Difference between revisions of "Java-Business-Application/C2/Servlet-Methods/English-timed"
From Script | Spoken-Tutorial
PoojaMoolya (Talk | contribs) |
|||
(10 intermediate revisions by 2 users not shown) | |||
Line 5: | Line 5: | ||
|- | |- | ||
| 00:01 | | 00:01 | ||
− | | Welcome to the spoken-tutorial on '''Servlet Methods.''' | + | | Welcome to the '''spoken-tutorial''' on '''Servlet Methods.''' |
|- | |- | ||
|00:06 | |00:06 | ||
− | | In this tutorial we will learn to | + | | In this tutorial, we will learn to: |
|- | |- | ||
− | | 00:08 | + | |00:08 |
− | | create a ''' | + | |create a simple '''login form''' using '''JSP''' |
|- | |- | ||
− | | 00:13 | + | |00:13 |
− | | Pass parameters using '''doGet''' '''method''' | + | |Pass parameters using '''doGet''' '''method''' |
|- | |- | ||
− | | 00:16 | + | |00:16 |
− | | Pass parameters using '''doPost method''' | + | |Pass parameters using '''doPost method''' |
|- | |- | ||
− | | 00:20 | + | |00:20 |
− | | Difference between '''doGet '''and '''doPost''' methods | + | |Difference between '''doGet '''and '''doPost''' methods. |
|- | |- | ||
|00:25 | |00:25 | ||
− | |Here we are using | + | |Here we are using:'''Ubuntu '''Version '''12.04''' |
− | + | ||
− | + | ||
− | + | ||
− | + | ||
|- | |- | ||
Line 45: | Line 41: | ||
|- | |- | ||
| 00:36 | | 00:36 | ||
− | | '''Firefox''' web-browser 21.0 | + | | '''Firefox''' web-browser 21.0. |
|- | |- | ||
Line 53: | Line 49: | ||
|- | |- | ||
| 00:43 | | 00:43 | ||
− | | To follow this tutorial you must know | + | | To follow this tutorial, you must know: |
|- | |- | ||
| 00:46 | | 00:46 | ||
− | | Core Java using '''Netbeans IDE''' | + | |Core Java using '''Netbeans IDE''' |
|- | |- | ||
− | | 00:49 | + | |00:49 |
− | | '''HTML''' | + | |'''HTML''' |
|- | |- | ||
− | | 00:51 | + | |00:51 |
− | | Basics of '''Java Servlets '''and '''JSPs''' | + | |Basics of '''Java Servlets '''and '''JSPs'''. |
|- | |- | ||
| 00:56 | | 00:56 | ||
− | |If not, for relevant tutorials please visit our website. | + | |If not, for relevant tutorials, please visit our website. |
|- | |- | ||
Line 77: | Line 73: | ||
|- | |- | ||
| 01:06 | | 01:06 | ||
− | |First, we will create the ''' | + | |First, we will create the '''Home page.''' |
|- | |- | ||
| 01:09 | | 01:09 | ||
− | |The ''' | + | |The '''Home page''' will contain a simple '''login form'''. |
|- | |- | ||
| 01:14 | | 01:14 | ||
− | |It will allow authenticated users to login to the '''Library Management System.''' | + | |It will allow authenticated users to '''login''' to the '''Library Management System.''' |
|- | |- | ||
Line 93: | Line 89: | ||
|- | |- | ||
| 01:23 | | 01:23 | ||
− | | Let us go to the '''index ''' '''dot''' '''jsp''' page | + | | Let us go to the '''index ''' '''dot''' '''jsp''' page that we had already modified earlier. |
|- | |- | ||
Line 105: | Line 101: | ||
|- | |- | ||
| 01:38 | | 01:38 | ||
− | | Inside the body, we have a '''table | + | | Inside the body, we have a '''table''' with '''border''' equal to '''1.''' |
|- | |- | ||
Line 113: | Line 109: | ||
|- | |- | ||
| 01:47 | | 01:47 | ||
− | | Inside the '''table''' we have included a heading | + | | Inside the '''table''', we have included a heading '''Welcome to Library Management System.''' |
|- | |- | ||
| 01:54 | | 01:54 | ||
− | | Next, we have '''paragraph tag''' that includes | + | | Next, we have a '''paragraph tag''' that includes ''' "This is the home page for Library Management System".''' |
|- | |- | ||
| 02:03 | | 02:03 | ||
− | | Then | + | | Then we have a '''hyperlink''' which links to a '''page''' called '''visitorHomePage dot jsp.''' |
|- | |- | ||
