Jstl Tag Library

Core tags

The core tag is the most commonly used jstl tag. The syntax for referencing the core tag library is as follows:

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

label	Description
<c:out>	Used to display data in JSPs, like <%= ... >
<c:set>	For saving data
<c:remove>	Used to delete data
<c:catch>	To handle the abnormal condition that caused the error, and to store the error message.
<c:if>	Same as we do in the general procedure
<c:choose>	Only as a parent tag for <c:when> and <c:otherwise>
<c:when>	<c:choose> Sub-tags to determine if conditions are true
<c:otherwise>	<c:choose> Sub-label, followed by the <c:when> tag, when the <c:when> tag is judged to be false when it is executed
<c:import>	Retrieves an absolute or relative URL, and then exposes its contents to the page
<c:forEach>	Base iteration tags, accepting multiple collection types
<c:forTokens>	Separates content and iterates output according to the specified delimiter
<c:param>	Used to pass parameters to a page that contains or redirects
<c:redirect>	Redirect to a new URL.
<c:url>	Use optional query parameters to create a URL

Formatting labels

The JSTL format label is used to format and output text, date, time, and number. The syntax for referencing the formatting tag library is as follows:

<%@ taglib prefix = "FMT"  Uri=%>         

label	Description
<fmt:formatNumber>	Formats a number using the specified format or precision
<fmt:parseNumber>	Parse a string representing a number, currency, or percentage
<fmt:formatDate>	Formats the date and time with the specified style or pattern
<fmt:parseDate>	Parse a string that represents a date or time
<fmt:bundle>	Binding Resources
<fmt:setLocale>	Designated Area
<fmt:setBundle>	Binding Resources
<fmt:timeZone>	Specify time zone
<fmt:setTimeZone>	Specify time zone
<fmt:message>	Display Resource profile information
<fmt:requestEncoding>	Set the character encoding of the request

SQL tags

The JSTL SQL Tag Library provides a label that interacts with a relational database (Oracle,mysql,sql server, and so on). The syntax for referencing the SQL tag library is as follows:

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

label	Description
<sql:setDataSource>	Specify the data source
<sql:query>	Run the SQL query statement
<sql:update>	To run the SQL UPDATE statement
<sql:param>	To set a parameter in an SQL statement to a specified value
<sql:dateParam>	Sets the date parameter in the SQL statement to the specified Java.util.Date object value
<sql:transaction>	Provide nested database behavior elements in a shared database connection, and run all statements as a single transaction

XML tags

The JSTL XML tag library provides a label for creating and manipulating XML documents. The syntax for referencing the XML tag library is as follows:

<%@ taglib Prefix="x"            uri="Http://java.sun.com/jsp/jstl/xml" %>  

Before using XML tags, you must copy the XML and XPath related packages to your <tomcat installation directory >\lib:

• Xercesimpl.jar

  : http://www.apache.org/dist/xerces/j/

• Xalan.jar

  : http://xml.apache.org/xalan-j/index.html

label	Description
<x:out>	Similar to <%=, but only for XPath expressions
<x:parse>	Parsing XML Data
<x:set>	To set an XPath expression
<x:if>	Evaluates the XPath expression, if true, executes the contents of the ontology, otherwise skips the ontology
<x:forEach>	Iterate over a node in an XML document
<x:choose>	Parent tags for <x:when> and <x:otherwise>
<x:when>	<x:choose> Sub-tags for conditional judgment
<x:otherwise>	<x:choose> Sub-label, executed when <x:when> evaluates to False
<x:transform>	To apply an XSL transformation to an XML document
<x:param>	Work with <x:transform> to set up XSL style sheets

Jstl function

Jstl contains a series of standard functions, most of which are general-purpose string processing functions. The syntax for referencing the JSTL function library is as follows:

<%@ taglib Prefix="FN"            uri="Http://java.sun.com/jsp/jstl/functions" %> 

function	Description
Fn:contains ()	Tests whether the input string contains the specified substring
Fn:containsignorecase ()	Tests whether the input string contains the specified substring, is case insensitive
Fn:endswith ()	Tests whether the input string ends with the specified suffix
Fn:escapexml ()	Skipping characters that can be tagged as xml
Fn:indexof ()	Returns the position of the specified string where it appears in the input string
Fn:join ()	The elements in the array are composited into a string and then output
Fn:length ()	return string length
Fn:replace ()	Replaces the specified position in the input string with the specified string and returns
Fn:split ()	Separates the string with the specified delimiter and then composes a substring array and returns
Fn:startswith ()	Tests whether the input string starts with the specified prefix
Fn:substring ()	Returns a subset of a string
Fn:substringafter ()	Returns a subset of a string after a specified substring
Fn:substringbefore ()	Returns a subset of the string before the specified substring
Fn:tolowercase ()	Convert characters in a string to lowercase
Fn:touppercase ()	To capitalize characters in a string
Fn:trim ()	Remove the first white space character

Original link: http://www.runoob.com/jsp/jsp-jstl.html

Jstl Tag Library