初学jxtl标签

jxtl标签在web项目中用到的比较多,所以现在空闲,想初步了解一下。作下记录,方便以后学习。开始进入主题。

首先使用jxtl标签时,必须在jsp头部引用它,即  <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>.

下面分别对这些标签进行说明:

1. <c:out> 用来显示数据对象(字符串、表达式)的内容或结果

使用Java脚本的方式为:<% out.println("hello") %>  <% =表达式 %>

使用JSTL标签:<c:out value="字符串">,例如:

 

<body>
  <c:out value="&lt要显示的数据对象(未使用转义字符)&gt" escapeXml="true" default="默认值"></c:out><br/>
  <c:out value="&lt要显示的数据对象(使用转义字符)&gt" escapeXml="false" default="默认值"></c:out><br/>
  <c:out value="${null}" escapeXml="false">使用的表达式结果为null,则输出该默认值</c:out><br/>
</body>

 

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

2.

  <c:set>标签的编写共有4种语法格式。
 
 语法1:存值,把一个值放在指定的域范围内。
    <c:set value=”值1” var=”name1” [scope=”page|request|session|application”]/>
    含义:把一个变量名为name1值为“值1”的变量存储在指定的scope范围内。
  语法2:
    <c:set var=”name2” [scope=”page|request|session|application”]>
      值2
    </c:set>
    含义:把一个变量名为name2,值为值2的变量存储在指定的scope范围内。
  语法3:
    <c:set value=”值3” target=”JavaBean对象” property=”属性名”/>
    含义:把一个值为“值3”赋值给指定的JavaBean的属性名。相当与setter()方法。
  语法4:
    <c:set target=”JavaBean对象” property=”属性名”>
      值4
    </c:set>
    含义:把一个值4赋值给指定的JavaBean的属性名。
  从功能上分语法1和语法2、语法3和语法4的效果是一样的,只是把value值放置的位置不同,至于使用那个根据个人的喜爱,语法1和语法2是向scope范围内存储一个值,语法3和语法4是给指定的JavaBean赋值。

<c:set> 用于将变量存取于 JSP 范围中或 JavaBean 属性中。下面的例子中假设已经有 Person.java 这个类文件。

 

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@page contentType="text/html; charset=utf-8" %>

<jsp:useBean id="person" class="lihui.Person"></jsp:useBean>

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>JSTL测试</title>
  </head>
  
  <body>
  <c:set value="张三" var="name1" scope="session"></c:set>
  <c:set var="name2" scope="session">李四</c:set>
  <c:set value="赵五" target="${person}" property="name"></c:set>
  <c:set target="${person}" property="age">19</c:set>
  <li>从session中得到的值:${sessionScope.name1}</li>
  <li>从session中得到的值:${sessionScope.name2}</li>
  <li>从Bean中获取对象person的name值:<c:out value="${person.name}"></c:out></li>
  <li>从Bean中获取对象person的age值:<c:out value="${person.age}"></c:out></li>
  </body>
</html>

 

 

3.<c:if>条件判断

<c:if test="条件1" var="name" [scope="page|request|session|application"]></c:if>

把条件1的结果(true或者false)存到var变量中,范围有以上四个。

4. <c:choose> <c:when> <c:otherwise> 三个标签通常嵌套使用,第一个标签在最外层,最后一个标签在嵌套中只能使用一次

 

 <c:set var="score">85</c:set>
    <c:choose>
    <c:when test="${score>=90}">
    你的成绩为优秀!
    </c:when>
    <c:when test="${score>=70&&score<90}">
    您的成绩为良好!
    </c:when>
    <c:when test="${score>60&&score<70}">
    您的成绩为及格
    </c:when>
    <c:otherwise>
    对不起,您没有通过考试!
    </c:otherwise>
    </c:choose>

 

5.最常用的<c:forEach>循环标签

语法:<c:forEach var="name" items="Collection" varStatus="statusName" begin="begin" end="end" step="step"></c:forEach>

其中, var 用于存储从集合中取出的元素;items 指定要遍历的集合;varStatus 用于存放集合中元素的信息begin表示循环的开始,end表示结束,这两个一般用于分页。

具体用法:

1 <%@ page contentType="text/html;charset=utf-8" %>
2 <%@page import="java.util.List"%>
3 <%@page import="java.util.ArrayList"%>
4 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
5 <html>
6 <head>
7     <title>JSTL: -- forEach标签实例</title>
8 </head>
9 <body>
10 <h4><c:out value="forEach实例"/></h4>
11 <hr>
12     <% 
13         List a=new ArrayList();
14         a.add("贝贝");
15         a.add("晶晶");
16         a.add("欢欢");
17         a.add("莹莹");
18         a.add("妮妮");
19     request.setAttribute("a",a);
20 %>
21     <B><c:out value="不指定begin和end的迭代:" /></B><br>
22     <c:forEach var="fuwa" items="${a}">
23     &nbsp;<c:out value="${fuwa}"/><br>     《!--如果a装的是对象集合可以直接用  对象.getxxx()方法获得属性值--》
24     </c:forEach>
25     <B><c:out value="指定begin和end的迭代:" /></B><br>
26     <c:forEach var="fuwa" items="${a}" begin="1" end="3" step="2">
27     &nbsp;<c:out value="${fuwa}" /><br>
28     </c:forEach>
29     <B><c:out value="输出整个迭代的信息:" /></B><br>
30     <c:forEach var="fuwa" items="${a}" begin="3" end="4" step="1" varStatus="s">
31     &nbsp;<c:out value="${fuwa}" />的四种属性:<br>
32     &nbsp;&nbsp;所在位置,即索引:<c:out value="${s.index}" /><br>
33     &nbsp;&nbsp;总共已迭代的次数:<c:out value="${s.count}" /><br>
34     &nbsp;&nbsp;是否为第一个位置:<c:out value="${s.first}" /><br>
35     &nbsp;&nbsp;是否为最后一个位置:<c:out value="${s.last}" /><br>
36     </c:forEach>
37 </body>
38 </html>

 

posted on 2015-01-21 21:23  缘非缘  阅读(1411)  评论(0编辑  收藏  举报