系统获取 IP 工具类

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package cn.com.infosec.IDCard.radius.util;   /**  * <p>  * {此处加类的实现说明}  * </p>  *  * <p>  * 版权所有：北京信安世纪科技股份有限公司(c) 2020  * </p>  *  * @author: jlcui  * @date: 2023-06-0713:15  */   import java.net.Inet4Address; import java.net.InetAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.util.*;   /**  * 系统获取IP工具类  */ public final class IPUtil {       /**      * 取到当前机器的IP地址，这里可以直接获取该服务器的所有网卡ip，如果包括内外网网卡，就是两个ip，中间以,分隔。      */     public static String getIp() {         String hostIp = null;         List<String> ips = new ArrayList<String>();         Enumeration<NetworkInterface> netInterfaces = null;         try {             netInterfaces = NetworkInterface.getNetworkInterfaces();             while (netInterfaces.hasMoreElements()) {                 NetworkInterface netInterface = netInterfaces.nextElement();                 Enumeration<InetAddress> inteAddresses = netInterface.getInetAddresses();                 while (inteAddresses.hasMoreElements()) {                     InetAddress inetAddress = inteAddresses.nextElement();                     if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet4Address) {                         ips.add(inetAddress.getHostAddress());                     }                 }             }         } catch (SocketException ex) {             ex.printStackTrace();         }         hostIp = collectionToDelimitedString(ips, ",");         return hostIp;     }       /**      * 集合转化为连接字符串      */     private static String collectionToDelimitedString(Collection<String> coll, String delim) {         if (coll == null || coll.isEmpty()) {             return "";         }         StringBuilder sb = new StringBuilder();         Iterator<?> it = coll.iterator();         while (it.hasNext()) {             sb.append(it.next());             if (it.hasNext()) {                 sb.append(delim);             }         }         return sb.toString();     }       /**      * 获取服务器名称      */     public static String getHostName() {         String hostName = null;         try {             hostName = InetAddress.getLocalHost().getHostName();         } catch (Exception e) {             e.fillInStackTrace();         }         return hostName;     }       public static void main(String[] args) {         System.out.println(IPUtil.getIp());         System.out.println(IPUtil.getHostName());         String[] strArr = {"Google", "Baidu", "IBM", "Github", "Stackoverflow"};         List<String> list = Arrays.asList(strArr);         String result = collectionToDelimitedString(list, "、");         System.out.println(result);     } }