Java获取本地IP地址

最新推荐文章于 2025-03-17 14:53:45 发布

wenyixicodedog

最新推荐文章于 2025-03-17 14:53:45 发布

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分类专栏： JavaSE 文章标签： Java 本地IP

本文链接：https://blog.youkuaiyun.com/wenyiCodeDog/article/details/119700409

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这段代码遍历网络接口，查找第一个非环回且非私有的IPv4或IPv6地址。优先返回IPv4，若没有合适的IPv4地址则返回IPv6，如果两者都找不到，则返回localhost的地址。该方法用于确定设备在网络中的公共标识。

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public static String getLocalAddress() {
        try {
            // Traversal Network interface to get the first non-loopback and non-private address
            Enumeration<NetworkInterface> enumeration = NetworkInterface.getNetworkInterfaces();
            ArrayList<String> ipv4Result = new ArrayList<String>();
            ArrayList<String> ipv6Result = new ArrayList<String>();
            while (enumeration.hasMoreElements()) {
                final NetworkInterface networkInterface = enumeration.nextElement();
                final Enumeration<InetAddress> en = networkInterface.getInetAddresses();
                while (en.hasMoreElements()) {
                    final InetAddress address = en.nextElement();
                    if (!address.isLoopbackAddress()) {
                        if (address instanceof Inet6Address) {
                            ipv6Result.add(normalizeHostAddress(address));
                        } else {
                            ipv4Result.add(normalizeHostAddress(address));
                        }
                    }
                }
            }

            // prefer ipv4
            if (!ipv4Result.isEmpty()) {
                for (String ip : ipv4Result) {
                    if (ip.startsWith("127.0") || ip.startsWith("192.168")) {
                        continue;
                    }
                    return ip;
                }
                return ipv4Result.get(ipv4Result.size() - 1);
            } else if (!ipv6Result.isEmpty()) {
                return ipv6Result.get(0);
            }
            //If failed to find,fall back to localhost
            final InetAddress localHost = InetAddress.getLocalHost();
            return normalizeHostAddress(localHost);
        } catch (Exception e) {
            log.error("Failed to obtain local address", e);
        }
        return null;
    }