JSTL 1 - 碁峰資訊epaper.gotop.com.tw/PDFSample/acl016200.pdf · JSTL JSTL EL Java Script Java 7-1-1 JSTL 1.1 JSTL 1.1 Servlet 2.4 JSP 2.0 Container JSTL Apache Jakarta Project

JSTL 1.1

JSTL JavaServer Pages Standard Tag Library

1 . 1 J S T L J C P J a v a

Community Process

Java Web

Web JSTL EL Web

Java Scripting

JSTL

U R L

U18N XML SQL JSTL

JSTL

7-1 JSTL 1.1

7-2 Core tag library

7-3 i18n i18n-capable formatting tags

library

7-4 SQL SQL tag library

7-5 XML XML tag library

7-6 Functions tag library

JavaServer Pages Standard Tag Library 1.1 JSP

JSTL

XML

JSTL

1. Core tag library

2. I18N I18N-capable formatting tag library

3. SQL SQL tag library

4. XML XML tag library

5. Functions tag library

JSTL EL Expression Language

JSP

7-2

7-1 JSTL 1.1

JSTL

c <c:out>

URI

http://java.sun.com/jsp/jstl/core

SQL sql <sql:query>http://java.sun.com/jsp/jstl/sql

XML xml <x:forBach>http://java.sun.com/jsp/jstl/fmt

fn <fn:split>http://java.sun.com/jsp/jstl/

functions

I18N fmt <fmt:format

Date>

http://java.sun.com/jsp/jstl/xml

<%= userList.getUser().getPhoneNumber() %>

JSTL

JSTL EL

Java Script

Java

7-1-1 JSTL 1.1

JSTL 1.1 Servlet 2.4 JSP 2.0 Container

JSTL Apache Jakarta Project

http://jakarta.apache.org/builds/jakarta-taglibs/releases/standard/

JSTL 1.1 JSTL 1.1 jakarta-taglibs-

standard-current.zip

7-3

Chapter 7 JSTL 1.1

<c_rt:out value="<%= userList.getUser( ).getPhoneNumber( ) %>" />

<c:out value="${userList.user.phoneNumber}" />

7-1 jakarta-taglibs-standard-1.1.0-B1

lib jstl.jar standard.jar Tomcat WEB-INF\lib

JSP JSTL .jar tld

WEB-INF

- HelloJSTL.jsp

HelloJSTL.jsp

7-4

lib jstl.jar standard.jar old-dependencies

JSTL 1.0 JSTL 1.1

tld TLD JSTL 1.0 TLD

c-1_0.tld c-1_0-rt.tld

<%@ page contentType="text/html;charset=big5" %>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>

<head>

<title> JSTL </title>

</head>

<body>

<c:out value=" JSTL "/>

</br>

:

