Java IP Address Get getExternalIP(String host, String regexPattern)

Here you can find the source of getExternalIP(String host, String regexPattern)

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Description

Finds external IP address by sending http request to host with expected response in pattern regexPattern

License

Open Source License

Parameter

Parameter Description
host remote host
regexPattern pattern of response, ip address pattern should be in group, e.g. <b>.+&lt;body&gt;Current IP Address: (\\d+.\\d+.\\d+.\\d+)&lt;/body&gt;.+</b>

Return

IP address if matched with regexPattern

Declaration 

public static String getExternalIP(String host, String regexPattern)

Method Source Code


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

import java.net.HttpURLConnection;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    /**//from w  w  w .  j  ava 2s .  c  om
     * Finds external IP address by sending http request to <b>host</b> with expected response in pattern <b>regexPattern</b>
     * @param host remote host
     * @param regexPattern pattern of response, ip address pattern should be in group, e.g. <b>.+&lt;body&gt;Current IP Address: (\\d+.\\d+.\\d+.\\d+)&lt;/body&gt;.+</b>
     * @return IP address if matched with regexPattern
     */
    public static String getExternalIP(String host, String regexPattern) {
        String resp = null;
        if (regexPattern == null)
            regexPattern = ".+<body>Current IP Address: (\\d+.\\d+.\\d+.\\d+)</body>.+";
        if (host == null)
            host = "http://checkip.dyndns.org:8245/";
        Pattern pattern = Pattern.compile(regexPattern);
        try {
            java.net.URL URL = new java.net.URL(host);
            java.net.HttpURLConnection conn = (HttpURLConnection) URL.openConnection();
            conn.setConnectTimeout(60000);
            conn.setReadTimeout(60000);
            java.io.InputStream InStream = conn.getInputStream();
            java.io.InputStreamReader Isr = new java.io.InputStreamReader(InStream);
            java.io.BufferedReader br = new java.io.BufferedReader(Isr);
            resp = br.readLine();
            if (resp != null) {
                Matcher matcher = pattern.matcher(resp);
                if (matcher.matches()) {
                    return matcher.group(1);
                }

            }
        } catch (Exception e) {
            //
        }
        return resp;
    }

    /**
     * Returns external IP address by sending HTTP request to http://checkip.dyndns.org:8425
     * @return external IP address by sending HTTP request to http://checkip.dyndns.org:8425
     */
    public static String getExternalIP() {
        return getExternalIP("http://checkip.dyndns.org:8245/",
                ".+<body>Current IP Address: (\\d+.\\d+.\\d+.\\d+)</body>.+");
    }
}

Related

  1. getAllUsableIPAddresses()
  2. getExternalIP()
  3. getExternalIp()
  4. getExternalIp()
  5. getExternalIp()
  6. getExternalIPAddress()
  7. getExternalIPAddress()
  8. getExternalIPAddress()
  9. getFirstLocalNonLoopbackIpAddress()