springboot 广播 抢单 springboot秒杀

文章前言

现在电商项目都有许多的秒杀活动，今天这一篇博客就是让大家，自己动手编程一个秒杀的过程，话不多说直接上手

所需工具

idea+redis+rabbitmq+Jmeter+RedisDesktopManager+tkmybatis

安装工具的路径

RabbitMQ安装教程>

Redis和RedisDesktopManager安装教程

Jmeter安装教程

数据库

数据库使用 mysql，下面是表结构

搭建项目

启动器 pom.xml

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.8.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>0.7.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
        </dependency>
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.0.3-beta1</version>
        </dependency>
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper</artifactId>
           <version>4.0.0</version>
        </dependency>
    </dependencies>

配置文件 application.properties

spring.devtools.restart.enabled=false
spring.datasource.username=root
spring.datasource.password=root
server.port=8443
spring.datasource.url=jdbc:mysql://localhost:3306/myredis?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC&allowMultiQueries=true
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest

spring.redis.host=localhost
spring.redis.port=6379 
spring.redis.jedis.pool.max-active=1024
spring.redis.jedis.pool.max-wait=-1s
spring.redis.jedis.pool.max-idle=200
spring.redis.password=123456

项目包目录

实体类（pojo） Order，Stock

因为本次数据库操作方面使用了tkmybatis框架，所以实体类我们需要用到JPA的注解，来实现映射关系

package com.example.myredis.pojo;

import lombok.Data;
import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import java.io.Serializable;

/**
 * 作者：**
 * 日期：2019/12/24 9:06
 */
@Data
@Table(name = "t_order")
public class Order implements Serializable {
    private static final long serialVersionUID = -8867272732777764701L;

    @Id
    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(name = "order_name")
    private String order_name;

    @Column(name = "order_user")
    private String order_user;
}

package com.example.myredis.pojo;

import lombok.Data;
import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import java.io.Serializable;

/**
 * 作者：**
 * 日期：2019/12/24 9:08
 */

@Table(name = "stock")
@Data
public class Stock implements Serializable {
    private static final long serialVersionUID = 2451194410162873075L;

    @Id
    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(name = "name")
    private String name;

    @Column(name = "stock")
    private Long stock;
}

mapper层

package com.example.myredis.mapper;

/**
 * 作者：**
 * 日期：2019/12/24 9:10
 */
import com.example.myredis.base.service.GenericMapper;
import com.example.myredis.pojo.Order;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface OrderMapper extends GenericMapper<Order> {
    void insertOrder(Order order);
}

package com.example.myredis.mapper;

/**
 * 作者：**
 * 日期：2019/12/24 9:11
 */
import com.example.myredis.base.service.GenericMapper;
import com.example.myredis.pojo.Stock;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface StockMapper extends GenericMapper<Stock> {
}

service层 （注：这里没有发接口，自己写一下）

package com.example.myredis.service.impl;

import com.example.myredis.mapper.OrderMapper;
import com.example.myredis.pojo.Order;
import com.example.myredis.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * 作者：**
 * 日期：2019/12/24 9:14
 */
@Service
public class OrderServiceImpl implements OrderService {
    @Autowired
    private OrderMapper orderMapper;
    @Override
    public void createOrder(Order order) {
        orderMapper.insert(order);
    }

}

package com.example.myredis.service.impl;

import com.example.myredis.mapper.StockMapper;
import com.example.myredis.pojo.Stock;
import com.example.myredis.service.StockSerivce;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import tk.mybatis.mapper.entity.Example;

import java.util.List;

/**
 * 作者：**
 * 日期：2019/12/24 9:14
 */
@Service
public class StockSerivceImpl implements StockSerivce {
    @Autowired
    private StockMapper stockMapper;
    // 秒杀商品后减少库存
    @Override
    public void decrByStock(String stockName) {
        Example example = new Example(Stock.class);
        Example.Criteria criteria = example.createCriteria();
        criteria.andEqualTo("name", stockName);
        List<Stock> stocks = stockMapper.selectByExample(example);
        if (!CollectionUtils.isEmpty(stocks)) {
            Stock stock = stocks.get(0);
            stock.setStock(stock.getStock() - 1);
            stockMapper.updateByPrimaryKey(stock);
        }
    }
    // 秒杀商品前判断是否有库存
    @Override
    public Integer selectByExample(String stockName) {
        Example example = new Example(Stock.class);
        Example.Criteria criteria = example.createCriteria();
        criteria.andEqualTo("name", stockName);
        List<Stock> stocks = stockMapper.selectByExample(example);
        if (!CollectionUtils.isEmpty(stocks)) {
            return stocks.get(0).getStock().intValue();
        }
        return 0;
    }
}

