java怎么读取xml配置文件

在Java中，读取XML配置文件有多种方法，其中比较常用的是使用DOM解析器或者SAX解析器。

import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import org.w3c.dom.Document;import org.w3c.dom.NodeList;import org.w3c.dom.Node;import org.w3c.dom.Element;// 加载XML配置文件DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse("config.xml");// 获取根节点Element root = document.getDocumentElement();// 获取子节点NodeList nodeList = root.getChildNodes();for (int i = 0; i < nodeList.getLength(); i++) {Node node = nodeList.item(i);if (node.getNodeType() == Node.ELEMENT_NODE) {Element element = (Element) node;// 处理节点数据String name = element.getAttribute("name");String value = element.getTextContent();System.out.println(name + ": " + value);}}

import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;// 创建SAX解析器SAXParserFactory factory = SAXParserFactory.newInstance();SAXParser parser = factory.newSAXParser();// 创建处理器DefaultHandler handler = new DefaultHandler() {boolean bName = false;boolean bValue = false;@Overridepublic void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {if (qName.equalsIgnoreCase("name")) {bName = true;}if (qName.equalsIgnoreCase("value")) {bValue = true;}}@Overridepublic void characters(char[] ch, int start, int length) throws SAXException {if (bName) {String name = new String(ch, start, length);System.out.println("Name: " + name);bName = false;}if (bValue) {String value = new String(ch, start, length);System.out.println("Value: " + value);bValue = false;}}};// 解析XML配置文件parser.parse("config.xml", handler);

以上是两种常见的读取XML配置文件的方法，你可以根据自己的需求选择适合的方法来读取和处理XML配置文件中的数据。