Java Xss半角转全角防攻击

/**
	 * 将容易引起xss漏洞的半角字符直接替换成全角字符
	 * 
	 * @param s
	 * @return
	 */
	private  String xssEncode(String s) {
		if (s == null || s.equals("")) {
			return s;
		}
		try {
			s = URLDecoder.decode(s, UTF8);
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		for (int i = 0; i < filterChars.length; i++) {
			if(s.contains(filterChars[i])){
				s=s.replace(filterChars[i], replaceChars[i]);
			}
		}
		return s;
	}