</br>

<c:out value="${header['User-Agent']}"/>

</body>

</html>

HelloJSTL.jsp Core

EL header JSP JSTL

JSTL

(p re f i x ) c u r i

http://java.sun.com/jsp/jstl/core

out value ${header['User-

Agent']} User-Agent

HelloJSTL.jsp 7-2

7-5

Chapter 7 JSTL 1.1


JSTL 1.0 uri http://java.sun.com/jstl/core

JSTL 1.1 jsp/ JSTL 1.1 JSTL 1.0 1.1

uri http://java.sun.com/jstl/core

JSTL 1.0

<c:out value=" JSTL " />

<c:out value="${header['User-Agent']}" />

7-2 HelloJSTL.jsp

taglib uri web.xml

uri http://www.javaworld.com.tw/jstl/core web.xml

<taglib-uri> URI <taglib-location>

TLD <%@ taglib %>

7-1-2 JSTL 1.1 VS JSTL 1.0

JSTL 1.0 JSTL 1.1

1. EL JSTL 1.0 EL JSP 2.0

JSTL 1.1 EL JSTL EL

2. JSTL 1.0 EL RT JSTL 1.1

EL RT

7-6

<web-app>

<jsp-config>

<taglib>

<taglib-uri>http://www.javaworld.com.tw/jstl/core</taglib-uri>

<taglib-location>/WEB-INF/tld/c.tld</taglib-location>

</taglib>

</jsp-config>

</web-app>

<%@ taglib prefix="c" uri="http://www.javaworld.com.tw/jsp/jstl/core" %>

EL

Expression Language

RT

Scriptlet

Java

EL

3. JSTL 1.1 (functions)

fn:contains fn:containsIgnoreCase fn:endsWith fn:indexOf fn:join

fn:length fn:replace fn:split fn:startsWith fn:substring

JSTL 1.1 B Changes

7-1-3 standard-examples

jakarta-taglibs-standard-current.zip 7-1

standard-examples.war Tomcat webapps

Tomcat webapps standard-examples

IE URL http://localhost:8080/standard-

examples

7-7

Chapter 7 JSTL 1.1

JSTL

General Purpose Tags

Conditional Tags

Iterator Tags

Import Tags

I18N & Formatting Tags

XML Tags

SQL Tags

Functions

Tag Library Validators

Miscellaneous

7-8

7-3 standard-examples

JSTL

Core

URL

7-9

Chapter 7 JSTL 1.1

7-2 Core tag library

Core

out

set

remove

catch

if

choose

when

otherwise

forEach

forTokens

URL

import

param

url

param

redirect

param

JSP JSTL <%@ taglib %>

prefix uri

JSTL

7-2-1

<c:out> <c:set> <c:remove>

<c:catch>

<c:out>

<c:out> <%= scripting-language %>

1 body

<c:out value="value" [escapeXml="{true|false}"] [default="defaultValue"] />

7-10


JSTL

JSTL

Hello ! <c:out value="${username}" />

2

<c:out value="value" [escapeXml="{true|false}"]>

default value

</c:out>

Null

value null default default

<c:out> < > ' " & < >

' " & <c:out>

escapeXml fasle

7-11

Chapter 7 JSTL 1.1

value Object

EL

Y

default ObjectYvalue null

default

escapeXml booleanY true<

<

EL EL Y

attribute = "${ }" N

1. Hello JSP 2.0 !!

2. 8

3. data data data

null No Data

4. <p> </p>

5.

<c:set>

<c:set> JSP JavaBean

1 value scope varName

7-12

Entity

< <

> >

' '

" "

& &

<c:out value="Hello JSP 2.0 !! " />

<c:out value="${ 3 + 5 }" />

<c:out value="${ param.data }" default="No Data" />

<c:out value="<p> </p>" />

<c:out value="<p> </p>" escapeXml="false" />

<c:set value="value" var="varName" [scope="{ page|request|session|

application }"]/>

2 scope varName

<c:set var="varName" [scope="{ page|request|session|application }"]>

...

</c:set>

3 value target

<c:set value="value" target="target" property="propertyName" />

4 target

<c:set target="target" property="propertyName">

...

</c:set>

Null

3 4

target null

target java.util.Map JavaBean7-13

Chapter 7 JSTL 1.1

value Object

EL

Y

var StringN

scope StringN pagevar JSP

property StringYtarget

target ObjectYJavaBean java.util.Map

value null

1 var scope

scope PageContext.removeAttribute(varName, scope)

scope PageContext.removeAttribute(varName)

3

target Map Map.remove(property)

target JavaBean property null

<c:set> var scope

scope="session" session

<c:set> scope Page

1+1 2 number <c:set> value

value <c:set> </c:set>

7-14

var scope

scope="${ourScope}" var="${username}"

