Back to project page AndroidLookup.
The source code is released under:
GNU General Public License
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/** * //from ww w . j a v a 2 s . c o m */ package com.jburto2.androidlookup; import java.net.InetAddress; import java.net.UnknownHostException; import java.util.StringTokenizer; /** * @author James Burton * * @class LookupAddressTask * @brief This class is an LookupTask that looks up all IP addresses for a if given a hostname. * */ public class LookupAddressTask extends LookupTask { /** * @fn protected String doInBackground(String... urls) * * @brief This function uses java.net.InetAddress to lookup all the ipAddresses for a given host. * * * * @param urls Array of strings that are arguments to the function. url[0] is the address to lookup. * @return String that represents all the IP addresses for the host with ';' delimiter. * @return null If the call failed. * @exception Exception generated from InetAddress call is stored in the public instance variable exception. * */ protected String doInBackground(String... urls) { String url = urls[0]; try { ///Found NSLookup from http://www.coderanch.com/t/328875/java/java/nslookup-Java ///More on inet addresses from http://download.java.net/jdk7/archive/b123/docs/api/java/net/InetAddress.html InetAddress ipAddresses[] = InetAddress.getAllByName(url); StringBuffer strbuf = new StringBuffer(""); for(int i = 0; i < ipAddresses.length; i++ ) { strbuf.append(ipAddresses[i].getHostAddress()+";"); } return strbuf.toString(); } catch(UnknownHostException e) { this.exception = e; return null; } } /** * @fn protected void onPostExecute(String str) * * @brief Method to be done after the task has executed. * @param str Some string */ protected void onPostExecute(String str) { // TODO: check this.exception // TODO: do something with the feed } /** * @fn public static boolean isIP(String input) * @brief Determine whether an address is an IPv4 address. * * @param input Address to check * @return true if an IP address. * @return false if not an IP address. */ protected static boolean isIP(String input) throws UnknownHostException { //break up the address into tokens StringTokenizer strtok = new StringTokenizer(input,"."); while (strtok.hasMoreTokens()) { // try to convert the value to a number. int value = 0; try { value = Integer.parseInt(strtok.nextToken()); if (value < 0 && value > 255) { // if the number is < 0 or > 255, not an IP address. return false; } } catch (NumberFormatException nfe) { // not a number. Return false. return false; } } // if all tokens are valid numbers, then this is an IP address. return true; } }