[Struts] struts1.x下载文件完成后跳转到成功画面

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[Struts] struts1.x下载文件完成后跳转到成功画面20

   看了好多网上用struts1.x实现文件下载功能的介绍了
   action的写法大致有三 1，用输入流，输出流
                          2，用dispatcher
                      3，用downloadAction
   可是，怎么没看见个下载完成后跳转到成功画面的写法呢
   用了第一和第二两种写法，最后都只能return null,如果写成return mapping.findForward("success"),则都会因为response已经提交而报exception
   莫非都是下载完了就什么也不管了？
   很疑惑，不知道怎么办好？有解决方法么，或者非正规的解决方法也好

问题补充：

这段代码也是我从论坛上看来的，下载没有问题，画面forward不可

   		public ActionForward execute(ActionMapping mapping, ActionForm form,
	            HttpServletRequest request, HttpServletResponse response)  {
			
			FileDownLoadForm fdform =(FileDownLoadForm)form;
			String path = fdform.getFilePath();
			
			BufferedInputStream   bis = null;
			BufferedOutputStream  bos = null;
			InputStream fis = null;
			OutputStream fos = null;
			
			try{

				File uploadFile = new File(path);

		
				fis = new FileInputStream(uploadFile);
				bis = new BufferedInputStream(fis);
				fos = response.getOutputStream();
				bos = new BufferedOutputStream(fos);
				


				response.reset();
				response.setHeader("Content-disposition", "attachment;filename =" + URLEncoder.encode(path, "utf-8"));


				int bytesRead = 0;
				byte[] buffer = new byte[4096];
				while((bytesRead = bis.read(buffer,0,4096)) != -1){
					bos.write(buffer, 0, bytesRead);
				}
				bos.flush();
				fis.close();
				bis.close();
				fos.close();
				bos.close();
				//return mapping.findForward("success");
				
				return null;
			} catch(Exception e){
				e.printStackTrace();
				System.out.println(path);
            	ActionMessages downErrors = new ActionMessages();
            	ActionMessage downError =  new ActionMessage("errors.download", path);
            	downErrors.add(ActionMessages.GLOBAL_MESSAGE, downError);
            	saveMessages(request, downErrors);
				return mapping.findForward("error");
			}
			
		}

问题补充：

对应第二种方法的
也是从论坛看来的


	public ActionForward execute(ActionMapping mapping, ActionForm form,
	            HttpServletRequest request, HttpServletResponse response)  {
			FileDownLoadForm fdform =(FileDownLoadForm)form;
			String path = fdform.getFilePath();
			
			
		    response.setContentType("application/x-download");
		    String filenamedownload = path;
		    String filenamedisplay = path.substring(path.lastIndexOf("/")+1);
		   
		    
		    try {
		    	filenamedisplay = URLEncoder.encode(filenamedisplay,"UTF-8");
				response.addHeader("Content-Disposition","attachment;filename=" + filenamedisplay);
		        RequestDispatcher dispatcher = request.getRequestDispatcher(filenamedownload);
		        if(dispatcher != null)
		        {
		            dispatcher.forward(request,response);
		        }
		        response.flushBuffer();

		       return null ;
		       //  return mapping.findForward("success");
		    }
		    catch(Exception e) {
		        e.printStackTrace();
            	ActionMessages downErrors = new ActionMessages();
            	ActionMessage downError =  new ActionMessage("errors.download", path);
            	downErrors.add(ActionMessages.GLOBAL_MESSAGE, downError);
            	saveMessages(request, downErrors);
				return mapping.findForward("error");
		
		    }

		}

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