Java獲取本地IP地址和主機名

方式一：通過java.net.InetAddress類獲取

public void test1() {
    try {
        InetAddress addr = InetAddress.getLocalHost();
        System.out.println("IP地址：" + addr.getHostAddress() + "，主機名：" + addr.getHostName());
    } catch (UnknownHostException e) {
        e.printStackTrace();
    }
}

輸出：

IP地址：192.168.153.1，主機名：DESKTOP-338UP3E

這種方式獲取到的主機名沒啥問題，這種方式獲取的主機名沒啥問題，但獲取到的IP地址卻有待考量，如果一台機器有多個網卡，他獲取的IP是誰的呢？事實上，上面輸出的IP是我虛擬機IP地址，既不是我有線網卡的地址，也不是我無線網卡的地址。

 

方式二：利用java.net.NetworkInterface獲取

public void test2() {
    try {
        Enumeration<NetworkInterface> faces = NetworkInterface.getNetworkInterfaces();
        while (faces.hasMoreElements()) { // 遍歷網絡接口
            NetworkInterface face = faces.nextElement();
            if (face.isLoopback() || face.isVirtual() || !face.isUp()) {
                continue;
            }
            System.out.print("網絡接口名：" + face.getDisplayName() + "，地址：");
            Enumeration<InetAddress> address = face.getInetAddresses();
            while (address.hasMoreElements()) { // 遍歷網絡地址
                InetAddress addr = address.nextElement();
                if (!addr.isLoopbackAddress() && addr.isSiteLocalAddress() && !addr.isAnyLocalAddress()) {
                    System.out.print(addr.getHostAddress() + " ");
                }
            }
            System.out.println("");
        }
    } catch (SocketException e) {
        e.printStackTrace();
    }
}

輸出：

網絡接口名：VMware Virtual Ethernet Adapter for VMnet8，地址：192.168.153.1 
網絡接口名：TAP-Windows Adapter V9，地址：10.8.0.30 
網絡接口名：VMware Virtual Ethernet Adapter for VMnet1，地址：192.168.46.1 
網絡接口名：Intel(R) Dual Band Wireless-AC 8265，地址：172.16.78.27 

疑問？：第一、三行為VM虛擬機網絡地址，不知為何還在。

 

工具類：

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

/**
 * 本地主機工具類
 * 
 * @author zhi
 * @since 2019年11月13日09:04:36
 *
 */
public class LocalHostUtil {

    /**
     * 獲取主機名稱
     * 
     * @return
     * @throws UnknownHostException
     */
    public static String getHostName() throws UnknownHostException {
        return InetAddress.getLocalHost().getHostName();
    }

    /**
     * 獲取系統首選IP
     * 
     * @return
     * @throws UnknownHostException
     */
    public static String getLocalIP() throws UnknownHostException {
        return InetAddress.getLocalHost().getHostAddress();
    }

    /**
     * 獲取所有網卡IP，排除回文地址、虛擬地址
     * 
     * @return
     * @throws SocketException
     */
    public static String[] getLocalIPs() throws SocketException {
        List<String> list = new ArrayList<>();
        Enumeration<NetworkInterface> enumeration = NetworkInterface.getNetworkInterfaces();
        while (enumeration.hasMoreElements()) {
            NetworkInterface intf = enumeration.nextElement();
            if (intf.isLoopback() || intf.isVirtual()) { //
                continue;
            }
            Enumeration<InetAddress> inets = intf.getInetAddresses();
            while (inets.hasMoreElements()) {
                InetAddress addr = inets.nextElement();
                if (addr.isLoopbackAddress() || !addr.isSiteLocalAddress() || addr.isAnyLocalAddress()) {
                    continue;
                }
                list.add(addr.getHostAddress());
            }
        }
        return list.toArray(new String[0]);
    }

    /**
     * 判斷操作系統是否是Windows
     * 
     * @return
     */
    public static boolean isWindowsOS() {
        boolean isWindowsOS = false;
        String osName = System.getProperty("os.name");
        if (osName.toLowerCase().indexOf("windows") > -1) {
            isWindowsOS = true;
        }
        return isWindowsOS;
    }

    public static void main(String[] args) {
        try {
            System.out.println("主機是否為Windows系統：" + LocalHostUtil.isWindowsOS());
            System.out.println("主機名稱：" + LocalHostUtil.getHostName());
            System.out.println("系統首選IP：" + LocalHostUtil.getLocalIP());
            System.out.println("系統所有IP：" + String.join(",", LocalHostUtil.getLocalIPs()));
        } catch (UnknownHostException e) {
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}