我们可以在JSP中测试XPath表达式吗？
<X：如果>标签计算一个测试XPath表达式，并且如果它是真实的，它处理它的身体。如果测试条件为假，则忽略主体。
属性
<X：如果>标签具有以下属性-
示例
以下是显示<x：if>标记用法的示例-
<%@ 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:if 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 = "${xmltext}" var = "output"/>
<x:if select = "$output//book">
Document has at least one <book> element.
</x:if>
<br />
<x:if select = "$output/books[1]/book/price > 100">
Book prices are very high
</x:if>
</body>
</html>现在让我们访问上面的JSP，将显示以下结果-
Books Info: Document has at least one <book> element. Book prices are very high