问题总结

1. FileOperationTool.copy(uploadify, new File(desFilePath));  
2.             HttpServletResponse response = ServletActionContext.getResponse();  
3.             response.setCharacterEncoding("utf-8"); // 务必，防止返回文件名是乱码  
4.   
5.             try {  
6.                 response.getWriter().print(uploadifyFileName + " 上传成功");  
7.             } catch (IOException e) {  
8.                 // TODO Auto-generated catch block  
9.                 e.printStackTrace();  
10.             }// 向页面端返回结果信息  
11.             return null;  

[C#] 

file.SaveAs(uploadPath + file.FileName);
//下面这句代码缺少的话，上传成功后上传队列的显示不会自动消失
context.Response.Write("1");