Java-Business-Application/C2/Servlet-Methods/English-timed

Time	Narration
00:01	Welcome to the spoken-tutorial on Servlet Methods.
00:06	In this tutorial, we will learn to:
00:08	* create a simple login form using JSP
00:13	* Pass parameters using doGet method
00:16	* Pass parameters using doPost method
00:20	* Difference between doGet and doPost methods.
00:25	Here we are using:
00:26	Ubuntu Version 12.04
00:30	Netbeans IDE 7.3
00:33	JDK 1.7
00:36	Firefox web-browser 21.0.
00:39	You can use any web-browser of your choice.
00:43	To follow this tutorial, you must know:
00:46	* Core Java using Netbeans IDE
00:49	* HTML
00:51	* Basics of Java Servlets and JSPs.
00:56	If not, for relevant tutorials, please visit our website.
01:00	We will begin by creating our web application- the Library Management System.
01:06	First, we will create the Home page.
01:09	The Home page will contain a simple login form.
01:14	It will allow authenticated users to login to the Library Management System.
01:20	Now, let us switch to Netbeans IDE.
01:23	Let us go to the index dot jsp page that we had already modified earlier.
01:30	I have modified this page to create our home page.
01:35	We keep the title as Home Page.
01:38	Inside the body, we have a table with border equal to 1.
01:44	You can have a look at the code here.
01:47	Inside the table, we have included a heading Welcome to Library Management System.
01:54	Next, we have paragraph tag that includes This is the home page for Library Management System.
02:03	Then we have a hyperlink which links to a page called visitorHomePage dot jsp.
02:11	We will create this page later.
02:13	Next, we have a very simple login form.
02:18	This form allows a registered user to login .
02:22	Before creating the form , you will have to create a servlet named GreetingServlet.
02:28	So pause the tutorial here and create a new servlet as explained in the earlier tutorial.
02:35	Note that the servlet name is GreetingServletand
02:39	the URL pattern should be GreetingServletPath.
02:44	This form has two input elements - Username and Password.
02:50	It also has a Submit button that says Sign In.
02:55	Next, we have a paragraph tag that includes a link to addUser.jsp.
03:03	This is the registration page for those users who have not yet registered.
03:09	Now, let us go to our GreetingServlet.java.
03:14	Note that GreetingServlet.java is created in the same package org.spokentutorial.
03:23	Now, this servlet will be able to access the form data from the request object.
03:30	This servlet will act as a controller.
03:33	Do you recall that we had come across controller earlier?
03:38	Now, we will see what the servlet does as a controller.
03:42	The form data will reside in the request object.
03:46	The first task is to retrieve the form data parameters.
03:51	This is done using the getParameter method on the request object.
03:57	So, let us switch to Netbeans IDE.
04:02	Type inside the doGet method:
04:04	PrintWriter space out equal to response dot getWriter().
04:14	Next, we will retrieve the form data parameters.
04:18	So that on the next line, type:
04:20	String space username equal to request dot getParameter within brackets and double quotes userName semicolon.
04:35	Note that this userName is the name we have included in the form tag for User Name.
04:43	Similarly, we will retrieve the password also.
04:48	So, on the next line, type: String space password equal to request dot getParameter within brackets and double quotes password semicolon.
05:03	Next, we will print the UserName in the output.
05:08	So, on the next line, type:
05:10	out dot println within brackets and double quotes Hello from GET Method plus username.
05:21	Now, to run this project, right-click on MyFirstProject.
05:27	Click on Clean and Build.
05:29	Again right click on MyFirstProject , click on Run.
05:35	So, the server is up and running.
05:38	It has deployed MyFirstProject.
05:41	We have got our Home page displayed in the browser.
05:45	Observe that the title of the page is Home Page.
05:50	We can see a very simple login form here.
05:54	Let me enter the Username and Password.
05:58	I will type arya as the Username.
06:02	And arya*123 as the Password.
06.06	Then click on Sign In.
06:09	We can see that we have got the output Hello from GET Method arya.
06:15	Now, the user was able to login here because we have not included any validation inside the code.
06:24	We will do this in the later tutorial.
06:28	Now, have a look at the URL here.
06:31	It is localhost colon 8080 slash MyFirstProject slash GreetingServletPath question mark userName equal to arya and password equal to arya *123.
06:49	Now, the form data is separated from the page information by a question mark.
06:56	We can see that the username and password that we had entered in the form are inside the URL also.
07:05	Now let us try to do the same, using POST Method.
07:10	So, switch back to the IDE.
07:12	Copy the code we had written for doGet Method and paste in the doPost Method.
07:20	Now, change the println statement to Hello from POST Method.
07:27	Now, let us open index dot jsp.
07:31	Here, we must change the method attribute of the form tag to POST.
07:37	You can have a look at this code now.
07:42	We have form action equal to GreetingServletPath method equal to POST.
07:49	Now, we will run this Project again.
07:53	So, right click on MyFirstProject and click on Run.
07:58	We have got the output similar to the one we got when we used the GET method.
08:04	So, let us type UserName and Password again.
08:08	Then click on Sign In.
08:12	Note that we have got Hello from POST Method arya.
08:17	Now, take a look at the URL.
08:19	It is localhost colon 8080 slash MyFirstProject slash GreetingServlet Path
08:25	Here we do not see the form data in the URL of the request.
08:30	This is the major difference between doGet and doPost methods.
08:35	Now, let us learn when to use GET and when to use POST methods.
08:42	GET method is used when:
08:44	* the form is small and hence the data is less.
08:48	* the user wants the contents of the data to be visible in the URL.
08:53	POST method is used when:
08:55	* the form is large and hence the data is more.
09:00	* the user does not want the contents of the data to be visible in the URL.
09:06	ex: passwords
09:08	Let us summarize.
09:10	In this tutorial we have learnt to:
09:12	* create a simple login form using JSP
09:16	* Pass parameters using doGet method
09:19	* Pass parameters using doPost method
09:22	* Difference between doGet and doPost methods.
09:26	Please make sure that you have completed this tutorial before proceeding further.
09:32	Watch the video available at the following link.
09:35	It summarizes the Spoken Tutorial Project.
09:38	If you do not have good bandwidth, you can download and watch it.
09:42	The Spoken Tutorial Project Team:
09:45	Conducts workshops using spoken tutorials.
09:48	Gives certificates for those who pass an online test.
09:52	For more details please write to: contact at spoken hyphen tutorial dot org.
09:58	Spoken Tutorial Project is a part of the "Talk to a Teacher" Project.
10:02	It is supported by the National Mission on Education through ICT, MHRD, Government of India.
10:09	More information on this mission is available at http://spoken-tutorial.org/NMEICT-Intro
10:19	The Library Management System has been contributed by a leading software MNC through their "Corporate Social Responsibility Programme".
10:28	They have also validated the content for this spoken tutorial.
10:32	This is Arya Ratish from IIT Bombay, signing off. Thank you for joining.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14