学习目标:
所谓“秒杀”,就是网络卖家发布一些超低价格的商品,所有买家在同一时间网上抢购的一种销售方式。通俗一点讲就是网络商家为促销等目的组织的网上限时抢购活动。由于商品价格低廉,往往一上架就被抢购一空,有时只用一秒钟。
秒杀商品通常有三种限制:库存限制、时间限制、购买量限制。
(1)库存限制:商家只拿出限量的商品来秒杀。比如某商品实际库存是200件,但只拿出50件来参与秒杀。我们可以将其称为“秒杀库存”。商家赔本赚吆喝,图啥?人气!
(2)时间限制:通常秒杀都是有特定的时间段,只能在设定时间段进行秒杀活动;
(3)购买量限制:同一个商品只允许用户最多购买几件。比如某手机限购1件。张某第一次买个1件,那么在该次秒杀活动中就不能再次抢购
列表页
详情页
排队页
下单页
支付页
秒杀商品表seckill_goods
我们先把秒杀模块搭建好,秒杀一共有三个模块,秒杀微服务模块service-activity,负责封装秒杀全部服务端业务;秒杀前端模块web-all,负责前端显示业务;service-activity-client api接口模块
提供秒杀商品基础代码
搭建方式如service-order
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>gmall-service</artifactId>
<groupId>com.atguigu.gmall</groupId>
<version>1.0</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>service-activity</artifactId>
<dependencies>
<dependency>
<groupId>com.atguigu.gmall</groupId>
<artifactId>service-user-client</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>com.atguigu.gmall</groupId>
<artifactId>service-order-client</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>com.atguigu.gmall</groupId>
<artifactId>rabbit-util</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
<build>
<finalName>service-activity</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
package com.atguigu.gmall;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class ActivityApp {
public static void main(String[] args) {
SpringApplication.run(ActivityApp.class, args);
}
}
在resources目录下新建:bootstrap.properties
spring.application.name=service-activity
spring.profiles.active=dev
spring.cloud.nacos.discovery.server-addr=192.168.200.128:8848
spring.cloud.nacos.config.server-addr=192.168.200.128:8848
spring.cloud.nacos.config.prefix=${spring.application.name}
spring.cloud.nacos.config.file-extension=yaml
spring.cloud.nacos.config.shared-configs[0].data-id=common.yaml
搭建service-activity-client,搭建方式如service-order-client
<dependency>
<groupId>com.atguigu.gmall</groupId>
<artifactId>service-activity-client</artifactId>
<version>1.0</version>
</dependency>
缓存数据实现思路:service-task模块统一管理我们的定时任务,为了减少service-task模块的耦合度,我们可以在定时任务模块只发送mq消息,需要执行定时任务的模块监听该消息即可,这样有利于我们后期动态控制,例如:每天凌晨一点我们发送定时任务信息到mq交换机,如果秒杀业务凌晨一点需要导入数据到缓存,那么秒杀业务绑定队列到交换机就可以了,其他业务也是一样,这样就做到了很好的扩展。
上面提到我们要控制库存数量,不能超卖,那么如何控制呢?在这里我们提供一种解决方案,那就我们在导入商品缓存数据时,同时将商品库存信息导入队列{list},利用redis队列的原子性,保证库存不超卖
库存加入队列实施方案
1,如果秒杀商品有N个库存,那么我就循环往队列放入N个队列数据
2,秒杀开始时,用户进入,然后就从队列里面出队,只有队列里面有数据,说明就一点有库存(redis队列保证了原子性),队列为空了说明商品售罄
在service-task模块发送消息
搭建方式如service-mq
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>gmall-service</artifactId>
<groupId>com.atguigu.gmall</groupId>
<version>1.0</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>service-task</artifactId>
<dependencies>
<!--rabbitmq消息队列-->
<dependency>
<groupId>com.atguigu.gmall</groupId>
<artifactId>rabbit-util</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
<build>
<finalName>service-task</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
说明:引入rabbit-util依赖定时发送消息
package com.atguigu.gmall;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)//取消数据源自动配置
@EnableDiscoveryClient
public class TaskApp {
public static void main(String[] args) {
SpringApplication.run(TaskApp.class, args);
}
}
bootstrap.properties
spring.application.name=service-task
spring.profiles.active=dev
spring.cloud.nacos.discovery.server-addr=192.168.200.128:8848
spring.cloud.nacos.config.server-addr=192.168.200.128:8848
spring.cloud.nacos.config.prefix=${spring.application.name}
spring.cloud.nacos.config.file-extension=yaml
spring.cloud.nacos.config.shared-configs[0].data-id=common.yaml
定义凌晨一点mq相关常量
/**
* 定时任务
*/
public static final String EXCHANGE_DIRECT_TASK = "exchange.direct.task";
public static final String ROUTING_TASK_1 = "seckill.task.1";
//队列
public static final String QUEUE_TASK_1 = "queue.task.1";
package com.atguigu.gmall.task.scheduled;
import com.atguigu.gmall.common.constant.MqConst;
import com.atguigu.gmall.common.service.RabbitService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
@Slf4j
@Component
@EnableScheduling
public class ScheduledTask {
@Autowired
private RabbitService rabbitService;
/**
* 正式每天凌晨1点执行
* 测试每隔30s执行
*/
//@Scheduled(cron = "0/30 * * * * ?")
@Scheduled(cron = "0 0 1 * * ?")
public void task1() {
rabbitService.sendMessage(MqConst.EXCHANGE_DIRECT_TASK, MqConst.ROUTING_TASK_1, "");
}
}
在service-activity模块绑定与监听消息,处理缓存逻辑,更新状态位
//秒杀商品前缀
public static final String SECKILL_GOODS = "seckill:goods";
public static final String SECKILL_ORDERS = "seckill:orders";
public static final String SECKILL_ORDERS_USERS = "seckill:orders:users";
public static final String SECKILL_STOCK_PREFIX = "seckill:stock:";
public static final String SECKILL_USER = "seckill:user:";
//用户锁定时间 单位:秒
public static final int SECKILL__TIMEOUT = 60 * 60;
在service-activity
秒杀微服务中监听消息,批量导入秒杀商品到Redis完成缓存预热
package com.atguigu.gmall.activity.receiver;
import com.atguigu.gmall.activity.model.SeckillGoods;
import com.atguigu.gmall.activity.service.SeckillGoodsService;
import com.atguigu.gmall.common.constant.MqConst;
import com.atguigu.gmall.common.constant.RedisConst;
import com.atguigu.gmall.common.util.DateUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.rabbitmq.client.Channel;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.Exchange;
import org.springframework.amqp.rabbit.annotation.Queue;
import org.springframework.amqp.rabbit.annotation.QueueBinding;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import java.util.Date;
import java.util.List;
/**
* @author: atguigu
* @create: 2023-01-27 21:38
*/
@Slf4j
@Component
public class SeckillReceiver {
@Autowired
private SeckillGoodsService seckillGoodsService;
@Autowired
private RedisTemplate redisTemplate;
/**
* 将秒杀商品进行预热
*
* @param message
* @param channel
*/
@RabbitListener(bindings = @QueueBinding(
exchange = @Exchange(MqConst.EXCHANGE_DIRECT_TASK),
value = @Queue(MqConst.QUEUE_TASK_1),
key = {MqConst.ROUTING_TASK_1}
))
public void importSeckillGoodsToRedis(Message message, Channel channel) {
try {
// 将当天的秒杀商品放入缓存!通过mapper 执行sql 语句!