Line 129: | Line 125: | ||
|- | |- | ||
| 02:13 | | 02:13 | ||
− | | Next,we have a very simple '''login form.''' | + | | Next, we have a very simple '''login form.''' |
|- | |- | ||
Line 137: | Line 133: | ||
|- | |- | ||
| 02:22 | | 02:22 | ||
− | | Before creating the '''form ''' you will have to create a '''servlet '''named '''GreetingServlet.''' | + | | Before creating the '''form ''', you will have to create a '''servlet '''named '''GreetingServlet.''' |
|- | |- | ||
| 02:28 | | 02:28 | ||
− | | | + | | So, pause the tutorial here and create a new '''servlet''' as explained in the earlier tutorial. |
|- | |- | ||
| 02:35 | | 02:35 | ||
− | | Note that the '''servlet | + | | Note that the '''servlet''' name is '''GreetingServlet'''and |
|- | |- | ||
| 02:39 | | 02:39 | ||
− | | | + | |the '''URL pattern''' should be '''GreetingServletPath.''' |
|- | |- | ||
| 02:44 | | 02:44 | ||
− | | This''' form''' has two input elements - '''Username and Password.''' | + | | This''' form''' has two '''input elements''' - '''Username''' and '''Password.''' |
|- | |- | ||
Line 161: | Line 157: | ||
|- | |- | ||
| 02:55 | | 02:55 | ||
− | | Next, we have a '''paragraph tag''' that includes a link to '''addUser.jsp.''' | + | | Next, we have a '''paragraph tag''' that includes a '''link''' to '''addUser.jsp.''' |
|- | |- | ||
Line 197: | Line 193: | ||
|- | |- | ||
| 03:46 | | 03:46 | ||
− | |The first task is to retrieve the '''form''' data parameters. | + | |The first task is to retrieve the '''form''' '''data''' parameters. |
|- | |- | ||
Line 209: | Line 205: | ||
|- | |- | ||
| 04:02 | | 04:02 | ||
− | | Type inside the''' doGet method | + | | Type inside the''' doGet method''': |
|- | |- | ||
| 04:04 | | 04:04 | ||
− | |'''PrintWriter space out equal to response dot getWriter.''' | + | |'''PrintWriter space out equal to response dot getWriter().''' |
|- | |- | ||
| 04:14 | | 04:14 | ||
− | | Next, we will retrieve the '''form data '''parameters. | + | | Next, we will retrieve the '''form data''' '''parameters'''. |
|- | |- | ||
| 04:18 | | 04:18 | ||
− | | So that on the next line | + | | So that on the next line, type: |
|- | |- | ||
| 04:20 | | 04:20 | ||
− | | '''String''' space '''username''' equal to '''request''' dot '''getParameter ''' within brackets and double quotes '''userName''' '''semicolon'''. | + | | '''String''' space '''username''' equal to '''request''' dot '''getParameter ''' within brackets and double quotes '''userName''' and '''semicolon'''. |
|- | |- | ||
Line 233: | Line 229: | ||
|- | |- | ||
| 04:43 | | 04:43 | ||
− | | Similarly, we will retrieve the | + | | Similarly, we will retrieve the password also. |
|- | |- | ||
| 04:48 | | 04:48 | ||
− | |So on the next line, type | + | |So, on the next line, type: '''String ''' space '''password''' equal to '''request''' dot '''getParameter ''' within brackets and double quotes '''password''' semicolon. |
|- | |- | ||
| 05:03 | | 05:03 | ||
− | | Next, we will print the ''' | + | | Next, we will print the '''UserName '''in the '''output'''. |
|- | |- | ||
| 05:08 | | 05:08 | ||
− | | So, on the next line type | + | | So, on the next line, type: |
|- | |- | ||
| 05:10 | | 05:10 | ||
− | |'''out ''dot '''println''' within brackets and double quotes ''' Hello from GET Method plus username.''' | + | |'''out''' dot '''println''' within brackets and double quotes ''' Hello from GET Method''' plus '''username.''' |
|- | |- | ||
|05:21 | |05:21 | ||
− | | Now, to run this project, right-click on '''MyFirstProject. ''' | + | | Now, to '''run''' this '''project''', right-click on '''MyFirstProject. ''' |
|- | |- | ||
