Difference between revisions of "Java-Business-Application/C2/Java-servlets-and-JSPs/English-timed"

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|  In this tutorial we will learn about:
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|  In this tutorial, we will learn about:
  
 
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|-
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|  ''' Web container'''
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|  ''' Web container'''.
  
 
|-
 
|-
 
|  00:12
 
|  00:12
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| We will also learn to create a simple '''Java Servlet ''' and '''JSP'''
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| We will also learn to create a simple '''Java Servlet ''' and '''JSP'''.
  
 
|-
 
|-
 
| 00:18
 
| 00:18
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|Here we are using
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|Here we are using:
  
 
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|-
 
|-
 
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|  '''Firefox''' web-browser 21.0
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|  '''Firefox''' web-browser 21.0.
  
 
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|-
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|-
 
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|00:37
 
|00:37
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| To follow this tutorial you must have knowledge of
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| To follow this tutorial, you must have knowledge of
  
 
|-
 
|-
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|  00:45
 
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|  '''HTML'''
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|  '''HTML'''.
  
 
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|-
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|-
 
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| 01:10
 
| 01:10
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| A '''web container''' is a component of the web server that interacts with '''Java servlets'''
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| A '''web container''' is a component of the web server that interacts with '''Java servlets'''.
  
 
|-
 
|-
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|  Type the '''Package Name '''as '''org.spokentutorial'''
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|  Type the '''Package Name '''as '''org.spokentutorial'''.
  
 
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|-
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|We can override these methods.
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|We can '''override''' these methods.
  
 
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|-
 
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|  04:25
 
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|  So we are left with two methods '''doGet''' and '''doPost.'''
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|  So, we are left with two methods '''doGet''' and '''doPost.'''
  
 
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|So,remove the method call for '''processRequest method.'''
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|So, remove the method call for '''processRequest method.'''
  
 
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|  Also notice that, '''request '''is of type '''HttpServletRequest.'''
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|  Also notice that '''request '''is of type '''HttpServletRequest.'''
  
 
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|  05:40
 
|  05:40
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|  So, inside the '''doGet method''' type '''PrintWriter''' space '''writer''' equal to '''response'''dot '''getWriter''' open and close brackets '''semicolon'''
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|  So, inside the '''doGet method''' type: '''PrintWriter''' space '''writer''' equal to '''response'''dot '''getWriter''' open and close brackets '''semicolon'''
  
 
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|  05:59
 
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|  On the next line type -
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|  On the next line type:
  
 
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|  06:02
 
|  06:02
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|'''writer ''dot ''println ''within brackets and double quotes ''welcome.'''
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|'''writer '''dot '''println '''within brackets and double quotes '''welcome.'''
  
 
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|06:09
 
|06:09
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|  Then, Press '''Ctrl S''' to save the file.
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|  Then, Press '''Ctrl S''' to '''save''' the file.
  
 
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|  06:14
 
|  06:14
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|  Now, let us run the '''servlet.'''
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|  Now, let us '''run''' the '''servlet.'''
  
 
|-
 
|-
 
|  06:17
 
|  06:17
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|  So on the left hand side, in the '''Projects tab '''right click on '''MyServlet''' ''' dot''' ''java'''.
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|  So, on the left hand side, in the '''Projects tab '''right click on '''MyServlet''' ''' dot''' ''java'''.
  
 
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|  Then, Click on '''Run File.'''
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|  Then, click on '''Run File.'''
  
 
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|  Here '''MyFirstProject '''is the '''context name '''and '''MyServletPath '''is the '''URL Pattern''' that we had set.
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|  Here, '''MyFirstProject '''is the '''context name '''and '''MyServletPath '''is the '''URL Pattern''' that we had set.
  
 
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|  In the '''println''' method we can pass '''html''' code.
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|  In the '''println''' method, we can pass '''html''' code.
  
