Java如何获取本地IP地址和主机名呢?

获取本机IP地址和主机名的实现思路

借助 java.net.InetAddress类获取

借助 java.net.NetworkInterface获取

方式一:
   使用java.net.InetAddress类获取

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

注意事项:
    如果是虚拟IP地址，则会返回虚拟地址

方式二:
   使用java.net.NetworkInterface获取
 
public void test2() {
    try {
        Enumeration<NetworkInterface> faces = NetworkInterface.getNetworkInterfaces();
        while (faces.hasMoreElements()) { // 遍历网络接口
            NetworkInterface face = faces.nextElement();
            if (face.isLoopback() || face.isVirtual() || !face.isUp()) {
                continue;
            }
            System.out.print("网络接口名：" + face.getDisplayName() + "，地址：");
            Enumeration<InetAddress> address = face.getInetAddresses();
            while (address.hasMoreElements()) { // 遍历网络地址
                InetAddress addr = address.nextElement();
                if (!addr.isLoopbackAddress() && addr.isSiteLocalAddress() && !addr.isAnyLocalAddress()) {
                    System.out.print(addr.getHostAddress() + " ");
                }
            }
            System.out.println("");
        }
    } catch (SocketException e) {
        e.printStackTrace();
    }
} 

//此方法会输出所有网卡信息 
 

获取本机IP和主机名的工具类

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;

/**
 * 本地主机工具类 
 *
 */
public class LocalHostUtil {

    /**
     * 获取主机名称
     * 
     * @return
     * @throws UnknownHostException
     */
    public static String getHostName() throws UnknownHostException {
        return InetAddress.getLocalHost().getHostName();
    }

    /**
     * 获取系统首选IP
     * 
     * @return
     * @throws UnknownHostException
     */
    public static String getLocalIP() throws UnknownHostException {
        return InetAddress.getLocalHost().getHostAddress();
    }

    /**
     * 获取所有网卡IP，排除回文地址、虚拟地址
     * 
     * @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]);
    }

    /**
     * 判断操作系统是否是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("主机是否为Windows系统：" + LocalHostUtil.isWindowsOS());
            System.out.println("主机名称：" + LocalHostUtil.getHostName());
            System.out.println("系统首选IP：" + LocalHostUtil.getLocalIP());
            System.out.println("系统所有IP：" + String.join(",", LocalHostUtil.getLocalIPs()));
        } catch (UnknownHostException e) {
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}