如何在java中查询我的外部IP地址

Question

我有一台路由器，当我使用以下命令询问我的IP地址时: InetAddress.getLocalHost().getHostAddress()；然后我得到了我的内部IP地址。当我进入网络上的www.whatismyip.com页面时，我得到了另一个IP地址，那就是我的真实地址。

我如何在Java中询问这个真实的IP地址？

谢谢..。

Answer 1

    public class IP {

  public String myOuterIP() {
    return(readIP("http://checkip.amazonaws.com"));
  }

  public String readIP(String url) {
    String ip = "";
    try {
      URL whatIsMyIP = new URL(url);
      InputStreamReader ir =new InputStreamReader(whatIsMyIP.openStream());
      BufferedReader in = new BufferedReader(ir);
      ip = in.readLine();
    } catch (UnknownHostException e) {
      System.out.println("UnknownHostException");
    } catch (MalformedURLException e) {
      System.out.println("MalformedURLException");
    } catch (IOException e) {
      System.out.println("IOException");
    }
    return ip;
  }
}

这就是我的结果和它的作用。网上有一个地址：http://checkip.amazonaws.com这是我的结果。

Answer 2

也许就像这样？

import org.apache.commons.io.IOUtils;
import java.io.BufferedInputStream;
import java.net.HttpURLConnection;
import java.net.URL;


URL url = new URL("http://myexternalip.com/raw");

HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

InputStream in = new BufferedInputStream(urlConnection.getInputStream());

String externalIP = IOUtils.toString(in, "UTF-8");