JAVASCRIPT

Intergrate DWR into Your Java Web Application

If you want to build your Ajax application around a JavaScript framework, you will need to use Direct Web Remoting code. This article shows you how. It is excerpted from Hack 43 from the book Ajax Hacks, written by Bruce W. Perry (O'Reilly; ISBN: 0596101694). Copyright © 2007 O'Reilly Media, Inc. All rights reserved. Used with permission from the publisher. Available from booksellers or direct from O'Reilly Media.

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By: O'Reilly Media

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July 24, 2008

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Think back to the simple XML file that we just added to the web application. The first twoscripttags reference the JavaScript names we bound to the Java classes that we want to remote:JsBikeBeanandJsDate. The XML file configured certain Java classes to be used with these names in JavaScript code. Remember the dwr.jar file that we installed in the web application? It contains two JavaScript libraries, engine.js and util.js. The first of these files is required to use DWR; the second is optional and contains a bunch of DWR functions that the client-side code can use.

The URL that thescripttag uses, such as /parkerriver/dwr/interface/JsBean.js, connects to the special DWR servlet that we enabled. The servlet in turn makes available to our code the public methods of the Java classes that we configured in XML. The next few hacks will use these classes and functions.

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