Java怎么实现获取本地IP地址和主机名

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();
 }
}

public void test2() {
 try {
  Enumeration 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 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();
 }
}

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
 * 
 * @author zhi
 * @since 2019年11月13日09:04:36
 *
 */
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 list = new ArrayList<>();
  Enumeration enumeration = NetworkInterface.getNetworkInterfaces();
  while (enumeration.hasMoreElements()) {
   NetworkInterface intf = enumeration.nextElement();
   if (intf.isLoopback() || intf.isVirtual()) { //
    continue;
   }
   Enumeration 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();
  }
 }
}