Difference between revisions of "Netbeans/C2/Developing-a-Sample-Web-Application/English-timed"

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| Hiii everybody

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| Welcome to the  tutorial on Introduction to Developing Web Applications on the Netbeans IDE.  

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|We assume that you have the basic working knowledge of netbeans

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| if not please visit  the spoken tutorial website for relevant tutorials on Netbeans

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| Having viewed the first tutorial you would already be familiar

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|For this demonstration I am using the Linux Operating System Ubuntu v11.04 and Netbeans IDE v7.1.1  

 

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|This tutorial will take you through the basics of using Netbeans  to develop web applications.  

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|we will see  

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| setting up a web application project

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|creating and editing web applications source files

 

 

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|creating a java package and a java source file

 

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|Generating the Getter and Setter methods

 

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|Editing the default JavaServer Pages file

 

 

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|Creating a JavaServer pages file

 

 

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|and finally running our web application project

 

 

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|To follow this tutorial, you will need the Netbeans IDE

 

 

 

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|The Java Development Kit (JDK) version 6

 

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|The GlassFish Server Open Source Edition

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|All the above can be downloaded in a single bundle from the link shown on the screen

 

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|and View its presentation in a browser.  

 

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|The application employes (JSP)  JavaServer Pages to ask you to input your name

 

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|It then uses JavaBeans component to persist the name during the HTTP session,

 

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|and then retrieves the  output on a second JSP page.  

 

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| Let us now move to Netbeans and create our web application project

 

 

 

 

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|Under '''Projects,''' select '''Web Application''' , and click '''Next.'''

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|Give your project a name. I will name my project as '''HelloWeb'''

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|Specify the Project Location to any directory on your computer.  

 

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|And Select the server, you want to deploy your application to.

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|The Welcome page, '''index.jsp'' opens in the Source Editor in the main window.  

 

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| You can view the project's file structure in the Files window on the left here  

 

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|and it's logical structure in the Projects Window.  

 

 

 

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|Note that the Source Packages node contains only  an empty default package node.  

 

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|Give your class a name. I will name the class as '''NameHandler'''

 

 

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|and in the '''Package''' combobox let me type '''org.mypackage.hello'''

 

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|And Click '''Finish.'''  

 

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|The '''NameHandler.java''' file opens in the Source Editor.  

 

 

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|Now lets us declare a String variable directly below the class declaration

 

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|I will delare a string variable String name and

 

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|  I will also add a constructor '''public NameHandler''' to the class

 

 

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|Now let me also  add '''name = null;''' within the constructor.  

 

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|Let us next generate the '''Getter and Setter Methods'''  

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| Right-click the name field in the '''Source Editor''' choose '''Refactor'''  and  '''Encapsulate Fields ''' from the contextual menu

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|'''Refactoring''' is a disciplined technique for improving the structure of existing code without changing the observable behaviour.  

 

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|In short, you can change the structure of the code without changing the behaviour.  

 

 

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| With '''Refactoring,''' you can easily move fields, methods or classes around, without breaking things.  

 

 

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|Lets move back to the IDE.

 

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|  The '''Encapsulate Fields''' dialog opens, listing the name field.  

 

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| Notice that the '''Fields''' visibility is  set to private,

 

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|and '''Accessors''' visibility is set to '''public,''' by default  

 

 

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| Indicating that the access modifier for the class variables wil be specified as '''private''',

 

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| Whereas the '''getter''' and '''setter''' methods will be generated with '''public''' modifiers respectively.  

 

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|The '''Getter''' and '''Setter''' methods are generated for the '''name''' field.

 

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|The modifier for the class variable is set to '''private''' whereas the  '''getter''' and '''setter''' methods are generated with public modifier.  

 

 

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|Your java class should finally look like this  

 

 

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|Let us next Edit the '''Default JavaServer Pages File'''  

 

 

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|Now let us open the '''Palette manager''' by going to the '''Tools''' menu > '''Palette''' and click on '''HTML/JSP code clips'''

 

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|The '''Palatte manager''' opens.  

 

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|In the palette manager expand the '''HTML forms''' options

 

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| Drag it and drop it to the points after the h1 tags in your Source Editor

 

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|The '''Insert form''' dialog box opens .  

 

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|The '''Action''' as  '''response.jsp'''

 

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|And lets us give our form a name as '''Name input form.'''

 

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|Click OK.  

 

 

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|An HTML form is added to the '''index.jsp file.'''

 

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|Now from the Palette manager select a Text Input item drag it and drop it to a point just before the closing form tags  

 

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|In the '''Insert text input''' dialog box specify the '''Name''' as '''name'''

 

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|And Click on OK.  

