spring boot Rabbitmq集成,延时消息队列实现

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本篇主要记录Spring boot 集成Rabbitmq，分为两部分，第一部分为创建普通消息队列，第二部分为延时消息队列实现：

spring boot提供对mq消息队列支持amqp相关包，引入即可：

        <!-- rabbit mq -->          <dependency>              <groupId>org.springframework.boot</groupId>              <artifactId>spring-boot-starter-amqp</artifactId>          </dependency>

属性配置文件application.properties:

#rabbitmq  spring.rabbitmq.host=127.0.0.1  spring.rabbitmq.port=5672  spring.rabbitmq.username=root  spring.rabbitmq.password=root

RabbitMq配置类,配置连接工厂以及操作对象:

@Configuration  @ConfigurationProperties(prefix = "spring.rabbitmq")  public class RabbitMQConfiguration {      private static Logger logger = Logger.getLogger(RabbitMQConfiguration.class);      private String host;      private int port;      private String username;      private String password;      // 链接信息      @Bean      public ConnectionFactory connectionFactory() {          CachingConnectionFactory connectionFactory = new CachingConnectionFactory(host, port);          connectionFactory.setUsername(username);          connectionFactory.setPassword(password);          connectionFactory.setVirtualHost("/");          connectionFactory.setPublisherConfirms(true);          logger.info("Create ConnectionFactory bean ..");          return connectionFactory;      }      @Bean      @Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)      public RabbitTemplate rabbitTemplate() {          RabbitTemplate template = new RabbitTemplate(connectionFactory());          return template;      }      //省略getter setter  }

定义Service接口如下：
暂时不考虑延时队列，定义发送消息接口

/**  *   * @author victor  * @desc 消息队列服务接口  */  public interface IMessageQueueService {      /**      * 发送消息到队列      * @param queue 队列名称      * @param message 消息内容      */      public void send(String queueName,String message);  }

Service实现

package com.ks.server.service.impl.queue;  import org.springframework.amqp.AmqpException;  import org.springframework.amqp.core.Message;  import org.springframework.amqp.core.MessagePostProcessor;  import org.springframework.amqp.rabbit.core.RabbitTemplate;  import org.springframework.beans.factory.annotation.Autowired;  import org.springframework.stereotype.Service;  import com.base.common.codec.JSONUtils;  import com.ks.common.constant.MQConstant;  import com.ks.common.service.queue.IMessageQueueService;  import com.ks.modal.queue.DLXMessage;  /**  *   * @author victor  * @desc 消息队列服务接口实现  */  @Service("messageQueueService")  public class MessageQueueServiceImpl implements IMessageQueueService{      @Autowired      private RabbitTemplate rabbitTemplate;      @Override      public void send(String queueName, String msg) {          rabbitTemplate.convertAndSend(MQConstant.DEFAULT_EXCHANGE,queueName, msg);      }  }

相关常量类:

package com.ks.common.constant;  /**  *   * @author victor  * @desc Rabbit消息队列相关常量  */  public final class MQConstant {      private MQConstant(){      }      //exchange name      public static final String DEFAULT_EXCHANGE = "KSHOP";      //DLX QUEUE      public static final String DEFAULT_DEAD_LETTER_QUEUE_NAME = "kshop.dead.letter.queue";      //DLX repeat QUEUE 死信转发队列      public static final String DEFAULT_REPEAT_TRADE_QUEUE_NAME = "kshop.repeat.trade.queue";      //Hello 测试消息队列名称      public static final String HELLO_QUEUE_NAME = "HELLO";  }

到现在为止,队列相关配置，以及使用以及封装完成，接下来是创建队列，
这里我是单独创建一个配置类，用于队列配置，创建Hello队列示例如下:

package com.ks.ons.config;  import java.util.HashMap;  import java.util.Map;  import org.springframework.amqp.core.Binding;  import org.springframework.amqp.core.BindingBuilder;  import org.springframework.amqp.core.DirectExchange;  import org.springframework.amqp.core.Queue;  import org.springframework.context.annotation.Bean;  import org.springframework.context.annotation.Configuration;  import com.ks.common.constant.MQConstant;  /**  *   * @author victor  * @desc 队列配置  */  @Configuration  public class QueueConfiguration {      //信道配置      @Bean      public DirectExchange defaultExchange() {          return new DirectExchange(MQConstant.DEFAULT_EXCHANGE, true, false);      }      /*********************    hello 队列  测试    *****************/      @Bean      public Queue queue() {          Queue queue = new Queue(MQConstant.HELLO_QUEUE_NAME,true);          return queue;       }      @Bean      public Binding binding() {          return BindingBuilder.bind(queue()).to(defaultExchange()).with(MQConstant.HELLO_QUEUE_NAME);      }  }