 
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|  Since we deployed this servlet earlier, we need not run it again.  
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|  Since we deployed this servlet earlier, we need not '''run''' it again.  
  
 
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|  Notice that, we have '''HTML''' code inside the '''Java code.'''
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|  Notice that we have '''HTML''' code inside the '''Java code.'''
  
 
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| '''Servlets '''act as the '''controller '''and '''JSPs '''act as the '''view '''
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| '''Servlets '''act as the '''controller '''and '''JSPs '''act as the '''view '''.
  
 
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| So, Right click on '''MyFirstProject'''.  
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| So, right click on '''MyFirstProject'''.  
  
 
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|  Go to '''New.'''
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|  Go to '''New'''
  
 
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|  Click on the '''Projects tab '''on the left hand side  
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|  Click on the '''Projects tab '''. On the left hand side,
  
 
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|  Now, In the editor, change '''Hello World''' to '''Welcome'''.
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|  Now, in the editor, change '''Hello World''' to '''Welcome'''.
  
 
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|  In the url after '''MyFirstProject''' '''slash'''type '''welcome.jsp'''
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|  In the url, after '''MyFirstProject''' '''slash'''type '''welcome.jsp'''
  
 
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|  Let us summarize
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|  Let us summarize.
  
 
|-
 
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| 09:44
 
| 09:44
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|In this tutorial we have learnt
+
|In this tutorial, we have learnt:
  
 
|-
 
|-
 
| 09:47
 
| 09:47
−
| About '''web server''' and '''web container'''
+
|* About '''web server''' and '''web container'''
  
 
|-
 
|-
 
| 09:49
 
| 09:49
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| To create a '''simple servlet'''
+
|* To create a '''simple servlet'''
  
 
|-
 
|-
 
| 09:52
 
| 09:52
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| To create a '''simple JSP'''
+
|* To create a '''simple JSP'''.
  
 
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| 10:01
 
| 10:01
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| Watch the video available at the following link
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| Watch the video available at the following link.
  
 
|-
 
|-
 
| 10:04
 
| 10:04
−
| It summarizes the Spoken Tutorial project
+
| It summarizes the Spoken Tutorial project.
  
 
|-
 
|-
 
| 10:08
 
| 10:08
−
| If you do not have good bandwidth, you can download and watch it
+
| If you do not have good bandwidth, you can download and watch it.
  
 
|-
 
|-
 
|10:13
 
|10:13
−
|  The Spoken Tutorial Project Team
+
|  The Spoken Tutorial Project Team:
  
 
|-
 
|-
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|-
 
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| 10:19
 
| 10:19
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| Gives certificates for those who pass an online test
+
| Gives certificates for those who pass an online test.
  
 
|-
 
|-
 
| 10:22
 
| 10:22
−
| For more details, please write to contact at spoken hyphen tutorial dot org
+
| For more details, please write to: contact at spoken hyphen tutorial dot org.
  
 
|-
 
|-
 
| 10:28
 
| 10:28
−
|  Spoken Tutorial Project is a part of the Talk to a Teacher project
+
|  Spoken Tutorial Project is a part of the "Talk to a Teacher project".
  
 
|-
 
|-
 
| 10:32
 
| 10:32
−
| It is supported by the National Mission on Education through ICT, MHRD, Government of India
+
| It is supported by the National Mission on Education through ICT, MHRD, Government of India.
  
 
|-
 
|-
 
| 10:40
 
| 10:40
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| More information on this Mission is available at  http://spoken-tutorial.org/NMEICT- Intro
+
| More information on this mission is available at  http://spoken-tutorial.org/NMEICT- Intro
  
 
|-
 
|-
 
| 10:50
 
| 10:50
−
|  The '''Library Management System''' has been contributed by a leading '''software MNC''', through their Corporate Social Responsibility program
+
|  The '''Library Management System''' has been contributed by a leading '''software MNC''', through their Corporate Social Responsibility program.
  
 
|-
 
|-
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| 11:04
 
| 11:04
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|This is Arya Ratish from IIT Bombay signing off.
+
|This is Arya Ratish from IIT Bombay, signing off.
 