<c:set var="number" scope="session" value="${1 + 1}"/>

<c:out value="${1+1}" /> 2 <%=1+1%>

<c:set> body value

<c:set> body

number 1 + 1 1 + 1

1. 2 Request number

2. 8 Session number

3. ${param.number} null Request number

${param.number} null ${param.number} Request

number

7-15

Chapter 7 JSTL 1.1

<c:set var="number" scope="session">

<c:out value="${1+1}" />

</c:set>

<c:set var="number" scope="session">

1 + 1

</c:set>

<c:set var="number" scope="request" value="${1 + 1}" />

<c:set var="number" scope="session" />

${3 + 5}

</c:set>

<c:set var="number" scope="request" value="${ param.number }" />

<c:set target="User" property="name" value="${ param.Username}" />

4. ${param.Username} null User JavaBean name

null ${param.Username} null ${param.Username}

User JavaBean name setter

<c:remove>

<c:remove>

<c:remove var="varName" [scope="{ page|request|session|application }"] />

<c:remove> var scope

7-16

3 ${param.number} null Request

number

var String

EL

N


<c:remove var="number" scope="session" />

number Session scope <c:remove>

Page Request Session Application

number

<c:set> <c:remove>

Core_set_remove.jsp

Core_set_remove.jsp

7-17

Chapter 7 JSTL 1.1

<%@ page contentType="text/html;charset=Big5" %>


<html>

<head>

<title>CH7 - Core_set_remove.jsp</title>

</head>

<body>

<h2><c:out value="<c:set> <c:remove> " /></h2>

<c:set scope="page" var="number">

<c:out value="${1+1}"/>

</c:set>

<c:set scope="request" var="number">

<%= 3 %>

</c:set>

<c:set scope="session" var="number">

7-18

4

</c:set>

<table border="1" width="30%">

<tr>

<th>pageScope.number</th>

<td><c:out value="${pageScope.number}" default="No Data" /></td>

</tr>

<tr>

<th>requestScope.number</th>

<td><c:out value="${requestScope.number}" default="No Data" /></td>

</tr>

<tr>

<th>sessionScope.number</th>

<td><c:out value="${sessionScope.number}" default="No Data" /></td>

</tr>

</table></br>

<c:out value='<c:remove var="number" scope="page" /> '/>

<c:remove var="number" scope="page" />


<tr>



</tr>

<tr>



</tr>

<tr>


Page Request Session

number <c:remove var="number" scope="page" /> Page

number <c:remove var="number" />

number Core_set_remove.jsp

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Chapter 7 JSTL 1.1


</tr>

</table></br>

<c:out value='<c:remove var="number" /> '/>

<c:remove var="number" />


<tr>



</tr>

<tr>



</tr>

<tr>



</tr>

</table>

</body>

</html>

<c:catch>

<c:catch>

<c:catch [var="varName"] >

...

</c:catch>

7-20

7-4 Core_set_remove.jsp

var String

EL

N

<c:catch> <c:catch> </c:catch>

varName

<c:catch> </c:catch> <c:catch>

</c:catch>

Core_catch.jsp <c:catch>

Core_catch.jsp

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Chapter 7 JSTL 1.1

<c:catch var="message">

//

</c:catch>



<html>

<head>

<title>CH7 - Core_catch.jsp</title>

</head>

<body>

<h2><c:out value="<c:catch> " /></h2>

<c:catch var="error_Message">

<%

<c:catch>

error_Message <c:out>

7-5

<c:catch>

<c:catch> </c:catch> 7-6

7-22

String eFormat = "not number";

int i = Integer.parseInt(eFormat);

%>

</c:catch>

${error_Message}

</body>

</html>

7-5 Core_catch.jsp

7-2-2

<c: i f> <c:choose> <c:when>

<c:otherwise>

<c:if>

<c:if> if

1 body

<c:if test="testCondition" var="varName" [scope="{page|request|session|

application}"]/>

7-23

Chapter 7 JSTL 1.1

7-6 Core_catch.jsp <c:catch> </c:catch>

2

<c:if test="testCondition" [var="varName"] [scope="{page|request|session|

application}"]>

</c:if>

<c:if> test test true

false ${param.username = = 'admin'}

param.username admin true admin

false

admin "ADMIN !! // body "

<c:if> body "ADMIN !! body "

<c:if> JSP Scriptlet JSP

HTML

7-24

test boolean

EL

Ytrue

false

var StringNt e s t

true false


<c:if test="${param.username = = 'admin' }">

ADMIN !! //body

</c:if>

test <c:if> var scope <c:if>

var scope var

var scope

Core_if.jsp

Core_if.jsp

7-25

Chapter 7 JSTL 1.1



<html>

<head>

<title>CH7 - Core_if.jsp</title>

</head>

<body>

<h2><c:out value="<c:if> " /></h2>

<c:if test="${param.username == 'Admin'}" var="condition" scope="page">

Admin

</c:if></br>

:${condition}

</body>

</html>

username Admin

condition true pageScope false condition

JSTL condition

${condition} ${pageScope.condition} Core_if.jsp

7-7

<c:choose>

<c:choose> <c:when> <c:otherwise>

<c:choose>

( <when> <otherwise> )