Line 261: | Line 257: | ||
|- | |- | ||
| 05:29 | | 05:29 | ||
− | | Again right click on '''MyFirstProject ''', click on '''Run.''' | + | | Again right-click on '''MyFirstProject ''', click on '''Run.''' |
|- | |- | ||
Line 273: | Line 269: | ||
|- | |- | ||
| 05:41 | | 05:41 | ||
− | |We have got our ''' | + | |We have got our '''Home page '''displayed in the '''browser'''. |
|- | |- | ||
| 05:45 | | 05:45 | ||
− | | Observe that the ''' | + | | Observe that the title of the '''page''' is '''Home Page.''' |
|- | |- | ||
Line 296: | Line 292: | ||
|- | |- | ||
− | |06 | + | |06:06 |
| Then click on '''Sign In.''' | | Then click on '''Sign In.''' | ||
Line 305: | Line 301: | ||
|- | |- | ||
| 06:15 | | 06:15 | ||
− | | Now, the '''user '''was able to login here because we have not included any validation inside the code. | + | | Now, the '''user '''was able to '''login''' here because we have not included any validation inside the code. |
|- | |- | ||
Line 317: | Line 313: | ||
|- | |- | ||
| 06:31 | | 06:31 | ||
− | |It is '''localhost | + | |It is '''localhost ''' colon '''8080 ''' slash '''MyFirstProject ''' slash '''GreetingServletPath ''' question mark '''userName ''' equal to '''arya''' and '''password ''' equal to '''arya *123'''. |
|- | |- | ||
| 06:49 | | 06:49 | ||
− | |Now, '''form data '''is separated from the page | + | |Now, the '''form data '''is separated from the '''page''' information by a question mark. |
|- | |- | ||
|06:56 | |06:56 | ||
− | | We can see that '''username '''and '''password '''that we had entered in the form | + | | We can see that the '''username '''and '''password '''that we had entered in the '''form''' are inside the URL also. |
|- | |- | ||
| 07:05 | | 07:05 | ||
− | | Now | + | | Now let us try to do the same, using '''POST Method.''' |
|- | |- | ||
Line 337: | Line 333: | ||
|- | |- | ||
| 07:12 | | 07:12 | ||
− | | Copy the code we had written for '''doGet | + | | Copy the code we had written for '''doGet method '''and paste in the '''doPost method.''' |
|- | |- | ||
Line 345: | Line 341: | ||
|- | |- | ||
|07:27 | |07:27 | ||
− | | Now, let us open '''index | + | | Now, let us open '''index dot jsp.''' |
|- | |- | ||
| 07:31 | | 07:31 | ||
− | | Here, we must change the '''method attribute '''of the '''form tag '''to '''POST.''' | + | | Here, we must change the '''method attribute''' of the '''form tag '''to '''POST.''' |
|- | |- | ||
Line 357: | Line 353: | ||
|- | |- | ||
| 07:42 | | 07:42 | ||
− | |We have '''form action | + | |We have '''form action ''' equal to '''GreetingServletPath''' '''method ''' equal to '''POST.''' |
|- | |- | ||
| 07:49 | | 07:49 | ||
− | | Now, we will run this Project again | + | | Now, we will '''run''' this '''Project''' again. |
|- | |- | ||
| 07:53 | | 07:53 | ||
− | | So, | + | | So, right-click on '''MyFirstProject '''and click on '''Run'''. |
|- | |- | ||
| 07:58 | | 07:58 | ||
− | | We have got | + | | We have got the output similar to the one we got when we used the '''GET method.''' |
|- | |- | ||
| 08:04 | | 08:04 | ||
− | | So let us type ''' | + | | So, let us type '''UserName '''and '''Password '''again. |
|- | |- | ||
Line 389: | Line 385: | ||
|- | |- | ||
| 08:19 | | 08:19 | ||
− | |It is '''localhost colon 8080 slash MyFirstProject slash GreetingServlet Path ''' | + | |It is '''localhost colon 8080 slash MyFirstProject slash GreetingServlet Path'''. |
|- | |- | ||
| 08:25 | | 08:25 | ||
− | | Here we do not see the '''form data '''in the '''URL '''of the '''request.''' | + | | Here, we do not see the '''form data '''in the '''URL '''of the '''request.''' |
|- | |- | ||
| 08:30 | | 08:30 | ||
