Java的xpath示例程序
代码示例来源于：http://www.ibm.com/developerworks/xml/library/x-javaxpathapi.html
books.xml
XpahtSample/
src/
com.zhanjh.xpath
XmlFile/
books.xml
books.xml
1 <?xml version="1.0" encoding="UTF-8"?>
2 <inventory>
3 <book year="2000">
4 <title>Snow Crash</title>
5 <author>Neal Stephenson</author>
6 <publisher>Spectra</publisher>
7 <isbn>0553380958</isbn>
8 <price>14.95</price>
9 </book>
10
11 <book year="2005">
12 <title>Burning Tower</title>
13 <author>Larry Niven</author>
14 <author>Jerry Pournelle</author>
15 <publisher>Pocket</publisher>
16 <isbn>0743416910</isbn>
17 <price>5.99</price>
18 </book>
19
20 <book year="1995">
21 <title>Zodiac</title>
22 <author>Neal Stephenson</author>
23 <publisher>Spectra</publisher>
24 <isbn>0553573862</isbn>
25 <price>7.50</price>
26 </book>
27
28 <!-- more books![]()
-->
29
30 </inventory>
2 <inventory>
3 <book year="2000">
4 <title>Snow Crash</title>
5 <author>Neal Stephenson</author>
6 <publisher>Spectra</publisher>
7 <isbn>0553380958</isbn>
8 <price>14.95</price>
9 </book>
10
11 <book year="2005">
12 <title>Burning Tower</title>
13 <author>Larry Niven</author>
14 <author>Jerry Pournelle</author>
15 <publisher>Pocket</publisher>
16 <isbn>0743416910</isbn>
17 <price>5.99</price>
18 </book>
19
20 <book year="1995">
21 <title>Zodiac</title>
22 <author>Neal Stephenson</author>
23 <publisher>Spectra</publisher>
24 <isbn>0553573862</isbn>
25 <price>7.50</price>
26 </book>
27
28 <!-- more books
-->29
30 </inventory>
1 package com.zhanjh.xpath;
2
3 import java.io.IOException;
4
5 import javax.xml.parsers.*;
6 import javax.xml.xpath.*;
7
8 import org.w3c.dom.*;
9 import org.xml.sax.SAXException;
10
11 class XpathSample {
12 public static void main(String[] args) throws ParserConfigurationException,
13 SAXException, IOException, XPathExpressionException {
14 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
15 factory.setNamespaceAware(true);
16 DocumentBuilder builder = factory.newDocumentBuilder();
17 Document doc = builder.parse("XmlFile/books.xml");
18 XPathFactory xFactory = XPathFactory.newInstance();
19 XPath xpath = xFactory.newXPath();
20 XPathExpression expr = xpath
21 .compile("//book[author='Neal Stephenson']/price/text()");
22 Object result = expr.evaluate(doc, XPathConstants.NODESET);
23 NodeList nodes = (NodeList) result;
24 for (int i = 0; i < nodes.getLength(); i++) {
25 System.out.println(nodes.item(i).getNodeValue());
26 }
27 }
28
29 }
30
文件结构：2
3 import java.io.IOException;
4
5 import javax.xml.parsers.*;
6 import javax.xml.xpath.*;
7
8 import org.w3c.dom.*;
9 import org.xml.sax.SAXException;
10
11 class XpathSample {
12 public static void main(String[] args) throws ParserConfigurationException,
13 SAXException, IOException, XPathExpressionException {
14 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
15 factory.setNamespaceAware(true);
16 DocumentBuilder builder = factory.newDocumentBuilder();
17 Document doc = builder.parse("XmlFile/books.xml");
18 XPathFactory xFactory = XPathFactory.newInstance();
19 XPath xpath = xFactory.newXPath();
20 XPathExpression expr = xpath
21 .compile("//book[author='Neal Stephenson']/price/text()");
22 Object result = expr.evaluate(doc, XPathConstants.NODESET);
23 NodeList nodes = (NodeList) result;
24 for (int i = 0; i < nodes.getLength(); i++) {
25 System.out.println(nodes.item(i).getNodeValue());
26 }
27 }
28
29 }
30
XpahtSample/
src/
com.zhanjh.xpath
XmlFile/
books.xml
posted @ 2007-12-11 16:06 zhanjh 阅读(2871) 评论(1) 推荐(0)
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