Thank you for joining.
 
Thank you for joining.
  
 
|}
 
|}

Revision as of 21:33, 13 June 2015

Time Narration
00:01 Welcome to the spoken-tutorial on Java Servlets and JSPs.
00:06 In this tutorial, we will learn about:
00:09 Web server
00:10 Web container.
00:12 We will also learn to create a simple Java Servlet and JSP.
00:18 Here we are using:
00:20 Ubuntu Version12.04
00:23 Netbeans IDE 7.3
00:27 JDK 1.7
00:29 Firefox web-browser 21.0.
00:33 You can use any web-browser of your choice.
00:37 To follow this tutorial, you must have knowledge of
00:41 Core Java using Netbeans IDE and
00:45 HTML.
00:47 If not, for relevant tutorials please visit our website.
00:52 Before moving onto Servlets and JSP, let us first understand a web server.
00:58 A web server is a system that delivers content to end-users over the Internet.
01:05 It is also known as Internet server.
01:10 A web container is a component of the web server that interacts with Java servlets.
01:18 It is also known as servlet container.
01:22 The servlet container allows the servlets to execute inside it.
01:28 Now, let us learn how to write a simple servlet.
01:32 Switch to the Netbeans IDE.
01:35 Click on the Project tab on the left hand side of the IDE.
01:40 Earlier we had created a simple Project named MyFirstProject.
01:46 You can see it here on the left hand side of the IDE.
01:50 Let us now create a simple servlet inside this project.
01:55 So, right-click on MyFirstProject.
01:59 Go to New and click on Servlet.
02:03 A New Servlet window opens.
02:05 Type the Class Name as MyServlet.
02:09 Type the Package Name as org.spokentutorial.
02:16 Then click on Next.
02:18 Click on Add information to deployment descriptor (web.xml).
02:23 We can see that the Class Name is org.spokentutorial.MyServlet.
02:30 We can see that Servlet Name is same as that of the Class Name which is MyServlet.
02:37 Note that the URL pattern is the same name as that of the Class Name. i.e MyServlet
02:45 We can change it to MyServletPath.
02:50 Then click on Finish.
02:53 The source code created by the IDE for MyServlet.java is seen in the Source Editor Window.
03:01 We see MyServlet.java is created in the package org.spokentutorial.
03:09 Notice that a servlet is just like any other Java class.
03:14 Except that a servlet does not have a main method.
03:19 Now, let us learn something about Glassfish server.
03:24 A servlet is deployed in a servlet container.
03:28 We are using Glassfish as our server.
03:32 Servlet container is a component of Glassfish that interacts with servlets.
03:39 Now, let us come back to Netbeans IDE.
03:42 Note that MyServlet extends the HttpServlet.
03:48 At the bottom of the code, we can see HttpServlet methods.
03:54 Click on the plus sign on the left, to view these methods.
03:59 We see the methods - doGet, doPost and getServletInfo methods.
04:09 We can override these methods.
04:12 We can see that there is one more method named processRequest at the top.
04:18 We will delete processRequest and getServletInfo methods to avoid confusion.
04:25 So, we are left with two methods doGet and doPost.
04:31 For now, we will look at the doGet method.
04:35 doGetis the default method for any simple URLrequest.
04:41 So we will type some code inside the doGet method.
04:45 We had already deleted processRequest method.
04:49 So, remove the method call for processRequest method.
04:54 Also remove it from the doPost method.
04:58 Now, let us come to the doGet method
05:01 We can see that there are two parameters that are passed to the doGet method.
05:07 One is the request and the other is the response object.
05:12 Also notice that request is of type HttpServletRequest.
05:18 And response object is of type HttpServletResponse.
05:22 We will use the response object to send the HTML response back to the client side.
05:30 For that, we will have to create a PrintWriter object.
05:35 Notice that the PrintWriter class is already imported.
