JSP 中是否可以为 XPath 表达式添加 switch 语句?
<x:choose> 标签的工作方式类似于 Java switch 语句。通过此标签,您可以在多个备选方案之间进行选择。switch 语句包含 case 语句,而 <x:choose> 标签包含 <x:when> 标签。类似地,switch 语句具有 default 子句来指定默认操作,而 <x:choose> 标签具有 <x:otherwise> 标签作为默认子句。
属性
<x:choose> 标签没有任何属性。
<x:when> 标签有一个属性,如下所示。
<x:otherwise> 标签没有任何属性。
将显示以下结果 −属性 描述 Required Default select Condition to evaluate Yes None 示例
<%@ taglib prefix = "c" uri = "http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix = "x" uri = "http://java.sun.com/jsp/jstl/xml" %>
<html>
<head>
<title>JSTL x:choose Tags</title>
</head>
<body>
<h3>Books Info:</h3>
<c:set var = "xmltext">
<books>
<book>
<name>Padam History</name>
<author>ZARA</author>
<price>100</price>
</book>
<book>
<name>Great Mistry</name>
<author>NUHA</author>
<price>2000</price>
</book>
</books>
</c:set>
<x:parse xml = "${xmltext}" var = "output"/>
<x:choose>
<x:when select = "$output//book/author = 'ZARA'">
Book is written by ZARA
</x:when>
<x:when select = "$output//book/author = 'NUHA'">
Book is written by NUHA
</x:when>
<x:otherwise>
Unknown author.
</x:otherwise>
</x:choose>
</body>
</html>
Books Info:
Book is written by ZARA
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