 

 

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|A HTML input tag is now added between the form tags.  

 

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|Let us delete the empty value attribute from the input tag.  

 

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|Now from the palette select the '''Button''' item.

 

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|Drag it and drop it to the point before the closing form tag

 

 

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|Specify the '''Label''' as '''OK'''

 

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|The '''Type''' as '''submit'''

 

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|And Click on '''OK''' again

 

 

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|An HTML button is now added to a  form tags.  

 

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|Infront of the first '''input tag''' let us enter the text '''Enter your name'''

 

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|And let us  change the default text between the h1  tags  

 

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|We will change the text to '''Entry form'''

 

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|Right-click within your Source Editor  

 

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|Select the Format option to tidy the format of your code.  

 

 

 

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|Your '''index.jsp''' file should now look like this.

 

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|Let us next Create a JavaServer Pages File

 

 

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|In the Projects window, right-click on the '''HelloWeb''' project node, choose '''New > JSP. '''

 

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|The '''New JSP''' File wizard opens.  

 

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|Name the file as '''response,''' and click on '''Finish. '''

 

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|Notice that a '''response.jsp''' file node displays in the Projects window beneath the '''index.jsp file''' ,

 

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| And the new file opens in the Source Editor.  

 

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|Open the Palette manager again  

 

 

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|Now expand the JSP option.

 

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|Select a '''Use Bean''' item, drag it and drop it to a point just below the body

 

 

 

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|Specify the values as  

 

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|The '''ID''' as '''mybean'''  

 

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|The '''Class''' as '''org.mypackage.hello.NameHandler '''

 

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|And click on OK.  

 

 

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|Notice that a jsp:useBean tag is added beneath the body tag.  

 

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|JavaBeans are reusable software components for Java.  

 

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|They are used to encapsulate many objects into a single object  

 

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|So that they can be passed around as a single bean object instead of multiple individual objects.  

 

 

 

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|Now from the Palette manager, Select a setbean property item, drag it and drop it  to a point just before the h1 tags  

 

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|And click on OK.  

 

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|Here in the jsp:setProperty tag that appears, delete the empty value attribute.

 

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|And set the name attribute to '''mybean''' and the Property to '''name'''

 

 

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|Now in between the h1 tags let us change the text to '''Hello''' comma space and a '''exclamation mark'''

 

 

 

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|In the '''Get Bean Property''' item

 

 

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|Set the '''Bean Name''' to '''mybean'''

 

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|And the '''Property Name''' to '''name '''

 

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|Notice that '''jsp:getProperty''' tag is now added between the h1 tags.

 

 

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|Right-click within the Source Editor again, click on  '''Format''' to tidy the format of your code if required

 

 

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|In the Projects window, right-click the '''HelloWeb''' project node and choose the '''Run''' option

 

 

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|You can also click the '''Run''' option from the toolbar or press F6 key on your keyboard to run your Project.

 

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|I will select the button on the toolbar to run my Project

 

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|When you run a '''Web application''' the '''IDE''' builds and compiles the application code

 

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|Launches the server and deploys the application to the server

 

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|and finally displays the application in a browser window  

 

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|To view this process you can open the output window from the '''Window''' menu and select the '''Output''' option

 

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|You can see that your application has been  built successfully

 

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|The '''index.jsp''' page opens in your default browser  

 

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|Let me run the project again

 

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|Here it is, it opens in your default browser

 

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| Now let us Enter the name in the text box in the browser  

 

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| For eg '''Ubuntu''' and click on OK.  

 

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|The '''response.jsp''' page displays, providing you with a simple greeting.  

 

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|As an extension to the web application project, insert two more text fields that is totally three input text fields in your application

 

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|Use the JavaBeans Component to set the bean property and

 

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|View its presentation in the browser  

 

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|And finally Retrieve the output on the second JSP page  

 

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|I have already constructed my assignment

 

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|Let me open my assignment and run it in the ''' IDE'''  

 

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|I am presented with 3 input text fields

 

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|Let me enter the details and click on Ok

 

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|I should be presented with an output like this

 

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|Watch the video available at the link shown on the screen.  

 

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|The Spoken Tutorial project team conduct workshops using Spoken Tutorials.  

 

 

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|Gives certificates to those pass an online test.  

 

 

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|For more details please write to contact@spoken-tutorial.org

 

 

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|Spoken Tutorial Project is a part of the Talk to a Teacher Project

 

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|It is Supported by the National Mission on education through ICT, MHRD, Government  of India

 

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|More information on this mission is available at spoken-tutorial.org/NMEICT-Intro

 

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|This tutorial has been  contributed by  IT for Change  

 

 

| 15.43