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代码说明：

  使用session 开发，session使用方便，速度快。这原来是一个国外的朋友开发的类，我只是在这基础上增加了应用部分，也可以在此基础上做更多的扩展，欢迎朋友们使用。(Use development session, session easy to use, fast. It turned out to be a friend overseas development class, I just based on the increase in this part of the application, you can also do more to expand on this basis, welcome friends to use.)