java文件下载出现文件名乱码解决办法

//IE、chrom、Firefox文件中文乱码问题
    public String processFileName(HttpServletRequest request, String fileNames) {
        String codedfilename = null;
        try {
            String agent = request.getHeader("USER-AGENT");
            if (null != agent && -1 != agent.indexOf("MSIE") || null != agent &&
                    -1 != agent.indexOf("Trident")) {//ie
                String name = java.net.URLEncoder.encode(fileNames, "UTF8");
                codedfilename = name;
            } else if (null != agent&&-1!=agent.indexOf("Mozilla")) {//火狐谷歌等
                codedfilename=new String(fileNames.getBytes("UTF-8"),"iso8859-1");
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return codedfilename;
    }