Java如何获取URL连接的日期？

Java编程中，如何获取URL连接的日期？

以下示例演示如何使用HttpURLConnection类的httpCon.getDate()方法获取URL连接的日期。

package com.yiibai;

import java.net.HttpURLConnection;

import java.net.URL;

import java.text.SimpleDateFormat;

import java.util.Date;

public class URLConnectionDate {

    public static void main(String args[]) throws Exception {

        URL url = new URL("http://www.yiibai.com");

        HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();

        long date = httpCon.getDate();

        if (date == 0) {

            System.out.println("No date information.");

        } else {

            SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd hh:mm:ss ");

            System.out.println("It is now : " + formatter.format(new Date(date)));

        }

    }

}

Java

上述代码示例将产生以下结果 -

It is now : 2017/09/20 21:33:26