java獲取本機ip的方法

1.  inetAddress類

通過InetAddress的實例對象包含以數字形式保存的IP地址，同時還可能包含主機名（如果使用主機名來獲取InetAddress的實例，或者使用數字來構造，並且啓用了反向主機名解析的功能）。InetAddress類提供了將主機名解析爲IP地址（或反之）的方法。其生成InetAddress對象的方法

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class Main {
    public static void main(String[] args) throws UnknownHostException {
        //Inet4Address address= (Inet4Address) Inet4Address.getLocalHost();
        InetAddress address = InetAddress.getLocalHost();
        System.out.println(address);//獲取計算機名稱和ip地址
        String hostAddress = address.getHostAddress();
        System.out.println(hostAddress);//獲取ip地址
        String hostName = address.getHostName();
        System.out.println(hostName);//獲取計算機名稱
    }
}

 2.封裝方法

    public static String getLocalIp() {
        Enumeration<NetworkInterface> netInterfaces = null;
        try {
            netInterfaces = NetworkInterface.getNetworkInterfaces();
            while (netInterfaces.hasMoreElements()) {
                NetworkInterface nif = netInterfaces.nextElement();
                Enumeration<InetAddress> InetAddress = nif.getInetAddresses();
                while (InetAddress.hasMoreElements()) {
                    String ip = InetAddress.nextElement().getHostAddress();
                    if (ip.startsWith("192.168")) {
                        return ip;
                    }
                }
            }
        } catch (SocketException e) {
        }
        return "127.0.0.1";
    }