ActiveMQ实际应用实例

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本文介绍了一个结合Spring、SpringMVC与ActiveMQ实现的下单模拟系统。该系统通过发送客户ID到ActiveMQ，由消费者监听并处理，完成从购物车生成订单、更新库存等一系列操作。

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前提

本例子是模拟下订单的，结合 Spring、SpringMVC 整合的 ActiveMQ。

MySQL 表结构及数据

CREATE TABLE `tb_cart` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `goods_id` int(11) NOT NULL COMMENT '商品 id',
  `goods_quantity` int(11) NOT NULL COMMENT '商品数量',
  `goods_price` int(11) NOT NULL COMMENT '价格',
  `customer_id` int(11) NOT NULL COMMENT '用户 id',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
INSERT INTO `tb_cart` VALUES ('1', '1', '1', '10', '1');
CREATE TABLE `tb_customer` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(20) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
INSERT INTO `tb_customer` VALUES ('1', 'yz');
CREATE TABLE `tb_goods` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(20) NOT NULL COMMENT '商品名称',
  `price` int(11) NOT NULL COMMENT '价格',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
INSERT INTO `tb_goods` VALUES ('1', '旺仔小馒头', '10');
CREATE TABLE `tb_order` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `customer_id` int(11) NOT NULL COMMENT '顾客 id',
  `create_date` date NOT NULL COMMENT '创建时间',
  `total_money` int(11) NOT NULL COMMENT '总价',
  `status` int(1) NOT NULL COMMENT '状态',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1131 DEFAULT CHARSET=utf8;
CREATE TABLE `tb_stock` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `goods_id` int(11) NOT NULL COMMENT '商品 id',
  `stock` int(11) NOT NULL COMMENT '库存',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
INSERT INTO `tb_stock` VALUES ('1', '1', '1000');

jar 包

<!-- 除了 Spring 及 SpringMVC 依赖的 jar 包，这里只是 activemq 的 jar 包，也没有使用 Spring 提供的 JMSTemplate -->
<dependency>
    <groupId>org.apache.activemq</groupId>
    <artifactId>activemq-pool</artifactId>
    <version>5.9.0</version>
</dependency>
<dependency>
    <groupId>org.apache.activemq</groupId>
    <artifactId>activemq-all</artifactId>
    <version>5.10.0</version>
</dependency>
<dependency>
    <groupId>org.apache.geronimo.specs</groupId>
    <artifactId>geronimo-servlet_3.0_spec</artifactId>
    <version>1.0</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>org.apache.geronimo.specs</groupId>
    <artifactId>geronimo-jms_1.1_spec</artifactId>
    <version>1.1.1</version>
</dependency>

demo

消息发送者，将客户 id 发送到 activemq 中

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Session;
import org.apache.activemq.ActiveMQConnectionFactory;

public class QueueSender{
    private static ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://182.254.246.166:61616");
    public static void sendMsg(int customerId) {
        Connection connection = null;
        Session session = null;
        try {
            connection = connectionFactory.createConnection();
            connection.start();
            session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
            Destination destination = session.createQueue("order-queue");
            MessageProducer producer = session.createProducer(destination);
            producer.send(session.createTextMessage(customerId + ""));
            session.commit();
        } catch (JMSException e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != session) {
                    session.close();
                }
                if (null != connection) {
                    connection.close();
                }
            } catch (JMSException e) {
                e.printStackTrace();
            }
        }
    }
}

消息消费者，通过客户 id 查询购物车信息、生成订单、删除购物车、减库存

import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Service;
import org.springframework.web.context.support.WebApplicationContextUtils;
import com.alibaba.fastjson.JSON;
import com.p7.framework.entity.Order;
import com.p7.framework.service.CartService;
import com.p7.framework.service.OrderService;
import com.p7.framework.service.StockService;

/**
 * 
 * 消息消费者实现 监听，使服务启动时，立即调用 consumeMsg 方法
 */
@Service
public class QueueReceive implements ServletContextListener {
    @Autowired
    private OrderService orderService;
    @Autowired
    private StockService stockService;
    @Autowired
    private CartService cartService;
    private static ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://182.254.246.166:61616");
    public void consumeMsg() {
        // 创建 10 个线程，run 方法中使用 activemq 的监听模式，使线程保持监听而不会销毁
        for (int i = 0; i < 10; i++) {
            new OrderThread(orderService, stockService, cartService, connectionFactory).start();
        }
    }
    @Override
    public void contextDestroyed(ServletContextEvent sce) {

    }
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(sce.getServletContext());
        QueueReceive bean = (QueueReceive) context.getBean("queueReceive");
        bean.consumeMsg();
    }
}
/**
 *
 * 模拟并发
 */
class OrderThread extends Thread {
    private OrderService orderService;
    private StockService stockService;
    private CartService cartService;
    private ConnectionFactory connectionFactory;

    public OrderThread(OrderService orderService, StockService stockService, CartService cartService,
            ConnectionFactory connectionFactory) {
        this.cartService = cartService;
        this.orderService = orderService;
        this.stockService = stockService;
        this.connectionFactory = connectionFactory;
    }

