Java USES xpath to parse XML sample shares
- 2020-04-01 03:13:00
- OfStack
XPath is known as XML Path Language, which is a Language used to locate parts of an XML document. XPath is an xml-based tree structure that provides the ability to find nodes in a data structure tree. XPath was originally conceived as a generic syntax model between XPointer and XSL. But XPath was quickly adopted by developers as a small query language.
XPathTest. Java
package com.hongyuan.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.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;
public class XPathTest {
public static void main(String[] args) throws ParserConfigurationException,
SAXException, IOException, XPathExpressionException {
//Parse the file to generate the document object
DocumentBuilder builder = DocumentBuilderFactory.newInstance()
.newDocumentBuilder();
Document document = builder.parse(new File("bookstore.xml"));
//Generate XPath objects
XPath xpath = XPathFactory.newInstance().newXPath();
//Get node value
String webTitle = (String) xpath.evaluate(
"/bookstore/book[@category='WEB']/title/text()", document,
XPathConstants.STRING);
System.out.println(webTitle);
System.out.println("===========================================================");
//Gets the node property value
String webTitleLang = (String) xpath.evaluate(
"/bookstore/book[@category='WEB']/title/@lang", document,
XPathConstants.STRING);
System.out.println(webTitleLang);
System.out.println("===========================================================");
//Get node object
Node bookWeb = (Node) xpath.evaluate(
"/bookstore/book[@category='WEB']", document,
XPathConstants.NODE);
System.out.println(bookWeb.getNodeName());
System.out.println("===========================================================");
//Get node set
NodeList books = (NodeList) xpath.evaluate("/bookstore/book", document,
XPathConstants.NODESET);
for (int i = 0; i < books.getLength(); i++) {
Node book = books.item(i);
System.out.println(xpath.evaluate("@category", book,
XPathConstants.STRING));
}
System.out.println("===========================================================");
}
}
XML bookstore.
<?xml version="1.0" encoding="utf-8" ?>
<bookstore>
<book category="COOKING">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="CHILDREN">
<title lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="WEB">
<title lang="en">Learning XML</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore>
Running effect
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