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;  
    }  
  }