消息中间件系列六，rabbit与spring集成实战-低调大师

消息中间件系列六，rabbit与spring集成实战

2018-10-17 458

前言：这是中间件一个系列的文章之一，有需要的朋友可以看看这个系列的其他文章：
消息中间件系列一、消息中间件的基本了解
 消息中间件系列二、Windows下的activeMQ和rabbitMQ的安装
 消息中间件系列三、JMS和activeMQ的简单使用
 消息中间件系列四、认识AMQP和RabbiyMq的简单使用
 消息中间件系列五、rabbit消息的确认机制
 消息中间件系列六，rabbit与spring集成实战

本项目是rabbit和spring整合的实战学习项目，模拟电商下单和库存管理的过程，看过前面几篇博客的同学，相信这篇博客对你不会再难了。一些和本章学习不太相关的内容不会做过多说明，需要的朋友可以下载源码自己查看运行：rabbit与spring集成实战源码。

生产者订单系统

一、pom文件引入相关包

rabbit和spring整合以下两个包是必须的

    <dependency>
      <groupId>com.rabbitmq</groupId>
      <artifactId>amqp-client</artifactId>
      <version>5.0.0</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.amqp</groupId>
      <artifactId>spring-rabbit</artifactId>
      <version>2.0.0.RELEASE</version>
    </dependency>

其他包根据项目需要引进；引入的其他包有兴趣查看的可以下载源码查看。

二、配置文件

web.xml和spring-mvc.xml不是博客重点，不再贴出，有兴趣的下载源码查看；下面说明applicationContext.xml的内容:

1、配置文件中增加命名空间:

xmlns:rabbit="http://www.springframework.org/schema/rabbit"
http://www.springframework.org/schema/rabbit
http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd

1、连接工厂配置

    <!-- rabbitMQ配置 -->
    <bean id="rabbitConnectionFactory"
          class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
        <constructor-arg value="127.0.0.1"/>
        <property name="username" value="guest"/>
        <property name="password" value="guest"/>
        <property name="channelCacheSize" value="8"/>
        <property name="port" value="5672"></property>
        <!-- 发布确认必须配置在CachingConnectionFactory上 -->
        <property name="publisherConfirms" value="true"/>
    </bean>

2、`<rabbit:admin>`

配置<rabbit:admin>之后才能根据配置文件去生产队列交换器等信息。

<rabbit:admin connection-factory="rabbitConnectionFactory"/>

4、声明队列

durable：是否持久化

<rabbit:queue name="depot_queue" durable="true"/>

5、声明交换器

name：交换器名称，durable：是否持久化

    <rabbit:direct-exchange name="depot-amount-exchange"
          xmlns="http://www.springframework.org/schema/rabbit" durable="true">
        <rabbit:bindings>
            <rabbit:binding queue="depot_queue" key="amount.depot" ></rabbit:binding>
        </rabbit:bindings>
    </rabbit:direct-exchange>

6、队列和交换器进行绑定

queue：队列名称，key：绑定的路由键，需要在交换器中绑定。

        <rabbit:bindings>
            <rabbit:binding queue="depot_queue" key="amount.depot" ></rabbit:binding>
        </rabbit:bindings>

7、生产者端要声明RabbitmqTemplate

    <!-- 创建rabbitTemplate 消息模板类 -->
    <bean id="rabbitTemplate" class="org.springframework.amqp.rabbit.core.RabbitTemplate">
        <constructor-arg ref="rabbitConnectionFactory"></constructor-arg>
        <!--消息确认回调 -->
        <property name="confirmCallback" ref="confirmCallback"/>
        <property name="returnCallback" ref="sendReturnCallback"/>
    </bean>

完整的applicationContext.xml文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:task="http://www.springframework.org/schema/task"
       xmlns:rabbit="http://www.springframework.org/schema/rabbit"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
    http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
    http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
    http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd
    http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd">

     <!-- 配置扫描路径 -->
     <context:component-scan base-package="com.dongnaoedu">
         <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
     </context:component-scan>

    <!-- rabbitMQ配置 -->
    <bean id="rabbitConnectionFactory"
          class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
        <constructor-arg value="127.0.0.1"/>
        <property name="username" value="guest"/>
        <property name="password" value="guest"/>
        <property name="channelCacheSize" value="8"/>
        <property name="port" value="5672"></property>
        <!-- 发布确认必须配置在CachingConnectionFactory上 -->
        <property name="publisherConfirms" value="true"/>
    </bean>
    <rabbit:admin connection-factory="rabbitConnectionFactory"/>

    <rabbit:queue name="depot_queue" durable="true"/>

    <rabbit:direct-exchange name="depot-amount-exchange"
          xmlns="http://www.springframework.org/schema/rabbit" durable="true">
        <rabbit:bindings>
            <rabbit:binding queue="depot_queue" key="amount.depot" ></rabbit:binding>
        </rabbit:bindings>
    </rabbit:direct-exchange>

