JSTL XML <x:parse> 解析xml 的Tag标签

最新推荐文章于 2023-06-24 22:56:47 发布

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最新推荐文章于 2023-06-24 22:56:47 发布

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分类专栏： Java 文章标签： XML JSP Tomcat SUN C#

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本文介绍如何利用JSTL中的<x:parse>标签来解析XML数据，并通过实例展示了如何读取并解析外部XML文件的内容。该方法适用于需要处理XML数据的Web应用程序。

The <x:parse> tag is used to parse XML data specified either via an attribute or in the tag body.

准备所必须的jar 包以下三个jar包缺一不可:

jstl.jar

standard.jar

xalan-2.7.1.jar

将这些jar包放在tomcat 服务器器下的 webapps\ project 下的 \WEB-INF\lib 里即可

books.xml 和 test.jsp放在同一目录

Attribute:

The <x:parse> tag has following attributes:

Attribute	Description	Required	Default
var	A variable that contains the parsed XML data	No	None
xml	Text of the document to parse (String or Reader)	No	Body
systemId	The system identifier URI for parsing the document	No	None
filter	The filter to be applied to the source document	No	None
doc	XML document to be parsed	No	Page
scope	Scope of the variable specified in the var attribute.	No	Page
varDom	A variable that contains the parsed XML data.	No	Page
scopeDom	Scope of the variable specified in the varDom attribute.	No	Page

Example:

Following example shows how parse can be used to read external XML file and it can be parsed:

We have seen how we can parse XML from the body of the given document. Now let us put following content in books.xml file:

<?xml version="1.0" encoding="GBK"?>
<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>
 <book number="index1"> 
  <values-list>
	 <values>
		  <value>hello</value>
		  <value>jason</value>
		  <value>2000</value>
		  <value>www.baidu.com</value>
	 </values>
	 <values>
		  <value>hello</value>
		  <value>jason</value>
		  <value>2000</value>
		  <value>www.goole.com</value>
	 </values>
  </values-list>
</book>
</books>

Now try the following test.jsp, keeping in the same directory:

<%@ 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:parse Tags</title>
</head>
<body>
<h3>Books Info:</h3>
<c:import var="bookInfo" url="books.xml"/>

<x:parse xml="${bookInfo}" var="rss"/>
<b>The title of the first book is</b>: 
<x:out select="$rss/books/book[1]/name" />
<br>
<b>The price of the second book</b>: 
<x:out select="$rss/books/book[2]/price" />

<br>
	<x:forEach varStatus="status" select="$rss/books/book[@number='index1']/values-list/values">
       <li>
	   <a href="<x:out select="value[4]" escapeXml="false"/>" target="_blank">
		<x:out select="value[4]" />
	   </a>
	   </li>
      </x:forEach>
</body>
</html>

Now try to access above JSP using http://localhost:8080/test.jsp, this would produce following result:

Books Info:
The title of the first book is: Padam History 
The price of the second book: 2000 

www.baidu.com 
www.goole.com