java怎么读取xml文件内容

在Java中读取XML文件内容有多种方法，以下是两种常见的方法：

1. 使用DOM解析器：

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;  public class ReadXMLUsingDOM {    public static void main(String[] args) {       try {          File inputFile = new File("input.xml");          DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();          DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();          Document doc = dBuilder.parse(inputFile);          doc.getDocumentElement().normalize();          System.out.println("根元素：" + doc.getDocumentElement().getNodeName());          NodeList nodeList = doc.getElementsByTagName("student");          for (int temp = 0; temp < nodeList.getLength(); temp++) {             Node node = nodeList.item(temp);             System.out.println("\n当前元素：" + node.getNodeName());             if (node.getNodeType() == Node.ELEMENT_NODE) {                Element element = (Element) node;                System.out.println("学号：" + element.getAttribute("id"));                System.out.println("姓名：" + element.getElementsByTagName("name").item(0).getTextContent());                System.out.println("年龄：" + element.getElementsByTagName("age").item(0).getTextContent());                System.out.println("性别：" + element.getElementsByTagName("gender").item(0).getTextContent());             }          }       } catch (Exception e) {          e.printStackTrace();       }    } } 

2. 使用SAX解析器：

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;  public class ReadXMLUsingSAX {    public static void main(String[] args) {       try {          File inputFile = new File("input.xml");          SAXParserFactory factory = SAXParserFactory.newInstance();          SAXParser saxParser = factory.newSAXParser();          DefaultHandler handler = new DefaultHandler() {             boolean bName = false;             boolean bAge = false;             boolean bGender = false;              public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {                if (qName.equalsIgnoreCase("name")) {                   bName = true;                }                if (qName.equalsIgnoreCase("age")) {                   bAge = true;                }                if (qName.equalsIgnoreCase("gender")) {                   bGender = true;                }             }              public void endElement(String uri, String localName, String qName) throws SAXException {                if (qName.equalsIgnoreCase("student")) {                   System.out.println();                }             }              public void characters(char ch[], int start, int length) throws SAXException {                if (bName) {                   System.out.println("姓名：" + new String(ch, start, length));                   bName = false;                }                if (bAge) {                   System.out.println("年龄：" + new String(ch, start, length));                   bAge = false;                }                if (bGender) {                   System.out.println("性别：" + new String(ch, start, length));                   bGender = false;                }             }          };          saxParser.parse(inputFile, handler);       } catch (Exception e) {          e.printStackTrace();       }    } } 

这两种方法分别使用DOM解析器和SAX解析器来解析XML文件，可以根据需要选择使用的解析器。