Table of Contents
 
一 概述" >一 概述
1.什么是JSTL? " > 1.什么是JSTL?
二 表达式标签 " >二 表达式标签
三 URL标签" >三 URL标签
四 流程控制标签" >四 流程控制标签
 1.条件判断标签 " >  1.条件判断标签
2.条件选择标签" > 2.条件选择标签
五 循环标签" >五 循环标签
1.简单循环标签 " > 1.简单循环标签
2.迭代标签" > 2.迭代标签
Home Java javaTutorial Summary of JSTL related knowledge points

Summary of JSTL related knowledge points

Jul 18, 2017 pm 03:14 PM
javascript Summarize

 

一 概述

1.什么是JSTL?

JSP Standard Taglib,一个定义了一系列标签的标签库,以取代在JSP页面中嵌套的java代码,经常与EL结合使用,使页面风格统一,维护方便。
    JSTL标签都是成对出现的。

二 表达式标签

 主要用于向作用域范围添加属性、获取属性、移除属性。作用范围从小到大依次为page默认page。

  • :用于将表达式的值输出到JSP页面。

  •   :向作用域范围添加属性。

  •   :用于删除指定作用域范围内的属性。

  •   :用于捕获异常,并将异常存储在指定的属性中。

  • 三 URL标签

    •  :用于导入站内或者站外资源。

    •   :生产一个url路径,用于赋值。

    •   :页面重定向。

    •   :用于在页面重定向时传递请求参数。

    四 流程控制标签

     1.条件判断标签

    <c:if test="表达式"var="res"[scope=""]>标签体</c:if>
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    条件成立执行标签体。

    2.条件选择标签

    <c:choose> <c:when test="">标签体</c:when> <c:when test="">标签体</c:when>  ...................     <c:otherwise>标签体</c:otherwise></c:choose>
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    从多个条件中选择一个执行。

    五 循环标签

    1.简单循环标签

    <c:forEach items="sup"var="sub"begin=""end=""step=""varStatus="">标签体</c:forEach>
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    • items:需要遍历的对象,通常通过EL表达式获取。

    • var:当前遍历子对象,即被遍历对象的一个元素。

    • begin:遍历开始的索引位置。

    • end:遍历结束的索引位置。

    • step:每次遍历时采取的步数,即相邻两个遍历索引的差值。

    • varStatus:代表遍历状态的一个对象,通过该对象不仅可以判断当前遍历是否是第一次遍历,或者最后一次遍历,还可以获取当前索引值,遍历次数。

    遍历Map集合:

    <c:forEach items="map"var="entry">  ${entry.key}=&{entry.value}</c:forEach>
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    2.迭代标签

    <c:forTokens items=""var=""delims=""begin=""end=""step=""varStatus="">标签体</c:forTokens>
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    先分割,后遍历,分割可以采用多个分隔符,多个分隔符统一定义在delims中,紧凑排列,不加“,”,不留空格。

     

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