Started by the Italian student Stefano Mazzocchi. Java Apache XML (JAX) Lektion 11: Cocoon. 4. Servlet JSP Framework Struts

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1 Cocoon is a powerful framework for XML web publishing which brings a whole new world of abstraction and ease to consolidated web site creation and management based on the XML paradigm and related technologies. Started by the Italian student Stefano Mazzocchi Grundlagen 2. Servlets 3. JSP JAR Files TCP/IP, Sockels HTTP Java Web Service Developer Pack (WSDP) Ant JAVA Fehlermeldungen Servlet Framework Tomcat Servlet Container Lebenszyklus Hello World Servlet Implizite Objekte Einfache Servlets Konfiguration (web.xml) Anfrage weiterleiten Filter Cookies Session Tracking Architektur Syntax, Skripte, Direktiven Implizite Objekte Aktionen JavaBeans Custom Tags 4. Servlet JSP Framework Struts 5. XML Architektur Planung einer Webanwendung Implementierung Grundlagen DTD & Schemata Parser (SAX, DOM) XPath XSLT XSL-FO 6. XML Framework Cocoon Architektur Cocoon Beispiel Sitemap XSP 7. JAVA Webservices SOAP UDDI / ebxml WSDL Implementierung eines Webservice

2 Was ist cocoon? XML publishing framework Verwendet XML und XSLT Separation of Concerns, d. h. Trennung von Inhalt, Logik und Darstellung Datenquellen: Filesysteme, RDBMS, LDAP, native XML Datenbanken, und Netzwerkbasierte Quellen Content Ausgabe in HTML, WML, PDF, SVG, RTF, Was ist cocoon? Cocoon ist als Servlet implementiert Als Teil des Apache XML Projekts integriert cocoon unter anderem 4Xerces - XML Parser Apache Cocoon 2 Framework (XML Publishing) 4Xalan - XSLT Prozessor 4FOP XSL Print Formatter Apache Avalon Framework (Component Management) 4 Batik - Scalable Vector Graphics (SVG) Toolkit Apache Xalan 4 (XSLT Processor) Apache Xerces (XML Parser) Custom Components Apache LogKit (Logging) Apache FOP (XSL:FO) Apache Batik (SVG) Other Projects

3 SoC Separation of Concerns pyramid of contracts Klare Trennung der verschiedenen Arbeitsbereiche in einem Entwicklungsteam Management: Inhalt, Abläufe, Aufbau Content: redaktioneller Teil aller Inhalte Logic: Integration der dynamischen Inhalte Style: Präsentation, look & feel, Grafik Austausch nach bestimmten Regeln möglich, die vom Management gesteuert werden 11-5 SoC Separation of Concerns Beispiel <page> <content> <para>today is <dynamic:today/> </para> </content> </page> <dynamic:today/> regelt die Logik Inhalt Beziehung

4 SoC Separation of Concerns Content: XML Files, RDBMS, LDAP, native XML Datenbanken, Netzwerkbasierte Quellen, Streams Style: XSL Files Logic: in XSL Files als XSP instructions... <xsp:logic> // Java Code, SQL,... String msg = "Hello, world!"; </xsp:logic>... XSP kann auch in Logicsheets oder in Taglibs definiert und dann in XSL Files als Komponente wiederverwendet werden 11-7 Pipeline request Request nach Muster verarbeiten XML Source generieren Generator Transformation nach XSL-Vorgaben Evtl. Weitere XML Quellen aggregieren Ausgabe in ein bestimmtes Format Transformer Aggregator stylesheet Serializer

5 Request - Response Zyklus Request Sitemap Request Transformer Generator Transformer Serializer XML DB XSL Response (HTML) 11-9 Sitemap Die Sitemap entält Konfigurationsinformationen für die Cocoon engine Matchers für URI Patterns Selectors Unterscheidungen im Pipeline-Ablauf Generators XML Sources einlesen Transformers XML Transformationen Serializers Ausgabeformat definieren Die Sitemap wird zu einer ausführbaren Klasse kompiliert

