannel.service.QuitPlanService;
import com.qf.openchannel.util.Constant;
import com.qf.openchannel.util.DateUtil;
import com.qf.openchannel.util.LoggerUtil;/*** @author ddyin* @date 2017年9月8日 下午14:08:34*/
@Service
public class QuitPlanListener implements MQMessageAware{@AutowiredQuitPlanService quitPlanService;@Overridepublic String getExchange() {return "trade.topic.notification";}@Overridepublic void onMessage(String message) {try {LoggerUtil.info("QuitPlanListener dealMessage start: {}", DateUtil.get14Date());ObjectMapper mapper = new ObjectMapper();QuitPlan quitPlan = mapper.readValue(message, QuitPlan.class);quitPlanService.insertQuitPlan(quitPlan);LoggerUtil.info("QuitPlanListener dealMessage end: {}", DateUtil.get14Date());} catch (Exception e) {LoggerUtil.error("QuitPlanListener.onMessage Exception:{}", e);}}@Overridepublic String getMQType() {return Constant.MQTYPE_TOPIC;}@Overridepublic String getRoutingKey() {return "trade.plan.status.settled";}}

到此，rabbitmq监听可实现不同消息类型的监听。

注意项目中rabbitmq的配置：

rabbitmq:host: 6.6.6.6port: 5674username: testpassword: testvirtual-host: /testenable: false

综述，end

补充:

如果想扩展到多个virtualHost，可以添加ConnectionFactory

其中配置的virtualHost配置在配置文件中，目的是区分对接不同的业务，通过virtualHost来进行隔离。

事例如下:(放置在MqInitConfig.java文件中)

    /*** virtual-host: /host1 ConnectionFactory** @return*/@BeanConnectionFactory connectionFactory1() {com.rabbitmq.client.ConnectionFactory connectionFactory = new com.rabbitmq.client.ConnectionFactory();connectionFactory.setHost(mqConfig.getHost());connectionFactory.setPort(mqConfig.getPort());connectionFactory.setUsername(mqConfig.getUsername());connectionFactory.setPassword(mqConfig.getPassword());connectionFactory.setVirtualHost(mqConfig.getVirtualHost1());CachingConnectionFactory factory = new CachingConnectionFactory(connectionFactory);return factory;}/*** virtual-host: /host2 ConnectionFactory** @return*/@BeanConnectionFactory connectionFactory2() throws IOException, TimeoutException {com.rabbitmq.client.ConnectionFactory connectionFactory = new com.rabbitmq.client.ConnectionFactory();connectionFactory.setHost(mqConfig.getHost());connectionFactory.setPort(mqConfig.getPort());connectionFactory.setUsername(mqConfig.getUsername());connectionFactory.setPassword(mqConfig.getPassword());connectionFactory.setVirtualHost(mqConfig.getVirtualHost2());CachingConnectionFactory factory = new CachingConnectionFactory(connectionFactory);return factory;}

添加完之后将多个virtualHost加入到SimpleRoutingConnectionFactory

@BeanConnectionFactory connectionFactory() {SimpleRoutingConnectionFactory factory = new SimpleRoutingConnectionFactory();Map<Object, ConnectionFactory> targetConnectionFactories = new HashMap<>();targetConnectionFactories.put("connectionFactory1", connectionFactory1());try {targetConnectionFactories.put("connectionFactory2", connectionFactory2());} catch (IOException e) {LoggerUtil.error("connectionFactory targetConnectionFactories IOException: {}", e);} catch (TimeoutException e) {LoggerUtil.error("connectionFactory targetConnectionFactories TimeoutException: {}", e);}factory.setTargetConnectionFactories(targetConnectionFactories);return factory;}

可以将对应的connectionFactory添加到container中，通过virtualHost来进行区分。

    @BeanSimpleMessageListenerContainer container(ConnectionFactory connectionFactory,MessageListenerAdapter listenerAdapter) {SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();container.setConnectionFactory(connectionFactory);container.setMessageListener(listenerAdapter);messageListeners.forEach(listener -> {if (MQ_RABBIT_VIRTUAL_HOST2.equals(listener.getVirtualHost())) {container.addQueueNames(listener.getExchange() + queueNameSufix);}else{//container.addQueueNames(listener.getExchange() + queueNameSufix);//或者其他业务逻辑}});return container;}

当然也要在MQMessageAware接口中添加方法：

public interface MQMessageAware {String getExchange();void onMessage(String message);String getMQType();String getRoutingKey();String getVirtualHost();
}

可实现多种virtualHost多种配置。。。

补充:

1.当消费者消费信息出现异常时，比如消费者宕机，消息该如何处理，当生产者宕机时，消息该如何处理?

A:对于消费者宕机，rabbitmq提供ack机制，当ack机制设置成true的时候，说明是生产者已经接收到消费者已经完全消费了信息，就会删除掉已经消费掉的信息。

对于生产者宕机，rabbitmq提供了持久化机制，这里的持久化包含了exchange，queue，message的持久化，MessageDeliveryMode的deliveryMode可设置是否持久化，新建exchange和queue的时候也可设置，持久化属性是durable。

2.如何确认消息是否已发送到broker代理服务器上(broker其实就是一个消息队列的服务器实体，包含exchange，queue和binding的信息)

A：方式一:消息队列的channel的confirm模式是针对消息还未到达broker服务器做的一个弥补机制，channel设置成confirm模式后，就可以在到达broker服务器时发送一个反馈(每个消息在发送到broker服务器时都有一个唯一ID)

方式二:消息队列是基于AMQP协议的，通过AMQP协议的事务机制来实现，是基于AMQP协议层面的解决方案。其实就是Channel中的txSelect()，txCommit()和txRollBack()