Java 提取并解析 URL 响应头的时间字段

    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.baidu.com");
      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));
       }
    }