从SocketAddress获取IP

//package com.nowjava;/**来自 时代Java - nowjava.com**/

import java.net.SocketAddress;


public class Main {

    public static String getIP(SocketAddress socketAddress) {

        if (socketAddress == null) {

            throw new NullPointerException("remoteAddres is null");

        }

        String address = socketAddress.toString();

        return address.substring(1, address.indexOf(':'));

    }

}