Java에서 데이터가 IP인지 확인하는 방법

package com.you.dao;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class IpAddress   
{
public static class IpAdd  
{
public boolean isIP(String addr)  
{
if(addr.length() < 7 || addr.length() > 15 || "".equals(addr))
{
return false;
}
/** 
             * 判断IP格式和范围 
             */  
String rexp = "([1-9]|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3}";
Pattern pat = Pattern.compile(rexp);
Matcher mat = pat.matcher(addr);
boolean ipAddress = mat.find();
return ipAddress;
}
}