JAVA文件下载中文名称乱码解决方案

    public static String convert(HttpServletRequest request, String fileName) {
        if (fileName == null) {
            throw new IllegalArgumentException("输入参数是null");
        }
        try{
        	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("Safari")) {  
        		return new String(fileName.getBytes("utf-8"), "ISO8859-1");  
        	}else if (null != agent && -1 != agent.indexOf("Mozilla")) {  
        		return "=?UTF-8?B?"+(new String(Base64.encodeBase64(fileName.getBytes("UTF-8"))))+"?=";  
        	}  else {  
        		return fileName;  
        	}
        }catch(UnsupportedEncodingException ex){
        	return fileName;
        }
    }