java怎么获取外网ip

curl ifconfig.me

import java.net.InetAddress;

public class GetPublicIpAddress {

    public static void main(String[] args) throws Exception {
        InetAddress ip = InetAddress.getByName("google.com");
        String publicIpAddress = ip.getHostAddress();
        System.out.println("Public IP address: " + publicIpAddress);
    }
}

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class GetPublicIpAddress {

    public static void main(String[] args) throws Exception {
        String url = "https://api.ipify.org";
        URL urlObject = new URL(url);
        HttpURLConnection connection = (HttpURLConnection) urlObject.openConnection();
        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String publicIpAddress = in.readLine();
        System.out.println("Public IP address: " + publicIpAddress);
    }
}