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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();
????????}
????}