系统获取 IP 工具类

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);
    }
}