[网络协议]Get ip address

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <iostream>
#include <ifaddrs.h>
#include <string.h>

using namespace std;

int main()
{
    struct ifaddrs * ifAddrStruct=NULL;
    struct ifaddrs * ifa=NULL;
    void * tmpAddrPtr=NULL;

    getifaddrs(&ifAddrStruct);

    for (ifa = ifAddrStruct; ifa != NULL; ifa = ifa->ifa_next) {
        if (!ifa->ifa_addr) {
            continue;
        }
		
		if ((strcmp("lo", ifa->ifa_name) == 0) || !(ifa->ifa_flags & (IFF_RUNNING))) {
				continue;
		}
        if (ifa->ifa_addr->sa_family == AF_INET) { 
            tmpAddrPtr = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
            char addressBuffer[INET_ADDRSTRLEN];
            inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN);
			std::cout << std::string(addressBuffer) << std::endl;

        } else if (ifa->ifa_addr->sa_family == AF_INET6) {
            tmpAddrPtr= &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
            char addressBuffer[INET6_ADDRSTRLEN];
            inet_ntop(AF_INET6, tmpAddrPtr, addressBuffer, INET6_ADDRSTRLEN);
			std::cout << std::string(addressBuffer) << std::endl;
        } 
    }
    if (ifAddrStruct!=NULL) freeifaddrs(ifAddrStruct);

    return 0;
}

For Java:

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;

private String getAddress() {
    try {
        Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
        while (allNetInterfaces.hasMoreElements()) {
            NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
            Enumeration<InetAddress> addresses = netInterface.getInetAddresses();
            while (addresses.hasMoreElements()) {
                InetAddress ip = (InetAddress) addresses.nextElement();
                if (ip instanceof Inet4Address
                        && !ip.isLoopbackAddress()
                        && !ip.getHostAddress().contains(":")) {
                    String ipHostAddress = ip.getHostAddress();
                    return ipHostAddress;
                }
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return "";
}