Vyoms OneStopTesting.com - Testing EBooks, Tutorials, Articles, Jobs, Training Institutes etc.
OneStopGate.com - Gate EBooks, Tutorials, Articles, FAQs, Jobs, Training Institutes etc.
OneStopMBA.com - MBA EBooks, Tutorials, Articles, FAQs, Jobs, Training Institutes etc.
OneStopIAS.com - IAS EBooks, Tutorials, Articles, FAQs, Jobs, Training Institutes etc.
OneStopSAP.com - SAP EBooks, Tutorials, Articles, FAQs, Jobs, Training Institutes etc.
OneStopGRE.com - of GRE EBooks, Tutorials, Articles, FAQs, Jobs, Training Institutes etc.
Bookmark and Share Rss Feeds

The Components of JSPs | Articles | Recent Articles | News Article | Interesting Articles | Technology Articles | Articles On Education | Articles On Corporate | Company Articles | College Articles | Articles on Recession
Sponsored Ads
Hot Jobs
Fresher Jobs
Experienced Jobs
Government Jobs
Walkin Jobs
Placement Section
Company Profiles
Interview Questions
Placement Papers
Resources @ VYOMS
Companies In India
Consultants In India
Colleges In India
Exams In India
Latest Results
Notifications In India
Call Centers In India
Training Institutes In India
Job Communities In India
Courses In India
Jobs by Keyskills
Jobs by Functional Areas
Learn @ VYOMS
GATE Preparation
GRE Preparation
GMAT Preparation
IAS Preparation
SAP Preparation
Testing Preparation
MBA Preparation
News @ VYOMS
Freshers News
Job Articles
Latest News
India News Network
Interview Ebook
Get 30,000+ Interview Questions & Answers in an eBook.
Interview Success Kit - Get Success in Job Interviews
  • 30,000+ Interview Questions
  • Most Questions Answered
  • 5 FREE Bonuses
  • Free Upgrades


Wipro Technologies
Tata Consultancy Services
Cognizant Technologies

Home » Articles » The Components of JSPs

The Components of JSPs

Article Posted On Date : Monday, January 25, 2010

The Components of JSPs

JSP syntax is almost similar to XML syntax. The following general rules are applicable to all JSP tags.

1. Tags have either a start tag with optional attributes, an optional body, and a matching end tag or they have an empty tag possibly with attributes.

2. Attribute values in the tag always appear quoted. The special strings ' and " can be used if quotes are a part of the attribute value itself.

Any whitespace within the body text of a document is not significant, but is preserved, which means that any whitespace in the JSP being translated is read and preserved during translation into a servlet.

The character can be used as an escape character in a tag, for instance, to use the % character, \% can be used.

JavaServer Pages are text files that combine standard HTML and new scripting tags. JSPs look like HTML, but they get compiled into Java servlets the first time they are invoked. The resulting servlet is a combination of HTML from the JSP file and embedded dynamic content specified by the new tags. Everything in a JSP page can be divided into two categories:

1. Elements that are processed on the server

2. Template data or everything other than elements, that the engine processing the JSP engines.

Element data or that part of the JSP which is processed on the server, can be classified into the following categories:

1. Directives

2. Scripting elements

3. Standard actions

JSP directives serve as messages to the JSP container from the JSP. They are used to set global values such as class declaration, methods to be implemented, output content type, etc. They do not produce any output to the client. All directives have scope of the entire JSP file. That is, a directive affects the whole JSP file, and only that JSP file. Directives are characterized by the @ character within the tag and the general syntax is:

The three directives are page, include and taglib.

Scripting elements are used to include scripting code (Java code) within the JSP. They allow to declare variables and methods, include arbitrary scripting code and evaluate an expression. The three types of scripting element are: Declaration, Scriptlets and Expressions.

A declaration is a block of Java code in a JSP that is used to define class-wide variables and methods in the generated class file. Declarations are initialized when the JSP page is initialized and have class scope. Anything defined in a declaration is available throughout the JSP, to other declarations, expressions or code.

A scriptlet consists of one or more valid Java statements. A scriptlet is a block of Java code that is executed at request-processing time. A scriptlet is enclosed between "<%" and "%>". What the scriptlet actually does depends on the code, and it can produce output into the output stream to the client. Multiple scriptlets are combined in the compiled class in the order in which they appear in the JSP. Scriptlets like any other Java code block or method, can modify objects inside them as a result of method invocations.

An expression is a shorthand notation for a scriptlet that outputs a value in the response stream back to the client. When the expression is evaluated, the result is converted to a string and displayed, An expression is enclosed within <%= and %> "<%=" and "%>". If any part of expression is an object, the conversion is done using the toString() method of the object.

Standard actions are specific tags that affect the runtime behavior of the JSP and affect the response sent back to the client. The JSP specification lists some standard action types to be provided by all containers, irrespective of the implementation. Standard actions provide page authors with some basic functionality to exploit; the vendor is free to provide other actions to enhance behavior.

