struts的FormFile上传资料

/**
	 * 利用struts的FormFile上传图片
	 * @param mapping
	 * @param actionForm
	 * @param request
	 * @param response
	 * @return
	 * @throws Exception
	 */
	public ActionForward upload(ActionMapping mapping, ActionForm actionForm,
			HttpServletRequest request, HttpServletResponse response) throws Exception {
		AdvertiseForm advertiseForm = (AdvertiseForm) actionForm;
		FormFile file=advertiseForm.getFormFile("picFile");
		try{
			String filename=FileBean.uploadFile(this.getServlet(),IConstants.UPLOAD_PATH, file, request,true);
			System.out.println("上次的文件名称为："+filename);
			response.getWriter().print(filename);
		}catch (Exception e) {
			e.printStackTrace();
			response.getWriter().print("上传失败!");
		}
		return null;
	}

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private FormFile picFile;//actionForm里面要设置

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public static String uploadFile(HttpServlet servlet,String path,FormFile file,  HttpServletRequest request,boolean flag){
		String fileName=getExtention(file.getFileName());
		if(file==null){
			return "";
		}
		if(flag){
//			String webapps=request.getRealPath("/");
//			webapps=webapps.substring(0,webapps.lastIndexOf("webapps")+"webapps".length());
//			path=webapps+path;
			path = request.getRealPath("/")+path;
		}
		else path=request.getRealPath("/")+"/resentFiles";
		InputStream streamin = null;
		OutputStream bos = null;
		try{
			File filepath = new File(path);
			if (!filepath.exists()) {
				filepath.mkdirs();
			}
			fileName=GUID.getInstance().get16()+fileName;
			streamin = file.getInputStream();
			bos = new FileOutputStream(path +"/"+fileName);
			int bytesRead= 0;
			byte[] sum = new byte[8192];
			int i=0;
			while ((bytesRead = streamin.read(sum, 0, 8192)) != -1)
			{
				i=i+bytesRead;
				bos.write(sum, 0, bytesRead);
			}           
		}catch (Exception e) {
			e.printStackTrace();
		}finally{
			try {
				if(bos!=null){
					bos.close();
				}
				if(streamin!=null){
					streamin.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return fileName;
	}

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private static String getExtention(String fileName)  {
        int pos = fileName.lastIndexOf(".");
        if(pos<1){
        	return null;
        }
        return fileName.substring(pos,fileName.length());
    }

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