java™ ee 5 blueprints for ajax-enabled web 2.0...
TRANSCRIPT
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2006 JavaOneSM Conference | Session TS-1615 |
TS-1615
Java™ EE 5 BluePrints for AJAX-Enabled Web 2.0 ApplicationsSean Brydon, Greg Murray, Inderjeet Singh, Mark BaslerJava BluePrintsSun Microsystems Inc.http://blueprints.dev.java.net/
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2006 JavaOneSM Conference | Session TS-1615 | 2
Goal of Our Talk
Learn how to architect and build web applications using Java™ Platform, Enterprise Edition (Java EE) 5 technology
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2006 JavaOneSM Conference | Session TS-1615 | 3
Agenda
Definitions: Web 2.0, Rich Web Applications, AJAX Demo Guidelines JavaServer™ Faces Technology Approach Status and Futures Q & A
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2006 JavaOneSM Conference | Session TS-1615 | 4
Web 2.0
● Web as a Platform● Collection Intelligence
● Folksonomy—Collaborative Categorization● Data is key and should be shared● Software is in constantly evolving
● Software release cycles dead?● Lightweight Programming Models
● SOAP/ REST ● The Network is the computer● Rich User Experience
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2006 JavaOneSM Conference | Session TS-1615 | 5
Conventional Rich Web Applications
● Plugins/ Applets● Frames/ iframes ● Dumb browser● Server Centric● Page to Page navigation based
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2006 JavaOneSM Conference | Session TS-1615 | 6
Conventional Interaction Model
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2006 JavaOneSM Conference | Session TS-1615 | 7
High Level AJAX Interaction Model
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2006 JavaOneSM Conference | Session TS-1615 | 8
AJAX
● AJAX is using JavaScript, namely the XmlHttpRequest object, to communicate asynchronously with a server-side component and dynamically update the source of an HTML page based on the resulting XML/ Text response
Asynchronous JavaScript™programming language + XML
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2006 JavaOneSM Conference | Session TS-1615 | 9
Anatomy of an AJAX Interaction
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2006 JavaOneSM Conference | Session TS-1615 | 10
HTML Page Event<form name="autofillform" action="autocomplete" method="get"> <table border="0" cellpadding="5" cellspacing="0"> <tr><td><b>Employee Name:</b></td><td> <input type="text" id="complete-field" size="20" autocomplete="off" onkeyup="doCompletion();"> </td><td align="left"> <input id="submit_btn" type="Submit" value="Lookup Employee"> </td></tr> <tr><td id="auto-row" colspan="2"> <td/></tr> </table></form><div style="position: absolute; top:170px;left:140px" id="menu-popup"> <table id="completeTable" border="1" bordercolor="black" cellpadding="0" cellspacing="0" /></div>
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2006 JavaOneSM Conference | Session TS-1615 | 11
JavaScript Based Event Handlerfunction getXHR() { if (window.XMLHttpRequest) { return new XMLHttpRequest(); } else if (window.ActiveXObject) { return new ActiveXObject("Microsoft.XMLHTTP"); }}
function doCompletion() { var url = "autocomplete?action=complete&id=" + encodeURI(target.value); var req = getXHR(); req.onreadystatechange = processRequest; req.open("GET", url, true); req.send(null);}
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2006 JavaOneSM Conference | Session TS-1615 | 12
Servletpublic void doGet(...) { String targetId = request.getParameter("id");Iterator it = emps.keySet().iterator();while (it.hasNext()) { EmployeeBean e = (EmployeeBean)emps.get((String)it.next()); if ((e.getFirstName().toLowerCase().startsWith(targetId) || e.getLastName().toLowerCase().startsWith(targetId)) && !targetId.equals("")) { sb.append("<employee>"); sb.append("<id>" + e.getId() + "</id>"); sb.append("<firstName>" + e.getFirstName()... ... sb.append("</employee>");} } response.setContentType("text/xml"); response.getWriter().write("<employees>" + sb.toString() + "</employees>"); }
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2006 JavaOneSM Conference | Session TS-1615 | 13
JavaScript Based Client Callbackfunction postProcess(responseXML) { clearTable(); var emps = responseXML.getElementsByTagName("employees")[0]; if (emps.childNodes.length > 0) { completeTable.setAttribute("bordercolor", "black"); completeTable.setAttribute("border", "1"); } else { clearTable(); } for (loop = 0; loop < emps.childNodes.length; loop++) { var e = emps.childNodes[loop]; var firstName employee.getElementsByTagName("firstName")[0]; var empId = e.getElementsByTagName("id")[0]; appendEmployee(firstName.childNodes[0].nodeValue, lastName.childNodes[0].nodeValue,employeeId.childNodes[0].nodeValue); }
