Java Reading XML using DOM parser

最新推荐文章于 2025-08-15 17:08:39 发布

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最新推荐文章于 2025-08-15 17:08:39 发布

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分类专栏： Java 文章标签： xml java interface attributes string exception

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本文介绍如何使用Java的DOM解析器读取并解析XML文件。通过具体示例展示了如何获取XML文档的根元素、遍历所有带有特定标签名的节点，并提取所需的数据。

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Document, Element and Attr Interface ALL extend from Node Interface.

The Document interface represents the entire HTML or XML document. Conceptually, it is the root of the document tree, and provides the primary access to the document's data.

The Element interface represents an element in an HTML or XML document. Elements may have attributes associated with them;

book.xml - the XML file to be read

<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
	<book>
		<title>DST</title>
		<publisher>ORiley</publisher>
		<price>10.00</price>
	</book>
	<book>
		<title>News</title>
		<publisher>NYT</publisher>
		<price>12.00</price>
	</book>
</bookstore>

ReadXML.java - reads book.xml

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;

import java.io.File;

public class ReadXML {

	public static void main(String[] args) {
		try {
			File fXmlFile = new File("book.xml");
			DocumentBuilderFactory dbFactory = DocumentBuilderFactory
					.newInstance();
			DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
			Document doc = dBuilder.parse(fXmlFile);
			doc.getDocumentElement().normalize();

			// get root element
			System.out.println("Root element : "
					+ doc.getDocumentElement().getNodeName());
			
			// node list with tag ame "book"
			NodeList nList = doc.getElementsByTagName("book");

			for (int i = 0; i < nList.getLength(); i++) {
				// get a node from node list
				Node node = nList.item(i);

				// if the node is an element, print its title, publisher, price
				if (node.getNodeType() == Node.ELEMENT_NODE) {
					Element eElement = (Element) node;

					System.out.println("title: "
							+ getTagValue("title", eElement));
					System.out.println("publisher: "
							+ getTagValue("publisher", eElement));
					System.out.println("price: "
							+ getTagValue("price", eElement));
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	// read the tag value from an Element
	private static String getTagValue(String tag, Element elem) {
		NodeList nList = elem.getElementsByTagName(tag).item(0).getChildNodes();
		Node nValue = (Node) nList.item(0);
		return nValue.getNodeValue();

	}
}

Reference:

http://www.mkyong.com/java/how-to-read-xml-file-in-java-dom-parser/

http://docs.oracle.com/javase/1.4.2/docs/api/org/w3c/dom/Node.html

http://docs.oracle.com/javase/1.4.2/docs/api/org/w3c/dom/Element.html

http://docs.oracle.com/javase/1.4.2/docs/api/org/w3c/dom/Document.html