不同浏览器上文件上载，文件名编码有关问题

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/**	 * deal with the fileName encode in the different browsers	 * @param request	 * @param fileName	 * @return	 * @throws UnsupportedEncodingException	 */	private String encodeFileName(HttpServletRequest request, String fileName)			throws UnsupportedEncodingException {		String agent = request.getHeader("USER-AGENT");		if (null != agent && -1 != agent.indexOf("MSIE")) {			return URLEncoder.encode(fileName, "UTF8").replace("+","%20");		} else if (null != agent && -1 != agent.indexOf("Mozilla")) {			return "=?UTF-8?B?"					+ (new String(Base64.encodeBase64(fileName							.getBytes("UTF-8")))) + "?=";		} else {			return fileName;		}	}

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