struts中文件的上传与下载

public ActionForward fileUp(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws IOException {
                //获取表单及附件信息
FileForm _fileForm=(FileForm)form;
FormFile file=_fileForm.getFileName();
if(file!=null && file.getFileName().length()>0){
InputStream stream=null;
try{
                               //判断附件是否存在
if(file.getFileSize()==0){
System.out.println("FileNotFoundException had happened");
return mapping.findForward("toIndex");
}
                                //读取附件信息
stream=file.getInputStream();
}catch(FileNotFoundException e){
System.out.println("FileNotFoundException had happened");
return mapping.findForward("toIndex");
}
                       //获取项目的绝对路径
String savePath=request.getRealPath("/");
                       //创建输出流
OutputStream outputStream=new FileOutputStream(savePath+"/file/"+file.getFileName());
int i=-1;
byte[] buffer=new byte[1024];
                        //保存附件
while((i=stream.read(buffer, 0, 1024))!=-1){
outputStream.write(buffer, 0, i);
}
                        //关闭输入输出流
outputStream.close();
stream.close();

//附件下载
try{
                     //读取附件信息
      stream=new FileInputStream(savePath+"/file/"+file.getFileName());
}catch(FileNotFoundException e){
System.out.println("FileNotFoundException had happened");
return mapping.findForward("toIndex");
}
//创建输入流
outputStream=response.getOutputStream();
String fileName=file.getFileName();
                        //设置编码方式
fileName=URLEncoder.encode(fileName,"utf-8");
response.setHeader("Location", fileName);
response.setHeader("Content-Disposition","attachment;filename="+fileName);
response.setContentLength(file.getFileSize());
response.setContentType(file.getContentType());

while((i=stream.read(buffer))!=-1){
outputStream.write(buffer, 0, i);
}
outputStream.flush();
outputStream.close();
stream.close();
}
return mapping.findForward("");
}