实现下载

这个下载方式是这么样的&＃xff0c;可以适用于很多情况&＃xff1a;

jsp页面点击某个按钮&＃xff0c;实现下载&＃xff1b;

jsp页面一加载完就下载&＃xff1b;

演示一个一加载完就实现下载的&＃xff1a;

实现跳转到另一个url上&＃xff0c;

&＃64;RequestMapping(value&＃61;"/{id}/down")public String down(&＃64;PathVariable long id,HttpServletRequest request,HttpServletResponse response){String rootPath&＃61; ...; File file &＃61; new File(rootPath);this.setResponse(response, request, null, rootPath);this.copyFileToResponse(response, file);return null;}

protected void setResponse(HttpServletResponse response, HttpServletRequest request, String mime, String fileName) {if (!Strings.isNullOrEmpty(mime)) {response.setContentType(mime);} else {response.setContentType("application/octet-stream;charset&＃61;ISO-8859-1");}if (!Strings.isNullOrEmpty(fileName)) {try {// 判断是否为IEif (request.getHeader("USER-AGENT").toLowerCase().indexOf("msie") > 0) {response.setHeader("Content-disposition", "attachment;filename&＃61;" &＃43; URLEncoder.encode(fileName, "UTF8"));}else{response.setHeader("Content-disposition","attachment;filename&＃61;" &＃43; new String(fileName.getBytes("utf-8"), "iso-8859-1"));}} catch (UnsupportedEncodingException e) {e.printStackTrace();}} else {response.setHeader("Content-Disposition", "attachment; filename&＃61;");}}

protected void copyFileToResponse(HttpServletResponse response, File file) {OutputStream to;try {to &＃61; response.getOutputStream();Files.copy(file, to);to.flush();response.flushBuffer();} catch (IOException e) {e.printStackTrace();}}