获取本机ip地址

    public static String getLocalIpAddr() {

        String clientIP = null;
        Enumeration<NetworkInterface> networks = null;
        try {
            //获取所有网卡设备
            networks = NetworkInterface.getNetworkInterfaces();
            if (networks == null) {
                //没有网卡设备 打印日志  返回null结束
                return null;
            }
        } catch (SocketException e) {
            System.out.println(e.getMessage());
        }
        InetAddress ip;
        Enumeration<InetAddress> addrs;
        // 遍历网卡设备
        while (networks.hasMoreElements()) {
            NetworkInterface ni = networks.nextElement();
            try {
                //过滤掉 loopback设备、虚拟网卡
                if (!ni.isUp() || ni.isLoopback() || ni.isVirtual()) {
                    continue;
                }
            } catch (SocketException e) {
            }
            addrs = ni.getInetAddresses();
            if (addrs == null) {
                continue;
            }
            // 遍历InetAddress信息
            while (addrs.hasMoreElements()) {
                ip = addrs.nextElement();
                if (!ip.isLoopbackAddress() && ip.isSiteLocalAddress() && ip.getHostAddress().indexOf(":") == -1) {
                    try {
                        clientIP = ip.toString().split("/")[1];
                    } catch (ArrayIndexOutOfBoundsException e) {
                        clientIP = null;
                    }
                }
            }
        }
        return clientIP;
    }