Java Glossary : URLConnection

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URLConnection

A java.net.URL is just the name of a resource, usually a file on a remote website, but it can be a local file, a file in a jar or many other things. java.net.URLs don't establish any sort of electrical connection to the resource. That is the job of java.net.URLConnection.

You create the URLConnection, then set modifiers such as setUseCaches( false ), then call connect, the start reading or writing using methods to read header such as getContentType or getContent to read the body of the message.

connect is a bit confusing, since it will get called for you automatically if you leave it out, and you can't set any modifiers once it has been called, whether you called it, or it was called automaticaly. It forgiving. If you call it and you are already connected, it is just ignored.

For examples of use, see the FileIO Amanuensis.

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