HttpURLConnection从服务器获取内容长度

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpURLConnectionExample {
    public static void main(String[] args) {
        try {
            URL url = new URL("http://www.example.com");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();

            int responseCode = connection.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                int contentLength = connection.getContentLength();
                System.out.println("Content Length: " + contentLength);
            } else {
                System.out.println("Connection failed. Response Code: " + responseCode);
            }

            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}