1,
<a href="后台文件的url路径">下载</a>
单击下载链接,浏览器就会弹出文件下载提示。如果浏览器认为自己可以打开,也许会直接打开
2,
访问后台action或controller或servlet,
获取response.getOutputStream();
获取到后台文件的输入流
输出到输出流(response会带OutputStream到客户端浏览器,浏览器会自动获取)
代码:
@RequestMapping("/FileManager_download.jspx") public void fileDownload(HttpServletRequest request, HttpServletResponse response, String fileName, String fileUrl) throws Exception { String filename = new String(fileName.getBytes("ISO-8859-1"),"utf-8");//浏览器传递数据时久不用编码啦 System.out.println(filename); String downloadFileDir = request.getSession().getServletContext() .getRealPath("downLoadFile"); String srcFileName = fileUrl.substring(fileUrl.lastIndexOf("/") + 1, fileUrl.length()); File file = new File(downloadFileDir, srcFileName); InputStream inputStream = null; OutputStream outputStream = null; byte[] b = new byte[1024]; int len = 0; if (file.exists()) { inputStream = new FileInputStream(file); outputStream = response.getOutputStream(); response.setContentType("application/force-download"); response.addHeader("Content-Disposition", "attachment; filename=" +new String(filename.getBytes("UTF-8"),"ISO-8859-1"));//为什么ISO-8859-1到前台不会出现乱码呢??? response.setContentLength((int) file.length()); while ((len = inputStream.read(b)) != -1) { outputStream.write(b, 0, len); } } if (inputStream != null) { try { inputStream.close(); } catch (IOException e) { } } if (outputStream != null) { try { outputStream.close(); } catch (IOException e) { e.printStackTrace(); } } }
http://blog.csdn.net/tianping168/article/details/2698221