JSP FUNDAMENTALS
JSP FUNDAMENTALS
By: Hrishikesh Deshpande
Introduction :
JSP termed as Java Server Pages is a technology introduced by Sun Microsystems Inc. to develop the web application in more efficient way than Servlets. It has got many
Tutorial Details:
advanced features than servlets, one of them itself define the JSP i.e. JSP separates the presentation logic from the business logic and provide the designer and developer of the web application to work independently without any hassle.
Lets start with the basic of the JSPs, JSP is flavour of Cold fusion and ASP and hence provide the flexibility to embed the business logic efficiently within the HTML content (presentation logic).
JSP page is built using components such as :
Directives
Declarations
Scriplets
Expressions
Standard Actions
Custom Tags
Directives :
Listing some of them to start off :
1) Page
Syntax : < %@ page Language=?Java? extends=?? import=? or ? %>
Attributes:
a. Language = ?Java?
b. Import = ?Class?
c. Buffersize = ??
d. Scope = ?REQUEST/PAGE/SESSION/APPLICATION?
e. And etc?.
Page directive is aimed to define certain attribute of a JSP page for e.g. Language of the page in which the page content should be written , which class to be imported so that it can be used within the JSP page.
2) Include
Syntax: <%@ include file=?? %>
Attributes:
a. file = ??
This directive is to include the a HTML, JSP or Sevlet file into a JSP file. This is a static inclusion of file i.e. it will be included into the JSP file at the time of compilation and once the JSP file is compiled any changes in the included the file will not the reflected.
Declarations:
Syntax: <%! Declare all the variables here %>
Scriplets:
Syntax: <% All your scripts will come here %>
Expressions:
Syntax: <%= expression evaluation and display the variable %>
Standard Action:
Syntax:
Include ? />
This inclusion of file is dynamic and the specified file is included in the JSP file at run-time i.e. out put of the included file is inserted into the JSP file.
Forward ? />
This will redirect to the different page without notifying browser.
And many more.
Custom Tags:
taglib
Syntax: <%@ taglib uri=?? prefix=?? %>
Attributes:
a. uri = ??
b. prefix = ??
prefix is alias name for the tag library name.
JSP provides certain Implicit Objects listed below.
Object
Of Kind
Out
JSP writer
Request
HttpServletRequest
Response
HttpServletRespose
Session
HttpSession
Application
ServletContext
Config
Sevlet Config
Page
Object
PageContext
Page Context => is responsible for generating all other implicit objects.
Out:
This object is instantiated implicitly from JSP Writer class and can be used for displaying anything within delimiters.
For e.g. out.println(?Hi Buddy?);
Request:
It is also an implicit object of class HttpServletRequest class and using this object request parameters can be accessed.
For e.g. in case of retrieval of parameters from last form is as follows:
request.getParameters(?Name?);
Where ?Name? is the form element.
Response:
It is also an implicit object of class HttpServletResponse class and using this object response(sent back to browser) parameters can be modified or set.
For e.g. in case of modifying the HTTP headers you can use this object.
Response.setBufferSize(?50?);
Session:
Session object is of class HttpSession and used to maintain the session information. It stores the information in Name-Value pair.
For e.g.
session.setValue(?Name?,?Jakes?);
session.setValue(?Age?,?22?);
Application:
This object belongs to class SevletContext and used to maintain certain information throughout the scope of Application.
For e.g.
Application.setValue(?servername?,?www.myserver.com?);
PageContext:
This object is of class pageContext and is utilized to access the other implicit objects.
Connection Pooling
<%@ page language=" Java " import=" javax.naming.*,javax.sql.*,java.sql.*,java.util.* "%>
<%
try {
Properties p = new Properties();
p.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
p.put(Context.PROVIDER_URL,"t3://ramses:7001");
InitialContext ic = new InitialContext(p);
DataSource ds = (DataSource)ic.lookup("demoPool");
Connection con = ds.getConnection();
Statement stmt = con.createStatement();
int i = stmt.executeUpdate(
"insert into employee values('" + empEli.getFirstName() + "','" + empEli.getLastName() + "')" );
}
catch(Exception ex) {
ex.printStackTrace();
}
%>
Employee Firstname is :
Employee Lastname is :
Here we are using the property feature to store all the attributes required to use the connection pool like INITIAL_CONTEXT_FACTORY, PROVIDER_URL.
DataSource ds = (DataSource)ic.lookup("demoPool");
This statement looks up for the connection pool already configured in the particular Application Server. Here the name of the connection pool is named as demoPool .
Connection con = ds.getConnection();
This statement gets hold of an connection to the database from the pool of database connections already existing with the application server.
The rest of the statements are standard JDBC statements used in a normal connection to the database.
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In a jsp we should always try to use jsp- style
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Jsp redirect Jsp redirect
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In this section, you will learn how to redirect a page in JSP. You... redirect the jsp
page in a jsp.
Here is the code of redirect.jsp
<html>
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JSP Create Variable JSP Create Variable
JSP Create Variable...;
JSP Create Variable is used to create a variable in jsp. The scriptlets
include a java code to be written as <%! %> provided
INTRODUCTION TO JSP SCRIPTLETS
Introduction to JSP Scriptlets
INTRODUCTION TO JSP...;
Syntax of JSP Scriptles are:
<%
//java codes
%>
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Introduction to JSP Declaratives Declarations
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Syntax of JSP
Comments in Jsp
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Comments in Jsp...;
In a jsp we should always try to use jsp- style
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converted
JSP Modulus JSP Modulus
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JSP Modulus is used to determine the modulus of number in jsp...
In this section, you will learn how to determine the modulus of number
in jsp. As you already
JSP import
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import
...;
An import is the attribute of the page
directive in JSP that imports the java packages
and it's classes whenever required for the JSP page.
More than
Introduction to JSP Scriptlets
Introduction to JSP Scriptlets
INTRODUCTION TO JSP...;
Syntax of JSP Scriptles are:
<%
//java codes
%>
JSP
JSP Actions JSP Actions
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...;
In this section we will explain you about JSP Action
tags and in the next section we will explain the uses of these tags with
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JSP for Each JSP for Each
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JSP Architecture JSP Architecture
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JSP Plugin JSP Plugin
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...;
Syntax: <jsp: plugin type = "bean |applet" code = "ClassFileName" codeBase =
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The <jsp:plugin> is used
JSP Tag Libraries JSP Tag Libraries
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make Java
JSP Current Path JSP Current Path
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JSP Include File JSP Include File
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JSP Variable in Javascript JSP Variable in Javascript
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JSP Error 500 JSP Error 500
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JSP Include Param JSP Include Param
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JSP Window. Open JSP Window. Open
JSP Window. Open...;
JSP Window. Open is used to open a new window in JSP. The JavaScript
function window.open( ) open a new browser window
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How JSP Forwards a request
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Multiple Methods in Jsp
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JSP Request URI JSP Request URI
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JSP Request URI is used to return the URI of the current page in jsp. The
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Question: What do you understand by JSP
Actions?
Answer: JSP actions are XML tags that direct the server to use existing
JSP Value to JavaScript JSP Value to JavaScript
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JSP Value to JavaScript tells you to pass the value from JSP to JavaScript.
The JavaScript create a function that accepts
JSP FUNDAMENTALS