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2006 JavaOneSM Conference | Session TS-1615 | 14
DEMOAJAX Demo
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2006 JavaOneSM Conference | Session TS-1615 | 15
Agenda
Definitions: Web 2.0, Rich Web Applications, AJAX Demo Guidelines JavaServer™ Faces Technology Approach Status and Futures Q & A
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2006 JavaOneSM Conference | Session TS-1615 | 16
AJAX Guidelines● JavaScript Programming Language Libraries● Usability● I18n● AJAX Design● Architectures● HTTP methods● Return content-types● Usecases/ Patterns● Security
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2006 JavaOneSM Conference | Session TS-1615 | 17
JavaScript ProgrammingLanguage Libraries
● Prototype● RICO● Script.aculo.us● Dojo● Zimbra
Recommendation: Adopt a library anddon't try to re-invent the wheel
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2006 JavaOneSM Conference | Session TS-1615 | 18
Usability
● Back/ Forward/ Refresh Buttons● Bookmarking● URL sharing● Printing● 508 Compliance
Recommendation: Consider the meaning of each andweigh the benefits when designing your application
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2006 JavaOneSM Conference | Session TS-1615 | 19
XMLHttpRequest (XHR)
● HTTP Method● GET—When the result of N > 0 requests is the same ● POST—When operation has “side-effects” and
changes the state on the server● Concurrent Requests
● Max is 2 (IE) Consider—Pooling● JavaScript Technology Closures—Inline functions
Recommendation: Take care using the XHR. Use Closuresto track the requests/ callbacks. Consider using a library
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2006 JavaOneSM Conference | Session TS-1615 | 20
Internationalization (I18n)● Page Content Type
● <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
● Use JavaScript encodeURI when building URLs or sending localizable content
● Call request.setCharacterEncoding("UTF-8") before retrieving any parameters from Java EE
● Call response.setContentType(“text/xml;charset=UTF-8”)
Recommendation: Use UTF-8 since it supports thewidest number of languages and browsers
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2006 JavaOneSM Conference | Session TS-1615 | 21
AJAX Design
● Add Around the Edges● Small components (autocomplete, tree, partial submit)
● Page is the Application● Client and Server split MVC responsibilities
Recommendation: Consider designing initial AJAX applicationsaround the edges as you gain experience. Don't go overboard
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2006 JavaOneSM Conference | Session TS-1615 | 22
Architectures
● Server Centric● Server Renders Everything
● Client Centric● More JavaScript technology● Page as the Application● Client Controller
Recommendation: If you already have a server centric architectureconsider adding some client centric components. When using aclient centric architecture consider using an existing library
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2006 JavaOneSM Conference | Session TS-1615 | 23
Response Content Type● XML● HTML● Text
● Post processing on client● Inject directly into the page
● JavaScript Technology● Evaluated in JavaScript programming language using eval()● JavaScript based object representations of data(JSON)
Recommendation: Use XML for structured portable data.Use plain text for when injecting content into the HTML.Use JavaScript to return objectrepresentations data
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2006 JavaOneSM Conference | Session TS-1615 | 24
Uscases/Patterns
● Advanced Controls● Autocomplete● Observer● Master Details● Partial Submit● Server Side Validation● Value List HandlerRecommendation: Recommendation: Use AJAX to Enhancethe user experience
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2006 JavaOneSM Conference | Session TS-1615 | 25
Security● Sandboxed
● Cross Domain XMLHttpRequest restricted● Access to file system restricted
● HTTPS – Requires a page refresh● JavaScript Programming Language Libraries for
Encryption Exist● JavaScript code visible to the world
Recommendation: Use HTTPS when you want to secure AJAXcommunication. Don't put compromising code in your JavaScript
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2006 JavaOneSM Conference | Session TS-1615 | 26
Performance http://www.macrumors.com/events/mwsf2006-stats.php“We peaked at approximately 103,000 simultaneous web visitors and 6,000 IRC viewers during the Keynote speech and transmited over 32 GB of data in a three hour period. If not for the efficiency of the MacRumorsLive AJAX update system, the same webcast would have required approximately twice as many servers and would have had to transfer almost 6 times as much data (196 GB).”
