这个是入门spring mvc的Demo，是我学习spring mvc时写的，实现了spring mvc的输入校验，上传文件，和返回json数据时的配置，感觉对于初学者很有帮助-This is the entry of spring mvc Demo, my spring mvc learning to write, to achieve a spring mvc input validation, upload files, and configure the return json data

MyEcplise平台，利用JSON上传下载数据到helloservlet(MyEcplise platform, upload and download data to helloservlet by JSON.)