</c:choose>

7-26

core_if.jsp ?username=Admin

7-7 Core_if.jsp

<c:choose>

1 <c:when>

0 <c:otherwise>

<c:when> <c:otherwise>

<c:choose>

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Chapter 7 JSTL 1.1

<c:choose>

<c:when>

</c:when>

<c:otherwise>

</c:otherwise>

</c:choose>

<c:when>

<c:when> when

<c:when test="testCondition" >

</c:when>

<c:when> <c:choose> </c:choose>


<c:when> test test true

false

<c:otherwise>

<c:choose> <c:when>

<c:otherwise>

7-28

test boolean

EL

Ytrue

false

<c:otherwise>

</c:otherwise>

<c:otherwise> <c:choose> </c:choose>

<c:choose> <c:otherwise>

<c:choose> <c:when> test true

<c:otherwise>


7-29

Chapter 7 JSTL 1.1

<c:choose>

<c:when test="${condition1}">

condition1 true

</c:when>

<c:when test="${ condition2}">

condition2 true

</c:when>

condition1 true "condition1 true" condition1

false condition2 true "condition2 true"

false "condition1 condition2 false"

7-2-3

Iterate <c:forEach> <c:forTokens>

<c:forEach>

<c:forEach> (Collection)

<c:forEach>

7-30

<c:otherwise>

condition1 condition2 false

</c:otherwise>

</c:choose>

condition1 condition2 true "condition1

true" <c:choose> <c:when>

<c:when>

1

<c:forEach [var="varName"] items="collection" [varStatus="varStatusName"]

[begin="begin"] [end="end"] [step="step"]>

</c:forEach>

2

<c:forEach [var="varName"] [varStatus="varStatusName"] begin="begin"

end="end" [step="step"]>

</c:forEach>

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Chapter 7 JSTL 1.1

var String

EL

N

begin intY 0

step intY 1

end intY

varStatus StringN

items Arrays

Collection

Iterator

Enumera-tion

Map

String

Y

begin begin 0

end begin

step step 0

Null

items null

begin items

items

Core_forEach.jsp

Core_forEach.jsp

7-32



<html>

<head>

<title>CH7 - Core_forEach.jsp</title>

</head>

<body>

<h2><c:out value="<c:forEach> " /></h2>

atts Request

<c:forEach> items

var <c:out> item

7-8

7-33

Chapter 7 JSTL 1.1

<%

String atts[] = new String [5];

atts[0]="hello";

atts[1]="this";

atts[2]="is";

atts[3]="a";

atts[4]="pen";

request.setAttribute("atts", atts);

%>

<c:forEach items="${atts}" var="item" >

${item}</br>

</c:forEach>

</body>

</html>

7-8 Core_forEach.jsp

<c : fo rEach> J2SE

ArrayList List LinkedList Vector Stack Set

java.util.Map HashMap Hashtable Properties Provider

Attributes

<c:forEach> begin end step begin

( 0) end step

Core_forEach1.jsp

7-34

varName <c:forEach>

varName ${item} </c:forEach>

<c:forEach items="${atts}" var="item" >

</c:forEach>

${item}</br>

${item} item



<html>

<head>

<title>CH7 - Core_forEach1.jsp</title>

</head>

<body>

<c:forEach> atts 2 5

atts[1] atts[3]

7-9

7-35

Chapter 7 JSTL 1.1

<h2><c:out value="<c:forEach> begin end step " /></h2>

<%


atts[0]="hello";

atts[1]="this";

atts[2]="is";

atts[3]="a";

atts[4]="pen";


%>

<c:forEach items="${atts}" var="item" begin="1" end="4" step="2" >

${item}</br>

</c:forEach>

</body>

</html>

7-9 Core_forEach1.jsp

begin end step

begin end step

1. begin end

7-36

<%

int atts[] = {1,2,3,4,5,6,7,8,9,10};


