文件上传功能实现

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https://blog.youkuaiyun.com/everyonetimeismoney/article/details/94412711

// 解决跨域请求问题

@CrossOrigin(origins = “http://xxxxx.xxxxx.com”, methods = RequestMethod.POST, allowCredentials = "true")
@ResponseBody
@RequestMapping("/upFile")
public BaseResult xxxxxYzzz(@RequestParam("fileData") MultipartFile file) {