// 条件当天 ,剩余库存>0 , 审核状态 = 1
LambdaQueryWrapper<SeckillGoods> queryWrapper = new LambdaQueryWrapper<>();
queryWrapper.eq(SeckillGoods::getStatus, "1").gt(SeckillGoods::getStockCount, 0);
// select DATE_FORMAT(start_time,'%Y-%m-%d') from seckill_goods; yyyy-mm-dd
queryWrapper.apply("DATE_FORMAT(start_time,'%Y-%m-%d') = " + "'" + DateUtil.formatDate(new Date()) + "'");
// 获取到当天秒杀的商品列表!
List<SeckillGoods> seckillGoodsList = seckillGoodsService.list(queryWrapper);
// 将seckillGoodsList 这个集合数据放入缓存!
for (SeckillGoods seckillGoods : seckillGoodsList) {
// 考虑使用哪种数据类型,以及缓存的key!使用hash! hset key field value hget key field
// 定义key = SECKILL_GOODS field = skuId value = seckillGoods
// 判断当前缓存key 中是否有 秒杀商品的skuId
Boolean flag = redisTemplate.boundHashOps(RedisConst.SECKILL_GOODS).hasKey(seckillGoods.getSkuId().toString());
// 判断
if (flag) {
// 表示缓存中已经当前的商品了。
continue;
}
// 没有就放入缓存!
redisTemplate.boundHashOps(RedisConst.SECKILL_GOODS).put(seckillGoods.getSkuId().toString(), seckillGoods);
// 将每个商品对应的库存剩余数,放入redis-list 集合中!
for (Integer i = 0; i < seckillGoods.getStockCount(); i++) {
// 放入list key = seckill:stock:skuId;
String key = RedisConst.SECKILL_STOCK_PREFIX + seckillGoods.getSkuId();
redisTemplate.opsForList().leftPush(key, seckillGoods.getSkuId().toString());
}
// 秒杀商品在初始化的时候:状态位初始化 1
// publish seckillpush 46:1 | 后续业务如果说商品被秒杀完了! publish seckillpush 46:0
redisTemplate.convertAndSend("seckillpush", seckillGoods.getSkuId() + ":1");
}
// 手动确认消息
channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
} catch (Exception e) {
e.printStackTrace();
log.error("【秒杀服务】秒杀商品预热异常:{}", e);
}
}
}
package com.atguigu.gmall.activity.mapper;
import com.atguigu.gmall.model.activity.SeckillGoods;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
public interface SeckillGoodsMapper extends BaseMapper<SeckillGoods> {
}
由于我们的秒杀服务时集群部署service-activity的,我们面临一个问题?RabbitMQ 如何实现对同一个应用的多个节点进行广播呢?
RabbitMQ 只能对绑定到交换机上面的不同队列实现广播,对于同一队列的消费者他们存在竞争关系,同一个消息只会被同一个队列下其中一个消费者接收,达不到广播效果;
我们目前的需求是定时任务发送消息,我们将秒杀商品导入缓存,同事更新集群的状态位,既然RabbitMQ 达不到广播的效果,我们就放弃吗?当然不是,我们很容易就想到一种解决方案,通过redis的发布订阅模式来通知其他兄弟节点,这不问题就解决了吗?
过程大致如下:
应用启动,多个节点监听同一个队列(此时多个节点是竞争关系,一条消息只会发到其中一个节点上)
消息生产者发送消息,同一条消息只被其中一个节点收到收到消息的节点通过redis的发布订阅模式来通知其他兄弟节点
接下来配置redis发布与订阅
参考资料:
https://www.runoob.com/redis/redis-pub-sub.html
package com.atguigu.gmall.activity.redis;
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.StringRedisTemplate;
import org.springframework.data.redis.listener.PatternTopic;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;
@Configuration
public class RedisChannelConfig {
/*
docker exec -it bc92 redis-cli
subscribe seckillpush // 订阅 接收消息
publish seckillpush admin // 发布消息
*/
/**
* 注入订阅主题
* @param connectionFactory redis 链接工厂
* @param listenerAdapter 消息监听适配器
* @return 订阅主题对象
*/
@Bean
RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory,
MessageListenerAdapter listenerAdapter) {
RedisMessageListenerContainer container = new RedisMessageListenerContainer();
container.setConnectionFactory(connectionFactory);
//订阅主题
container.addMessageListener(listenerAdapter, new PatternTopic("seckillpush"));
//这个container 可以添加多个 messageListener
return container;
}
/**
* 返回消息监听器
* @param receiver 创建接收消息对象
* @return
*/
@Bean
MessageListenerAdapter listenerAdapter(MessageReceive receiver) {
//这个地方 是给 messageListenerAdapter 传入一个消息接受的处理器,利用反射的方法调用“receiveMessage”
//也有好几个重载方法,这边默认调用处理器的方法 叫handleMessage 可以自己到源码里面看
return new MessageListenerAdapter(receiver, "receiveMessage");
}
@Bean //注入操作数据的template
StringRedisTemplate template(RedisConnectionFactory connectionFactory) {
return new StringRedisTemplate(connectionFactory);
}
}
监听消息
package com.atguigu.gmall.activity.redis;
import com.atguigu.gmall.activity.util.CacheHelper;
import com.github.benmanes.caffeine.cache.Cache;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
/**
* @author: atguigu
* @create: 2023-01-30 15:19
*/
@Slf4j
@Component
public class MessageReceive {
@Autowired
private Cache<String, String> seckillCache;
/**
* 本地缓存重复服务后没了,需要清理分布式缓存,再重新加入缓存
* 订阅主题seckillpush中消息
*
*
* @param msg 形式 ""37:1""
* 消息格式
* skuId:0 表示没有商品
* skuId:1 表示有商品
*/
public void receiveMessage(String msg) {
log.info("监听到广播消息:" + msg);
if (StringUtils.isNotBlank(msg)) {
//去除多余引号
msg = msg.replaceAll("\"", "");
//将商品状态位 存入本地缓存 自定义或者Caffeine均可
String[] split = msg.split(":");
if (split != null && split.length == 2) {
CacheHelper.put(split[0], split[1]);
//seckillCache.put(split[0], split[1]);
}
}
}
}
CacheHelper类本地缓存类
package com.atguigu.gmall.activity.util;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* 系统缓存类
*/
public class CacheHelper {
/**
* 缓存容器
*/
private final static Map<String, Object> cacheMap = new ConcurrentHashMap<String, Object>();
/**
* 加入缓存
*
* @param key
* @param cacheObject
*/
public static void put(String key, Object cacheObject) {
cacheMap.put(key, cacheObject);
}
/**
* 获取缓存
* @param key
* @return
*/
public static Object get(String key) {
return cacheMap.get(key);
}
/**
* 清除缓存
*
* @param key
* @return
*/
public static void remove(String key) {
cacheMap.remove(key);
}
public static synchronized void removeAll() {
cacheMap.clear();
}
}
说明:
1,RedisChannelConfig 类配置redis监听的主题和消息处理器
2,MessageReceive 类为消息处理器,消息message为:商品id与状态位,如:1:1 表示商品id为1,状态位为1
或者采用Caffeine基于JDK8的高能效本地缓存
注册缓存对象
/**
* Caffine本地缓存应用
* @return
*/
@Bean
public Cache<String, String> cache(){
Cache<String, String> cache = Caffeine.newBuilder()
.initialCapacity(0) //初始化容量
.maximumSize(3) //缓存最大数量
//.expireAfterWrite(1, TimeUnit.DAYS) //设置有效期
.build();
return cache;
}
监听已经配置好,接下来我就发布消息,更改秒杀监听器{ SeckillReceiver },如下
完整代码如下
package com.atguigu.gmall.activity.recevier;
import com.atguigu.gmall.activity.model.SeckillGoods;
import com.atguigu.gmall.activity.service.SeckillGoodsService;
