public String excelDomnload() throws Exception{

		try{

			/*

			String path = GlobalKeys.getFunctionConfig("user_attach_save","/opt/tmp/");

			RegUser ru = ((RegUserLoginInfo) request.getSession().getAttribute(GlobalKeys.REG_USER_IN_SESSION_NAME)).getRegUser();

			String tmpPath = File.separator + "import" + File.separator

			+ ru.getName() + File.separator;

			File targetFolder = new File(path, tmpPath);//合并两个路经

			String fName = request.getParameter("fName");

			*/

			response.setContentType("application/msexcel;");

			response.setHeader("Content-Disposition", new String(("attachment;filename="+"error.xls").getBytes("GB2312"), "UTF-8"));

			File f = new File("d:/20121211165820140_err.xls");

			//File f = new File(targetFolder.getPath()+File.separator+fName);

			FileInputStream in = new FileInputStream(f);

			byte b[] = new byte[1024];

			int i = 0;

			ServletOutputStream out = response.getOutputStream();

			while((i=in.read(b))!=	-1){

				out.write(b, 0, i);

			}

			out.flush();

			out.close();

		    in.close();

		}catch(Exception e){

	        e.printStackTrace();

		}

		return null;

	}