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AJAXJS aims to full-stack, not only the server-side framework, but also integrates the front-end library. It's written in HTML5 + Java, a successor to the JVM platform, efficient, secure, stable, cross-platform and many other advantages, but it abandoned the traditional enterprise architecture brought about by the large and bloated, emphasizing the lightweight, and fast, very suitable for the Internet fast application.

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package com.ajaxjs.net.http;

import java.io.IOException;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.NetworkInterface;
import java.net.Socket;
import java.util.Enumeration;
import java.util.Map;

import com.ajaxjs.util.MapTool;

public class Tools {
	static String ip;

	/**
	 * 获取本机 ip，带缓存的
	 * 
	 * @return
	 */
	public static String getIp() {
		if (ip == null)
			ip = getLocalHostLANAddress().getHostAddress();

		return ip;
	}

	public static InetAddress getLocalHostLANAddress() {
		InetAddress candidateAddress = null;

		try {
			// 遍历所有的网络接口
			for (Enumeration ifaces = NetworkInterface.getNetworkInterfaces(); ifaces.hasMoreElements();) {
				NetworkInterface iface = (NetworkInterface) ifaces.nextElement();

				// 在所有的接口下再遍历 IP
				for (Enumeration inetAddrs = iface.getInetAddresses(); inetAddrs.hasMoreElements();) {
					InetAddress inetAddr = (InetAddress) inetAddrs.nextElement();

					if (!inetAddr.isLoopbackAddress()) {// 排除 loopback 类型地址
						if (inetAddr.isSiteLocalAddress())
							return inetAddr;// 如果是 site-local 地址，就是它了
						else if (candidateAddress == null)
							candidateAddress = inetAddr;// site-local 类型的地址未被发现，先记录候选地址
					}
				}
			}

			if (candidateAddress != null)
				candidateAddress = InetAddress.getLocalHost();// 如果没有发现 non-loopback 地址.只能用最次选的方案
		} catch (Exception e) {
			System.err.println(e);
		}

		return candidateAddress;
	}

	/**
	 * 如果放在不能连接公网的环境，这个方法就不适用了
	 * 
	 * @return
	 */
	public static String getLocalIp() {
		try (Socket socket = new Socket();) {
			socket.connect(new InetSocketAddress("baidu.com", 80));
			return socket.getLocalAddress().getHostAddress();
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	public static String getLocalIp2() {
		try (DatagramSocket socket = new DatagramSocket()) {
			socket.connect(InetAddress.getByName("114.114.114.114"), 10002);
			return socket.getLocalAddress().getHostAddress();
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	/**
	 * 域名是否已经注册
	 * 
	 * @param domain 域名
	 * @return true=可以注册
	 * @throws IOException
	 */
	public static boolean isDomianRegisterAvailable(String domain) throws IOException {
		String url = "http://panda.www.net.cn/cgi-bin/check.cgi?area_domain=" + domain;
		String xml = NetUtil.simpleGET(url);
		Map map = MapTool.xmlToMap(xml);

		if ("200".equals(map.get("returncode"))) {
			if (map.get("original").startsWith("210")) {
				return true; // original=210 : Domain name is available 表示域名可以注册
			} else if (map.get("original").startsWith("211")) {
				return false;// original=211 : Domain name is not available 表示域名已经注册
			} else if (map.get("original").startsWith("212")) {
				throw new IOException("域名参数传输错误");
			} else {
				throw new IOException("未知错误！ " + map);
			}
		} else {
			throw new IOException("接口返回不成功 " + map);
		}
	}

	/**
	 * 域名 whois 查询 https://www.nowapi.com/api/domain.whois
	 * 
	 * @param domain 域名
	 * @return 域名详情
	 * @throws IOException
	 */
	public static Map getWhois(String domain) throws IOException {
		String url = "http://api.k780.com/?app=domain.whois&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=xml&domain=" + domain;
		String xml = NetUtil.simpleGET(url);
		Map map = MapTool.xmlToMap(xml);

		if ("1".equals(map.get("success"))) {
			return map;
		} else {
			throw new IOException("接口返回不成功 " + map);
		}
	}
}