これは、Web サービスを使用して IP アドレスを取得しています。
package ipInfo;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
public class ExternalIp {
private static String URL = "http://api-sth01.exip.org/?call=ip";
public static void main(String[] args) {
ExternalIp ipGetter = new ExternalIp();
ipGetter.getExternalIp();
}
public void getExternalIp()
{
BufferedReader reader = null;
String line = "";
int tries = 0;
do {
try {
reader = read(URL);
/*while(reader.readLine() != null)
{
line = line + reader.readLine();
}*/
line = reader.readLine();
}
catch (FileNotFoundException fne) {
System.out.println("File not found for url: " + URL);
System.out.println("Check your typing");
System.out.println();
return;
}
catch (IOException ioe) {
System.out.println("Got IO Exception, tries = " + (tries + 1));
System.out.println("Message: " + ioe.getMessage());
tries++;
try {
Thread.currentThread().sleep(300000);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
continue;
}
catch (Exception exc) {
exc.printStackTrace();
}
} while (reader == null && tries < 5);
if (line != null && line.length() > 0) {
System.out.println("Your external ip address is: " + line);
}
else {
System.out.println("Sorry, couldn't get your ip address");
}
}
public BufferedReader read(String url) throws Exception{
return new BufferedReader(
new InputStreamReader(
new URL(url).openStream()));
}
}