import com.atguigu.gmall.common.constant.MqConst;
import com.atguigu.gmall.common.constant.RedisConst;
import com.atguigu.gmall.common.util.DateUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.rabbitmq.client.Channel;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.Exchange;
import org.springframework.amqp.rabbit.annotation.Queue;
import org.springframework.amqp.rabbit.annotation.QueueBinding;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundHashOperations;
import org.springframework.data.redis.core.BoundListOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import java.util.Date;
import java.util.List;
/**
* @author: atguigu
* @create: 2023-01-30 14:10
*/
@Component
public class SeckillReceiver {
@Autowired
private SeckillGoodsService seckillGoodsService;
@Autowired
private RedisTemplate redisTemplate;
/**
* 缓存预热
* 监听定时服务消息,将秒杀库中商品加入到缓存
* 所有秒杀商品 hash 结构 redisKey seckill:goods hashKey:skuId hashVal:秒杀商品表中商品信息
* 某个秒杀商品库存 List结构 Key seckill:stock:+skuId vals skuId
*
* @param message
* @param channel
*/
@RabbitListener(bindings = @QueueBinding(
exchange = @Exchange(MqConst.EXCHANGE_DIRECT_TASK),
value = @Queue(MqConst.QUEUE_TASK_1),
key = MqConst.ROUTING_TASK_1
))
public void importSeckillGoodsToRedis(Message message, Channel channel) {
//1.查询秒杀表中商品 条件:审核状态必须为“1” 秒杀商品库存大于0 秒杀开始时间是当日
LambdaQueryWrapper<SeckillGoods> queryWrapper = new LambdaQueryWrapper<>();
queryWrapper.eq(SeckillGoods::getStatus, "1");
queryWrapper.gt(SeckillGoods::getStockCount, 0);
queryWrapper.apply("DATE_FORMAT(start_time,'%Y-%m-%d') = '" + DateUtil.formatDate(new Date()) + "'");
List<SeckillGoods> seckillGoodsList = seckillGoodsService.list(queryWrapper);
//2.将秒杀商品遍历存入缓存
if (!CollectionUtils.isEmpty(seckillGoodsList)) {
String redisKey = RedisConst.SECKILL_GOODS;
BoundHashOperations<String, String, SeckillGoods> hashOps = redisTemplate.boundHashOps(redisKey);
for (SeckillGoods seckillGoods : seckillGoodsList) {
//2.1 判断缓存中已有秒杀商品
Boolean flag = hashOps.hasKey(seckillGoods.getSkuId().toString());
if (flag) {
continue;
}
//2.2 将秒杀商品存入Redis Hash结构存储所有秒杀商品
hashOps.put(seckillGoods.getSkuId().toString(), seckillGoods);
//2.3 为每个秒杀商品设置库存避免超卖 List结构
String stockKey = RedisConst.SECKILL_STOCK_PREFIX + seckillGoods.getSkuId();
BoundListOperations listOps = redisTemplate.boundListOps(stockKey);
for (Integer i = 0; i < seckillGoods.getStockCount(); i++) {
listOps.leftPush(seckillGoods.getSkuId().toString());
}
//2.4 TODO 商品被加入到分布式缓存后,需要通知每个秒杀服务更新本地缓存中 商品状态
redisTemplate.convertAndSend("seckillpush", seckillGoods.getSkuId()+":1");
}
}
}
}
说明:到目前我们就实现了商品信息导入缓存,同时更新状态位的工作
YAPI接口地址:
package com.atguigu.gmall.activity.controller;
import com.atguigu.gmall.activity.service.SeckillGoodsService;
import com.atguigu.gmall.common.result.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/api/activity/seckill")
public class SeckillGoodsApiController {
@Autowired
private SeckillGoodsService seckillGoodsService;
/**
* 返回全部列表
*
* @return
*/
@GetMapping("/findAll")
public Result findAll() {
return Result.ok(seckillGoodsService.findAll());
}
/**
* 获取实体
*
* @param skuId
* @return
*/
@GetMapping("/getSeckillGoods/{skuId}")
public Result getSeckillGoods(@PathVariable("skuId") Long skuId) {
return Result.ok(seckillGoodsService.getSeckillGoods(skuId));
}
}
package com.atguigu.gmall.activity.service;
import com.atguigu.gmall.activity.model.SeckillGoods;
import com.baomidou.mybatisplus.extension.service.IService;
import java.util.List;
public interface SeckillGoodsService extends IService<SeckillGoods> {
/**
* 查询当日参与秒杀商品列表
* @return
*/
List<SeckillGoods> findAll();
/**
* 查询指定秒杀商品信息
* @param skuId
* @return
*/
SeckillGoods getSeckillGoods(Long skuId);
}
package com.atguigu.gmall.activity.service.impl;
import com.atguigu.gmall.activity.mapper.SeckillGoodsMapper;
import com.atguigu.gmall.activity.model.SeckillGoods;
import com.atguigu.gmall.activity.service.SeckillGoodsService;
import com.atguigu.gmall.common.constant.RedisConst;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundHashOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* @author: atguigu
* @create: 2023-01-30 11:47
*/
@Slf4j
@Service
public class SeckillGoodsServiceImpl extends ServiceImpl<SeckillGoodsMapper, SeckillGoods> implements SeckillGoodsService {
@Autowired
private RedisTemplate redisTemplate;
/**
* 查询当日参与秒杀商品列表
*
* @return
*/
@Override
public List<SeckillGoods> findAll() {
String redisKey = RedisConst.SECKILL_GOODS;
BoundHashOperations<String, String, SeckillGoods> hashOps = redisTemplate.boundHashOps(redisKey);
return hashOps.values();
}
/**
* 查询指定秒杀商品信息
*
* @param skuId
* @return
*/
@Override
public SeckillGoods getSeckillGoods(Long skuId) {
String redisKey = RedisConst.SECKILL_GOODS;
BoundHashOperations<String, String, SeckillGoods> hashOps = redisTemplate.boundHashOps(redisKey);
return hashOps.get(skuId.toString());
}
}
远程调用Feign API接口
package com.atguigu.gmall.activity.client;
import com.atguigu.gmall.activity.client.impl.ActivityDegradeFeignClient;
import com.atguigu.gmall.activity.model.SeckillGoods;
import com.atguigu.gmall.common.result.Result;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import java.util.List;
@FeignClient(value = "service-activity", fallback = ActivityDegradeFeignClient.class)
public interface ActivityFeignClient {
/**
* 返回全部列表
*
* @return
*/
@GetMapping("/api/activity/seckill/findAll")
Result<List<SeckillGoods>> findAll();
/**
* 获取实体
*
* @param skuId
* @return
*/
@GetMapping("/api/activity/seckill/getSeckillGoods/{skuId}")
Result<SeckillGoods> getSeckillGoods(@PathVariable("skuId") Long skuId);
}
服务降级类
package com.atguigu.gmall.activity.client.impl;
import com.atguigu.gmall.activity.client.ActivityFeignClient;
