在做一个投票的程序，用户每天可以投三次。我在后台是这样判断的：判断当前日期该用户的记录数是否超过三条。现在如果我通过前台页面可以拿到投票链接，然后短时间内向服务器发送1000000（就是请求数很大）个请求，这样的话可能会出现当天某个用户的记录数不只三次。这个怎么解决？
回复内容：
在做一个投票的程序，用户每天可以投三次。我在后台是这样判断的：判断当前日期该用户的记录数是否超过三条。现在如果我通过前台页面可以拿到投票链接，然后短时间内向服务器发送1000000（就是请求数很大）个请求，这样的话可能会出现当天某个用户的记录数不只三次。这个怎么解决？
使用redis，每次写入前判断当天该用户计数，小于三则写入。redis使用单进程单线程模式，操作都是串行进行，可以满足要求
方案一：事务中使用间隙锁防止幻读
方案二：读取时对每个用户投票纪录只取最早三次
将判断、使用、修改用户的记录数的时候加锁就可以了
楼上说的应该都可以解决这个问题；
说点其他的，没有实践过，也不知道行不行，只是想法，
1、看能不能给投票加一个时间间隔，在一个地方记录上次成功投票的时间戳，然后第二次投票的时候判断时间间隔
2、跟第一个思路差不多，就是在一个地方记录当天的投票次数
然后想了想，这样应该还是存在同样的问题，建议楼主使用楼上说的redis来处理吧，应对起来比较简单
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