『壹』 java怎麼獲取ip地址
java獲取ip地址
public static void main(String[] args) { try { // 獲取計算機名 String name = InetAddress.getLocalHost().getHostName(); // 獲取IP地址 String ip = InetAddress.getLocalHost().getHostAddress(); System.out.println("計算機名："+name); System.out.println("IP地址："+ip); } catch (UnknownHostException e) { System.out.println("異常：" + e); e.printStackTrace(); } }
『貳』 java 判斷ip地址是否有效
寫正則表達式啊
public class IPAddressValidator{
private Pattern pattern;
private Matcher matcher;
private static final String IPADDRESS_PATTERN =
"^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." +
"([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." +
"([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." +
"([01]?\\d\\d?|2[0-4]\\d|25[0-5])$";
public IPAddressValidator(){
pattern = Pattern.compile(IPADDRESS_PATTERN);
}
public boolean validate(final String ip){
matcher = pattern.matcher(ip);
return matcher.matches();
}
}