import com.atguigu.gmall.common.result.Result;
import org.springframework.stereotype.Component;
@Component
public class ActivityDegradeFeignClient implements ActivityFeignClient {
@Override
public Result findAll() {
return Result.fail();
}
@Override
public Result getSeckillGoods(Long skuId) {
return Result.fail();
}
}
在 web-all 项目中添加控制器
package com.atguigu.gmall.all.controller;
import com.atguigu.gmall.activity.client.ActivityFeignClient;
import com.atguigu.gmall.common.result.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
@Controller
public class SeckillController {
@Autowired
private ActivityFeignClient activityFeignClient;
/**
* 秒杀列表
* @param model
* @return
*/
@GetMapping("seckill.html")
public String index(Model model) {
Result result = activityFeignClient.findAll();
model.addAttribute("list", result.getData());
return "seckill/index";
}
}
列表
页面资源: \templates\seckill\index.html
<div class="goods-list" id="item">
<ul class="seckill" id="seckill">
<li class="seckill-item" th:each="item: ${list}">
<div class="pic" th:@click="|detail(${item.skuId})|">
<img th:src="${item.skuDefaultImg}" alt=''>
</div>
<div class="intro">
<span th:text="${item.skuName}">手机</span>
</div>
<div class='price'>
<b class='sec-price' th:text="'¥'+${item.costPrice}">¥0</b>
<b class='ever-price' th:text="'¥'+${item.price}">¥0</b>
</div>
<div class='num'>
<div th:text="'已售'+${item.num}">已售1</div>
<div class='progress'>
<div class='sui-progress progress-danger'>
<span style='width: 70%;' class='bar'></span>
</div>
</div>
<div>剩余
<b class='owned' th:text="${item.stockCount}">0</b>件</div>
</div>
<a class='sui-btn btn-block btn-buy' th:href="'/seckill/'+${item.skuId}+'.html'" target='_blank'>立即抢购</a>
</li>
</ul>
</div>
说明:
1,立即购买,该按钮我们要加以控制,该按钮就是一个链接,页面只是控制能不能点击,一般用户可以绕过去,直接点击秒杀下单,所以我们要加以控制,在秒杀没有开始前,不能进入秒杀页面
SeckillController
@GetMapping("seckill/{skuId}.html")
public String getItem(@PathVariable Long skuId, Model model){
// 通过skuId 查询skuInfo
Result result = activityFeignClient.getSeckillGoods(skuId);
model.addAttribute("item", result.getData());
return "seckill/item";
}
<div class="product-info">
<div class="fl preview-wrap">
<!--放大镜效果-->
<div class="zoom">
<!--默认第一个预览-->
<div id="preview" class="spec-preview">
<span class="jqzoom"><img th:jqimg="${item.skuDefaultImg}" th:src="${item.skuDefaultImg}" width="400" height="400"/></span>
</div>
</div>
</div>
<div class="fr itemInfo-wrap">
<div class="sku-name">
<h4 th:text="${item.skuName}">三星</h4>
</div>
<div class="news">
<span><img src="/img/_/clock.png"/>品优秒杀</span>
<span class="overtime">{{timeTitle}}:{{timeString}}</span>
</div>
<div class="summary">
<div class="summary-wrap">
<div class="fl title">
<i>秒杀价</i>
</div>
<div class="fl price">
<i>¥</i>
<em th:text="${item.costPrice}">0</em>
<span th:text="'原价:'+${item.price}">原价:0</span>
</div>
<div class="fr remark">
剩余库存:<span th:text="${item.stockCount}">0</span>
</div>
</div>
<div class="summary-wrap">
<div class="fl title">
<i>促 销</i>
</div>
<div class="fl fix-width">
<i class="red-bg">加价购</i>
<em class="t-gray">满999.00另加20.00元,或满1999.00另加30.00元,或满2999.00另加40.00元,即可在购物车换购热销商品</em>
</div>
</div>
</div>
<div class="support">
<div class="summary-wrap">
<div class="fl title">
<i>支 持</i>
</div>
<div class="fl fix-width">
<em class="t-gray">以旧换新,闲置手机回收 4G套餐超值抢 礼品购</em>
</div>
</div>
<div class="summary-wrap">
<div class="fl title">
<i>配 送 至</i>
</div>
<div class="fl fix-width">
<em class="t-gray">满999.00另加20.00元,或满1999.00另加30.00元,或满2999.00另加40.00元,即可在购物车换购热销商品</em>
</div>
</div>
</div>
<div class="clearfix choose">
<div class="summary-wrap">
<div class="fl title">
</div>
<div class="fl">
<ul class="btn-choose unstyled">
<li>
<a href="javascript:" v-if="isBuy" @click="queue()" class="sui-btn btn-danger addshopcar">立即抢购</a>
<a href="javascript:" v-if="!isBuy" class="sui-btn btn-danger addshopcar" disabled="disabled">立即抢购</a>
</li>
</ul>
</div>
</div>
</div>
</div>
</div>
思路:页面初始化时,拿到商品秒杀开始时间和结束时间等信息,实现距离开始时间和活动倒计时。
活动未开始时,显示距离开始时间倒计时;
活动开始后,显示活动结束时间倒计时。
倒计时代码片段
init() {
// debugger
// 计算出剩余时间
var startTime = new Date(this.data.startTime).getTime();
var endTime = new Date(this.data.endTime).getTime();
var nowTime = new Date().getTime(); //存在问题的 实际当前系统时间,从时间服务器获取统一时间标准
var secondes = 0;
// 还未开始抢购
if(startTime > nowTime) {
this.timeTitle = '距离开始'
secondes = Math.floor((startTime - nowTime) / 1000);
}
if(nowTime > startTime && nowTime < endTime) {
this.isBuy = true
this.timeTitle = '距离结束'
secondes = Math.floor((endTime - nowTime) / 1000);
}
if(nowTime > endTime) {
this.timeTitle = '抢购结束'
secondes = 0;
}
const timer = setInterval(() => {
secondes = secondes - 1
this.timeString = this.convertTimeString(secondes)
}, 1000);
// 通过$once来监听定时器,在beforeDestroy钩子可以被清除。
this.$once('hook:beforeDestroy', () => {
clearInterval(timer);
})
},
时间转换方法
convertTimeString(allseconds) {
if(allseconds <= 0) return '00:00:00'
// 计算天数
var days = Math.floor(allseconds / (60 * 60 * 24));
// 小时
var hours = Math.floor((allseconds - (days * 60 * 60 * 24)) / (60 * 60));
// 分钟
var minutes = Math.floor((allseconds - (days * 60 * 60 * 24) - (hours * 60 * 60)) / 60);
// 秒
var seconds = allseconds - (days * 60 * 60 * 24) - (hours * 60 * 60) - (minutes * 60);
//拼接时间
var timString = "";
if (days > 0) {
timString = days + "天:";
}
return timString += hours + ":" + minutes + ":" + seconds;
}
在进入秒杀功能前,我们加一个下单码,只有你获取到该下单码,才能够进入秒杀方法进行秒杀
避免:用户提前知悉秒杀地址,通过恶意刷单软件进行非法下单。下单码生成条件:本地缓存中商品状态必须“1”;当前用户购买商品在销售时间内。
YAPI接口地址:http://192.168.200.128:3000/project/11/interface/api/531
SeckillGoodsApiController
/**
* 为当前用户购买意向生成抢购码
*
* @param skuId 商品ID
* @return
*/
@GetMapping("/auth/getSeckillSkuIdStr/{skuId}")
public Result getSeckillSkuStr(HttpServletRequest request, @PathVariable("skuId") Long skuId) {
