文件的上传，下载
下载
public ActionForward downkey(ActionMapping mapping,ActionForm form, HttpServletRequest request,HttpServletResponse response) {String path=request.getSession().getServletContext().getRealPath("/")+ "key/";String filepath = request.getParameter("path");response.setContentType("application/octet-stream");response.addHeader("Content-Disposition","attachment;filename="+filepath);try {if (!"".equals(filepath)) {FileInputStream fis = new FileInputStream(path+filepath);ServletOutputStream sos = response.getOutputStream();int i = 0;while ((i = fis.read()) != -1) {sos.write(i);}fis.close();sos.close();}} catch (Exception e) {e.printStackTrace();logger.error("报表下载发生异常:" + e.toString());}return null;}