Transcript J2ME and WAP Technologies

J2ME and WAP Technologies
CSCI 5939.02 – Independent Study
Fall 2002
Presented by: Kashif Syed
Introduction
Introduction: WAP, J2ME
J2ME and WAP: Together forever?
J2ME MIDP and WAP Complementary
Technologies
Conclusions
Bibliography
WAP
WAP was designed to allow wireless devices to access
internet and intranet applications
WAP Forum was founded by Phone.com, Ericsson, Nokia and
Motorola in June 1997
WAP Forum goal was to offer license-free standard to the
wireless industry
It’s a browser technology that allows user to browse WAPenabled web sites.
Limitations:
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Requires key improvements in security
Requires Constant airtime for stand-alone or offline operations
Limits rich user interface
J2ME
J2ME technology is a highly optimized Java runtime
environment specifically for small devices.
It is NOT a replacement for WAP
Benefits:
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Platform Independence
Simple Programming Language
Rich Network Functionality
Built-in Security Model
Rich set of Graphical User Interface
J2ME & WAP: Together forever?
What does the future hold?
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Phone manufacturers will continue to build more
sophisticated devices that will support and
enhance services and the user’s experience.
Java being an established platform, J2ME
technology will appeal to the developers, which
will lead to better wireless applications.
J2ME & WAP: Together
forever?(2)
Tools of the trade:
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WAP was developed on the established
infrastructure utilizing the investments already
made in programming, applications etc.
Many WAP toolkits & J2ME Wireless Toolkits exists
which will help developers to create feature-rich
content and applications based on J2ME
J2ME & WAP: Together
forever?(3)
Future challenges and changes:
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3G systems will provide high speed data transfer
and multimedia data services.
J2ME has been selected as the industry standard
for wireless devices by the Third Generation
Partnership Project.
J2ME & WAP: Together
forever?(4)
But is it secure?
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WAP uses WTLS specifications which has notable
holes.
Data is not secure when it is handed over from
WTLS to SSL.
J2ME is highly secured as it has built in sandbox.
For more security, J2ME applications can be
developed which make use of RMI technology.
J2ME & WAP: Together
forever?(5)
Final Thoughts:
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In all WAP & J2ME are must haves for those
venturing into the mobile space.
Combination of WAP, Java and increase of
bandwidth will make internet access very easy and
enjoyable.
J2ME MIDP and WAP Complimentary
Technologies
Wireless applications can be developed using WAP
technology or using the Mobile Information Device
Profile (MIDP)
Java plays an important role in both these
technologies.
 In WAP, Java Servlets and JSPs can be used to generate WML
dynamically.
 In MIDP applications (also called MIDlets), java is the
programming language.
WAP Programming Model
The WAP programming model is similar to the Web
programming model.
Sample WML Document
<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.2//EN"
"http://www.wapforum.org/DTD/wml12.dtd">
<wml>
<card id="FirstCard" title="First Example">
<p>
Hello World
</p>
</card>
</wml>
Output
MIDP Programming Model
It is a mix of Java Programming model and the Web
Programming model
MIDlet or a group of MIDlets (know as MIDLet Suite)
is described in a Java Descriptor (JAD) file.
MIDlets run in a MIDlet management software.
MIDlets remain installed on the device until they are
explicitly removed.
MIDlet Sample Program
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class HelloMIDlet extends MIDlet {
// The display for this MIDlet
private Display display;
// TextBox to display text
TextBox box;
public HelloMIDlet() {
}
MIDlet Sample Program (cont..)
public void startApp() {
display = Display.getDisplay(this);
box = new TextBox("First Example", "Hello
World", 20, 0);
display.setCurrent(box);
}
/**Pause is a no-op since there are no background activities or
record stores that need to be closed. */
public void pauseApp() {
}
MIDlet Sample Program (cont..)
/** Destroy must cleanup everything not handled by
the garbage collector. In this case there is nothing to
cleanup. */
public void destroyApp(boolean unconditional) {
}
}
Output:
WAP and MIDP: what can they learn
from each other?
MIDP provides both high-level and low-level graphics
APIs which are important for entertainment
applications.
MIDlets can be run even when the server is not
available.
WML provides tags and presentation attributes. It
does not define an interaction model.
WAP supports phone functionalities like address
book. There are no comparable APIs in MIDlet.
Integrating WAP and J2ME
MIDP
WAP and MIDP are complementing
technologies and not competing technologies.
MIDlets can be integrated into WML page.
Bibliography
Tim Fielden and Ana Orubeondo (InfoWorld
Test Center). J2ME and WAP: Together
forever? JavaWorld. December 2000.
Qusay H. Mahmoud. J2ME MIDP and WAP
Complementary Technologies. February 2002
Yu Feng and Dr. Jun Zhu. Wireless Java
Programming with J2ME. Sams Publishing
2001.