//1.验证本地缓存中商品状态 必须是 “1”
String state = (String) CacheHelper.get(skuId.toString());
if (StringUtils.isBlank(state)) {
return Result.build(null, ResultCodeEnum.ILLEGAL_REQUEST);
}
if ("0".equals(state)) {
return Result.build(null, ResultCodeEnum.SECKILL_FINISH);
}
if ("1".equals(state)) {
//2.根据SKUID 查询分布式缓存中秒杀商品 获取开始时间,结束时间
SeckillGoods seckillGoods = seckillGoodsService.getSeckillGoods(skuId);
if (seckillGoods != null) {
Date startTime = seckillGoods.getStartTime();
Date endTime = seckillGoods.getEndTime();
Date now = new Date();
if (DateUtil.dateCompare(seckillGoods.getStartTime(), now) && DateUtil.dateCompare(now, seckillGoods.getEndTime())) {
//3.获取登录用户ID,按照规则生成 或者 将生成的强购码加入缓存Redis
String userId = AuthContextHolder.getUserId(request);
String encrypt = MD5.encrypt(userId + skuId);
//4.返回商品抢购码
return Result.ok(encrypt);
}
}
}
return Result.build(null, ResultCodeEnum.ILLEGAL_REQUEST);
}
说明:只有在商品秒杀时间范围内,才能获取下单码,这样我们就有效控制了用户非法秒杀,下单码我们可以根据业务自定义规则,目前我们定义为当前用户id MD5加密。
页面获取下单码,进入秒杀场景
queue() {
seckill.getSeckillSkuIdStr(this.skuId).then(response => {
var skuIdStr = response.data.data
window.location.href = '/seckill/queue.html?skuId='+this.skuId+'&skuIdStr='+skuIdStr
})
},
前端js完整代码如下
<script src="/js/api/seckill.js"></script>
<script th:inline="javascript">
var item = new Vue({
el: '#item',
data: {
skuId: [[${item.skuId}]],
data: [[${item}]],
timeTitle: '距离开始',
timeString: '00:00:00',
isBuy: false
},
created() {
this.init()
},
methods: {
init() {
// debugger
// 计算出剩余时间
var startTime = new Date(this.data.startTime).getTime();
var endTime = new Date(this.data.endTime).getTime();
var nowTime = new Date().getTime();
var secondes = 0;
// 还未开始抢购
if(startTime > nowTime) {
this.timeTitle = '距离开始'
secondes = Math.floor((startTime - nowTime) / 1000);
}
if(nowTime > startTime && nowTime < endTime) {
this.isBuy = true
this.timeTitle = '距离结束'
secondes = Math.floor((endTime - nowTime) / 1000);
}
if(nowTime > endTime) {
this.timeTitle = '抢购结束'
secondes = 0;
}
const timer = setInterval(() => {
secondes = secondes - 1
this.timeString = this.convertTimeString(secondes)
}, 1000);
// 通过$once来监听定时器,在beforeDestroy钩子可以被清除。
this.$once('hook:beforeDestroy', () => {
clearInterval(timer);
})
},
queue() {
seckill.getSeckillSkuIdStr(this.skuId).then(response => {
var skuIdStr = response.data.data
window.location.href = '/seckill/queue.html?skuId='+this.skuId+'&skuIdStr='+skuIdStr
})
},
convertTimeString(allseconds) {
if(allseconds <= 0) return '00:00:00'
// 计算天数
var days = Math.floor(allseconds / (60 * 60 * 24));
// 小时
var hours = Math.floor((allseconds - (days * 60 * 60 * 24)) / (60 * 60));
// 分钟
var minutes = Math.floor((allseconds - (days * 60 * 60 * 24) - (hours * 60 * 60)) / 60);
// 秒
var seconds = allseconds - (days * 60 * 60 * 24) - (hours * 60 * 60) - (minutes * 60);
//拼接时间
var timString = "";
if (days > 0) {
timString = days + "天:";
}
return timString += hours + ":" + minutes + ":" + seconds;
}
}
})
</script>
web-all
模块中SeckillController
/**
* 渲染排队页面
* @param skuId
* @param skuIdStr
* @param model
* @return
*/
@GetMapping("seckill/queue.html")
public String queue(@RequestParam(name = "skuId") Long skuId,
@RequestParam(name = "skuIdStr") String skuIdStr,
Model model) {
model.addAttribute("skuId", skuId);
model.addAttribute("skuIdStr", skuIdStr);
return "seckill/queue";
}
页面
页面资源: \templates\seckill\queue.html
<div class="cart py-container" id="item">
<div class="seckill_dev" v-if="show == 1">
排队中...
</div>
<div class="seckill_dev" v-if="show == 2">
{{message}}
</div>
<div class="seckill_dev" v-if="show == 3">
抢购成功
<a href="/seckill/trade.html" target="_blank">去下单</a>
</div>
<div class="seckill_dev" v-if="show == 4">
抢购成功
<a href="/myOrder.html" target="_blank">我的订单</a>
</div>
</div>
Js部分
<script src="/js/api/seckill.js"></script>
<script th:inline="javascript">
var item = new Vue({
el: '#item',
data: {
skuId: [[${skuId}]],
skuIdStr: [[${skuIdStr}]],
data: {},
show: 1,
code: 211,
message: '',
isCheckOrder: false
},
mounted() {
const timer = setInterval(() => {
if(this.code != 211) {
clearInterval(timer);
}
this.checkOrder()
}, 3000);
// 通过$once来监听定时器,在beforeDestroy钩子可以被清除。
this.$once('hook:beforeDestroy', () => {
clearInterval(timer);
})
},
created() {
this.saveOrder();
},
methods: {
saveOrder() {
seckill.seckillOrder(this.skuId, this.skuIdStr).then(response => {
debugger
console.log(JSON.stringify(response))
if(response.data.code == 200) {
this.isCheckOrder = true
} else {
this.show = 2
this.message = response.data.message
}
})
},
checkOrder() {
if(!this.isCheckOrder) return
seckill.checkOrder(this.skuId).then(response => {
debugger
this.data = response.data.data
this.code = response.data.code
console.log(JSON.stringify(this.data))
//排队中
if(response.data.code == 211) {
this.show = 1
} else {
//秒杀成功
if(response.data.code == 215) {
this.show = 3
this.message = response.data.message
} else {
if(response.data.code == 218) {
this.show = 4
this.message = response.data.message
} else {
this.show = 2
this.message = response.data.message
}
}
}
})
}
}
})
</script>
说明:该页面直接通过controller返回页面,进入页面后显示排队中,然后通过异步执行秒杀下单,提交成功,页面通过轮询后台方法查询秒杀状态
秒杀的主要目的就是获取一个下单资格,拥有下单资格就可以去下单支付,获取下单资格后的流程就与正常下单流程一样,只是没有购物车这一步,总结起来就是,秒杀根据库存获取下单资格,拥有下单资格进入下单页面(选择地址,支付方式,提交订单,然后支付订单)
步骤:
1,校验抢购码,只有正确获得抢购码的请求才是合法请求
2,校验状态位state,
State为null,说明非法请求;
State为0说明已经售罄;
State为1,说明可以抢购
状态位是在内存中判断,效率极高,如果售罄,直接就返回了,不会给服务器造成太大压力
3,前面条件都成立,将秒杀用户加入队列,然后直接返回
4,前端轮询秒杀状态,查询秒杀结果
YAPI接口地址:http://192.168.200.128:3000/project/11/interface/api/515
/**
* 秒杀
*/
public static final String EXCHANGE_DIRECT_SECKILL_USER = "exchange.direct.seckill.user";
public static final String ROUTING_SECKILL_USER = "seckill.user";
//队列
public static final String QUEUE_SECKILL_USER = "queue.seckill.user";
记录哪个用户要购买哪个商品!