6 Sitemap - Matcher <map:match pattern="vortrag/**"> <map:mount check-reload="yes"src="vortrag/" uriprefix="vortrag"/> In der main-sitemap können weitere Sitemaps für Unterprogramme gemountet werden Baumstruktur der Sitemaps für einfachere Wartung Sitemap processing pipeline <map:match pattern="hello.html"> <map:generate src="hello-page.xml"/> <map:transform src="simple-page2html.xsl"/> <map:serialize type="html"/> URI pattern hello.html erkennen Aus der Source hello-page.xml xml auslesen Nach den Regeln des XSL stylesheets Transformieren Als html Ausgabe serialisieren

7 Sitemap Selector <map:match pattern="hello.html"> <map:generate src="hello-page.xml"/> <map:select> <map:when test="wap"> <map:transform src="simple-page2wml.xsl"/> </map:when> <map:when test="explorer"> <map:transform src="simple-page2html.xsl"/> Selector HTML Capable Device HTML Stylesheet Serialize HTML File Generator Browser Selector WML Stylesheet Serialize WML Single Entry Point: E.g. WML Capable Device

8 Einfache Anwendung Wie geht s? 1. Content <?xml version="1.0"?> <page> <title>hello</title> <content> <para>this is my first Cocoon2 page!</para> </content> </page>

9 Wie geht s? 2. Style <?xml version="1.0"?> <xsl:stylesheet version="1.0" xmlns:xsl=" <xsl:template match="page"> <svg width="450" height="160"> <defs> <filter id="blur1"><fegaussianblur stddeviation="3"/></filter> <filter id="blur2"><fegaussianblur stddeviation="1"/></filter> </defs> <g title="this is a tooltip"> <rect style="fill:#0086b3;stroke:#000000;stroke-width:4;filter:url(#blur1);" x="30" y="30" rx="20" ry="20" width="400" height="80"/> <xsl:apply-templates/> </g> </svg> </xsl:template> <xsl:template match="para"> <text style="fill:#ffffff;font-size:24;font-family:trebuchetms- Bold;filter:url(#blur2);" x="65" y="80"> <xsl:apply-templates/> </text> </xsl:template> </xsl:stylesheet> Wie geht s? 3. Logic - 4. Management <map:match pattern="hello.svg"> <map:generate src="docs/samples/hello-page.xml"/> <map:transform src="stylesheets/page/simple-page2svg.xsl"/> <map:serialize type="svg2jpeg"/>

10 weitere Hello World Beispiele <map:pipeline> <map:match pattern=""> <map:redirect-to uri="welcome"/> <map:match pattern="welcome"> <map:generate src="docs/samples/samples.xml"/> <map:transform src="stylesheets/simple-samples2html.xsl"/> <map:serialize/> <map:match pattern="hello.html"> <map:generate src="docs/samples/hello-page.xml"/> <map:transform src="stylesheets/page/simple-page2html.xsl"/> <map:serialize type="html"/> <map:match pattern="hello.wml"> <map:generate src="docs/samples/hello-page.xml"/> <map:transform src="stylesheets/page/simple-page2wml.xsl"/> <map:serialize type="wap"/> Sitemap <?xml version="1.0"?> <map:sitemap xmlns:map= " <map:components/> <map:views/> <map:resources/> <map:pipelines/> <map:action-sets/> </map:sitemap> Action JAVA Program

11 SVG erzeugen <map:match pattern="hello2.svg"> <map:generate src="docs/samples/hello-page.xml"/> <map:transform src="stylesheets/page/simple-page2svg.xsl"/> <map:serialize type="svgxml" /> Verschieden Ausgaben <?xml version="1.0"?> <molecule convention="mdlmol" id="histamine" title="histamine"> <date day="23" month="11" year="1995"> </date> <atomarray> <atom id="a1"> <string builtin="elementtype">c</string> <float builtin="x2"> </float> <float builtin="y2"> </float> </atom> <atom id="a2"> <string builtin="elementtype">c</string> <float builtin="x2">0.2185</float> <float builtin="y2"> </float> </atom> <atom id="a3">