%>

<c:forEach items="${atts}" var="item" begin="0" end="9" step="1" >

${item}</br>

</c:forEach>

begin

-

end

-

step

- 1 2 3 4 5 6 7 8 9 10

5 - - 6 7 8 9 10

- 5 - 1 2 3 4 5 6

- - 5 1 6

5 5 - 6

5 5 5 6

0 8 2 1 3 5 7 9

0 8 3 1 4 7

0 8 4 1 5 9

15 20 -

20 8 -

0 20 - 1 2 3 4 5 6 7 8 9 10

2. begin end

3. end end

4. <c:forEach>

items items

begin end

Core_forEach2.jsp

begin end

1 10

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Chapter 7 JSTL 1.1



<html>

<head>


</head>

<body>

<h2><c:out value="<c:forEach> " /></h2>

<c:forEach begin="1" end="10" var="item" >

${item}</br>

</c:forEach>

</body>

</html>

10 item Core_forEach2.jsp

7-10

step step 2 7-11

<c:forEach> varStatus

varStatus="s" s

varStatus index count first last

7-38


7-11 step 2

varStatus

Core_forEach3.jsp

7-39

Chapter 7 JSTL 1.1

index number

count number

first boolean

last boolean



<html>

<head>


</head>

<body>

<h2><c:out value="<c:forEach> varStatus " /></h2>

<%


atts[0]="hello";

atts[1]="this";

atts[2]="is";

atts[3]="a";

atts[4]="pen";


%>

7-12

7-40

<c:forEach items="${atts}" var="item"varStatus="s">

<h2><c:out value="${item}"/> </h2>

index ${s.index}</br>

count ${s.count}</br>

first ${s.first}</br>

last ${s.last}</br>

</c:forEach>

</body>

</html>


<c:forTokens>

<c:forTokens>

delimiters

<c:forTokens items="stringOfTokens" delims="delimiters" [var="varName"]

[varStatus="varStatusName"] [begin="begin"] [end="end"] [step="step"]>

</c:forTokens>

begin begin 0

end begin

step step 0

7-41

Chapter 7 JSTL 1.1

var String

EL

N

items StringY

delims StringN

varStatus StringN

begin intY 0

step intY 1

end intY

Null

items null

begin items

<c:forTokens> begin end step var varStatus <c:forEach>

items delims items

delims items

<c:forTokens>

ABCDE (,)

5 5 A,B,C,D,E (,)

items EL

7-42

<c:forTokens items="A,B,C,D,E" delims="," var="item" >

${item}

</c:forTokens>

<%

String phoneNumber = "123-456-7899";

request.setAttribute("userPhone", phoneNumber);

%>

<c:forTokens items="${userPhone}" delims="-" var="item" >

${item}

</c:forTokens>

1234567899 123-456-7899 (-)

3 item

delims

ABCDE delims

<c:forEach>

ABCDE <c:forEach> delims

<c:forEach> <c:forEach>

(,) <c:forTokens> delims (,)

<c:forTokens> <c:forEach>

7-2-4 URL

JSTL URL <c : impo r t>

<c:redirect> <c:url>

url

7-43

Chapter 7 JSTL 1.1

<c:forTokens items="A,B;C-D,E" delims=",;-" var="item" >

${item}

</c:forTokens>

<c:forEach items="A,B,C,D,E" var="item" >

${item}

</c:forEach>

<c:import>

<c:import> JSP JSP Action

<jsp:include> <jsp:include> web

application <c:import> web application

web application

1

<c:import url="url" [context="context"] [var="varName"] [scope="{page|

request|session|application}"] [charEncoding="charEncoding"]>

</c:import>

2

<c:import url="url" [context="context"] varReader="varReaderName"

