Google Web Tool Kit
(aka GWT)
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contents
I. what is GWT?
II. where did it come from?
III. what does it all mean?
IV. who uses GWT?
V. want to get some?
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what is GWT?
GWT is Java Web development
GWT allows web developers to create AJAX
applications in Java
your Java code is compiled into AJAX (HTML
and JavaScript) Web
applications like Google Maps and Google Mail
so, basically you can write your front end code in
Java (and HTML)
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what is GWT?
GWT produces code capable of running on all
of the major browsers, such as IE, Firefox,
Safari, Opera, and handles the compatibility
issues for you by compiling different outputs
for different browsers
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what is GWT?
Components and APIs
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what is GWT?
Components
JavaScript Compilers
GWT compiler converts Java code into JavaScript code
GWT obfuscates the compiled output so that everything is compressed
Java codes which are suppose to be compiled in to JavaScript needed to be
JDK (Java Development Kit) 1.4 compliant
JSNI (JavaScript Native Interface)
the JavaScript Native Interface, or JSNI for short, allows us to execute
JavaScript from Java, as well as execute Java from JavaScript
this is made possible by the GWT compiler that can merge native JavaScript
code with the JavaScript code that is generated from Java
JRE Emulation Library
this library contains the most commonly used parts of the full JRE, which may
be used in your projects and can be compiled to JavaScript
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what does it all mean?
Web apps with a Desktop look and feel
recent trends shows that with the advance in web 2.0,
we are increasingly trying to give Web Applications
the “feel” of desktop applications
now with GWT we get a pool of widgets and panels
using which we can use build web applications like
desktop applications
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what does it all mean?
some GWT APIs
Widgets and Panels
GWT ships with a large set of widgets and panels available for use
Instead of layout managers GWT provides a set of panels that display
their children in a specific manner
Remote Procedure Call
GWT includes several wrappers of varying complexity and capability
around the JavaScript XML Http Request object
Includes set of classes for supporting the JavaScript Object Notation
(JSON) message format
(GWT-Rpc) that allows you to send Java objects between the browser and
server without the need to translate them
XML parser
Because the parsing is done by the browser and not by GWT, you get
the performance benefit of native code execution
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what does it all mean?
when to use GWT:
good for when you have a Java back end
if you like Java
new UIs from scratch
some other frameworks are good for enhancing existing UIs
licensing:
open source as of 1.3 (Dec 2006)
Apache 2.0 license
no restrictions on developed apps
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who uses GWT?
http://images.google.com/imagelabeler/
http://gpokr.com/
http://www.openkm.com/
http://beta.contactoffice.com/
view examples:
http://gwt.google.com/samples/Showcase/
Showcase.html#CwDecoratorPanel
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want to get some?
hello@momentumdesignlab.com
1.866.542.7124
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