JAVA应用获取本机IP

在应用开发的时候如何获取本机的IP呢？

本人在开发一个线上系统的时候有这样的需求，办法很简单啊，google一下，于是乎有了下面的代码：

方案一：

Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
            if (interfaces != null) {
                while (interfaces.hasMoreElements()) {
                    try {
                        NetworkInterface network = interfaces.nextElement();
                        if ("eth0".equals(network.getName())) { // 验证只有eth0才会获取ip
                            Enumeration<InetAddress> addresses = network.getInetAddresses();
                            if (addresses != null) {
                                while (addresses.hasMoreElements()) {
                                    try {
                                        InetAddress address = addresses.nextElement();
                                        if (isValidAddress(address)) {
                                            return address;
                                        }
                                    } catch (Throwable e) {
                                        if (LOGGER.isWarnEnabled()) {
                                            LOGGER.warn("[getLocalAddress0] Failed to retriving ip address, " + e.getMessage(), e);
                                        }
                                    }
                                }
                            }
                        }
                    } catch (Throwable e) {
                        if (LOGGER.isWarnEnabled()) {
                            LOGGER.warn("[getLocalAddress0] Failed to retriving ip address, " + e.getMessage(), e);
                        }
                    }
                }
            }

这段代码中为什么加入判断eth0呢？因为一般线上服务器可能不止有一个网卡，我们线上内网都是用的eth0，所以就可以写死。但是这样毕竟不好。那怎么解决呢？

方案二：

已知线上某台服务器ip，并可以连上。通过socket链接，获取本机对内网ip

private static InetAddress getLocalHostBySocket(InetSocketAddress remoteAddress) {
    InetAddress host = null;
    try {
        // 连远程地址
        Socket socket = new Socket();
        try {
            socket.connect(remoteAddress, 1000);
            // 得到本地地址
            host = socket.getLocalAddress();
        } finally {
            try {
                socket.close();
            } catch (Throwable e) {
            }
        }
    } catch (Exception e) {
        logger.warn("Can not connect to host {}, cause by :{}",
                remoteAddress.toString(), e.getMessage());
    }
    return host;}