@Data
public class UserRecode implements Serializable {
private static final long serialVersionUID = 1L;
private Long skuId;
private String userId;
}
SeckillGoodsApiController
/**
* 秒杀请求入队
* @param request
* @param skuId 商品ID
* @param skuIdStr 用户抢购码
* @return
*/
@PostMapping("/auth/seckillOrder/{skuId}")
public Result seckillRequestToQueue(HttpServletRequest request, @PathVariable("skuId") Long skuId, String skuIdStr){
String userId = AuthContextHolder.getUserId(request);
return seckillGoodsService.seckillRequestToQueue(userId, skuId, skuIdStr);
}
SeckillGoodsService
/**
* 秒杀请求入队
* @param skuId 商品ID
* @param skuIdStr 用户抢购码
* @return
*/
Result seckillRequestToQueue(String userId, Long skuId, String skuIdStr);
SeckillGoodsServiceImpl
/**
* 秒杀请求入队 1.校验抢购码2.校验本地缓存中商品状态3.构建用户购买意向发送消息MQ
*
* @param skuId 商品ID
* @param skuIdStr 用户抢购码
* @return
*/
@Override
public Result seckillRequestToQueue(String userId, Long skuId, String skuIdStr) {
//1.校验抢购码
//1.1 按照以前生成规则
String encrypt = MD5.encrypt(userId + skuId);
//1.2 判断抢购码是否正确
if (StringUtils.isBlank(skuIdStr) || !encrypt.equals(skuIdStr)) {
return Result.build(null, ResultCodeEnum.ILLEGAL_REQUEST);
}
//2.校验本地缓存中商品状态
String state = (String) CacheHelper.get(skuId.toString());
if (StringUtils.isBlank(state)) {
return Result.build(null, ResultCodeEnum.ILLEGAL_REQUEST);
}
if ("0".equals(state)) {
return Result.build(null, ResultCodeEnum.SECKILL_FINISH);
}
if ("1".equals(state)) {
//3.构建用户购买意向发送消息MQ
UserRecode userRecode = new UserRecode();
userRecode.setUserId(userId);
userRecode.setSkuId(skuId);
rabbitService.sendMessage(MqConst.EXCHANGE_DIRECT_SECKILL_USER, MqConst.ROUTING_SECKILL_USER, userRecode);
return Result.build(null, ResultCodeEnum.SUCCESS);
}
return Result.build(null, ResultCodeEnum.SECKILL_RUN);
}
思路:
1,首先判断产品状态位,我们前面不是已经判断过了吗?因为产品可能随时售罄,mq队列里面可能堆积了十万数据,但是已经售罄了,那么后续流程就没有必要再走了;
2,判断用户是否已经下过订单,这个地方就是控制用户重复下单,同一个用户只能抢购一个下单资格,怎么控制呢?很简单,我们可以利用setnx控制用户,当用户第一次进来时,返回true,可以抢购,以后进入返回false,直接返回,过期时间可以根据业务自定义,这样用户这一段咋们就控制注了
3,获取队列中的商品,如果能够获取,则商品有库存,可以下单。如果获取的商品id为空,则商品售罄,商品售罄我们要第一时间通知兄弟节点,更新状态位,所以在这里发送redis广播
4,将订单记录放入redis缓存,说明用户已经获得下单资格,秒杀成功
5,秒杀成功要更新库存
/**
* 从秒杀队列中获取获取秒杀请求,进行秒杀订单预处理
* @param userRecode
* @param message
* @param channel
*/
@RabbitListener(bindings = @QueueBinding(
exchange = @Exchange(MqConst.EXCHANGE_DIRECT_SECKILL_USER),
value = @Queue(MqConst.QUEUE_SECKILL_USER),
key = MqConst.ROUTING_SECKILL_USER
))
public void processSeckillRequest(UserRecode userRecode, Message message, Channel channel) {
try {
if (userRecode != null) {
log.info("【秒杀服务】监听到秒杀请求:{}", userRecode);
seckillGoodsService.processPreSeckillOrder(userRecode);
}
channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
} catch (IOException e) {
e.printStackTrace();
log.error("【秒杀服务】监听到秒杀请求异常:", e);
}
}
/**
* 根据用户和商品ID实现秒杀下单
* @param skuId
* @param userId
*/
void seckillOrder(Long skuId, String userId);
秒杀订单实体类
package com.atguigu.gmall.model.activity;
@Data
public class OrderRecode implements Serializable {
private static final long serialVersionUID = 1L;
private String userId;
private SeckillGoods seckillGoods;
private Integer num;
private String orderStr;
}
SeckillGoodsServiceImpl
/**
* 处理队列中下单请求,进行秒杀订单预处理
*
* @param userRecode
*/
@Override
public void processPreSeckillOrder(UserRecode userRecode) {
//1.二次验证本地缓存中状态
String skuId = userRecode.getSkuId().toString();
String userId = userRecode.getUserId();
String state = (String) CacheHelper.get(skuId);
if ("0".equals(state)) {
//商品以及售罄
return;
}
//2.验证用户是否重复下单 setnx
//允许用户同一时间抢购多件商品
String key = RedisConst.SECKILL_USER + userId + ":" + skuId;
Boolean flag = redisTemplate.opsForValue().setIfAbsent(key, skuId);
if (!flag) {
//当前商品不允许重复下单
return;
}
//3.校验库存同时移除商品库存List中元素-同时缓存中扣减库存
String goodsId = (String) redisTemplate.boundListOps(RedisConst.SECKILL_STOCK_PREFIX + skuId).rightPop();
if (StringUtils.isBlank(goodsId)) {
//当前商品以及售罄 更新 所有的秒杀服务实例本地缓存中商品状态
redisTemplate.convertAndSend("seckillpush", skuId + ":0");
return;
}
//4.生成临时订单-抢购成功/抢购资格标记;将临时订单存入Redis缓存
OrderRecode orderRecode = new OrderRecode();
orderRecode.setUserId(userId);
orderRecode.setSeckillGoods(this.getSeckillGoods(Long.valueOf(skuId)));
orderRecode.setNum(1);
//临时订单订单码 采用MD5生成
orderRecode.setOrderStr(MD5.encrypt(userId + skuId));
redisTemplate.boundHashOps(RedisConst.SECKILL_ORDERS).put(userId, orderRecode);
//5.发送更新库存消息-异步更新分布式缓存Redis以及数据库Mysql中库存
rabbitService.sendMessage(MqConst.EXCHANGE_DIRECT_SECKILL_STOCK, MqConst.ROUTING_SECKILL_STOCK, skuId);
}
/**
* 秒杀减库存
*/
public static final String EXCHANGE_DIRECT_SECKILL_STOCK = "exchange.direct.seckill.stock";
public static final String ROUTING_SECKILL_STOCK = "seckill.stock";
//队列
public static final String QUEUE_SECKILL_STOCK = "queue.seckill.stock";
监听秒杀减库存:
/**
* 监听秒杀扣减库存
*
* @param skuId 商品ID
* @param message
* @param channel
*/
@RabbitListener(bindings = @QueueBinding(
exchange = @Exchange(MqConst.EXCHANGE_DIRECT_SECKILL_STOCK),
value = @Queue(MqConst.QUEUE_SECKILL_STOCK),
key = MqConst.ROUTING_SECKILL_STOCK
))
public void updateStock(Long skuId, Message message, Channel channel) {
try {
if (skuId != null) {
log.info("【秒杀服务】监听到秒杀扣减库存消息:{}", skuId);
seckillGoodsService.updateStock(skuId);
}
channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
} catch (IOException e) {
e.printStackTrace();
log.error("【秒杀服务】监听到秒杀扣减异常:{}", e);
}
}
SeckillGoodsService
/**
* 更新秒杀商品库存
* @param skuId
*/
void updateStock(Long skuId);
SeckillGoodsServiceImpl
/**
* 扣减秒杀库存 缓存Redis以及MySQL
*
* @param skuId
*/
@Override
@Transactional(rollbackFor = Exception.class)
public void updateStock(Long skuId) {
//1.根据SKUID查询剩余的库存数量
Long count = redisTemplate.boundListOps(RedisConst.SECKILL_STOCK_PREFIX + skuId).size();
//2.根据SKUID查询秒杀商品-等同于从数据库中查询
SeckillGoods seckillGoods = this.getSeckillGoods(skuId);
seckillGoods.setStockCount(count.intValue());
//3.更新缓存Redis中秒杀商品
redisTemplate.boundHashOps(RedisConst.SECKILL_GOODS).put(skuId.toString(), seckillGoods);
//4.更新数据库中秒杀商品数量
this.updateById(seckillGoods);
}
思路:
判断用户是否在缓存中存在
判断用户是否抢单成功
判断用户是否下过订单
判断状态位
YAPI接口地址:http://192.168.200.128:3000/project/11/interface/api/507
SeckillGoodsApiController
/**
* 检查用户秒杀商品结果
* @param skuId
* @param request
* @return
*/
@GetMapping(value = "auth/checkOrder/{skuId}")
public Result checkOrder(@PathVariable("skuId") Long skuId, HttpServletRequest request) {
//当前登录用户
String userId = AuthContextHolder.getUserId(request);
return seckillGoodsService.checkOrder(userId, skuId);
}
SeckillGoodsService接口
/**
* 检查用户秒杀商品结果
* @param userId
* @param skuId
* @return
*/
Result checkOrder(String userId, Long skuId);
SeckillGoodsServiceImpl
/**
* 检查秒杀结果
*
* @param userId 用户ID
* @param skuId 商品SKUID
* @return
*/
@Override
public Result checkOrder(String userId, Long skuId) {
//1.判断用户在缓存是否存在,有机会秒杀到商品
Boolean flag = redisTemplate.hasKey(RedisConst.SECKILL_USER + userId);
if (flag) {
//2.判断用户是否抢单成功 临时订单hash结构
flag = redisTemplate.boundHashOps(RedisConst.SECKILL_ORDERS).hasKey(userId);
if (flag) {
//抢购成功;响应临时订单数据
OrderRecode orderRecode = (OrderRecode) redisTemplate.boundHashOps(RedisConst.SECKILL_ORDERS).get(userId);
return Result.build(orderRecode, ResultCodeEnum.SECKILL_SUCCESS);
}
}
//3.判断用户是否提交秒杀订单
Boolean aBoolean = redisTemplate.boundHashOps(RedisConst.SECKILL_ORDERS_USERS).hasKey(userId);
if (aBoolean) {
//下单成功 响应提交的秒杀订单
Long orderId = (Long) redisTemplate.boundHashOps(RedisConst.SECKILL_ORDERS_USERS).get(userId);
return Result.build(orderId, ResultCodeEnum.SECKILL_ORDER_SUCCESS);
}
//4.判断本地缓存状态
String state = (String) CacheHelper.get(skuId.toString());
if ("0".equals(state)) {
return Result.build(null, ResultCodeEnum.SECKILL_FINISH);
}
return Result.build(null, ResultCodeEnum.SECKILL_RUN);
}
该页面有四种状态:
1,排队中
2,各种提示(非法、已售罄等)
3,抢购成功,去下单
4,抢购成功,已下单,显示我的订单
抢购成功,页面显示去下单,跳转下单确认页面
<div class="seckill_dev" v-if="show == 3">
抢购成功
<a href="/seckill/trade.html" target="_blank">去下单</a>
</div>
我们已经把下单信息记录到redis缓存中,所以接下来我们要组装下单页数据
YAPI接口地址:http://192.168.200.128:3000/project/11/interface/api/523
SeckillGoodsApiController
/**
* 秒杀订单确认页面渲染需要参数汇总接口
* @return
*/
@GetMapping("/auth/trade")
public Result seckillTradeData(HttpServletRequest request){
//1.获取当前登录用户ID
String userId = AuthContextHolder.getUserId(request);
//2.调用业务逻辑汇总数据
return seckillGoodsService.seckillTradeData(userId);
}
SeckillGoodsService
/**
* 秒杀订单确认页面渲染需要参数汇总接口
* @return
*/
Result seckillTradeData(String userId);
SeckillGoodsServiceImpl
/**
* 秒杀订单确认页面渲染需要参数汇总接口
*
* @return
*/
@Override
public Result seckillTradeData(String userId) {
//1.根据用户ID查询 临时订单信息包含商品信息
BoundHashOperations<String, String, OrderRecode> hashOps = redisTemplate.boundHashOps(RedisConst.SECKILL_ORDERS);
//1.1 获取临时订单
OrderRecode orderRecode = hashOps.get(userId);
if (orderRecode == null) {
return Result.build(null, ResultCodeEnum.ILLEGAL_REQUEST);
}
//1.2 获取秒杀商品
SeckillGoods seckillGoods = orderRecode.getSeckillGoods();
if (seckillGoods == null) {
return Result.build(null, ResultCodeEnum.ILLEGAL_REQUEST);
}
//2.构建秒杀订单对象以及秒杀商品明细集合
//2.1 构建订单
OrderInfo orderInfo = new OrderInfo();
//2.2 构建订单明细
OrderDetail orderDetail = new OrderDetail();
orderDetail.setSkuName(seckillGoods.getSkuName());
orderDetail.setOrderPrice(seckillGoods.getCostPrice());
orderDetail.setImgUrl(seckillGoods.getSkuDefaultImg());
orderDetail.setSkuId(seckillGoods.getSkuId());
orderDetail.setSkuNum(orderRecode.getNum());
List<OrderDetail> orderDetails = Arrays.asList(orderDetail);
orderInfo.setOrderDetailList(orderDetails);
//计算订单总金额
orderInfo.sumTotalAmount();
//3.远程调用用户微服务得到收件地址列表
List<UserAddress> userAddressList = userFeignClient.findUserAddressListByUserId(Long.valueOf(userId));
//4.封装响应数据Map
HashMap<String, Object> resultMap = new HashMap<>();
resultMap.put("detailArrayList", orderDetails);
resultMap.put("totalNum", orderDetails.size());
resultMap.put("totalAmount", orderInfo.getTotalAmount());
resultMap.put("userAddressList", userAddressList);
return Result.ok(resultMap);
}
ActivityFeignClient
/**
* 秒杀订单确认页面渲染需要参数汇总接口
*
* @return
*/
@GetMapping("/api/activity/seckill/auth/trade")
public Result<Map<String, Object>> seckillTradeData();
SeckillController
/**
* 确认订单
* @param model
* @return
*/
@GetMapping("seckill/trade.html")
public String trade(Model model) {
Result<Map<String, Object>> result = activityFeignClient.seckillTradeData();
if(result.isOk()){
model.addAllAttributes(result.getData());
return "seckill/trade";
}else{
model.addAttribute("message", result.getMessage());
return "seckill/fail";
}
}
该页面与正常下单页面类似,只是下单提交接口不一样,因为秒杀下单不需要正常下单的各种判断,因此我们要在订单服务提供一个秒杀下单接口,直接下单
YAPI接口地址:http://192.168.200.128:3000/project/11/interface/api/795
OrderApiController
/**
* 秒杀提交订单,秒杀订单不需要做前置判断,直接下单
*
* @param orderInfo
* @return
*/
@PostMapping("inner/seckill/submitOrder")
public Long submitSeckillOrder(@RequestBody OrderInfo orderInfo) {
return orderInfoService.submitSeckillOrder(orderInfo);
