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2 Replies Last post: Aug 7, 2008 5:13 PM by Azbok  
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Azbok
3 posts since
Jul 15, 2008

Aug 6, 2008 3:35 AM

Best method of bidirectional communication java <-> web page?

I'd like to do 2 things
1) My java app has some data that I'd like to inject into my own custom webpage. Would the best way to do this be using evaluateScript() and call a javascript function in that custom webpage with JSON data? Then the webpage can update itself as necessary based on that new data.

2) My webpage has some data that I'd like the java app to have. This seems a bit trickier, but perhaps you can use the TitleChangeEvent? So for example the javascript on the webpage can set a javascript variable and then update the title. The java's TitleChangeEvent would fire, then execute evaluateScript() in order to retrieve the variable's data. Or maybe even I could put the data right into the title!

Would the above actually work? Is there a better way to accomplish that goal?

Thanks!
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Victor Gubin
83 posts since
Dec 17, 2007
1. Aug 7, 2008 3:47 PM in response to: Azbok
Re: Best method of bidirectional communication java <-> web page?
I think that AJAX approach (ie page updates itself as needed) a lot better than the use evaluateScript or setContent functions.
This will be much more correct than modification of browser for a specific web page.

Though you can use any of the methods.
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Azbok
3 posts since
Jul 15, 2008
2. Aug 7, 2008 5:13 PM in response to: Victor Gubin
Re: Best method of bidirectional communication java <-> web page?
Thanks for your response. The reason why I asked is because I currently have an ajax + comet (a.k.a. never ending loading of an iframe from a server) setup for the web pages since they are real time apps. The issue becomes that if there are many web applications using that technique, there are many connections to the main server. The other issue is that some data is 'local' between the web app and the java program. I was thinking both to avoid all the connections to the main server, that there can be 1 connection from the java to the main server. Since the java app will be now getting all the data, it can just inject the data in a 'standard way' into the web page (all web pages would have a standard javascript API to allow for this).

Another method could be to just build in an embedded web server into the java app and then relay the appropriate data to the appropriate comet connection. I was looking to not use this approach to avoid having to build a connection relay system where instead I could just inject the data directly. The embedded java webserver is the most normal way to do this though.

The advantage of using the title change event and data injection is that there's less overhead with not having to relay any messages and no need for web app connections. It's probably best to do things in a standard way, but at the same time it's good to know that you could do bidirectional communication like that if one wants to.

Thanks

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