火狐浏览器下载乱码问题

public static String encodeChineseDownloadFileName(HttpServletRequest request,
			String pFileName) {
		//判断浏览器类型 火狐编码处理 pFileName = new String(pFileName.getBytes("utf-8"), "iso-8859-1");
		String agent = request.getHeader("USER-AGENT");
		try {
			if (null != agent && -1 != agent.indexOf("MSIE")) {
				pFileName = URLEncoder.encode(pFileName, "utf-8");
			} else {
				pFileName = new String(pFileName.getBytes("utf-8"), "iso-8859-1");
			}
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return pFileName;
	}