java入门---网络实例操作之获取 URL响应头的日期信息

    以下实例演示了如何使用 HttpURLConnection 的 httpCon.getDate() 方法来获取 URL响应头的日期信息：

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.example.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));
   }
}