http://struts.apache.org/dtds/struts-config_1_2.dtd">
 
 
                  type="com.xinglongjian.struts.fileupload.FileUploadForm" />
 
 
 
 
 
 
              type="com.xinglongjian.struts.fileupload.FileUploadAction" >
             
       
 

第三步：FileUploadForm.java

public class FileUploadForm. extends ActionForm
{
 private FormFile filePath; //类型为FormFile，变量filePath与页面的file名称一致。

 public FormFile getFilePath()
 {
  return filePath;
 }

 public void setFilePath(FormFile filePath)
 {
  this.filePath = filePath;
 }
 
}

第四步：FileUploadAction.java

public class FileUploadAction extends DispatchAction
{
 /**
  * 上传文件
  * @param mapping
  * @param form
  * @param request
  * @param response
  * @return
  * @throws Exception
  */
 public ActionForward upload(ActionMapping mapping, ActionForm. form, HttpServletRequest request, HttpServletResponse response)throws Exception
 {
  FileUploadForm. fileForm=(FileUploadForm)form;
  FormFile file=fileForm.getFilePath();
  String realPath=this.getServlet().getServletContext().getRealPath("/fileload");
  if(file==null)
   return mapping.findForward("error");
  String filename=file.getFileName();
  int size=file.getFileSize();
  if(size>1024*1024)
   return mapping.findForward("error");
  InputStream is=null;
  BufferedOutputStream bs=null;
  try
  {
   //get a inputstream object form. uploadFile
   is=file.getInputStream();
   bs=new BufferedOutputStream(new FileOutputStream(realPath+"/"+filename));
   byte[] buffer=new byte[20480];
   int count=0;
   while((count=is.read())!=-1)
    bs.write(buffer, 0, count);
  }
  catch (Exception e)
  {
   e.printStackTrace();
  }
  finally
  {
   bs.flush();
   bs.close();
   is.close();
  }
  
  return mapping.findForward("success");
 }
 /**
  * 下载文件
  * @param mapping
  * @param form
  * @param request
  * @param response
  * @return
  * @throws Exception
  */
 public ActionForward download(ActionMapping mapping, ActionForm. form, HttpServletRequest request, HttpServletResponse response)throws Exception
 {
  String path=request.getParameter("path");
  String realPath=this.getServlet().getServletContext().getRealPath("/"+path);
  
  File uploadFile=new File(realPath);
  InputStream is=new FileInputStream(uploadFile);
  OutputStream s=response.getOutputStream();
  
  BufferedInputStream bis=new BufferedInputStream(is);
  BufferedOutputStream bos=new BufferedOutputStream(os);
  //弹出下载对话框的代码
  response.setHeader("Content-disposition", "attachment;filename="+URLEncoder.encode(path,"utf-8"));
  int bytesRead=0;
  byte[] buffer=new byte[8192];
  while((bytesRead=bis.read(buffer, 0, 8192))!=-1)
   bos.write(buffer, 0, bytesRead);
  bos.close();
     is.close();
     bis.close();
     os.close();
  return null;
 }
}