java获取公网ip以及物理地址和代理商

package ipconfig;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class gainInformation {
    public static void main(String args[]) {
        String publicip = getip.publicip();
        int ipindex1 = publicip.indexOf("[");
        int ipindex2 = publicip.indexOf("]");
        String ip = publicip.substring(ipindex1+1, ipindex2);
        System.out.println(ip);
        int address1 = publicip.indexOf("来自：");
        int address2 = publicip.indexOf("</center>");
        String substring = publicip.substring(address1+3,address2);
        String[] split = substring.split(" ");
        for (int i = 0; i < split.length; i++) {
            System.out.println(split[i]);
        }
    }
}
    class getip{
    public static String publicip() {
        BufferedReader br = null;
        try {
            URL url = new URL("http://20019.ip138.com/ic.asp");
            URLConnection urlconn = url.openConnection();
            br = new BufferedReader(new InputStreamReader(urlconn.getInputStream()));
            String buf,get = null;
            while ((buf = br.readLine()) != null) {
                get+=buf;
            }
            return get;
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                br.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}