火狐浏览器下载时文件名为乱码，怎么解决

String agent = request.getHeader("user-agent");
response.setContentType("application/x-download");
if(agent.contains("Firefox"))
    response.addHeader("Content-Disposition","attachment;filename="+ new String(displayFileName.getBytes("GB2312"),"ISO-8859-1"));
else
    response.addHeader("Content-Disposition","attachment;filename=" + URLEncoder.encode(displayFileName, "UTF-8"));

刚刚我也遇到了这个问题，综合上面的回答，发下我的做法，在ＩＥ，谷歌，火狐等浏览器测试没问题！