jstl

核心标签:

核心组的标签是最常用的JSTL标签。以下是在您的JSP的语法包括JSTL核心库：

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

有以下核心JSTL标签：

TagDescription<c:out >和<%= ... >标签一样功能, 但对于表达式。<c:set >设置表达式求值的结果在一个'范围'<c:remove >删除一个范围的变量（从一个特定的范围内，如果已指定）。<c:catch>Catches any Throwable that occurs in its body and optionally exposes it.<c:if>Simple conditional tag which evalutes its body if the supplied condition is true.<c:choose>Simple conditional tag that establishes a context for mutually exclusive conditional operations, marked by <when> and <otherwise><c:when>Subtag of <choose> that includes its body if its condition evalutes to 'true'.<c:otherwise >Subtag of <choose> that follows <when> tags and runs only if all of the prior conditions evaluated to 'false'.<c:import>Retrieves an absolute or relative URL and exposes its contents to either the page, a String in 'var', or a Reader in 'varReader'.<c:forEach >The basic iteration tag, accepting many different collection types and supporting subsetting and other functionality .<c:forTokens>Iterates over tokens, separated by the supplied delimeters.<c:param>Adds a parameter to a containing 'import' tag's URL.<c:redirect >Redirects to a new URL.<c:url>Creates a URL with optional query parameters

格式化标签：

使用JSTL格式标签来格式化和显示文本，日期，时间和数字的，国际化的网站。以下是在您的JSP的语法，包括格式化库：

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

以下是格式化JSTL标签列表：

TagDescription<fmt:formatNumber>To render numerical value with specific precision or format.<fmt:parseNumber>Parses the string representation of a number, currency, or percentage.<fmt:formatDate>Formats a date and/or time using the supplied styles and pattern<fmt:parseDate>Parses the string representation of a date and/or time<fmt:bundle>Loads a resource bundle to be used by its tag body.<fmt:setLocale>Stores the given locale in the locale configuration variable.<fmt:setBundle>Loads a resource bundle and stores it in the named scoped variable or the bundle configuration variable.<fmt:timeZone>Specifies the time zone for any time formatting or parsing actions nested in its body.<fmt:setTimeZone>Stores the given time zone in the time zone configuration variable<fmt:message>To display an internationalized message.<fmt:requestEncoding>Sets the request character encoding

SQL标签:

JSTL的SQL标签库标签可以交互关系型数据库（如Oracle，MySQL或Microsoft SQL Server的关系数据库管理系统）。

以下是在您的JSP语法包括JSTL SQL库：

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

以下是SQL JSTL标签的列表：

TagDescription<sql:setDataSource>Creates a simple DataSource suitable only for prototyping<sql:query>Executes the SQL query defined in its body or through the sql attribute.<sql:update>Executes the SQL update defined in its body or through the sql attribute.<sql:param>Sets a parameter in an SQL statement to the specified value.<sql:dateParam>Sets a parameter in an SQL statement to the specified java.util.Date value.<sql:transaction >Provides nested database action elements with a shared Connection, set up to execute all statements as one transaction.

XML 标签:

JSTL XML标记提供了一种创建和操作XML文档的JSP为中心的方式。以下是在您的JSP的语法包括JSTL XML库。

JSTL XML标记库具有自定义标签与XML数据交互。这包括XML解析，转换XML数据，流控制，基于XPath表达式。

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

在继续之前的例子中，将需要复制下面的两个XML和XPath相关的库到<Tomcat安装目录> 的\lib目录：

1. XercesImpl.jar: 下载地址 http://www.apache.org/dist/xerces/j/

2. xalan.jar: 下载地址 http://xml.apache.org/xalan-j/index.html

以下是XML JSTL标签列表：

TagDescription<x:out>Like <%= ... >, but for XPath expressions.<x:parse>Use to parse XML data specified either via an attribute or in the tag body.<x:set >Sets a variable to the value of an XPath expression.<x:if >Evaluates a test XPath expression and if it is true, it processes its body. If the test condition is false, the body is ignored.<x:forEach>To loop over nodes in an XML document.<x:choose>Simple conditional tag that establishes a context for mutually exclusive conditional operations, marked by <when> and <otherwise><x:when >Subtag of <choose> that includes its body if its expression evalutes to 'true'<x:otherwise >Subtag of <choose> that follows <when> tags and runs only if all of the prior conditions evaluated to 'false'<x:transform >Applies an XSL transformation on a XML document<x:param >Use along with the transform tag to set a parameter in the XSLT stylesheet

JSTL 函数:

JSTL包括一些标准功能，其中大部分是常见的字符串操作函数。以下是在JSP的语法包函JSTL函数库：

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

以下是JSTL函数列表：

FunctionDescriptionfn:contains()Tests if an input string contains the specified substring.fn:containsIgnoreCase()Tests if an input string contains the specified substring in a case insensitive way.fn:endsWith()Tests if an input string ends with the specified suffix.fn:escapeXml()Escapes characters that could be interpreted as XML markup.fn:indexOf()Returns the index withing a string of the first occurrence of a specified substring.fn:join()Joins all elements of an array into a string.fn:length()Returns the number of items in a collection, or the number of characters in a string.fn:replace()Returns a string resulting from replacing in an input string all occurrences with a given string.fn:split()Splits a string into an array of substrings.fn:startsWith()Tests if an input string starts with the specified prefix.fn:substring()Returns a subset of a string.fn:substringAfter()Returns a subset of a string following a specific substring.fn:substringBefore()Returns a subset of a string before a specific substring.fn:toLowerCase()Converts all of the characters of a string to lower case.fn:toUpperCase()Converts all of the characters of a string to upper case.fn:trim()Removes white spaces from both ends of a string.

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