1. Google Web Tool Kit
(aka GWT)
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2. contents
• w is GWT?
hat
• where did it com from
e ?
• w does it all m
hat ean?
• w uses GWT?
ho
• w to get som
ant e?
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3. w is GW
hat T?
GWT is Java W developm
eb ent
GWT allow w developers to create AJAX
s eb
applications in Java
your Java code is com piled into AJAX (HTML
and JavaScript) W eb
applications like Google M aps and Google Mail
so, basically you can w your front end code in
rite
Java (and HTM L)
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4. w is GW
hat T?
GWT produces code capable of running on all
of the m ajor browsers, such as IE, Firefox,
Safari, Opera, and handles the com patibility
issues for you by com piling different outputs
for different brow sers
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5. w is GW
hat T?
Co mpo ne nts and APIs
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6. w is GW
hat T?
Co mpo ne nts
JavaS c ript Co mpile rs
GWT compiler converts Java code into JavaScript code
GWT obfuscates the com piled output so that everything is com pressed
Java codes which are suppose to be com piled in to JavaScript needed to be
JDK (Java Developm Kit) 1.4 com
ent pliant
JS NI (JavaScript Native Interface)
the JavaScript Native Interface, or JSNI for short, allow us to execute
s
JavaScript from Java, as w as execute Java from JavaScript
ell
this is made possible by the GW com
T piler that can m erge native JavaScript
code w the JavaScript code that is generated from Java
ith
JRE Emulatio n Library
this library contains the m com only used parts of the full JRE, w
ost m hich may
be used in your projects and can be compiled to JavaScript
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7. w does it all m
hat ean?
We b apps with a De s kto p lo o k and fe e l
recent trends show that w the advance in w 2.0,
s ith eb
w are increasingly trying to give W Applications
e eb
the “
feel” desktop applications
of
noww GWT w get a pool of w
ith e idgets and panels
using w hich w can use build w applications like
e eb
desktop applications
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8. w does it all m
hat ean?
s o me GWT APIs
Widg e ts and Pane ls
GWT ships w a large set of w
ith idgets and panels available for use
Instead of layout m anagers GWT provides a set of panels that display
their children in a specific manner
Re mo te Pro c e dure Call
GWT includes several w rappers of varying complexity and capability
around the JavaScript XM Http Request object
L
Includes set of classes for supporting the JavaScript Object Notation
(JSON) m essage form at
(GW T-Rpc) that allow you to send Java objects betw
s een the brow and
ser
server w ithout the need to translate them
XML pars e r
Because the parsing is done by the brow and not by GWT, you get
ser
the performance benefit of native code execution
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9. w does it all m
hat ean?
whe n to us e GWT:
good for w hen you have a Java back end
if you like Java
newUIs from scratch
som other fram orks are good for enhancing existing UIs
e ew
lic e ns ing :
open source as of 1.3 (Dec 2006)
Apache 2.0 license
no restrictions on developed apps
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10. w uses GWT?
ho
http://images.google.com agelabeler/
/im
http://gpokr.com /
http://w w
w .openkm .com /
http://beta.contactoffice.com /
viewexamples:
http://gwt.google.com/samples/Showcase/Showcase.html
#Cw DecoratorPanel
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11. w to get som
ant e?
hello@momentumdesignlab.com
1.866.542.7124
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