Sponsored Ads

Interview Questions
HR Interview Questions
Testing Interview Questions
SAP Interview Questions
Business Intelligence Interview Questions
Call Center Interview Questions


Clipper Interview Questions
DBA Interview Questions
Firebird Interview Questions
Hierarchical Interview Questions
Informix Interview Questions
Microsoft Access Interview Questions
MS SqlServer Interview Questions
MYSQL Interview Questions
Network Interview Questions
Object Relational Interview Questions
PL/SQL Interview Questions
PostgreSQL Interview Questions
Progress Interview Questions
Relational Interview Questions
SQL Interview Questions
SQL Server Interview Questions
Stored Procedures Interview Questions
Sybase Interview Questions
Teradata Interview Questions

Microsof Technologies

.Net Database Interview Questions
.Net Deployement Interview Questions
ADO.NET Interview Questions
ADO.NET 2.0 Interview Questions
Architecture Interview Questions
ASP Interview Questions
ASP.NET Interview Questions
ASP.NET 2.0 Interview Questions
C# Interview Questions
Csharp Interview Questions
DataGrid Interview Questions
DotNet Interview Questions
Microsoft Basics Interview Questions
Microsoft.NET Interview Questions
Microsoft.NET 2.0 Interview Questions
Share Point Interview Questions
Silverlight Interview Questions
VB.NET Interview Questions
VC++ Interview Questions
Visual Basic Interview Questions

Java / J2EE

Applet Interview Questions
Core Java Interview Questions
Eclipse Interview Questions
EJB Interview Questions
Hibernate Interview Questions
J2ME Interview Questions
J2SE Interview Questions
Java Interview Questions
Java Beans Interview Questions
Java Patterns Interview Questions
Java Security Interview Questions
Java Swing Interview Questions
JBOSS Interview Questions
JDBC Interview Questions
JMS Interview Questions
JSF Interview Questions
JSP Interview Questions
RMI Interview Questions
Servlet Interview Questions
Socket Programming Interview Questions
Springs Interview Questions
Struts Interview Questions
Web Sphere Interview Questions

Programming Languages

C Interview Questions
C++ Interview Questions
CGI Interview Questions
Delphi Interview Questions
Fortran Interview Questions
ILU Interview Questions
LISP Interview Questions
Pascal Interview Questions
Perl Interview Questions
PHP Interview Questions
Ruby Interview Questions
Signature Interview Questions
UML Interview Questions
VBA Interview Questions
Windows Interview Questions
Mainframe Interview Questions

Copyright © 2001-2022 Vyoms.com. All Rights Reserved. Home | About Us | Advertise With Vyoms.com | Jobs | Contact Us | Feedback | Link to Us | Privacy Policy | Terms & Conditions
Placement Papers | Get Your Free Website | IAS Preparation | C++ Interview Questions | C Interview Questions | Report a Bug | Romantic Shayari | CAT 2022

Fresher Jobs | Experienced Jobs | Government Jobs | Walkin Jobs | Company Profiles | Interview Questions | Placement Papers | Companies In India | Consultants In India | Colleges In India | Exams In India | Latest Results | Notifications In India | Call Centers In India | Training Institutes In India | Job Communities In India | Courses In India | Jobs by Keyskills | Jobs by Functional Areas

Testing Articles | Testing Books | Testing Certifications | Testing FAQs | Testing Downloads | Testing Interview Questions | Testing Jobs | Testing Training Institutes

Gate Articles | Gate Books | Gate Colleges | Gate Downloads | Gate Faqs | Gate Jobs | Gate News | Gate Sample Papers | Gate Training Institutes

MBA Articles | MBA Books | MBA Case Studies | MBA Business Schools | MBA Current Affairs | MBA Downloads | MBA Events | MBA Notifications | MBA FAQs | MBA Jobs
MBA Job Consultants | MBA News | MBA Results | MBA Courses | MBA Sample Papers | MBA Interview Questions | MBA Training Institutes

GRE Articles | GRE Books | GRE Colleges | GRE Downloads | GRE Events | GRE FAQs | GRE News | GRE Training Institutes | GRE Sample Papers

IAS Articles | IAS Books | IAS Current Affairs | IAS Downloads | IAS Events | IAS FAQs | IAS News | IAS Notifications | IAS UPSC Jobs | IAS Previous Question Papers
IAS Results | IAS Sample Papers | IAS Interview Questions | IAS Training Institutes | IAS Toppers Interview

SAP Articles | SAP Books | SAP Certifications | SAP Companies | SAP Study Materials | SAP Events | SAP FAQs | SAP Jobs | SAP Job Consultants
SAP Links | SAP News | SAP Sample Papers | SAP Interview Questions | SAP Training Institutes |

Copyright ©2001-2022 Vyoms.com, All Rights Reserved.
Disclaimer: VYOMS.com has taken all reasonable steps to ensure that information on this site is authentic. Applicants are advised to research bonafides of advertisers independently. VYOMS.com shall not have any responsibility in this regard.