Java 工具类 IpUtil

Java 工具类 IpUtil - 获取本机所有 IP 地址，LocalHost 对应地址 IP

IP 工具类

源代码：

/**
 * <p>
 *
 * @author XiaoPengwei
 * @since 2019-07-20
 */
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;


public class IpUtil {

    public static void main(String[] args) {

        IpUtil testGetIP = new IpUtil();

        System.out.println("Your LocalHost IP(ipv4) is:");

        System.out.println(testGetIP.getIP());

        System.out.println("
Here are all your IPS:");
        testGetIP.printAllIp();
    }

    /**
     * Fond LocalHost ipv4
     *
     * @return java.lang.String
     */
    public String getIP() {
        try {
            // 根据 hostname 找 ip
            InetAddress address = InetAddress.getLocalHost();
            if (address.isLoopbackAddress()) {
                Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
                while (allNetInterfaces.hasMoreElements()) {
                    NetworkInterface netInterface = allNetInterfaces.nextElement();
                    Enumeration<InetAddress> addresses = netInterface.getInetAddresses();
                    while (addresses.hasMoreElements()) {
                        InetAddress ip = addresses.nextElement();
                        if (!ip.isLinkLocalAddress() && !ip.isLoopbackAddress() && ip instanceof Inet4Address) {
                            return ip.getHostAddress();
                        }
                    }
                }
            }
            return address.getHostAddress();
        } catch (UnknownHostException | SocketException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * Find all network interfaces
     */
    public void printAllIp() {
        try {
            Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
            while (allNetInterfaces.hasMoreElements()) {
                NetworkInterface netInterface = allNetInterfaces.nextElement();

                // Remove loopback interface, sub-interface, unrun and interface
                if (netInterface.isLoopback() || netInterface.isVirtual() || !netInterface.isUp()) {
                    continue;
                }

                Enumeration<InetAddress> addresses = netInterface.getInetAddresses();
                while (addresses.hasMoreElements()) {
                    InetAddress ip = addresses.nextElement();
                    if (ip != null) {

                        System.out.println("ip = " + ip.getHostAddress());
                        // ipv4
                        if (ip instanceof Inet4Address) {
                            System.out.println("ipv4 = " + ip.getHostAddress());

                            if (!ip.getHostAddress().startsWith("192") && !ip.getHostAddress().startsWith("10") && !ip.getHostAddress().startsWith("172")) {
                                // Intranet
                                ip.getHostAddress();
                            }
                        }
                    }
                }
            }
        } catch (SocketException e) {
            System.err.println("[Error] can't get host ip address" + e.getMessage());
        }
    }
}