− | | This is the major difference between '''doGet '''and '''doPost | + | | This is the major difference between '''doGet '''and '''doPost methods.''' |
|- | |- | ||
| 08:35 | | 08:35 | ||
− | | Now, let us learn when to use '''GET '''and when to use '''POST | + | | Now, let us learn when to use '''GET '''and when to use '''POST methods.''' |
|- | |- | ||
| 08:42 | | 08:42 | ||
− | |'''GET | + | |'''GET method '''is used when: |
|- | |- | ||
| 08:44 | | 08:44 | ||
− | | the '''form '''is small and hence the '''data '''is less. | + | |the '''form '''is small and hence the '''data '''is less. |
|- | |- | ||
| 08:48 | | 08:48 | ||
− | | the '''user''' wants the contents of the data to be visible in the '''URL.''' | + | |the '''user''' wants the contents of the data to be visible in the '''URL.''' |
|- | |- | ||
| 08:53 | | 08:53 | ||
− | |'''POST | + | |'''POST method '''is used when: |
|- | |- | ||
| 08:55 | | 08:55 | ||
− | | the '''form '''is large and hence the '''data '''is more. | + | |the '''form '''is large and hence the '''data '''is more. |
|- | |- | ||
| 09:00 | | 09:00 | ||
− | | the '''user''' does not want the contents of the data to be visible in the '''URL.''' | + | |the '''user''' does not want the contents of the data to be visible in the '''URL.''' |
|- | |- | ||
Line 441: | Line 437: | ||
|- | |- | ||
| 09:12 | | 09:12 | ||
− | | create a simple login form using '''JSP''' | + | |create a '''simple login form''' using '''JSP''' |
|- | |- | ||
| 09:16 | | 09:16 | ||
− | | Pass parameters using '''doGet''' '''method''' | + | |Pass parameters using '''doGet''' '''method''' |
|- | |- | ||
| 09:19 | | 09:19 | ||
− | | Pass parameters using '''doPost method''' | + | |Pass parameters using '''doPost method''' |
|- | |- | ||
| 09:22 | | 09:22 | ||
− | | Difference between''' doGet '''and '''doPost''' methods | + | |Difference between''' doGet '''and '''doPost''' methods. |
|- | |- | ||
Line 465: | Line 461: | ||
|- | |- | ||
| 09:35 | | 09:35 | ||
− | | It summarizes the Spoken Tutorial Project | + | | It summarizes the Spoken Tutorial Project. |
|- | |- | ||
| 09:38 | | 09:38 | ||
− | |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. |
|- | |- | ||
|09:42 | |09:42 | ||
− | | The Spoken Tutorial Project Team | + | | The Spoken Tutorial Project Team: |
|- | |- | ||
| 09:45 | | 09:45 | ||
− | | Conducts workshops using spoken tutorials | + | | Conducts workshops using spoken tutorials. |
|- | |- | ||
| 09:48 | | 09:48 | ||
− | | Gives certificates for those who pass an online test | + | | Gives certificates for those who pass an online test. |
|- | |- | ||
| 09:52 | | 09:52 | ||
− | | 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. |
|- | |- | ||
| 09:58 | | 09:58 | ||
− | | 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. |
|- | |- | ||
| 10:02 | | 10:02 | ||
− | | 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. |
|- | |- | ||
| 10:09 | | 10:09 | ||
Line 500: | Line 496: | ||
|- | |- | ||
| 10:19 | | 10:19 | ||
− | | The Library Management System has been contributed by a leading software MNC | + | | The '''Library Management System''' has been contributed by a leading software MNC through their "Corporate Social Responsibility Programme". |
|- | |- | ||
Line 508: | Line 504: | ||
|- | |- | ||
| 10:32 | | 10:32 | ||
− | |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. | + | |
|} | |} |
Latest revision as of 16:50, 9 March 2017
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: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 a 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 and 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. |