Developing Java Web Applications

Developing Java Web Applications Dr. Harry Chen CMSC 491S/691S February 11, 2008

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object]

A canonical Web architecture Do you see any technical issues in this architecture? Source: http://www.ibm.com/developerworks/ibm/library/it-booch_web/

Stateless communication ,[object Object],[object Object]

Thin client vs. Thick (fat) client ,[object Object],[object Object],[object Object],Thin clients live here. Thick clients live here.

How do we create View? ,[object Object],[object Object],[object Object],Raw data View (HTML, PDF, etc) How will be the Views be generated?

Overhead in access data ,[object Object],[object Object],SQL DB HTML Do I have to call “SELECT”, “INSERT”, “UPDATE” all the time?

Framework ,[object Object],Option 2: Use framework Your Goal Option1: Build everything from scratch…

Framework: It’s a juggle out there. ,[object Object],JavaScript Backbase Clean AJAX Dojo Toolkit Echo Ext JQuery Microsoft AJAX Library Mochikit MooTools OpenLink AJAX Toolkit Prototype JavaScript Framework qooxdoo Rialto Toolkit Rico Script.aculo.us SmartClient Spry framework Yahoo! UI Library ASP.NET MonoRail DotNetNuke CSLA ASP.NET MVC Framework Java Apache Cocoon Apache Struts AppFuse Aranea framework Click [ fleXive ] Google Web Toolkit Grails Hamlets ICEfaces IT Mill Toolkit ItsNat JavaServer Faces Java JBoss Seam Makumba OpenLaszlo OpenXava Oracle ADF Reasonable Server Faces RIFE Shale Framework (software) SmartClient Spring Framework Stripes (framework) Tapestry ThinWire WebObjects WebWork Wicket framework ZK Framework ztemplates Perl Catalyst Interchange Maypole Mason PHP Akelos PHP Framework Antares Framework CakePHP Canvas Framework CodeIgniter DIY Framework Drupal epesi FUSE Horde Joomla ! KohanaPHP MODx PHP For Applications PHPOpenbiz PostNuke PRADO Qcodo QPHP Framework Seagull PHP Framework Simplicity PHP framework Symfony ColdFusion ColdBox ColdFusion on Wheels ColdSpring Fusebox Mach-II Model-Glue onTap

Java Servlet technology ,[object Object],Source: http://www.informit.com/articles/article.aspx?p=26920

HelloWorld Servlet Set HTTP Header: Content-Type (HTML) Creates the HTML page content Implementation that handles HTTP GET request Outputs the HTML into the HTTP Response Do you see any technical issues with this implementation? Source: http://www.informit.com/articles/article.aspx?p=26920

JSP (Java Servlet Pages) ,[object Object],[object Object],[object Object],[object Object],[object Object]

HelloWorld JSP Source: http://mainline.brynmawr.edu/~dkumar/JSP/ Use Java as if it’s a scripting language

Open issues in Java Servlet technology ,[object Object],[object Object],[object Object],[object Object],[object Object]

MVC: Model-View-Control ,[object Object],[object Object],http://java.sun.com/blueprints/patterns/MVC-detailed.html

Example: J2EE webapp ,[object Object]

Example: J2EE webapp (cont.) ,[object Object],All DB access and update operations are implemented here. All business logic and applications states are stored here. HTML, PDF and whatever goes here. They read and parse data object from the Model

Problems with MVC ,[object Object],[object Object]

WebWork ,[object Object],[object Object],http://www.opensymphony.com/webwork/

WebWork terminology ,[object Object],[object Object],[object Object],[object Object]

WebWork workflow Read: http://www.javaworld.com/javaworld/jw-03-2004/jw-0329-webwork.html

WebWork HelloWorld ,[object Object],[object Object],[object Object],[object Object],[object Object]

Action: HelloWorld.java Extends a standard Action superclass. Implement the business logic How to access the Bean (the message)

View: helloworld.jsp Use JSP Tag lib to access our Bean (the message) If you don’t like to use JSP, you have other options: Freemarker and Velocity

WebWork Configuration: HelloWorld ,[object Object],Define our Action and name it “helloworld” If the action returns “ success ”, then apply the “ hello.jsp ” template

WebWork: HelloWorld Output Read: http://www.javaworld.com/javaworld/jw-10-2005/jw-1010-webwork.html

Dynamic object instantiation ,[object Object],[object Object],[object Object],[object Object]

Inversion of Control (IoC) ,[object Object],[object Object],Problem : The use of “MovieFinderImpl” is hardwired into “MovieLister”. Change this logic will require code rewrite and re-compile “MovieFinderImpl” Read: http://martinfowler.com/articles/injection.html

IoC Solution ,[object Object],Solution : If you want to use a different “MovieFinder”, just change how “Assembler” calls <creates>. <creates>

Spring IoC ,[object Object],Spring IoC implements a flexible “Assembler”. Developers can tell this “Assembler” how to perform “<create>” via XML configuration. http://static.springframework.org/spring/docs/2.0.x/reference/beans.html

Spring IoC: HelloWorld in gnizr ,[object Object],http://code.google.com/p/gnizr/wiki/HelloWorldDemo

Spring IoC: a more complex example (1) The Class object “folderTagListener” is dynamically associated with “bookmarkManager” via a configuration file, not hardwired in the source of “bookmarkManager”. (2) Developers also fine tune the number of WorkerThread to be instantiated by “bookmarkManager” in the same configuration file. (1) (2)

Jave project management ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Problems I have faced ,[object Object],[object Object],[object Object],[object Object]

Apache Maven ,[object Object],[object Object],[object Object],[object Object],[object Object],http://maven.apache.org/

POM file ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Try Maven in 5 minutes http://maven.apache.org/guides/getting-started/maven-in-five-minutes.html

Summary ,[object Object],[object Object],[object Object]

Developing Java Web Applications

Recomendados

Recomendados

Mais conteúdo relacionado

Mais procurados

Mais procurados (20)

Destaque

Destaque (20)

Semelhante a Developing Java Web Applications

Semelhante a Developing Java Web Applications (20)

Mais de hchen1

Mais de hchen1 (13)

Último

Último (20)

Developing Java Web Applications