设置文件下载时客户端显示的附件中文名

/**
   * 设置下载文件中文件的名称
   * 
   * @param filename
   * @param request
   * @return
   */
  public static String encodeFilename(String filename, HttpServletRequest request) {
    /**
     * 获取客户端浏览器和操作系统信息
     * 在IE浏览器中得到的是：User-Agent=Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; Alexa Toolbar)
     * 在Firefox中得到的是：User-Agent=Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.7.10) Gecko/20050717 Firefox/1.0.6
     */
    String agent = request.getHeader("USER-AGENT");
    try {
      if ((agent != null) && (-1 != agent.indexOf("MSIE"))) {
        String newFileName = URLEncoder.encode(filename, "UTF-8");
        newFileName = StringUtils.replace(newFileName, "+", "%20");
        if (newFileName.length() > 150) {
          newFileName = new String(filename.getBytes("GB2312"), "ISO8859-1");
          newFileName = StringUtils.replace(newFileName, " ", "%20");
        }
        return newFileName;
      }
      if ((agent != null) && (-1 != agent.indexOf("Mozilla")))
        return MimeUtility.encodeText(filename, "UTF-8", "B");

      return filename;
    } catch (Exception ex) {
      return filename;
    }
  }