java中常见XML解析器的使用详解(JAXP,DOM4J,Jsoup,JsoupXPath)

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

public class JAXP_DOMExample {
    public static void main(String[] args) throws Exception {
        // 创建DocumentBuilder对象
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();

        // 解析XML文档
        Document document = builder.parse("example.xml");

        // 获取根节点
        Element root = document.getDocumentElement();

        // 遍历子节点
        NodeList nodes = root.getElementsByTagName("book");
        for (int i = 0; i < nodes.getLength(); i++) {
            Element book = (Element) nodes.item(i);
            String title = book.getElementsByTagName("title").item(0).getTextContent();
            System.out.println("Title: " + title);
        }
    }
}

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.DefaultHandler;

public class JAXP_SAXExample {
    public static void main(String[] args) throws Exception {
        // 创建SAXParser对象
        SAXParserFactory factory = SAXParserFactory.newInstance();
        SAXParser parser = factory.newSAXParser();

        // 解析XML文档
        parser.parse("example.xml", new DefaultHandler() {
            @Override
            public void startElement(String uri, String localName, String qName, Attributes attributes) {
                if (qName.equals("title")) {
                    System.out.println("Title: " + qName);
                }
            }
        });
    }
}

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;
import java.io.FileInputStream;

public class JAXP_StAXExample {
    public static void main(String[] args) throws Exception {
        // 创建XMLStreamReader对象
        XMLInputFactory factory = XMLInputFactory.newFactory();
        XMLStreamReader reader = factory.createXMLStreamReader(new FileInputStream("example.xml"));

        // 解析XML文档
        while (reader.hasNext()) {
            int eventType = reader.next();
            if (eventType == XMLStreamReader.START_ELEMENT && reader.getLocalName().equals("title")) {
                System.out.println("Title: " + reader.getElementText());
            }
        }

        // 关闭XMLStreamReader
        reader.close();
    }
}

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class DOM4JExample {
    public static void main(String[] args) throws DocumentException {
        // 创建SAXReader对象
        SAXReader reader = new SAXReader();

        // 解析XML文档
        Document document = reader.read("example.xml");

        // 获取根节点
        Element root = document.getRootElement();

        // 遍历子节点
        List<Element> books = root.elements("book");
        for (Element book : books) {
            String title = book.elementText("title");
            System.out.println("Title: " + title);
        }
    }
}

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class JsoupExample {
    public static void main(String[] args) throws Exception {
        // 解析XML文档
        Document document = Jsoup.parse("example.xml", "UTF-8");

        // 选取元素
        Elements books = document.select("book");
        for (Element book : books) {
            String title = book.selectFirst("title").text();
            System.out.println("Title: " + title);
        }
    }
}

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.NodeTraversor;
import org.jsoup.select.NodeVisitor;
import us.codecraft.xsoup.XPathEvaluator;
import us.codecraft.xsoup.Xsoup;

public class JsoupXPathExample {
    public static void main(String[] args) throws Exception {
        // 解析XML文档
        Document document = Jsoup.parse("example.xml", "UTF-8");

        // 使用XPath选择器
        XPathEvaluator evaluator = Xsoup.compile("//book/title");
        NodeTraversor.traverse(new NodeVisitor() {
            @Override
            public void head(Element element, int depth) {
                if (element.tagName().equals("title")) {
                    System.out.println("Title: " + element.text());
                }
            }

            @Override
            public void tail(Element element, int depth) {
            }
        }, document);
    }
}