public static void downLoadFile(InputStream inStream, String fileName)  {    if (StringUtils.isBlank(fileName)) {      fileName = UUID.randomUUID().toString().replaceAll("-", "");    }    HttpServletRequest req = getRequest();    String agent = req.getHeader("User-Agent");    boolean isMSIE = (agent != null) && (agent.indexOf("MSIE") != -1);    try    {      if (isMSIE) {        fileName = URLEncoder.encode(fileName, "UTF-8");        fileName = fileName.replace("+", "%20");      } else {        fileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");      }    } catch (UnsupportedEncodingException e) {      e.printStackTrace();    }    HttpServletResponse response = getResponse();    response.setCharacterEncoding("UTF-8");    response.setHeader("content-disposition", "attachment;filename=\"" + fileName + "\"");    response.setContentType("application/octet-stream");    OutputStream outStream = null;    try {      outStream = response.getOutputStream();      byte[] cache = new byte[1024];      int length = inStream.read(cache);      while (length != -1) {        outStream.write(cache, 0, length);        length = inStream.read(cache);      }    } catch (IOException e) {      e.printStackTrace();      try      {        outStream.flush();      } catch (IOException e) {        e.printStackTrace();      }      try {        outStream.close();      } catch (IOException e) {        e.printStackTrace();      }      try {        inStream.close();      } catch (IOException e) {        e.printStackTrace();      }    }    finally    {      try      {        outStream.flush();      } catch (IOException e) {        e.printStackTrace();      }      try {        outStream.close();      } catch (IOException e) {        e.printStackTrace();      }      try {        inStream.close();      } catch (IOException e) {        e.printStackTrace();      }    }  }

public static HttpServletRequest getRequest()  {    ActionContext ac = ActionContext.getContext();    HttpServletRequest req = null;    if (ac != null) {      req = (HttpServletRequest)ac.get("com.opensymphony.xwork2.dispatcher.HttpServletRequest");    }    return req;  }

public static HttpServletResponse getResponse()  {    ActionContext ac = ActionContext.getContext();    HttpServletResponse response = (HttpServletResponse)ac.get("com.opensymphony.xwork2.dispatcher.HttpServletResponse");    return response;  }