[charEncoding="charEncoding"]>

</c:import>

7-44

url String

EL

Y

scope StringN Pagevar JSP

context StringYContainer web

/

var StringN

String

Null

url null JspException

<c:import> url

<c:import> http://java.sun.com

<c: impor t> FTP FTP

ftp.javaworld.com.tw data.txt

Hello.jsp <c:import>

webapps <c:import>

/ web Tomcat

webapps hello.txt webapps/examples/images

context examples hello.txt

JSP 7-45

Chapter 7 JSTL 1.1

charEncoding String

EL

Y

varReader StringN

Reader

<c:import url="http://java.sun.com" />

<c:import url="ftp://ftp.cse.yzu.edu.tw/data.txt" />

<c:import url="Hello.jsp" />

web

context web others

others jsp index.html

<c:import> var scope var

String

varName scope varName

7-46

<c:import url="images/hello.txt" />

<c:import url="/jsp/index.html" context="/others" />

web server.xml <Context>

crossContext true others

web

server.xml

<Context path="/others" docBase="others" debug="0"

reloadable="true" crossContext="true"/>

<c:import url="/images/hello.txt" var="s" scope="session" />

<c:import> <c:param>

name value

EL

< c : i m p o r t > < c : p a r a m >

Core_import.jsp Core_imported.jsp

Core_import.jsp

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Chapter 7 JSTL 1.1

name String

EL

Y

value StringY

<c:import url="http://java.sun.com" >

<c:param name="test" value="1234" />

</c:import>

http://java.sun.com?test=1234



<html>

<head>

<title>CH7 - Core_import.jsp</title>

</head>

<c:set> <c:param>

Core_imported.jsp

7-48

<body>

<h2><c:out value="<c:import> " /></h2>

<c:set var="input1" value=" Core_imported.jsp "

scope="request"/>

core_imported.jsp <hr/>

<c:import url="Core_imported.jsp" >

<c:param name="input2" value=" <c:param> Core_imported.jsp "/>

</c:import><hr/>

${output/}

</body>

</html>



<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>

<html>

<head>

<title>CH7 - Core_imported.jsp</title>

</head>

<body>

core_imported.jsp core_import.jsp

input1

${input1} input2 ${param.input2}

<c:set> Core_import.jsp <c:param>

<c:param>

Core_import.jsp

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<fmt:requestEncoding value="Big5" />

<c:set var="output1" value=" Core_import.jsp " scope="request"/>

${input}

<c:out value="${param.input2}"escapeXml="true"/>

</body>

</html>

7-13 Core_import.jsp

<c:url>

<c:url> URL

1

<c:url value="value" [context="context"] [var="varName"] [scope="{page|

request|session|application}"] />

2 (Query String)

<c:url value="value" [context="context"] [var="varName"]

[scope="{page|request|session|application}"] >

<c:param>

</c:url>

7-50

value String

EL

YURL


/

var StringN

String

scope StringN Pagevar JSP

<c:url value="http:// www.javaworld.com.tw " >

<c:param name="param" value="value"/>

</c:url>

<c:url> <c:param>

http://www.javaworld.com.tw?param=value HTML

<a>

<c:url> context var scope context

<c:import> web <c:url>

var varName

<c:url>

web

<c:url>

<c:url> web

image code.gif

<c:redirect>

<c:redirect> JSP

1

<c:redirect url="url" [context="context"] />

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Chapter 7 JSTL 1.1

<a href="

<c:url value="http:// www.javaworld.com.tw " >


</c:url>"> Java </a>

<img src="<c:url value="/images/code.gif" />" />

2 (Query String)

<c:redirect url="url" [context="context"] >

<c:param>

</c:redirect >

url

http://www.javaworld.com.tw

context web

/others /jsp/index.html

<c:redirect>

<c:param>

7-52

url String

EL

Y


/

<c:redirect url="http://www.javaworld.com.tw" />

<c:redirect url="/jsp/index.html" context="/others" />

Core_redirect.jsp

http://

java.sun.com/?param=

value

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Chapter 7 JSTL 1.1



<html>

<head>

<title>CH7 - Core_redirect.jsp</title>

</head>

<body>

<h2><c:out value="<c:redirect> " /></h2>

<c:redirect url="http://java.sun.com">


</c:redirect>

<c:out value=" !!!" />

</body>

</html>

7-14 Core_redirect.jsp

Documents

JSTL 1 - 碁峰資訊epaper.gotop.com.tw/PDFSample/acl016200.pdf · JSTL JSTL EL Java Script Java 7-1-1 JSTL 1.1 JSTL 1.1 Servlet 2.4 JSP 2.0 Container JSTL Apache Jakarta Project