    <!-- 创建rabbitTemplate 消息模板类 -->
    <bean id="rabbitTemplate" class="org.springframework.amqp.rabbit.core.RabbitTemplate">
        <constructor-arg ref="rabbitConnectionFactory"></constructor-arg>
        <!--消息确认回调 -->
        <property name="confirmCallback" ref="confirmCallback"/>
    </bean>
</beans>

三、其他代码

1、controller

package com.dongnaoedu.controller;

import com.dongnaoedu.service.ProcessOrder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class OrderController {

    private Logger logger = LoggerFactory.getLogger(OrderController.class);
    private static final String SUCCESS = "suc";
    private static final String FAILUER = "failure";

    @Autowired
    private ProcessOrder processOrder;

    @RequestMapping("/order")
    public String userReg(){
        return "index";
    }

    @RequestMapping("/confirmOrder")
    @ResponseBody
    public String confirmOrder(@RequestParam("goodsId")String goodsId,
                           @RequestParam("amount")int amount){
        try {
            processOrder.processOrder(goodsId,amount);
            return SUCCESS;
        } catch (Exception e) {
            logger.error("订单确认异常！",e);
            return FAILUER;
        }
    }
}

2、ProcessOrder

package com.dongnaoedu.service;

import com.dongnaoedu.rpc.DepotService;
import com.dongnaoedu.rpc.RpcProxy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
import sun.security.x509.IPAddressName;

import java.net.InetSocketAddress;

@Service
public class ProcessOrder {
    private Logger logger = LoggerFactory.getLogger(ProcessOrder.class);

    @Autowired
    @Qualifier("mq")
    private IProDepot proDepot;

    public void processOrder(String goodsId,int amount){
        try {
            Thread.sleep(80);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        logger.info("--------------------["+goodsId+"]订单入库完成，准备变动库存！");
        proDepot.processDepot(goodsId,amount);

    }
}

3、MqMode

生产者可通过rabbitTemplate调用send方法发送消息，参数分别为exchange交换器，routingKey路由键，Message对象。

package com.dongnaoedu.service;

import com.dongnaoedu.vo.GoodTransferVo;
import com.google.gson.Gson;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageDeliveryMode;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

@Service
@Qualifier("mq")
public class MqMode  implements IProDepot {

    private final static String DEPOT_RK = "amount.depot";
    private final static String DEPOT_EXCHANGE = "depot-amount-exchange";

    @Autowired
    RabbitTemplate rabbitTemplate;

    private static Gson gson = new Gson();

    public void processDepot(String goodsId, int amount) {
        GoodTransferVo goodTransferVo = new GoodTransferVo();
        goodTransferVo.setGoodsId(goodsId);
        goodTransferVo.setChangeAmount(amount);
        goodTransferVo.setInOrOut(false);
        String goods = gson.toJson(goodTransferVo);
        MessageProperties messageProperties = new MessageProperties();
        messageProperties.setDeliveryMode(MessageDeliveryMode.PERSISTENT);//设置消息属性以便进行消息持久化，投递模式设置为2，
        rabbitTemplate.send(DEPOT_EXCHANGE, DEPOT_RK,new Message(goods.getBytes(), messageProperties));
    }
}

4、ConfirmCallback

消息的确认回调，必须实现RabbitTemplate.ConfirmCallback接口

package com.dongnaoedu.service.callback;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.support.CorrelationData;
import org.springframework.stereotype.Service;

@Service
public class ConfirmCallback implements RabbitTemplate.ConfirmCallback {
    private Logger logger = LoggerFactory.getLogger(ConfirmCallback.class);

    public void confirm(CorrelationData correlationData, boolean ack, String cause) {
        if (ack) {
            logger.info("消息确认发送给mq成功");
        } else {
            //处理失败的消息
            logger.info("消息发送给mq失败,考虑重发:"+cause);
        }
    }
}

消费者库存系统

一、配置文件

其他配置文件可下载源码查看。
applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:task="http://www.springframework.org/schema/task"
       xmlns:rabbit="http://www.springframework.org/schema/rabbit"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
    http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
    http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
    http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd
    http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd">

     <!-- 配置扫描路径 -->
     <context:component-scan base-package="com.dongnaoedu">
         <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
     </context:component-scan>

    <!-- rabbitMQ配置 -->
    <bean id="rabbitConnectionFactory"
          class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
        <constructor-arg value="127.0.0.1"/>
        <property name="username" value="guest"/>
        <property name="password" value="guest"/>
        <property name="channelCacheSize" value="8"/>
        <property name="port" value="5672"></property>
    </bean>
    <rabbit:admin connection-factory="rabbitConnectionFactory"/>

    <rabbit:queue name="depot_queue" durable="true"/>

    <rabbit:direct-exchange name="depot-amount-exchange"
          xmlns="http://www.springframework.org/schema/rabbit" durable="true">
        <rabbit:bindings>
            <rabbit:binding queue="depot_queue" key="amount.depot" ></rabbit:binding>
        </rabbit:bindings>
    </rabbit:direct-exchange>

