How do I decompose a URL into its component parts in Java?

Question

My requirements are fairly simple, but I need to do a lot of this so I'm looking for a robust solution.

Is there a good light-weight library for decomposing URLs into their component parts in Java? I'm referring to hostname, query string, etc.

Answer 1

I am always forgetting the URI format, so here it is:

<scheme>://<userinfo>@<host>:<port><path>#<fragement>

And here an example:

URI uri = new URI ("query://[email protected]:9000/public/manuals/appliances?stove#ge");

The following will happen:

• uri.getAuthority() will return "[email protected]:9000"
• uri.getFragment () will return "ge"
• uri.getHost () will return "books.com"
• uri.getPath () will return "/public/manuals/appliances"
• uri.getPort () will return 9000
• uri.getQuery () will return "stove"
• uri.getScheme () will return "query"
• uri.getSchemeSpecificPart () will return "//[email protected]:9000/public/manuals/appliances?stove"
• uri.getUserInfo () will return "jeff"
• uri.isAbsolute () will return true
• uri.isOpaque () will return false

I found this blog handy: Exploring Java's Network API: URIs and URLs