controller层（这里有俩种方式，一个纯数据库，一个redis，大家等下可以看看区别）

package com.example.myredis.controller;

import com.example.myredis.config.RabbitMQ;
import com.example.myredis.pojo.Order;
import com.example.myredis.service.OrderService;
import com.example.myredis.service.RedisService;
import com.example.myredis.service.StockSerivce;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * 作者：**
 * 日期：2019/12/24 9:23
 */
@Controller
@Slf4j
public class SecController {
    @Autowired
    private RabbitTemplate rabbitTemplate;
    @Autowired
    private RedisService redisService;
    @Autowired
    private OrderService orderService;
    @Autowired
    private StockSerivce stockService;
    /**
     * 使用redis+消息队列进行秒杀实现
     *
     * @param username
     * @param stockName
     * @return
     */
    @PostMapping( value = "/sec",produces = "application/json;charset=utf-8")
    @ResponseBody
    public String sec(@RequestParam(value = "username") String username, @RequestParam(value = "stockName") String stockName) {

        log.info("参加秒杀的用户是：{}，秒杀的商品是：{}", username, stockName);
        String message = null;
        //调用redis给相应商品库存量减一
        Long decrByResult = redisService.decrBy(stockName);
        if (decrByResult >= 0) {
            /**
             * 说明该商品的库存量有剩余，可以进行下订单操作
             */
            log.info("用户：{}秒杀该商品：{}库存有余，可以进行下订单操作",username, stockName);
            //发消息给库存消息队列，将库存数据减一
            rabbitTemplate.convertAndSend(RabbitMQ.STORY_EXCHANGE, RabbitMQ.STORY_ROUTING_KEY, stockName);

            //发消息给订单消息队列，创建订单
            Order order = new Order();
            order.setOrder_name(stockName);
            order.setOrder_user(username);
            rabbitTemplate.convertAndSend(RabbitMQ.ORDER_EXCHANGE, RabbitMQ.ORDER_ROUTING_KEY, order);
            message = "用户" + username + "秒杀" + stockName + "成功";
        } else {
            /**
             * 说明该商品的库存量没有剩余，直接返回秒杀失败的消息给用户
             */
            log.info("用户：{}秒杀时商品的库存量没有剩余,秒杀结束", username);
            message = "用户："+ username + "商品的库存量没有剩余,秒杀结束";
        }
        return message;
    }

    /**
     * 实现纯数据库操作实现秒杀操作
     * @param username
     * @param stockName
     * @return
     */
    @RequestMapping("/secDataBase")
    @ResponseBody
    public String secDataBase(@RequestParam(value = "username") String username, @RequestParam(value = "stockName") String stockName) {
        log.info("参加秒杀的用户是：{}，秒杀的商品是：{}", username, stockName);
        String message = null;
        //查找该商品库存
        Integer stockCount = stockService.selectByExample(stockName);
        log.info("用户：{}参加秒杀，当前商品库存量是：{}", username, stockCount);
        if (stockCount > 0) {
            /**
             * 还有库存，可以进行继续秒杀，库存减一,下订单
             */
            //1、库存减一
            stockService.decrByStock(stockName);
            //2、下订单
            Order order = new Order();
            order.setOrder_user(username);
            order.setOrder_name(stockName);
            orderService.createOrder(order);
            log.info("用户：{}.参加秒杀结果是：成功", username);
            message = username + "参加秒杀结果是：成功";
        } else {
            log.info("用户：{}.参加秒杀结果是：秒杀已经结束", username);
            message = username + "参加秒杀活动结果是：秒杀已经结束";
        }
        return message;
    }
}

配置tkmybatis的接口新建名为base得包，在base下面新建service

package com.example.myredis.base.service;

