在网上搜索到下载方法，总是有一些问题，浪费了一些时间.
1.response.reset();//清除首部的空白行
没加这个导致文件莫名其妙的多出0.01 KB之类，像音频文件直接导致不能使用
/** * 网页文件下载 * @param response * @param fileName 文件名 * @param contents */ public void downloadFile(HttpServletResponse response, String fileName, byte[] contents) { if (fileName != null && contents.length !=0) { response.reset();//清除首部的空白行 response.setHeader("content-type", "application/octet-stream"); response.setContentType("application/octet-stream"); try { response.setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(fileName, "UTF-8")); } catch (UnsupportedEncodingException e) { e.printStackTrace(); writeLog("downloadFile_response_set:"+e); } byte[] buffer = new byte[1024]; BufferedInputStream bis = null; try { bis = new BufferedInputStream(new ByteArrayInputStream(contents)); OutputStream os = response.getOutputStream(); int i ; while ((i= bis.read(buffer)) != -1) { os.write(buffer, 0, i); } os.flush(); } catch (Exception e) { e.printStackTrace(); } finally { if (bis != null) { try { bis.close(); } catch (IOException e) { e.printStackTrace(); } } } } }
