InetAddress类

import java.net.InetAddress;
import java.net.UnknownHostException;

public class InetAddressDemo {
    public static void main(String[] args) {

        try {
            InetAddress local = InetAddress.getLocalHost();

            System.out.println(local.getHostAddress());// 返回本地主机地址
            System.out.println(local.getHostName());// 主机名

            InetAddress address = InetAddress.getByName("主机名");
            System.out.println(address);

        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }
}