Java Utililty Methods IP Address Get

if (intranetIp == null) {
    try {
        intranetIp = InetAddress.getLocalHost().getHostAddress();
    } catch (Exception e) {
        intranetIp = "127.0.0.1";
return intranetIp;
...

if (_ip != null) {
    return _ip;
Enumeration<NetworkInterface> nis = NetworkInterface.getNetworkInterfaces();
NetworkInterface ni;
while (nis.hasMoreElements()) {
    ni = nis.nextElement();
    if (!ni.isLoopback() && ni.isUp()) {
...

if (null != cachedIpAddress) {
    return cachedIpAddress;
Enumeration<NetworkInterface> netInterfaces;
try {
    netInterfaces = NetworkInterface.getNetworkInterfaces();
} catch (final SocketException ex) {
    return "unknown ip";
...

try {
    Enumeration allNetInterfaces = NetworkInterface.getNetworkInterfaces();
    InetAddress ip = null;
    byte[] internalIP = null;
    while (allNetInterfaces.hasMoreElements()) {
        NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
        Enumeration addresses = netInterface.getInetAddresses();
        while (addresses.hasMoreElements()) {
...

try {
    List<String> ips = new ArrayList<String>();
    Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
    while (interfaces.hasMoreElements()) {
        NetworkInterface current = interfaces.nextElement();
        if (current.isUp() && !current.isLoopback() && !current.isVirtual()) {
            Enumeration<InetAddress> addresses = current.getInetAddresses();
            while (addresses.hasMoreElements()) {
...

String ip = null;
try {
    Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
    while (interfaces.hasMoreElements()) {
        NetworkInterface iface = interfaces.nextElement();
        if (iface.isLoopback() || !iface.isUp())
            continue;
        Enumeration<InetAddress> addresses = iface.getInetAddresses();
...

URL whatismyip = new URL("http://checkip.amazonaws.com");
BufferedReader in = null;
try {
    in = new BufferedReader(new InputStreamReader(whatismyip.openStream()));
    String ip = in.readLine();
    return ip;
} finally {
    if (in != null) {
...

if (ipAddress == null) {
    try {
        URL whatismyip = new URL("http://checkip.amazonaws.com");
        try (BufferedReader in = new BufferedReader(new InputStreamReader(whatismyip.openStream()))) {
            ipAddress = in.readLine();
    } catch (Throwable e) {
        System.err.println("Unable to retrieve this machine's external ip: " + e.getMessage());
...

InetAddress ip;
try {
    ip = InetAddress.getLocalHost();
    return ip.getHostAddress();
} catch (UnknownHostException e) {
    e.printStackTrace();
return "localhost";
...

String ip = "";
try {
    Enumeration<?> e1 = (Enumeration<?>) NetworkInterface.getNetworkInterfaces();
    while (e1.hasMoreElements()) {
        NetworkInterface ni = (NetworkInterface) e1.nextElement();
        if (!ni.getName().equals("eth0")) {
            continue;
        } else {
...