google web toolkit - spatineo€¦ · since gwt 2.0: dev mode code is run in the browser as java...

Google Web ToolkitIntroduction to GWT Development

GeoMashup CodeCamp 2011University of Helsinki

Department of Computer Science

Ilkka Rinne & Sampo Savolainen / Spatineo Oy

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Google Web Toolkit

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Google Web ToolkitCode your browser apps in Java

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Test your app locally in your browser

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Debug your code using regular IDE debuggers

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GWT compiles your app into optimized JavaScript



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GWT compiles your app into optimized JavaScript



Deploy anywhere (it’s just JS + CSS + HTML)

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Don’t Worry About

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Don’t Worry AboutCoding in JavaScript (embed JavaScript code

with JSNI if you really have to)

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Developing in browser (use the Java IDE you like)

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Implementation details of client-server communication over HTTP

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Implementation details of client-server communication over HTTP

Writing cross-browser compatible JavaScript + DOM

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Development ModeSince GWT 2.0: dev mode code is run in the

browser as Java (GWT Dev Plugin)

IDE Java debugging, code hot swapping as you save & refresh. Speeds things up!

Dev mode also runs a local server to simulate your server side GWT code

(RPC Servlets)

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UI ComponentsBasic components for building “Java-like”

GUIs for browser applications:

Page & panel layouts

Buttons, trees, tables, input fields, etc.

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UI Components

Demo: http://gwt.google.com/samples/Showcase/Showcase.html

Basic components for building “Java-like” GUIs for browser applications:

Page & panel layouts

Buttons, trees, tables, input fields, etc.

Extended by third party developers to provide more elaborate components

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http://gwt.google.com/samples/Showcase/Showcase.html#!CwCheckBox

http://gwt.google.com/samples/Showcase/Showcase.html#!CwCheckBox

Google API IntegrationGoogle API integration using separate libraries

Gears API Library 1.3

Gadgets API Library 1.2

Google AJAX Search API Library 1.1

Google Maps API Library 1.1

Google Chart Tools (aka Visualization) Library 1.1

Google Language API Library 1.1

Google Ajax Loader API Library 1.1

Google+ API Library 0.2-alpha

Google Books API Library 0.2-alpha

Google Latitude API Library 0.2-alpha

etc.

Note: use 1.1.1-RC1 for now!

http://code.google.com/p/gwt-google-apis/

Currentlyreleased:

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JRE Emulation LibraryFinal GWT apps run in JavaScript (without JRE)

GWT Provides JRE emulation forJRE 1.5 basic functionality, but not all of it.

http://code.google.com/webtoolkit/doc/latest/DevGuideCodingBasicsCompatibility.html

Be especially careful with time/date handling, regular expressions, number formatting, timers

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Java-to-JavaScript Compiler

When you’re ready to deploy your code, ask GWT to compile

GWT generates JS, HTML, CSS, packages them into a WAR file with image resources etc.

Ready to be deployed on a Java Servlet Containeror Google App Engine

Note: Extract <appname>.nocache.js and <md5>.cache.html + resources from the WAR file to run without a Servlet Container

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Let’s see some code!

GWT Development in Eclipse

Codecamp demo application

Deployment to Google App Engine

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google web toolkit - spatineo€¦ · since gwt 2.0: dev mode code is run in the browser as java...

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