如何在java中获取当前请求的IP

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.*;

/**
 * 系统信息工具类
 */
public final class IPUtil {

    private static Logger logger = LoggerFactory.getLogger(IPUtil.class);

    private IPUtil() {
    }

    /**
     * 取到当前机器的IP地址
     */
    public static String getIp() {
        String hostIp;
        List ips = new ArrayList<>();
        Enumeration netInterfaces;
        try {
            netInterfaces = NetworkInterface.getNetworkInterfaces();
            while (netInterfaces.hasMoreElements()) {
                NetworkInterface netInterface = netInterfaces.nextElement();
                Enumeration 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;
    }

    private static String collectionToDelimitedString(Collection 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) {
            logger.warn(e.getMessage(), e);
        }
        return hostName;
    }
}