HttpURLConnection: getContentLength()
import java.net.HttpURLConnection; import java.net.URL; import java.util.Date; public class Main{ public static void main(String args[]) throws Exception { URL url = new URL("http://www.google.com"); HttpURLConnection httpCon = (HttpURLConnection) url.openConnection(); int len = httpCon.getContentLength(); if (len == -1) System.out.println("Content length unavailable."); else System.out.println("Content-Length: " + len); } }