Java IP Address Get getPublicIP()

Description

get Public IP

License

Open Source License

Declaration

public static final String getPublicIP() 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

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

import java.io.InputStreamReader;

import java.net.MalformedURLException;

import java.net.URL;

public class Main {
    private final static java.util.regex.Pattern pattern = java.util.regex.Pattern
            .compile("^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." + "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
                    + "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." + "([01]?\\d\\d?|2[0-4]\\d|25[0-5])$");

    public static final String getPublicIP() {
        URL url = null;/*from  w ww . ja va2 s.  c  om*/
        final String[] websites = new String[] { "http://checkip.amazonaws.com", "http://myexternalip.com/raw",
                "https://wtfismyip.com/text", "https://api.ipify.org/" };

        for (String website : websites) {
            try {
                url = new URL(website);
            } catch (MalformedURLException e) {
                continue;
            }

            try (BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()))) {
                String line = in.readLine();
                if (isIPValid(line))
                    return line;
            } catch (IOException e) {
                continue;
            }
        }
        return null;
    }

    public static boolean isIPValid(final String ipv4) {
        java.util.regex.Matcher matcher = pattern.matcher(ipv4);
        return matcher.matches();
    }
}

Related

1. getPublicIP()
2. getPublicIP()
3. getPublicIP()
4. getPublicIP()
5. getPublicIP()
6. getPublicIP2()
7. getPublicIPAddress()
8. getPublicIps()
9. getPublicIpViaHttp()