目录前言什么是幂等性？幂等性控制的三大核心手段1、数据库唯一索引控制（经典可靠）原理适用场景实现Java 代码示例总结2、Redis 防重复提交（轻量方案）原理适用场景Java 实现Controller 示例总结3、幂等 Token 机制
I have a NSMutableArray I get by loading a plist into it. The date field comes in as a string and i want to change it into a nsdate. I can change an nsstring into an nsdate.
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