/* JS验证IP是否合法 */
function isIP(strIP) {
	var re=/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/g; // 匹配IP地址的正则表达式
	if(re.test(strIP))
		if( RegExp.$1 <256 && RegExp.$2<256 && RegExp.$3<256 && RegExp.$4<256) 
			return true;
	return false;
}

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/*Java 验证Ip是否合法*/
public static boolean isIPAddress(String ipaddr) {
	boolean flag = false;
	Pattern pattern = Pattern.compile("\\b((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\.((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\.((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\.((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\b");
	Matcher m = pattern.matcher(ipaddr);
	flag = m.matches();
	return flag;
}