知识点补充：
find()方法是部分匹配，是查找输入串中与模式匹配的子串，如果该匹配的串有组还可以使用group()函数。
matches()是全部匹配，是将整个输入串与模式匹配，如果要验证一个输入的数据是否为数字类型或其他类型，一般用matches()。
Pattern类的作用在于编译正则表达式后创建一个匹配模式。
Matcher类使用Pattern实例提供的模式信息对正则表达式进行匹配。
判断方法：
首先判断数据的长度是否符合ip长度，然后定义正则表达式，使用方法“compile”编译正则表达式并创建匹配模式，接着使用“matcher()”方法根据匹配模式进行匹配即可。
示例如下：
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;
}
}推荐教程：java快速入门
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