Wow – two techie posts in one day! Sorry, non-techie family & friends!

At work, I needed a way to get Javascript array data in and out of my Tomcat Sessions. Given the fragmented state of web development, I was not really too surprised to discover that this extremely common problem does not yet have a simple/common solution.

After a bit of searching, I found this library, which looks pretty cool, but it was way more than I needed. I don’t need full blown RPC, I just need to pass data in and out of my Java Sessions.

So I ended up rolling my own solution: a Struts action (which could just as easily be a Servlet) that takes key/value data from the request and writes it into a named Collection in the Session (if a PUT/POST request method is used), or returns said Collection as a JSONArray. It deletes values as well if you pass “action=delete” in the request params. Returns a 404 if you ask for a Collection it doesn’t know about. Very seemple, very eeessy. If you’re interested in the source, shoot me an email – my boss probably won’t mind!

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What about you PHP guys – is there something even slicker in PHP for doing this?

Incidentally, I finally, totally grokked the true raison d’etre for JSON today: it’s the easiest way to pass simple data structures from a Javascript context to and from a server-side environment. Because JSON *is* Javascript, you can just eval() a JSON string to create a Javascript Array. Pretty nifty!