Java 獲取 URL響應頭的日期信息

我們用 HttpURLConnection 的 httpCon.getDate() 方法來獲取 URL響應頭的日期信息

代碼如下

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("無法獲取信息。");
      else
      System.out.println("Date: " + new Date(date));
   }
}

結果輸出

Date: Mon May 06 18:02:35 CST 2019