java如何查询本机外网IP

版权声明：转载请标明出处 https://blog.csdn.net/Joe_Wang1/article/details/82379273

package com.example.springboot.shiro.common.utils.ip;

/**
 * Created by joe强 on 2018/8/29 17:00
 */

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

import java.net.URL;
import java.net.URLConnection;

import org.jsoup.Connection;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Element;


/**
 * Created by joe强 on 2018/8/29 15:07
 */
public class IpUtil {
    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 = IpUtil.getWebIp();
    System.out.println(ip);
    String str ="***";
    StringBuilder sb = new StringBuilder(ip);
     sb.replace(12,15,str);
    System.out.println(sb.toString());

}

}