protected void doPost(HttpServletRequest request, HttpServletResponse response)   throws ServletException, IOException {   String browser = "";   String fileName = "測試.txt";   try {    browser = request.getHeader("User-Agent");    if (-1 < browser.indexOf("MSIE 6.0") || -1 < browser.indexOf("MSIE 7.0")) {     // IE6, IE7 瀏覽器     response.addHeader("content-disposition", "attachment;filename="       + new String(fileName.getBytes(), "ISO8859-1"));    } else if (-1 < browser.indexOf("MSIE 8.0")) {     // IE8      response.addHeader("content-disposition", "attachment;filename="       + URLEncoder.encode(fileName, "UTF-8"));    } else if (-1 < browser.indexOf("MSIE 9.0")) {     // IE9     response.addHeader("content-disposition", "attachment;filename="       + URLEncoder.encode(fileName, "UTF-8"));    } else if (-1 < browser.indexOf("Chrome")) {     // 谷歌     response.addHeader("content-disposition",       "attachment;filename*=UTF-8''" + URLEncoder.encode(fileName, "UTF-8"));    } else if (-1 < browser.indexOf("Safari")) {     // 蘋果     response.addHeader("content-disposition", "attachment;filename="       + new String(fileName.getBytes(), "ISO8859-1"));    } else {     // 火狐或者其他的瀏覽器     response.addHeader("content-disposition",       "attachment;filename*=UTF-8''" + URLEncoder.encode(fileName, "UTF-8"));    }   } catch (Exception e) {    e.printStackTrace();   }   InputStream in = new FileInputStream("D://test.txt");//獲取文件輸入流    int len = 0;    byte[] buffer = new byte[1024];    OutputStream out = response.getOutputStream();    while ((len = in.read(buffer)) > 0) {     out.write(buffer,0,len);//將緩沖區的數據輸出到客戶端瀏覽器    }    in.close();    out.flush();    out.close(); }