Overview

• One-click launch of application

• Auto-install feature

• Provide versioning/caching feature for update/fast startup

• Provide some API for desktop application

• bundle a JNLP-deployed application in a Web Archive (WAR) file

Architecture

<?xml version="1.0" encoding="utf-8"?>

<jnlp spec="1.0+" codebase=http://localhost:8080/ekp/nd href="http://localhost:8080/ekp/nd/test.jnlp">

<information>

<title>JWS test</title>

<vendor>Netdimensions</vendor>

<homepage href="http://www.netdimensions.com"/>

<description>Test</description>

<icon href="http://www.netdimensions.com/netd_images/logo.jpg"/>

<offline-allowed/>

</information>

<security>

</security>

<resources>

<j2se version="1.3"/>

<jar href="http://localhost:8080/ekp/nd/test.jar"/>

</resources>

<application-desc main-class="test.test"/>

</jnlp>

Example of descriptor

Extra Tag useful in descriptor• Define extra parameter

• <application-desc main-class="Main">     <argument>arg1</argument>     <argument>arg2</argument>

</application-desc> • Define VM parameter

• <j2se version="1.3" initial-heap-size="64m"/> <property name="..." value=".."/>

• Demo

• http://carfield:8080/ekp/nd/test.jnlp

Auto Install• Only For Windows platform• <OBJECT

CODEBASE="http://java.sun.com/products/javawebstart/autodl/jinstall-1_4_1-windows-i586.cab" CLASSID="clsid:5852F5ED-8BF4-11D4-A245-0080C6F74284" HEIGHT=0 WIDTH=0> <PARAM NAME="app" VALUE="http://carfield:8080/ekp/nd/test.jnlp"><PARAM NAME="back" VALUE="true"><!-- Alternate HTML for browsers which cannot instantiate the object --><A HREF="http://java.sun.com/cgi-bin/javawebstart-platform.sh?">Download Java Web Start</A></OBJECT>

• Replace CODEBASE for complete JRE install

• Demo: http://carfield:8080/ekp/nd/test1.html

Java Web Start API• BasicService, which provides a service similar to the

AppletContext.

• DownloadService, which allows an application to interact with the JNLP Client to check if application resources are available locally, and to request them to be downloaded.

Service allow un-trust client execute system function

• FileOpenService

• FileSaveService

• ClipboardService

• PrintService

• PersistenceService, key base persistence store like cookies

• ExtensionInstallerService, which provides an interface for extension installers to communicate with the JNLP Client.

Other Feature

• Able to access system resource using code signing

• Cache the jar in hard-disk

• Packaging JNLP Applications in a Web Archive

• Versioning support:<jar href="http://www.mysite.com/b.jar" version="2.3+"/>