java判断是否是ip
java采用正则判断字符串是否是ip的方法如下:
1、Java源码
import java.util.regex.Matcher; import java.util.regex.Pattern; /** * @类名:IpAddress * @描述:用正则表达式判断是否为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; } } }
2、使用
/** * @Description : IP可能的范围是0-255.0-255.0-255.0-255 * @param args */ public static void main(String[] args) { /** * 符合IP地址的范围 */ String oneAddress = "10.127.30.45"; /** * 符合IP地址的长度范围但是不符合格式 */ String twoAddress = "127.30.45"; /** * 不符合IP地址的长度范围 */ String threeAddress = "7.0.4"; /** * 不符合IP地址的长度范围但是不符合IP取值范围 */ String fourAddress = "255.255.255.2567"; IpAdd ipAdd = new IpAdd(); //判断oneAddress是否是IP System.out.println(ipAdd.isIP(oneAddress)); //判断twoAddress是否是IP System.out.println(ipAdd.isIP(twoAddress)); //判断threeAddress是否是IP System.out.println(ipAdd.isIP(threeAddress)); //判断fourAddress是否是IP System.out.println(ipAdd.isIP(fourAddress)); }
3、运行结果
true false false false
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