/**
 * 作者：**
 * 日期：2019/12/24 9:09
 */
import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;
public interface GenericMapper<T> extends Mapper<T>, MySqlMapper<T> {

}

新建config包，新建redis和RabbitMQ的类

编写RabbitMQ和redis得配置类

redis

package com.example.myredis.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

/**
 * 作者：**
 * 日期：2019/12/23 16:57
 */
@Configuration
public class Redis{
    // 配置redis得配置详解
    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
        template.setConnectionFactory(redisConnectionFactory);
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        template.setHashKeySerializer(new GenericJackson2JsonRedisSerializer());
        template.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
        template.afterPropertiesSet();
        return template;
    }
}

RabbitMQ

package com.example.myredis.config;

import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.amqp.support.converter.MessageConverter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.Exchange;
import org.springframework.amqp.core.ExchangeBuilder;
import org.springframework.amqp.core.Queue;

/**
 * 作者：**
 * 日期：2019/12/23 16:56
 */
@Configuration
public class RabbitMQ {

    //库存交换机
    public static final String STORY_EXCHANGE = "STORY_EXCHANGE";

    //订单交换机
    public static final String ORDER_EXCHANGE = "ORDER_EXCHANGE";

    //库存队列
    public static final String STORY_QUEUE = "STORY_QUEUE";

    //订单队列
    public static final String ORDER_QUEUE = "ORDER_QUEUE";

    //库存路由键
    public static final String STORY_ROUTING_KEY = "STORY_ROUTING_KEY";

    //订单路由键
    public static final String ORDER_ROUTING_KEY = "ORDER_ROUTING_KEY";
    @Bean
    public MessageConverter messageConverter() {
        return new Jackson2JsonMessageConverter();
    }
    //创建库存交换机
    @Bean
    public Exchange getStoryExchange() {
        return ExchangeBuilder.directExchange(STORY_EXCHANGE).durable(true).build();
    }
    //创建库存队列
    @Bean
    public Queue getStoryQueue() {
        return new Queue(STORY_QUEUE);
    }
    //库存交换机和库存队列绑定
    @Bean
    public Binding bindStory() {
        return BindingBuilder.bind(getStoryQueue()).to(getStoryExchange()).with(STORY_ROUTING_KEY).noargs();
    }
    //创建订单队列
    @Bean
    public Queue getOrderQueue() {
        return new Queue(ORDER_QUEUE);
    }
    //创建订单交换机
    @Bean
    public Exchange getOrderExchange() {
        return ExchangeBuilder.directExchange(ORDER_EXCHANGE).durable(true).build();
    }
    //订单队列与订单交换机进行绑定
    @Bean
    public Binding bindOrder() {
        return BindingBuilder.bind(getOrderQueue()).to(getOrderExchange()).with(ORDER_ROUTING_KEY).noargs();
    }
}

配置rabbitmq得实现方式以及redis得实现方式
在 service包下面新建 MQOrderService.java
这个类属于订单得消费队列

package com.example.myredis.service;

import com.example.myredis.config.RabbitMQ;
import com.example.myredis.pojo.Order;
import com.example.myredis.service.OrderService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
 * 作者：刘怡
 * 日期：2019/12/24 9:17
 */
@Service
@Slf4j
public class MQOrderService {
    @Autowired
    private OrderService orderService;
    /**
     * 监听订单消息队列，并消费
     *
     * @param order
     */
    @RabbitListener(queues = RabbitMQ.ORDER_QUEUE)
    public void createOrder(Order order) {
        log.info("收到订单消息，订单用户为：{}，商品名称为：{}", order.getOrder_user(), order.getOrder_name());
        /**
         * 调用数据库orderService创建订单信息
         */
        orderService.createOrder(order);
    }
}

MQStockService

这个属于库存得消费队列

package com.example.myredis.service;
import com.example.myredis.config.RabbitMQ;
import com.example.myredis.service.StockSerivce;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
 * 作者：**
 * 日期：2019/12/24 9:18
 */
@Service
@Slf4j
public class MQStockService {
    @Autowired
    private StockSerivce stockService;
    /**
     * 监听库存消息队列，并消费
     * @param stockName
     */
    @RabbitListener(queues = RabbitMQ.STORY_QUEUE)
    public void decrByStock(String stockName) {
        log.info("库存消息队列收到的消息商品信息是：{}", stockName);
        /**
         * 调用数据库service给数据库对应商品库存减一
         */
        stockService.decrByStock(stockName);
    }
}

