ajax上传文件（javaweb）
前台：FormData, formData.append("fileName",$("#file")[0].files[0];);
https://www.cnblogs.com/cckui/p/9887550.html
后台：MultipartHttpServletRequest .getFile("fileName")
https://blog.csdn.net/weixin_41162263/article/details/81208948
前台：FormData, formData.append("fileName",$("#file")[0].files[0];);
https://www.cnblogs.com/cckui/p/9887550.html
后台：MultipartHttpServletRequest .getFile("fileName")
https://blog.csdn.net/weixin_41162263/article/details/81208948