● Patterns—Value List Handler/ Master Details● JavaScript Technology—Compression
Recommendation: AJAX Performs! Use patterns and try to reducethe size of your JavaScript files. Consider dynamic loading of script
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2006 JavaOneSM Conference | Session TS-1615 | 27
Agenda
Definitions: Web 2.0, Rich Web Applications, AJAX Demo Guidelines JavaServer™ Faces Technology Approach Status and Futures Q & A
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2006 JavaOneSM Conference | Session TS-1615 | 28
JavaServer Faces Technology Component Approach
● Control Content Rendering ● Control of Server Side Logic● All in one component● Reusable● Usable in a tool● Hide AJAX complexity from page developers
Benefits include:
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2006 JavaOneSM Conference | Session TS-1615 | 29
Anatomy of an AJAX enabled JavaServer Faces Based Component
Java EEClient
Autocomplete JSF Component
RenderPhaseListener
SessionBean ApplicationBean
component.js
FacesServlet
<script type=“text/javascript”src=“faces/ajax-textfield.js”
JavaScript
XMLHttpRequest
XMLHttpRequest Callback<items><item>422 Greg Murray</item><item>232 Gregg Murphy</item><item>222 George Kluugy</item></items>
Search
GName:
Greg MurrayGregg MurphyGeorge Kluugy
onkeypress()event
Update HTMLSource
AutoCompleteTextField
AutoCompleteTextFieldTag
AutoCompleteTextFieldRenderer
items[] doCompletion()
GET faces/ajax-textfield.js
GET faces/ajax-autocomplete.js
Form POST to Search URL
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2006 JavaOneSM Conference | Session TS-1615 | 30
Page Developer’s View of JavaServer Faces Based Component<ajaxTags:completionField size="40" id="cityField" completionMethod="
#{ApplicationBean.completeName}"/>
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2006 JavaOneSM Conference | Session TS-1615 | 31
Server Side Logic for JavaServer Faces Based Component
public String[] completeName() { ArrayList results = new ArrayList(); Iterator it = employees.keySet().iterator(); while (it.hasNext()) { EmployeeBean e = (EmployeeBean)employees.get((String)it.next()); if ((e.getFirstName().toLowerCase().startsWith(targetId) ||e.getLastName().toLowerCase().startsWith(targetId)) && !targetId.equals("")) {
results.add(e.getId() + " " + e.getFirstName() +
e.getLastName()); } } return (String[])results.toArray();}
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2006 JavaOneSM Conference | Session TS-1615 | 32
Agenda
Definitions: Web 2.0, Rich Web Applications, AJAX
Demo Guidelines JavaServer™ Faces Technology Approach Status and Futures Q & A
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2006 JavaOneSM Conference | Session TS-1615 | 33
AJAX BluePrints
● Java BluePrints Solutions CatalogEntries on AJAX
● NetBeans™ Technology● Command Line● Written for Project GlassFish
http://glassfish.dev.java.net● Java BluePrints AJAX Components● Java Petstore Demo
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2006 JavaOneSM Conference | Session TS-1615 | 34
Futures
● AJAX Pet Store● More Java BluePrints Solutions Catalog entries● More Java BluePrints AJAX components● Better tool support
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2006 JavaOneSM Conference | Session TS-1615 | 35
Summary
● Java technology provides the ideal platform for AJAX and Web 2.0 style applications
● Use AJAX where it makes sense● Follow the guidelines● The BluePrints team and BluePrints Solutions
Catalog is a great AJAX resources
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2006 JavaOneSM Conference | Session TS-1615 | 36
For More Information
● Java BluePrints Home Page:http://java.sun.com/blueprints/ajax.html
● AJAX Components http://blueprints.dev.java.net/ajaxcomponents.html
● Java BluePrints Projects on Java.net http://blueprints.dev.java.net/
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2006 JavaOneSM Conference | Session TS-1615 | 37
Q&ASean Brydon, Greg Murray, Inderjeet Singh, Mark Basler