    @Override
    public void run() {

        System.out.println(Thread.currentThread().getName() + "------");
        Connection connection = null;
        final Session session;

        try {
            connection = connectionFactory.createConnection();
            connection.start();
            session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
            Destination destination = session.createQueue("order-queue");
            MessageConsumer consumer = session.createConsumer(destination);
            consumer.setMessageListener(new MessageListener() {

                @Override
                public void onMessage(Message message) {
                    try {
                        TextMessage msg = (TextMessage) message;
                        String customerId = msg.getText();
                        session.commit();

                        System.out.println(Thread.currentThread().getName() + "------处理时间：" + JSON.toJSON(new Date()));
                        List<Map<String, Object>> cartList = cartService.findByCustomerId(customerId);
                        Map<String, Integer> goodsNumMap = new HashMap<String, Integer>();
                        int totalMoney = 0;
                        for (Map<String, Object> map : cartList) {
                            totalMoney += Integer.parseInt(map.get("goods_price").toString())
                                    * Integer.parseInt(map.get("goods_quantity").toString());
                            goodsNumMap.put(map.get("goods_id").toString(),
                                    Integer.parseInt(map.get("goods_quantity").toString()));
                        }
                        // 创建订单
                        Order order = new Order(Integer.parseInt(customerId), new Date(), totalMoney, 1);
                        orderService.createOrder(order);
                        // 减库存，这里的锁一定要使用库存那个对象，如果不使用锁，那么并发时，减库存有问题
                        synchronized (stockService) {
                            for (String key : goodsNumMap.keySet()) {
                                stockService.decrease(key, goodsNumMap.get(key));
                            }
                        }
                        // 删除购物车，这里是为了使用同一条数据模拟并发，因此不删除购物车数据
                        // cartService.deleteByCustomerId(customerId);
                    } catch (JMSException e) {
                    }
                }
            });
        } catch (JMSException e) {
        } finally {
        }
    }
}

web.xml

<!-- spring 的监听器 -->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:config/spring/applicationContext.xml</param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 消息消费者的监听器 -->
<listener>
    <listener-class>com.p7.framework.ordermq.QueueReceive</listener-class>
</listener>

购物车 code

/** 接口 */
import java.util.List;
import java.util.Map;
public interface CartService {
    /**
     * 根据客户 id 查询购物车信息
     * @param customerId
     * @return
     */
    List<Map<String, Object>> findByCustomerId(String customerId);
    /**
     * 根据客户 id 删除购物车信息
     * @param customerId
     */
    void deleteByCustomerId(String customerId);
}

/** 接口实现 */
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.stereotype.Service;

import com.p7.framework.service.CartService;

@Service
public class CartServiceImpl implements CartService {
    @Autowired
    private NamedParameterJdbcTemplate jdbcTemplate;
    @Override
    public List<Map<String, Object>> findByCustomerId(String customerId) {
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("customerId", customerId);
        List<Map<String, Object>> resultList = jdbcTemplate
                .queryForList("select * from tb_cart where customer_id=:customerId", params);
        return resultList;
    }
    @Override
    public void deleteByCustomerId(String customerId) {
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("customerId", customerId);
        jdbcTemplate.update("delete from tb_cart where customer_id=:customerId ", params);
    }
}

订单 code

/** 接口 */
import com.p7.framework.entity.Order;
public interface OrderService {
    void createOrder(Order order);
}

/** 接口实现 */
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.stereotype.Service;
import com.p7.framework.entity.Order;
import com.p7.framework.service.OrderService;
@Service
public class OrderServiceImpl implements OrderService {
    @Autowired
    private NamedParameterJdbcTemplate jdbcTemplate;
    @Override
    public void createOrder(Order order) {
        Map<String, Object> map = order.toMap();
        jdbcTemplate.update(
                "insert into tb_order(customer_id,create_date,total_money,status) values(:customer_id , :create_date , :total_money , :status )",
                map);
    }
}

库存 code

/** 接口 */
package com.p7.framework.service;
public interface StockService {
    void decrease(String goodsId, int num);
}
/** 接口实现 */
import java.util.HashMap;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.stereotype.Service;
import com.p7.framework.service.StockService;
@Service
public class StockServiceImpl implements StockService {
    @Autowired
    private NamedParameterJdbcTemplate jdbcTemplate;
    @Override
    public void decrease(String goodsId, int num) {
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("goodsId", goodsId);
        Map<String, Object> resultMap = jdbcTemplate.queryForMap("select stock from tb_stock where goods_id=:goodsId ",
                params);
        Integer stock = Integer.parseInt(resultMap.get("stock").toString());
        params.put("stock", stock - num);
        jdbcTemplate.update("update tb_stock set stock=:stock where goods_id=:goodsId ", params);
    }
}