12 Sitemap Legi I <?xml version="1.0"?> <map:sitemap xmlns:map="  <map:components> <map:generators default="file"/> <map:transformers default="xslt"/> <map:readers default="resource"/> <map:serializers default="html"/> <map:selectors default="browser"/> <map:matchers default="wildcard"/> <map:serializer name="fo2ps" src="org.apache.cocoon.serialization.fopserializer" mime-type="application/postscript"/> <map:serializer name="fo2pdf" src="org.apache.cocoon.serialization.fopserializer" mime-type="application/pdf"/> <map:serializer name="wap" mime-type="text/vnd.wap.wml" src="org.apache.cocoon.serialization.xmlserializer"> <doctype-public>-//wapforum//dtd WML 1.1//EN</doctype-public> <doctype-system> <encoding>ascii</encoding> <omit-xml-declaration>yes</omit-xml-declaration> </map:serializer> </map:components>  Sitemap Legi II <map:match pattern="*.*.html"> <map:generate src="xml/{1}.{2}.xml"/> <map:transform src="xsl/legi_html.xsl"/> <map:serialize type="html"/> <map:match pattern="*.*.pdf"> <map:generate src="xml/{1}.{2}.xml"/> <map:transform src="xsl/legi_pdf.xsl"/> <map:serialize type="fo2pdf"/> <map:match pattern="*.*.ps"> <map:generate src="xml/{1}.{2}.xml"/> <map:transform src="xsl/legi_pdf.xsl"/> <map:serialize type="fo2ps"/> <map:match pattern="*.*.wml"> <map:generate src="xml/{1}.{2}.xml"/> <map:transform src="xsl/legi_wml.xsl"/> <map:serialize type="wap"/> Institut für Informatik

13 Beispiele extensible Server Pages (XSPs) Analog zu JSP nur Trennung von Code Logic Presentation

14 extensible Server Pages II XSP Bsp. I <?xml version="1.0" encoding="iso "?> <xsp:page language="java" xmlns:xsp=" <xsp:logic> static private int counter = 0; private synchronized int count() { return counter++; } </xsp:logic> <page> <p>i have been requested <xsp:expr>count()</xsp:expr> times.</p> </page> </xsp:page>

15 XSP Bsp. II <?xml version="1.0" encoding="iso "?> <xsp:page language="java" xmlns:xsp=" xmlns:xsp-request=" xmlns:log=" xmlns:capture=" <page> <log:logger name="xsp-sample" filename="xsp-sample.log"/> <log:debug>jax: start jax page</log:debug> <title>a Simple XSP Page</title> <content> <capture:fragment-variable name="page_part"> <para>these 2 paragraphs were generated at the start of the XSP, and captured for insertion at the end.</para> <para>brought to you by Cocoon2 at <xsp:expr>new Date()</xsp:expr>.</para> </capture:fragment-variable> <para>i was requested as the URI: <b><xsp-request:get-uri as="xml"/></b></para> XSP Bsp. II <para>the following list was dynamically generated:</para> <ul> <xsp:logic> <![CDATA[ for (int i=0; i<3; i++) { ]]> <li> Punkt: <xsp:expr>i</xsp:expr> </li> <![CDATA[ } ]]> </xsp:logic> </ul> <xsp-request:get-parameter-values name="name"/> <xsp-request:get-parameter-names/> <para> Header "user-agent" as String: <xsp-request:get-header name="user-agent"/> </para> <xsp:expr>page_part</xsp:expr> </content> <log:debug>processing the end of the JAX page</log:debug> </page> </xsp:page>

16 Model 1 in the servlet world HTTP request JSP page template HTTP response Java bean Data source Model 1 in Cocoon HTTP request Page template Pipeline HTTP response Data source Cocoon

17 Model 2 in the servlet world (Struts) HTTP request Controller servlet instantiates HTTP response JSP page template Java bean Data source Benefits of Model 2 Logic and controlling the flow of pages are separated from presentation Uses the well-understood Model-View- Controller pattern Easier to scale as the application (read number of pages) grows

18 Control flow: MVC+ for Cocoon? HTTP request HTTP response 1 Controller 2 flow script Pipeline Business logic Context 3 Data source Quellen Cocoon Homepage: Apache XML Project: Cocoon howtos: Cocoon tips: