Java Network Programming, Second Edition

The URLName Class

javax.mail.URLName represents the name of a URL; that is, it treats a URL as a string, but does not attempt to connect to or resolve any of the parts of the string. URL names are mainly used as convenient ways to identify folders and stores with nonstandard URLs, such as pop3://elharo:[e-mail]:110/INBOX, that don’t have a matching protocol handler:

public class URLName Object

The methods of URLName are very similar to those of java.net.URL discussed in Chapter 7, except that all those involving actual connections have been deleted. What’s left is a bunch of methods for breaking a URL string into its component parts or building a URL from pieces.

The Constructors

There are three overloaded URLName constructors. One takes the individual pieces of a URL as arguments; another takes a java.net.URL object; and a third takes a String containing a URL:

public URLName(String protocol, String host, int port, String file, 
 String userName, String password)
public URLName(URL url)
public URLName(String url)

Constructing a URLName does not require that a protocol handler for the scheme be available. All the operations on the URLName take place with simple substring manipulation. This allows the URLName class to support very nonstandard URLs like pop3://eharold:[e-mail]/INBOX or imap://[e-mail]/Speaking/SD99West. These URLName objects can be used to refer to particular folders on the server.

Parsing Methods

These seven getter ...