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Java
JSP Expression Language

Understanding Expression Language in JSP

JSP Expression Language
How EL expression is used?

JSP Expression Language

Expression Language(EL) was added to JSP 2.0 specification. The purpose of EL is to produce scriptless JSP pages. The syntax of EL in a JSP is as follows:

${expr}

Here expr is a valid EL expression. An expression can be mixed with static text/values and can also be combined with other expressions to form larger expression.

How EL expression is used?

EL expression can be used in two ways in a JSP page

As attribute values in standard and custom tags. Example:
```
<jsp:include page="${location}">
```
Where location variable is separately defines in the jsp page.

Expressions can also be used in jsp:setProperty to set a properties value, using other bean properties like : If we have a bean named Square with properties length, breadth and area.
```
<jsp:setProperty name="square" property="area" value="${square.length*square.breadth}" />
```
To output in HTML tag:
```
<h1>Welcome ${name}</h1>
```

To deactivate the evaluation of EL expressions, we specify the isELIgnored attribute of the page directive as below:

<%@ page isELIgnored ="true|false" %>

JSP EL Implicit Objects

Following are the implicit objects in EL :

Implicit Object	Description
pageContext	It represents the PageContext object.
pageScope	It is used to access the value of any variable which is set in the Page scope
requestScope	It is used to access the value of any variable which is set in the Request scope.
sessionScope	It is used to access the value of any variable which is set in the Session scope
applicationScope	It is used to access the value of any variable which is set in the Application scope
param	Map a request parameter name to a single value
paramValues	Map a request parameter name to corresponding array of string values.
header	Map containing header names and single string values.
headerValues	Map containing header names to corresponding array of string values.
cookie	Map containing cookie names and single string values.

Example of JSP EL

Let's take a simple example for understanding the JSP expression language,

index.jsp


<form method="POST" action="welcome.jsp">
    Name <input type="text" name="user" >
    <input type="submit" value="Submit">
</form>

welcome.jsp

<html>
    <head>
        <title>Welcome Page</title>
    </head>

      <body>
        <h1>Welcome ${param.name}</h1>
      </body>
</html>

Arithmetic Operations available in EL

Following are the arithmetic operators avilable in EL:

Arithmetic Operation	Operator
Addition	`+`
Substraction	`-`
Multiplication	`*`
Division	`/ and div`
Remainder	`% and mod`

Logical and Relational Operators available in EL

Following are the logical operator and comparators avilable in EL:

Logical and Relational Operator	Operator
Equals	`== and eq`
Not equals	`!= and ne`
Less Than	`< and lt`
Greater Than	`> and gt`
Greater Than or Equal	`>= and ge`
Less Than or Equal	`<= and le`
and	`&& and and`
or	`
not	`! and not`

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Understanding Expression Language in JSP

Contents

JSP Expression Language

How EL expression is used?

JSP EL Implicit Objects

Example of JSP EL

Arithmetic Operations available in EL

Logical and Relational Operators available in EL

JSP Tutorial

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Computer Networks Tutorial

Operating System Tutorial

DBMS and SQL Tutorial

Java Tutorial

C Language Tutorial

PHP Tutorial

Android Tutorial

Linux Guide Tutorial

Data Structures and Algorithms Tutorial

Computer Architecture

HTML 5 References Tutorial

Docker Tutorial

GIT (Using Github) Tutorial

Go Language Tutorial

GIT Guide

CSS Tutorial

Advanced Data Structures

Spring Framework Tutorial

Spring Boot Tutorial

Kotlin Tutorial

Apache Cordova Tutorial

Python Tutorial

SASS-SCSS Tutorial

MongoDB Tutorial

Numpy Tutorial

PL-SQL Tutorial

Python Built-in Functions Tutorial

Pandas Tutorial

Elasticsearch Tutorial

Matplotlib Tutorial

Web Scraping Tutorial

Networking with Python

Tkinter Tutorial

Java Programs Tutorial

Servlet Tutorial

Java Type Conversion Tutorial