JavaWeb文件下载功能实例代码

 public void downloadFile(File file, String downName, HttpServletRequest request, HttpServletResponse response) { OutputStream out = null; FileInputStream fin = null; BufferedInputStream bin = null; try { if (file.exists()) { String finalFileName = null; String agent = request.getHeader("User-Agent"); boolean isMSIE = (agent != null && agent.indexOf("MSIE") != -1); if (isMSIE) { finalFileName = URLEncoder.encode(downName, "UTF8"); } else { finalFileName = new String(downName.getBytes("UTF-8"), "ISO-8859-1"); } response.setContentType("application/x-msdownload"); response.setHeader("Content-Disposition", "attachment; filename=".concat(finalFileName)); out = response.getOutputStream(); fin = new FileInputStream(file); bin = new BufferedInputStream(fin); for (int data = bin.read(); data > -1; data = bin.read()) { out.write(data); } } else { } } catch (Exception e) { e.printStackTrace(); } finally { try { if (bin != null) bin.close(); if (fin != null) fin.close(); if (out != null) out.close(); } catch (Exception e2) { e2.printStackTrace(); } } }