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JSTL

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9

8

7

6

SQL Library5

XML Library4

Formatting Library3

Core Library2

JSTL(JSP Standard Tag Library)1

Contents

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Know

The JSP Standard Tag Library

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Be Able To

Use the JSP Standard Library

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Our aim is to write scriptless JSP. What

helps you write scriptless JSPs?Are they enough?

Question?

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JSTL

(JSP Standard Tag Library)

EL and standard actions help us write scriptlessJSP.

But these are not enough for operations like

iterating through an array or do some databaselookup. For such operations there are some inbuilt tag

libraries called JSP Standard Tag Library (JSTL) JSTL tag libraries can be classified into 4 types

Core library, Formatting library XML library

SQL library

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Prerequisites for using JSTL Jar file required for JSTL to be in the classpath of the

application server jstl.jar : contains the classes for the tags.

standard.jar: contains all the tld files

Any JSP file should include the following directive to availrespective JSTL tags for Core JSTL tags for XML Tags for Formatting tags

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JSTL installation in tomcat

Search for the standard.jar and jstl.jar files in

tomcats installation directory.

In your web application create a directory lib

inside the WEB-INF .

Paste the two jar files in /WEB-INF/lib.

In your jsp page use the respective taglib

directives.

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Core Library

General-purpose

Conditional

Iteration

URL related

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Used to evaluate an expression and the resulting value is

written in the tag body. Syntax

Without body

With bodydefault value

If escapeXml is set to true, then XML-confusing characters< ,> ,&, and is automatically converted to theircharacter-entity equivalent , &,', ".

default

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Example

c:out Example

ABC

JSTLEx1

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Used to set the value of a variable or property.

Syntax

Using an attribute value

Using a tag body

body content

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Using an attribute value to set a propertyvalue

Using a tag body to set a property value

Body content

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Examplec:set Example

${name}

${header.host} ${requestScope.name}

${name}
JSTLEx2

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Cust Name :${cust.name}Cust No. ${cust.eno}

Cust Name :${cust.name}

2112Cust No. ${cust.eno}Cust No. ${cust.eno}

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Removes a variable from the specified scope.

Syntax:

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Catches exception thrown by any tag in its body.

Syntax

nested actions

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Example

c:remve and c:catch Example

Exception : ${x}

Prints :

Exception : org.apache.jasper.JasperException

JSTLEx3

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If the value of attribute is true the body is executed.

Syntax With body

Without bodybody content

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Example

JSTLEx4

Check The

NameWelcome to our page!

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Like the switch statement

Syntax

body content ( and

)

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java.lang.Thread class orjava.lang.Runnable interface Java Virtual Machine

javax.http.servlet package

Java Server Pages. Noting selected

Example

JSTLEx5

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Example Book List ${i}

You have selected the following

books.

${book}

JSTLEx6

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Used to loop over tokenized elements of a string like

StringTokenizer. Syntax

Body content

Example

${i}

JSTLEx7

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Used likebut with the exception toinclude pages even out of the same servlet context.

Syntax

The resource to be included in the specified variable

name

optional body content

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The resource

body content where varReader isconsumed by another action

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Used with , and

Syntax

Without body

With body

parameter value

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Example

c:import Example

Including page

We will define a custom tag to

read this document

JSTLEx9

show jsp

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if(r== null) {throw new JspException("Error! ");

}try {pageContext.getOut().print("Reading the page....
");while((character = r.read()) != -1)

pageContext.getOut().print((char)character);}catch(java.io.IOException ex) {throw new JspException(ex.getMessage());

}return SKIP_BODY;}}

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Example

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Used to send HTTP redirect. Similar to

HttpServletResponse.sendRedirect Syntax

Without body content

With query string parameters

subtags

Example:

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XML Library

Core XML actions

XML flow control

Transform actions

In Tomcat install jaxen and

saxpath jar files.

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Reading XML doc

Data Collected from a .xmlfile.

index.jsp

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Book Title:Book Price:

Other examples of XPATH:Any descendant: $doc//titleSelf: $doc/books/book/.@attribute: $doc//book[@id="997"]/title

child: $doc/books/book[title='Mastering EJB']

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Saves the result of the selectXPath expression to ascoped variable. Returned value may be a node set

(XML fragment), boolean, string, or number.

Syntax

Example:

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FlowControl: Evaluates the XPath expression in the select attribute. If the

value is true, writes its tag body. Syntax

Without body content

With body content

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FlowControl:

Marks the beginning of a conditional section like javaswitch statement.

Syntax

body content( and subtags)

Body content conditional block

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FlowControl:

Evaluates the given XPath expression and

repeats its nested its body content over the

result, setting the context node to each element

in the iteration. Syntax

body content

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Example

XMLMastering EJB

A comprehensive book on EJB3.0455The complete reference JSP495

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P i

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Price:

Desc:-->

jstlEx11

T f A ti

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Transform Action:

Transforms an XML document with an XSLTtransformation.

Syntax: Without body

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With a body for the input document andpossibly parameters

XML document to parse

[ actions]

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Sets transformation parameters. Only valid inside

Syntax

parametervalue

E l

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Example

XSTL

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Sets the resource bundle.

Syntax

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Used to look up a message in a resource bundleby a key.

Syntax

Without a body

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With body for parameters

subtags

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With body for key and optional messageparameters

key optional subtags

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Used to supply parameters to

action.

Syntax

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Example

format

JSTLEx13

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JSTLEx13\WEB-INF\classes\MessageResources.property

Content

welcome.title=Welcome to the world of JSTLformatting tag

welcome.user=Hello {0}

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Used to set the localization context, based

on the specified resource bundle, to beused within the body content of this tag.

Syntax

body content

E l

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Example

format

JSTLEx14

line.red=line.blue=

MessageResources.property

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Sets a specific character encoding (see

http://www.iana.org/assignments/character-sets) to

decode request parameters.

Omitting a value indicates to use automatic detection

of the proper encoding Syntax

Example:

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A wrapper to temporarily set the time zone.

Syntax

body content

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Binds the specific time zone to a variable.

Syntax

Example

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Example

format Pacific Time:

Local Time:

f t f tN b

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Used to format a numeric value in a locale-

sensitive or customized manner as anumber,currency, or percentage.

Syntax

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[maxIntegerDigits=maxIntDigits][minIntegerDigits=minIntDigits][maxFractionDigits=maxFracDigits]

[minFractionDigits=minFracDigits]

[var=varName][scope={page|request|session|

application}]/>

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Used to parse the string representation of numbers,currencies, and percentages that were formatted in alocale-sensitive or customized manner.

Syntax

E l

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Example

format

JSTLEx16

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Allows the formatting of dates and times in a locale-sensitive or customized manner.

Syntax

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Parses the string representation of dates and times that

were formatted in a locale-sensitive or customized manner. Syntax

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SQL Library

Database access

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Used to query a database.

Syntax Without body

actions

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Used to export a data source either as a scoped variable or

as the data source configuration variable

(javax.servlet.jsp.jstl.sql.dataSource).

Syntax

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q p Used to execute an SQL INSERT, UPDATE,or DELETE

statement. (and SQL statements that return nothing)

Syntax

Without body

With body

actions

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Used to set the values of parameter markers(?) in a SQL statement.

Syntax

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Used to establishes a transaction context for and subtags.

Syntax

and statements

any nested and actionsmust not specify a dataSource attribute.

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Likefor values of typejava.util.Date. Subtag ofand.

Syntax

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l d l i i

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.

Names like XXXtesh

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,