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Getting link attachment

J Lalit

Joined: May 19, 2008
Posts: 15

I have a requirement that states extraction of links in body of some content.I have achieved it but stuck up in verifying whether a given HTTP link in content is a simple link to a page/site or it is an attachment?

I did enough googling but no success!!!

Any idea or link or piece of code?

Thanks & Regards,

Thanks & Regards
J Lalit.
Steve Luke

Joined: Jan 28, 2003
Posts: 4181

To get it right you pretty much need to send a request to the URL and read the CONTENT-TYPE header. You may be able to get away with sending a HEAD request to the site, which would ask the server to only respond with the headers for a particular page. You would send the request, read the CONTENT-TYPE response, and based on that determine the type of link.

More on HTTP methods (including the HEAD method)
HttpURLConnection API, Tutorial on URLConnections
Example of reading Headers with URLConnection

J Lalit

Joined: May 19, 2008
Posts: 15

Thanks for reply.How can i differentiate that a particular link is a normal HTTP link or an attachment.Does this work:

For normal Link will return "text/html".
For an attachment will return application/type where type can be MSWORD,PDF etc.

Does this formula hold true always?

Henry Wong

Joined: Sep 28, 2004
Posts: 20514

Well, it depends on what you define as a "normal link". Are HTML pages the only thing you consider as a normal link? What about regular text pages (text/plain) ? What about xml pages (text/xml)?

The list of possible content types is actually pretty big. And growing. You need to decide where to draw the line.

BTW.... did a quick google....


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
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subject: Getting link attachment
jQuery in Action, 3rd edition