Get modified date of web resource in Java

问题:

How do you get the modified date of a web resource in Java?

URL url = new URL(urlString);
URLConnection connection = url.openConnection();
connection.connect();
// What now?

回答1:

URL url = new URL(urlString);
URLConnection connection = url.openConnection();
connection.connect();
long time = connection.getLastModified();

Javadoc

Returns the value of the last-modified header field. The result is the number of milliseconds since January 1, 1970 GMT.