XPath解析xml文件例子

package com.xpath.test;

import java.io.File;
import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

/**
 * @description 使用JDOM包中的XPath解析xml文件
 * @author Zhou-Jingxian
 *
 */
public class XPathSample {
 public static void main(String[] args) {
  try {
   DocumentBuilderFactory factory = DocumentBuilderFactory
     .newInstance();

   factory.setNamespaceAware(true);

   DocumentBuilder builder = factory.newDocumentBuilder();

   File file = new File(XPathSample.class.getResource("Book.xml").getFile());
   //"D:/J2EE/studyspace_6.0/XPathSample/books.xml"
   Document doc = (Document) builder.parse(file);

   XPathFactory xFactory = XPathFactory.newInstance();

   XPath xpath = xFactory.newXPath();

   String booknames = xpath.evaluate("/books/book[2]/name", doc);
   System.out.println(booknames);
   
   String expression = "";
//   expression = "//book[name='Thinking in Java']";
   expression = "//book";
   XPathExpression expr = xpath.compile(expression);

   Object result = expr.evaluate(doc, XPathConstants.NODESET);

   NodeList nodes = (NodeList) result;

   for (int i = 0; i < nodes.getLength(); i++) {
    Node node = nodes.item(i);
    System.out.println(node.getBaseURI() + "--"
      + node.getLocalName() + "--" + node.getNamespaceURI()
      + "--" + node.getNodeName() + "--" + node.getNodeType()
      + "--" + node.getPrefix() + "--"
      + node.getTextContent() + "--" + node.getAttributes()
      + "--" + node.getOwnerDocument() + "--"
      + node.getParentNode() + "--"
      + nodes.item(i).getNodeValue());
   }
  } catch (XPathExpressionException e) {
   e.printStackTrace();
  } catch (ParserConfigurationException e) {
   e.printStackTrace();
  } catch (SAXException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }

 }
}

Book.xml和XPathSample同目录

<?xml version="1.0" encoding="UTF-8"?>
<books>
	<book>
	    <name>Java Core II</name>
	    <price>119.00RMB</price>
	</book>
	
	<book>
	    <name>Effective Java</name>
	    <price>52.00RMB</price>
	</book>
	
	<book>
	    <name>Thinking in Java</name>
	    <price>108.00RMB</price>
	</book>
</books>
 

在 http://www.jdom.org/可以下载JDOM的最新版本，将压缩包中的jdom.jar及lib目录下的全部jar包加入到classpath就可以了。 (附件上传了一个1.1.1的jdom包)

 

更多XPath讲解请看http://www.ibm.com/developerworks/cn/xml/x-jdom/

评论

2 楼 zjx2388 2011-08-24  

多谢TenAclock提醒，是写反位置了

1 楼 TenAclock 2011-08-16  

首先感谢楼主的分享，赫赫，我也是刚学习这个Xpath ，
你提供的xml文件好像有一点的问题应该是第一行写错位置了吧

引用

<pre name="code" class="Book.xml"><?xml version="1.0" encoding="UTF-8"?>

是应该

<?xml version="1.0" encoding="UTF-8"?>
<pre name="code" class="Book.xml">

更符合标准一些的。