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public HttpServletResponse download(String path, HttpServletResponse response) { try { // path是指欲下载的文件的路径。 File file = new File(path); // 取得文件名。 String filename = file.getName(); // 取得文件的后缀名。 String ext = filename.substring(filename.lastIndexOf( " . " ) + 1 ).toUpperCase(); // 以流的形式下载文件。 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())); 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(); } return response; } public void downloadLocal(HttpServletResponse response) throws FileNotFoundException { // 下载本地文件 String fileName = " Operator.doc " .toString(); // 文件的默认保存名 // 读到流中 InputStream inStream = new FileInputStream( " c:/Operator.doc " ); // 文件的存放路径 // 设置输出的格式 response.reset(); response.setContentType( " bin " ); response.addHeader( " Content-Disposition " , " attachment; filename=/ "" + fileName + " / "" ); // 循环取出流中的数 据 byte [] b = new byte [ 100 ]; int len; try { while ((len = inStream.read(b)) > 0 ) response.getOutputStream().write(b, 0 , len); inStream.close(); } catch (IOException e) { e.printStackTrace(); } } public void downloadNet(HttpServletResponse response) throws MalformedURLException { // 下载网络文件 int bytesum = 0 ; int byteread = 0 ; URL url = new URL( " windine.blogdriver.com/logo.gif " ); try { URLConnection conn = url.openConnection(); InputStream inStream = conn.getInputStream(); FileOutputStream fs = new FileOutputStream( " c:/abc.gif " ); byte [] buffer = new byte [ 1204 ]; int length; while ((byteread = inStream.read(buffer)) != - 1 ) { bytesum += byteread; System.out.println(bytesum); fs.write(buffer, 0 , byteread); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }