Internet and Web Technology (CLASS-14) [JSP] | NIC/NIELIT Web Technology

Ayes Chinmay
Internet
&
Web Technology
(JSP)

IWT Syllabus:
Module 5:
Node.js
Introduction, Modules in nodejs, HTTP module, File System, URL module, NPM, events, Upload Files,
Email.
JSP
Server Side Programming: Introduction to Java Server Page (JSP), JSP Application Design, JSP objects,
Conditional Processing, Declaring variables and methods, Sharing data between JSP pages, Sharing
Session and Application Data, Database Programming using JDBC, development of java beans in JSP.
Servlet
Introduction to Servlets, Lifecycle, JSDK, Servlet API, Servlet Packages, Introduction to JSF, JSF Basics,
Managed Beans, Navigation, Standard JSF Tags, Data Tables, Conversion and Validation, Event Handling

JSP (Java Server Page):
• JSP is a server-side programming technology.
• Developed by Sun Microsystems in 1999.
• Fast way to create web pages to display dynamic data.
• JSP page contains both static & dynamic data.
• Helps to write web applications easily even with a less knowledge in Java.
• Extension of a JSP page is .jsp or .jspx
• Initially JSP was developed to replace servlet but now common practice is to
use servlet and JSP together using MVC (model-view-controller) pattern.

JSP Architecture:
Client’s
Computer
Server
1.Browser requests HTML
7. Server sends HTML
back to browser
servlet
servlet
class 5.The servlet
runs and
generates
HTML
Java Engine
6. Java Engine sends HTML toserver
2. Server sends requests to Java Engine
3. If needed, the Java Engine
reads the .jsp file
4. The JSP is turned intoa
servlet, compiled, and loaded
Bean JSP

JSP Life Cycle:
[destroy]
jspDestroy()
[Execution ]
_jspService()
[Intialization]
jspInit()
Request
Response

JSP Scripting Elements:
 There are three types of scripting elements in JSP,
o Scriptlet tag
o Expression tag
o Declaration tag

JSP Scriptlet tag:
 In JSP, JAVA code can be written inside the JSP page using
Scriptlet tag.
Syntax: <% java source code %>
Example:
<html>
<body>
<% out.print(“Hello world…”); %>
</body>
</html>

JSP Expression tag:
 Code placed within expression tag is written to the output stream of the
response. So, no need to write out.print() to write data.
Syntax: <%= Statement %>
Example:
<html>
<body>
<%= “Hello world!” %>
</body>
</html>
Note: Do not end statement with semicolon (;)

JSP Declaration tag:
 Used to declare fields and methods. The code written inside
this tag is placed outside the service() method of auto
generated servlet. So it doesn’t get memory at each request.
Syntax: <%! Statement %>
Example:
<html>
<body>
<%! int data=60; %>
<%= “Value is: “ + data %>
</body>
</html>

JSP Comments:
 There are two types of JSP comment types that we are using.
 Hidden Comments (JSP comments)
o Visible only inside JSP page but not in the generated HTML
page
o Example:
<%-- This is a hidden JSP comment --%>
 Comments within HTML content
o Comments to be generated inside the output HTML page
o Example:

JSP Directives:
• Directives are messages that tells the web container how to
translate a JSP page into corresponding servlet.
• Three types:
 page directive
 include directive
 taglib directive
• Syntax of JSP directives
<%@ directive attribute=“value” %>

JSP page directive:
• Defines attributes that apply to an entire JSP page.
• Syntax:
<%@ page attribute=“value” %>
• Attributes :
import, contentType, extends, info, buffer, language, autoFlush, session,
pageEncoding, errorPage, isErrorPage

JSP include directive:
• Includes the contents of any resource(may be jsp file, html
file or text file.
• It includes the original content of the included
resources at page translation time.
• Reusability is the advantage.
• Syntax:
<%@include file=“resourcename” %>

JSP taglib directive:
• Used to define a tag library that defines many tags.
• We use the TLD (Tag Library Descriptor) file to define the
tags.
• Syntax:
<%@ taglib uri=“uriofthetaglibrary”
prefix=“prefixoftaglibrary” %>

JSP implicit objects:
 There are several objects that are automatically available in JSP
called implicit objects.
Variable Type
out JspWriter
request HTTPServletRequest
response HTTPServletResponse
config ServletConfig
application ServletContext
session HTTPSession
pageContext PageContext
page Object
exception Throwable

JSP Scriptlet tag (Scripting elements):
<html>
<body>
<form action="welcome.jsp">
<input type="text" name="uname">
<input type="submit" value="go"><br/>
</form>
</body>
</html>
Index.html <html>
<body>
<%
String name=request.getParameter(
"uname");
out.print("welcome "+name);
%>
</body>
</html>
welcome.jsp
http://localhost:8080/

JSP Expression Tag:
<html>
<body>
<form action="welcome.jsp">
<br/>
<input type="submit" value="go">
</form>
</body>
</html>
Index.html
<html>
<body>
<%= "Welcome
"+request.getParameter("uname")
%>
</body>
</html>
welcome.jsp

JSP Declaration Tag:
<html>
<body>
<%! int data=50; %>
<%= "Value of the variable is:"+data %>
</body>
</html>
welcome.jsp

JSP Directives:
<html>
<body>
<%@ page import="java.util.Date" %>
Today is: <%= new Date() %>
</body>
</html>
Index.jsp

JSP request implicit object:
<form action="index1.jsp">
<input type="submit" value="go"><br/>
</form>
Index.html <%
String
name=request.getParameter("una
me");
out.print("welcome "+name);
%>
index1.jsp

Model Questions:
1. By which technology do we separate our business logic from
the presentation logic?
a) Servlet
b) JSP
c) Both (a) and (b)
d) None of the above (NIC 2016)
2. The correct syntax to write "Hi" in Javascript is
a) jscript.write("Hi");
b) document.write("Hi");
c) print("Hi");
d) jscript.print("Hi"); (ISRO 2015)

Model Questions: (Cont.)
3. XML document form a ______ structure ?
(a) Binary Tree
(b) Linked List
(c) Tree
(d) Graph
4. Which of the following provides a method to avoid
element name conflicts in XML ?
(a) Namespaces
(b) DTD
(c) CSS
(d) DOM
(JT 2018)
(JT 2018)

Internet and Web Technology (CLASS-14) [JSP] | NIC/NIELIT Web Technology

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