java代码文件下载实现

@RequestMapping(value = "/download") @ResponseBody public void download(HttpServletRequest request,HttpServletResponse response) throws FileNotFoundException { //获得服务器端文件保存路径 String realPath = request.getSession().getServletContext().getRealPath("/"); String path = realPath+"文件.txt"; //下载 try { // path是指欲下载的文件的路径。 File file = new File(path); // 获得文件名。 String filename = file.getName(); // 获得文件的后缀名。 String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase(); // 以流的情势下载文件。 InputStream fis = new BufferedInputStream(new FileInputStream(path)); byte[] buffer = new byte[fis.available()]; fis.read(buffer); fis.close(); // 清空response response.reset(); // 设置response的Header response.addHeader("Content-Disposition","attachment;filename=" + new String(filename.getBytes("gb2312"),"ISO8859⑴")); response.addHeader("Content-Length","" + file.length()); OutputStream toClient = new BufferedOutputStream(response.getOutputStream()); response.setContentType("application/octet-stream"); toClient.write(buffer); toClient.flush(); toClient.close(); } catch (IOException ex) { ex.printStackTrace(); } }