RedisService.java
这个配置类，主要用来实现对redis得key和value初始化以及对value得操作

package com.example.myredis.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import java.util.Date;
import java.util.concurrent.TimeUnit;

/**
 * 作者：**
 * 日期：2019/12/24 9:21
 */
@Service
public class RedisService {
    @Autowired
    private RedisTemplate<String, Object> redisTemplate;
    /**
     * 设置String键值对
     * @param key
     * @param value
     * @param millis
     */
    public void put(String key, Object value, long millis) {
        redisTemplate.opsForValue().set(key, value, millis, TimeUnit.MINUTES);
    }
    public void putForHash(String objectKey, String hkey, String value) {
        redisTemplate.opsForHash().put(objectKey, hkey, value);
    }
    public <T> T get(String key, Class<T> type) {
        return (T) redisTemplate.boundValueOps(key).get();
    }
    public void remove(String key) {
        redisTemplate.delete(key);
    }
    public boolean expire(String key, long millis) {
        return redisTemplate.expire(key, millis, TimeUnit.MILLISECONDS);
    }
    public boolean persist(String key) {
        return redisTemplate.hasKey(key);
    }
    public String getString(String key) {
        return (String) redisTemplate.opsForValue().get(key);
    }
    public Integer getInteger(String key) {
        return (Integer) redisTemplate.opsForValue().get(key);
    }
    public Long getLong(String key) {
        return (Long) redisTemplate.opsForValue().get(key);
    }
    public Date getDate(String key) {
        return (Date) redisTemplate.opsForValue().get(key);
    }

    /**
     * 对指定key的键值减一
     * @param key
     * @return
     */
    public Long decrBy(String key) {
        return redisTemplate.opsForValue().decrement(key);
    }
}

编写springboot启动类

package com.example.myredis;

import com.example.myredis.service.RedisService;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.example.myredis.mapper")
public class MyredisApplication implements ApplicationRunner {

    public static void main(String[] args) {
        SpringApplication.run(MyredisApplication.class, args);
    }

    @Autowired
    private RedisService redisService;

    /**
     * redis初始化各商品的库存量
     *
     * @param args
     * @throws Exception
     */
    @Override
    public void run(ApplicationArguments args) throws Exception {
        redisService.put("watch", 10, 20);
    }

}

最后的项目所有目录

测试之前

运行springboot项目，不能报错，打开redis服务和rabbitmq服务

redis

启动成功之后打开Redis Desktop Manager工具，查看是否新建了一个redis ：watch

JMeter

然后打开JMeter工具

选择中文。。。

新建一个测试计划

然后添加一个线程组

给这个线程组得数量为40，这个线程组得作用就是模拟40个用户发送请求，去秒杀

然后再在线程组右键，添加一个Http请求，这个就是我们用来发送请求的组件了

配置

这个请求唯一要说得就是，随机参数了，因为用户名肯定不可能给40个相同得名字，这边我们利用JMeter给用户名得值为随机数

点击上方的白色小书本，选择random，1-99得随机数

输入最大值和最小值，点击生成，函数粘贴复制出去就ok了最后我们在测试计划建一个结果树，查看我们发送请求返回得消息数据

成功

现在我们再打开redismanager，其中我们初始化为10，现在是-30，可以知道有40个线程去获取了它，现在为-30，每次前测试记得，手动清空缓存！！一定要记得

纯数据库方式秒杀结果

上面我们实现了redis+rabbitmq得秒杀，现在我们看看纯数据库方式得秒杀，看看有什么区别：

首先网stock库存表新增一条数据，类似于redis得初始化

在jmeter中修改原来得http请求信息，其中小米对应数据库得商品名

清空一下结果树，我们开始运行

run

控制台：

重要得是查看数据库得信息：

库存已经清空，再看order表

这样我们可以看到，明明只有10个库存得商品，抢到得人却不止10个，这样明细超卖了，请求树也可以看的超卖信息