通过配置队列bean，在程序启动时会在rabbitmq中创建相关队列，启动程序，可以在rabbtmq管理界面看到信道和队列信息:

众所周知，既然有了队列，用来处理业务的最终还是需要消费者，消费者创建示例如下:

package com.ks.ons.processor.hello;  import org.springframework.amqp.rabbit.annotation.RabbitHandler;  import org.springframework.amqp.rabbit.annotation.RabbitListener;  import org.springframework.stereotype.Component;  import com.ks.common.constant.MQConstant;  /**  *   * @author victor  * @desc hello 消息队列消费者  */  @Component  @RabbitListener(queues = MQConstant.HELLO_QUEUE_NAME)  public class HelloProcessor {      @RabbitHandler      public void process(String content) {          System.out.println("接受消息:" + content);      }  }

注入service

@Autowired  private IMessageQueueService messageQueueService;

发送消息

messageQueueService.send(MQConstant.HELLO_QUEUE_NAME, "测试发送消息");

接下来展示如何实现延时队列，在此之前如果读者像我一样对rabbitmq队列了解程度并不深入的话，–> 推荐文章，可以对rabbitmq延时队列实现思路有大概了解.
在本文中，主要是通过rabbitmq的DLX特性来实现发送延时队列：
思路如下：

这里写图片描述

客户端：指具体往MQ发生消息端，客户端将消息内容进行自定义包装，将消息中附带目标队列名称。如：客户端向队列Q1发送字符串“hello” , 延时时间为60秒，包装后修改为{“queueName”:”Q1”,”body”: “hello”}，此时，将消息发送到DLX死信队列，而非Q1队列，并将消息设置为60秒超时。

DLX：死信队列，用来存储有超时时间信息的消息，并且可以设置当消息超时时，转发到另一个指定队列(此处设置转发到router), 无消费者，当接收到客户端消息之后，等待消息超时，将消息转发到指定的Router队列

Router: 转发队列，用来接收死信队列超时消息，如上示例消息，在接收到之后，消费者将消息解析，获取queueName，body,再向所获取的queueName队列发送一条消息，内容为body.

Q1,Q2,Q3.：用户业务队列，当Q1收到hello，已经是60秒之后，再进行消费

修改上面代码，新增两个队列，
死信队列：存放发送的延时消息，
路由转发队列：用于接受死信消息死亡，并将消息转发到业务目标队列
修改之后代码如下：

/**  *   * @author victor  * @desc 队列配置  */  @Configuration  public class QueueConfiguration {      //信道配置      @Bean      public DirectExchange defaultExchange() {          return new DirectExchange(MQConstant.DEFAULT_EXCHANGE, true, false);      }      @Bean      public Queue repeatTradeQueue() {          Queue queue = new Queue(MQConstant.DEFAULT_REPEAT_TRADE_QUEUE_NAME,true,false,false);          return queue;       }      @Bean      public Binding  drepeatTradeBinding() {          return BindingBuilder.bind(repeatTradeQueue()).to(defaultExchange()).with(MQConstant.DEFAULT_REPEAT_TRADE_QUEUE_NAME);      }      @Bean      public Queue deadLetterQueue() {          Map<String, Object> arguments = new HashMap<>();          arguments.put("x-dead-letter-exchange", MQConstant.DEFAULT_EXCHANGE);          arguments.put("x-dead-letter-routing-key", MQConstant.DEFAULT_REPEAT_TRADE_QUEUE_NAME);          Queue queue = new Queue(MQConstant.DEFAULT_DEAD_LETTER_QUEUE_NAME,true,false,false,arguments);          System.out.println("arguments :" + queue.getArguments());          return queue;       }      @Bean      public Binding  deadLetterBinding() {          return BindingBuilder.bind(deadLetterQueue()).to(defaultExchange()).with(MQConstant.DEFAULT_DEAD_LETTER_QUEUE_NAME);      }      /*********************    hello 队列  测试    *****************/      @Bean      public Queue queue() {          Queue queue = new Queue(MQConstant.HELLO_QUEUE_NAME,true);          return queue;       }      @Bean      public Binding binding() {          return BindingBuilder.bind(queue()).to(defaultExchange()).with(MQConstant.HELLO_QUEUE_NAME);      }  }

