java判斷是否是ip
java采用正則判斷字符串是否是ip的方法如下：
1、Java源碼
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* @類名:IpAddress
* @描述:用正則表達(dá)式判斷是否為IP
* @Author：Administrator
* @date: 2014年3月4日 下午10:55:06
*/
public class IpAddress {
public static class IpAdd {
public boolean isIP(String addr) {
if (addr.length() < 7 || addr.length() > 15 || "".equals(addr)) {
return false;
}
/**
* 判斷IP格式和范圍
*/
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;
}
}
}2、使用
/**
* @Description : IP可能的范圍是0-255.0-255.0-255.0-255
* @param args
*/
public static void main(String[] args) {
/**
* 符合IP地址的范圍
*/
String oneAddress = "10.127.30.45";
/**
* 符合IP地址的長度范圍但是不符合格式
*/
String twoAddress = "127.30.45";
/**
* 不符合IP地址的長度范圍
*/
String threeAddress = "7.0.4";
/**
* 不符合IP地址的長度范圍但是不符合IP取值范圍
*/
String fourAddress = "255.255.255.2567";
IpAdd ipAdd = new IpAdd();
//判斷oneAddress是否是IP
System.out.println(ipAdd.isIP(oneAddress));
//判斷twoAddress是否是IP
System.out.println(ipAdd.isIP(twoAddress));
//判斷threeAddress是否是IP
System.out.println(ipAdd.isIP(threeAddress));
//判斷fourAddress是否是IP
System.out.println(ipAdd.isIP(fourAddress));
}3、運(yùn)行結(jié)果
true false false false
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