05:40 So, inside the doGet method type: PrintWriter space writer equal to responsedot getWriter open and close brackets semicolon
05:57 Press Enter.
05:59 On the next line type:
06:02 writer dot println within brackets and double quotes welcome.
06:09 Then, Press Ctrl S to save the file.
06:14 Now, let us run the servlet.
06:17 So, on the left hand side, in the Projects tab right click on MyServlet' dot java.
06:24 Then, click on Run File.
06:27 We get a Set Servlet Execution URI dialog box.
06:32 Click on OK.
06:35 When the browser window opens, look at the URL.
06:39 It is localhost colon 8080 slash MyFirstProject slash MyServletPath.
06:47 Here, MyFirstProject is the context name and MyServletPath is the URL Pattern that we had set.
06:55 We see the text welcome printed on the browser.
07:00 Now go back to the Netbeans IDE.
07:03 In the println method, we can pass html code.
07:07 For example, put welcome in h3 tag.
07:12 Now,Save the file.
07:14 Since we deployed this servlet earlier, we need not run it again.
07:20 The web container automatically detects it.
07:23 So, we can go back to the browser.
07:27 Refresh.
07:28 We see the message Welcome in a different format.
07:32 Now, come back to the IDE.
07:35 Thus, we have successfully created a servlet.
07:39 We can create any web application using servlets.
07:45 We used the servlet to display an HTML code.
07:49 Notice that we have HTML code inside the Java code.
07:54 Even though this is possible, it is difficult to do for large web applications.
08:00 And hence not a recommended practice.
08:03 It would be better to replace this using JSP (Java Server Pages.)
08:10 We will see the use of servlets and JSPs.
08:13 Servlets and JSPs are used together to separate presentation from content.
08:20 Servlets act as the controller and JSPs act as the view .
08:25 Servlets contain HTML code inside Java code.
08:30 JSPs contain Java code inside HTML code.
08:35 We will learn more about these in the coming tutorials.
08:39 Now, Switch back to Netbeans IDE.
08:42 We will now create a simple JSP page.
08:47 So, right click on MyFirstProject.
08:50 Go to New
08:51 and click on JSP.
08:54 A new JSP window opens.
08:57 Type the Filename as welcome .
09:01 And then click on Finish.
09:04 Click on the Projects tab . On the left hand side,
09:07 We can see that Welcome.jsp is under Web Pages folder.
09:13 Now, in the editor, change Hello World to Welcome.
09:19 Notice that Welcome is within h1 tags.
09:23 Now, Save the file.
09:25 Come back to the browser.
09:27 In the url, after MyFirstProject slashtype welcome.jsp
09:35 We see the output Welcome.
09:38 Therefore for presentation purpose JSP is preferred.
09:42 Let us summarize.
09:44 In this tutorial, we have learnt:
09:47 * About web server and web container
09:49 * To create a simple servlet
09:52 * To create a simple JSP.
09:55 Please make sure that you have completed this tutorial before proceeding further.
10:01 Watch the video available at the following link.
10:04 It summarizes the Spoken Tutorial project.
10:08 If you do not have good bandwidth, you can download and watch it.
10:13 The Spoken Tutorial Project Team:
10:15 Conducts workshops using spoken tutorials
10:19 Gives certificates for those who pass an online test.
10:22 For more details, please write to: contact at spoken hyphen tutorial dot org.
10:28 Spoken Tutorial Project is a part of the "Talk to a Teacher project".
10:32 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
10:40 More information on this mission is available at http://spoken-tutorial.org/NMEICT- Intro
10:50 The Library Management System has been contributed by a leading software MNC, through their Corporate Social Responsibility program.
11:00 They have also validated the content for this spoken tutorial.
11:04 This is Arya Ratish from IIT Bombay, signing off.

Thank you for joining.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14

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