修改Service服务：

package com.ks.common.service.queue;  /**  *   * @author victor  * @desc 消息队列服务接口  */  public interface IMessageQueueService {      /**      * 发送消息到队列      * @param queue 队列名称      * @param message 消息内容      */      public void send(String queueName,String message);      /**      * 延迟发送消息到队列      * @param queue 队列名称      * @param message 消息内容      * @param times 延迟时间 单位毫秒      */      public void send(String queueName,String message,long times);  }

package com.ks.server.service.impl.queue;  import org.springframework.amqp.AmqpException;  import org.springframework.amqp.core.Message;  import org.springframework.amqp.core.MessagePostProcessor;  import org.springframework.amqp.rabbit.core.RabbitTemplate;  import org.springframework.beans.factory.annotation.Autowired;  import org.springframework.stereotype.Service;  import com.base.common.codec.JSONUtils;  import com.ks.common.constant.MQConstant;  import com.ks.common.service.queue.IMessageQueueService;  import com.ks.modal.queue.DLXMessage;  /**  *   * @author victor  * @desc 消息队列服务接口实现  */  @Service("messageQueueService")  public class MessageQueueServiceImpl implements IMessageQueueService{      @Autowired      private RabbitTemplate rabbitTemplate;      @Override      public void send(String queueName, String msg) {          rabbitTemplate.convertAndSend(MQConstant.DEFAULT_EXCHANGE,queueName, msg);      }      @Override      public void send(String queueName, String msg, long times) {          DLXMessage dlxMessage = new DLXMessage(queueName,msg,times);          MessagePostProcessor processor = new MessagePostProcessor(){              @Override              public Message postProcessMessage(Message message) throws AmqpException {                  message.getMessageProperties().setExpiration(times + "");                  return message;              }          };          dlxMessage.setExchange(MQConstant.DEFAULT_EXCHANGE);          rabbitTemplate.convertAndSend(MQConstant.DEFAULT_EXCHANGE,MQConstant.DEFAULT_DEAD_LETTER_QUEUE_NAME, JSONUtils.toJson(dlxMessage), processor);      }  }

JSONUtils 为一个JSON工具类

新增消息实体，用于包装消息：

package com.ks.modal.queue;  import java.io.Serializable;  /**  *   * @author victor  * @desc rabbit 死信消息载体  */  public class DLXMessage implements Serializable {      private static final long serialVersionUID = 9956432152000L;      public DLXMessage() {          super();      }      public DLXMessage(String queueName, String content, long times) {          super();          this.queueName = queueName;          this.content = content;          this.times = times;      }      public DLXMessage(String exchange, String queueName, String content, long times) {          super();          this.exchange = exchange;          this.queueName = queueName;          this.content = content;          this.times = times;      }      private String exchange;      private String queueName;      private String content;      private long times;      //省略getter setter  }

路由转发队列消费者实现，负责接收超时消息，进行转发：

package com.ks.ons.processor.system;  import org.springframework.amqp.rabbit.annotation.RabbitHandler;  import org.springframework.amqp.rabbit.annotation.RabbitListener;  import org.springframework.beans.factory.annotation.Autowired;  import org.springframework.stereotype.Component;  import com.base.common.codec.JSONUtils;  import com.ks.common.constant.MQConstant;  import com.ks.common.service.queue.IMessageQueueService;  import com.ks.modal.queue.DLXMessage;  /**  *   * @author victor  * @desc 死信接收处理消费者  */  @Component  @RabbitListener(queues = MQConstant.DEFAULT_REPEAT_TRADE_QUEUE_NAME)  public class TradeProcessor {      @Autowired      private IMessageQueueService messageQueueService;      @RabbitHandler      public void process(String content) {          DLXMessage message = JSONUtils.toBean(content, DLXMessage.class);          messageQueueService.send(message.getQueueName(), message.getContent());      }  }

启动项目之后，管理界面如下:

测试代码片段：

messageQueueService.send(MQConstant.HELLO_QUEUE_NAME,"测试延迟发送消息",60000);

转自：http://blog.csdn.net/i_vic/article/details/72742277

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