}
OrderInfoService
/**
* 秒杀订单保存
* @param orderInfo
* @return
*/
Long submitSeckillOrder(OrderInfo orderInfo);
OrderInfoServiceImpl
/**
* 保存秒杀订单方法
*
* @param orderInfo
* @return
*/
@Override
public Long submitSeckillOrder(OrderInfo orderInfo) {
//保存秒杀订单
this.saveOrderInfo(orderInfo);
//发送延迟关闭订单消息
rabbitService.sendDelayMessage(MqConst.EXCHANGE_DIRECT_ORDER_CANCEL, MqConst.ROUTING_ORDER_CANCEL, orderInfo.getId(), 15 * 60);
//返回保存后订单ID
return orderInfo.getId();
}
/**
* 抽取出来保存订单方法
*
* @param orderInfo
*/
private void saveOrderInfo(OrderInfo orderInfo) {
List<OrderDetail> orderDetails = orderInfo.getOrderDetailList();
//3.1 封装订单相关属性
orderInfo.setOrderStatus(OrderStatus.UNPAID.name());
orderInfo.sumTotalAmount();
orderInfo.setPaymentWay(PaymentWay.ONLINE.name());
String outTradeNo = "ATGUIGU" + System.currentTimeMillis() + new Random().nextInt(1000);
orderInfo.setOutTradeNo(outTradeNo);
orderInfo.setProcessStatus(ProcessStatus.UNPAID.name());
StringBuilder stringBuilder = new StringBuilder();
for (OrderDetail orderDetail : orderDetails) {
stringBuilder.append(orderDetail.getSkuName() + " ");
}
if (stringBuilder.toString().length() > 100) {
orderInfo.setTradeBody(stringBuilder.toString().substring(0, 100));
} else {
orderInfo.setTradeBody(stringBuilder.toString());
}
orderInfo.setImgUrl(orderDetails.get(0).getImgUrl());
orderInfo.setOperateTime(new Date());
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.DATE, 1);
orderInfo.setExpireTime(calendar.getTime());
//3.2 将订单保存
this.save(orderInfo);
//3.3 封装订单详情对象 保存订单详情
List<OrderDetail> orderDetailList = orderDetails.stream().map(orderDetail -> {
orderDetail.setOrderId(orderInfo.getId());
return orderDetail;
}).collect(Collectors.toList());
//3.4 批量新增订单详情
if (!CollectionUtils.isEmpty(orderDetailList)) {
orderDetailService.saveBatch(orderDetailList);
}
//TODO 4.购物车中中结算商品删除 作业
//5.返回订单ID
}
远程调用API接口方法
/**
* 秒杀提交订单,秒杀订单不需要做前置判断,直接下单
*
* @param orderInfo
* @return
*/
@PostMapping("/api/order/inner/seckill/submitOrder")
public Long submitSeckillOrder(@RequestBody OrderInfo orderInfo);
服务降级方法
@Override
public Long submitSeckillOrder(OrderInfo orderInfo) {
return null;
}
SeckillGoodsApiController
/**
* 保存秒杀订单
* @param orderInfo
* @return
*/
@PostMapping("/auth/submitOrder")
public Result submitSeckillOrder(HttpServletRequest request, @RequestBody OrderInfo orderInfo){
String userId = AuthContextHolder.getUserId(request);
orderInfo.setUserId(Long.valueOf(userId));
return seckillGoodsService.submitSeckillOrder(orderInfo);
}
SeckillGoodsService
/**
* 保存秒杀订单
* @param orderInfo
* @return
*/
Result submitSeckillOrder(OrderInfo orderInfo);
SeckillGoodsServiceImpl
/**
* 保存秒杀订单
* @param orderInfo
* @return
*/
@Override
public Result submitSeckillOrder(OrderInfo orderInfo) {
Long userId = orderInfo.getUserId();
//1.远程调用订单微服务保存秒杀订单
Long orderId = orderFeignClient.submitSeckillOrder(orderInfo);
//2.删除Redis中临时订单
redisTemplate.boundHashOps(RedisConst.SECKILL_ORDERS).delete(userId.toString());
//3.将用户下单记录存入缓存Redis
redisTemplate.boundHashOps(RedisConst.SECKILL_ORDERS_USERS).put(userId.toString(), orderId.toString());
//4.返回保存后订单ID - 跟支付页面进行对接
return Result.ok(orderId);
}
页面提交订单代码片段
submitOrder() {
seckill.submitOrder(this.order).then(response => {
if (response.data.code == 200) {
window.location.href = 'http://payment.gmall.com/pay.html?orderId=' + response.data.data
} else {
alert(response.data.message)
}
})
},
说明:下单成功后,后续流程与正常订单一致
秒杀过程中我们写入了大量redis缓存,我们可以在秒杀结束或每天固定时间清除缓存,释放缓存空间;
实现思路:假如根据业务,我们确定每天18点所有秒杀业务结束,那么我们编写定时任务,每天18点发送mq消息,service-activity模块监听消息清理缓存
service-task发送消息
/**
* 定时任务
*/
public static final String ROUTING_TASK_18 = "seckill.task.18";
//队列
public static final String QUEUE_TASK_18 = "queue.task.18";
service-task
模块ScheduledTask增加定时任务
/**
* 每天晚上18点发送消息,通知秒杀服务清理Redis缓存
*/
//@Scheduled(cron = "0 0 18 * * ?") //正式
@Scheduled(cron = "0/30 * * * * ?")
public void sendClearSeckillGoodsCache() {
log.info("定时任务执行了");
rabbitService.sendMessage(MqConst.EXCHANGE_DIRECT_TASK, MqConst.ROUTING_TASK_18, "");
}
Service-activity接收消息
SeckillReceiver
/**
* 监听清理Redis缓存中秒杀相关数据
*
* @param message
* @param channel
*/
@RabbitListener(bindings = @QueueBinding(
value = @Queue(value = MqConst.QUEUE_TASK_18, durable = "true", autoDelete = "false"),
exchange = @Exchange(value = MqConst.EXCHANGE_DIRECT_TASK),
key = {MqConst.ROUTING_TASK_18}
))
public void deleteRedisData(Message message, Channel channel) {
try {
//1.查询秒杀结束商品
LambdaQueryWrapper<SeckillGoods> queryWrapper = new LambdaQueryWrapper<>();
queryWrapper.eq(SeckillGoods::getStatus, 1);
queryWrapper.le(SeckillGoods::getEndTime, new Date());
List<SeckillGoods> seckillGoodsList = seckillGoodsService.list(queryWrapper);
if (!CollectionUtils.isEmpty(seckillGoodsList)) {
//2.对应将秒杀结束缓存中的数据删除!
for (SeckillGoods seckillGoods : seckillGoodsList) {
//2.1 删除商品库存 list
redisTemplate.delete(RedisConst.SECKILL_STOCK_PREFIX + seckillGoods.getSkuId());
//2.2 删除秒杀商品 hash
redisTemplate.delete(RedisConst.SECKILL_GOODS);
//2.3 删除秒杀期间产生的临时订单 hash
redisTemplate.delete(RedisConst.SECKILL_ORDERS);
//2.4 删除秒杀成功的订单
redisTemplate.delete(RedisConst.SECKILL_ORDERS_USERS);
//3.修改数据库中秒杀商品的状态 1:审核通过 2:秒杀结束
seckillGoods.setStatus("2");
seckillGoodsService.updateById(seckillGoods);
}
}
// 手动确认消息
channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
} catch (IOException e) {
e.printStackTrace();
}
}
说明:清空redis缓存,同时更改秒杀商品活动结束
秒杀下单,提交成功,页面通过轮询后台方法查询秒杀状态