    <!-- 对消息要手动确认 -->
    <rabbit:listener-container connection-factory="rabbitConnectionFactory"
                               acknowledge="manual">
        <rabbit:listener queues="depot_queue" ref="processDepot"
                         method="onMessage" />
    </rabbit:listener-container>
</beans>

二、其他源码

1、ProcessDepot

package com.dongnaoedu.mq;

import com.dongnaoedu.service.DepotManager;
import com.dongnaoedu.vo.GoodTransferVo;
import com.google.gson.Gson;
import com.rabbitmq.client.Channel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.core.ChannelAwareMessageListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;

@Service
public class ProcessDepot  implements ChannelAwareMessageListener {

    private static Logger logger = LoggerFactory.getLogger(ProcessDepot.class);

    @Autowired
    private DepotManager depotManager;

    private static Gson gson = new Gson();

    @Override
    public void onMessage(Message message, Channel channel) throws Exception {
        try {
            String msg = new String(message.getBody());
            logger.info(">>>>>>>>>>>>>>接收到消息:"+msg);
            GoodTransferVo goodTransferVo = gson.fromJson(msg,GoodTransferVo.class);
            try {
                depotManager.operDepot(goodTransferVo);
                channel.basicAck(message.getMessageProperties().getDeliveryTag(),
                        false);
                logger.info(">>>>>>>>>>>>>>库存处理完成，应答Mq服务");
            } catch (Exception e) {
                logger.error(e.getMessage());
                channel.basicNack(message.getMessageProperties().getDeliveryTag(),false,true);//deliveryTag投递的标记符，multiple是否进行批量回复，requeue是否重新入队分发消息
                logger.info(">>>>>>>>>>>>>>库存处理失败，拒绝消息，要求Mq重新派发");
                throw e;
            }
        } catch (Exception e) {
            logger.error(e.getMessage());
        }
    }
}

2、DepotManager

package com.dongnaoedu.service;

import com.dongnaoedu.vo.GoodTransferVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class DepotManager {

    @Autowired
    private Depot depot;

    public void operDepot(GoodTransferVo goodTransferVo){
        if(goodTransferVo.isInOrOut()){
            depot.inDepot(goodTransferVo.getGoodsId(),goodTransferVo.getChangeAmount());
        }else{
            depot.outDepot(goodTransferVo.getGoodsId(),goodTransferVo.getChangeAmount());
        }
    }

}

3、Depot

package com.dongnaoedu.service;

import com.dongnaoedu.rpc.DepotService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import javax.annotation.PostConstruct;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.BiFunction;

@Service
public class Depot {

    private static Logger logger = LoggerFactory.getLogger(Depot.class);

    private ConcurrentHashMap<String,Integer> goodsData =
            new ConcurrentHashMap<String, Integer>();

    @PostConstruct
    public void initDepot(){
        goodsData.put("001",1000);
        goodsData.put("002",500);
        goodsData.put("003",600);
        goodsData.put("004",700);
    }


    /*使用jdk1.8以下的用这个方法
    public synchronized void inDepot(String goodsId,int addAmout){
        int amount = goodsData.get(goodsId)+addAmout;
        goodsData.put(goodsId,amount);
    }
    */
    //增加库存
    public void inDepot(String goodsId,int addAmout){
        logger.info("+++++++++++++++++增加商品："+goodsId+"库存,数量为："+addAmout);
        int newValue = goodsData.compute(goodsId, new BiFunction<String, Integer, Integer>() {
            public Integer apply(String s, Integer integer) {
                return integer == null ? addAmout : integer + addAmout;
            }
        });
        logger.info("+++++++++++++++++商品："+goodsId+"库存,数量变为："+newValue);
    }

     /*使用jdk1.8以下的用这个方法
    public synchronized void outDepot(String goodsId,int reduceAmout){
        int amount = goodsData.get(goodsId)-reduceAmout;
        goodsData.put(goodsId,amount);
    }
    */
    //减少库存
    public void outDepot(String goodsId,int reduceAmout){
        logger.info("-------------------减少商品："+goodsId+"库存,数量为："+reduceAmout);
        int newValue = goodsData.compute(goodsId, new BiFunction<String, Integer, Integer>() {
            public Integer apply(String s, Integer integer) {
                return integer == null ? 0 : integer - reduceAmout;
            }
        });
        logger.info("-------------------商品："+goodsId+"库存,数量变为："+newValue);
    }

    public int getGoodsAmount(String goodsId){
        return goodsData.get(goodsId);
    }
}

补充：源码的rpc调用部分补在这里解释，有兴趣的朋友可以自行研究。源码链接：rabbit与spring集成实战源码。
目前rabbit的内容就先写到这里，rabbit集群和rpc的内容以后有时间在补充，接下来我会更新缓存系列，敬请期待。

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原文链接：https://yq.aliyun.com/articles/655049

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