java 获取本机的公网、外网ip

来源：互联网发布：华为数据库开发工程师编辑：程序博客网时间：2024/05/22 06:23

本机通过路由器联网，获取ip时获取的是路由器分配的IP。

获取公网的IP:

先找一个网站，可以获得本机的外网IP,如http://www.ip138.com/

检查元素，可以获得一个地址

直接访问这个网站进行截取

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.SocketException;import java.net.URL;import java.net.URLConnection;public class Main {public static void main(String[] args) throws SocketException {for (int i = 0; i < 1000000; i++) {int a=i;new Runnable() {public void run() {System.out.println(a+"=========="+Main.getMyIP());}}.run();}}private static String getMyIP() {InputStream ins = null;try {URL url = new URL("http://1212.ip138.com/ic.asp");URLConnection con = url.openConnection();ins = con.getInputStream();InputStreamReader isReader = new InputStreamReader(ins, "GB2312");BufferedReader bReader = new BufferedReader(isReader);StringBuffer webContent = new StringBuffer();String str = null;while ((str = bReader.readLine()) != null) {webContent.append(str);}//System.out.println(webContent);int start = webContent.indexOf("[") + 1;int end = webContent.indexOf("]");return webContent.substring(start, end);} catch (Exception e) {e.printStackTrace();} finally {if (ins != null) {try {ins.close();} catch (IOException e) {e.printStackTrace();}}}return "";}  }

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