Java示例URL/HttpURLConnection获得日期getDate方法

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();
      long date = httpCon.getDate();
      if (date == 0)
         System.out.println("No date information.");
      else
         System.out.println("Date: " + new Date(date));
   }
}