struts实现下载文件关键代码

来源：互联网发布：王者荣耀网络状态出错编辑：程序博客网时间：2024/04/29 14:33

//下载生成的文件到客户端
  response.setHeader("pragma","no-cache");
  response.setHeader("cache-control","no-cache");
  response.setDateHeader("Expires",0);
  //设置编码
  request.setCharacterEncoding("UTF-8");

  String fileName ="bossXML.zip";//request.getParameter("fileName");
  //取到文件
  File file = new File("d:/" + fileName);
  response.reset();
  //response.setContentType("application/octet-stream;charset=UTF-8");
  response.setContentType("application/octet-stream;charset=GBK");//解决在弹出文件下载框不能打开文件的问题

  //一定要对fileName进行encode
  //response.addHeader("Content-Disposition", "attachment; filename=" + java.net.URLEncoder.encode(fileName, "UTF-8"));
  response.addHeader("Content-Disposition", "attachment; filename=" + new String(fileName.getBytes("GBK"),"ISO8859-1"));//解决在弹出文件下载框不能打开文件的问题
  response.setContentLength((int) file.length());

  byte[] buffer = new byte[4096];
  BufferedOutputStream output = null;
  BufferedInputStream input = null;

  // 写缓冲区：
  try {
      output = new BufferedOutputStream(response.getOutputStream());
      input = new BufferedInputStream(new FileInputStream(file));

      int n = (-1);
      while ((n = input.read(buffer, 0, 4096)) > -1) {
          output.write(buffer, 0, n);
      }
      response.flushBuffer();
  }
  catch (Exception e) {
  }
  finally {
      if (input != null) input.close();
      if (output != null) output.close();
  }
  return null;
}