java代码如何获取一个URL响应头的日期呢?

实现思路:
    1.实例化一个HttpURLConnection对象
	2.使用httpURLConnection对象的getDate()方法即可获取响应头日期

/**
 * java265.com 获取URL响应头的日期信息
 * 
 * @throws IOException
 */
public static void main(String[] args) throws IOException {

	URL url = new URL("http://www.java265.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));
 }