Java の例 - URL 応答ヘッダーから日付情報を取得する

/*
 author by w3cschool.cc
 Main.java
 */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.w3cschool.cc");
      HttpURLConnection httpCon = 
      (HttpURLConnection) url.openConnection();
      long date = httpCon.getDate();
      if (date == 0)
      System.out.println("无法获取信息。");
      else
      System.out.println("Date: " + new Date(date));
   }}