获取本机的内外网ip

package tool;

import java.net.InetAddress;import java.net.UnknownHostException;

/** * @description * @author: 123.com * @create: 2019-01-17 17:34:52 **/

public class GetIp {    public static void getip() {        try {            InetAddress address = InetAddress.getLocalHost();//获取的是本地的IP地址 //PC-20140317PXKX/192.168.0.121            String hostAddress = address.getHostAddress();//192.168.0.121            InetAddress address1 = InetAddress.getByName("www.wodexiangce.cn");//获取的是该网站的ip地址，比如我们所有的请求都通过nginx的，所以这里获取到的其实是nginx服务器的IP地            String hostAddress1 = address1.getHostAddress();//124.237.121.122            InetAddress[] addresses = InetAddress.getAllByName("www.baidu.com");//根据主机名返回其可能的所有InetAddress对象            for(InetAddress addr:addresses){                System.out.println(addr);//www.baidu.com/14.215.177.38                //www.baidu.com/14.215.177.37            }        } catch (Exception e){            e.printStackTrace();        }    }

public static void main(String[] args) {        String serverIp = getServerIp();        System.out.println(serverIp);    }

/**     * 获取服务器IP地址     * @return     */    @SuppressWarnings("unchecked")    public static String  getServerIp(){        InetAddress addr = null;        try {            addr = InetAddress.getLocalHost();        } catch (UnknownHostException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }

byte[] ipAddr = addr.getAddress();        String ipAddrStr = "";        for (int i = 0; i < ipAddr.length; i++) {            if (i > 0) {                ipAddrStr += ".";            }            ipAddrStr += ipAddr[i] & 0xFF;        }        //System.out.println(ipAddrStr);        return "局域网："+ipAddrStr;    }}/***************************************************分割线******************************************************/

package tool;

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;

import java.net.URL;

public class Getip2 {    public static String getWebIp() {        try {

//如果请求超时 ,请查看查询本机IP网站 是否更换            URL url = new URL("http://2018.ip138.com/ic.asp");

BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()));

String s = "";

StringBuffer sb = new StringBuffer("");

String webContent = "";

while ((s = br.readLine()) != null) {                sb.append(s + "\r\n");

}

br.close();            webContent = sb.toString();            int start = webContent.indexOf("[")+1;            int end = webContent.indexOf("]");            webContent = webContent.substring(start,end);            return webContent;

} catch (Exception e) {            System.err.println("获取IP发生错误");            e.printStackTrace();            return "error";

}

}

public static void  main(String [] args) throws IOException {        String ip = Getip2.getWebIp();//        System.out.println(ip);        String str ="";        StringBuilder sb = new StringBuilder(ip);        sb.replace(12,15,str);        System.out.println("所属外网:" + sb.toString());

String serverIp = GetIp.getServerIp();        System.out.println(serverIp);    }

}

原文地址：https://www.cnblogs.com/tk112/p/10283647.html