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java实现解析XML的4种方式

1、DOM方式解析

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package XMLParse;
 
import com.sun.scenario.effect.impl.sw.sse.SSEBlend_SRC_OUTPeer;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
 
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
 
public class domXML {
    //利用element方式
    public static void element(NodeList list) {
        for (int i = 0; i < list.getLength(); i++) {
            Element element = (Element) list.item(i);
            NodeList childNode = element.getChildNodes();
            for (int j = 0; j < childNode.getLength(); i++) {
                if (childNode.item(j).getNodeType() == Node.ELEMENT_NODE) {
                    //获取节点
                    System.out.print(childNode.item(j).getNodeName() + ":");
                    //获取节点数值
                    System.out.println(childNode.item(j).getFirstChild().getNodeValue());
                }
            }
        }
    }
 
    public static void node(NodeList list) {
        for (int i = 0; i < list.getLength(); i++) {
            Node node = list.item(i);
            NodeList childNodes = node.getChildNodes();
            for (int j = 0; j < childNodes.getLength(); j++) {
                if (childNodes.item(j).getNodeType() == Node.ELEMENT_NODE) {
                    System.out.print(childNodes.item(j).getNodeName() + ": ");
                    System.out.println(childNodes.item(j).getFirstChild().getNodeValue());
                }
            }
        }
    }
 
    public static void main(String[] args) {
        //创建这个对象
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        //创建下面这个对象
        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse("src/XMLParse/test.xml");
            NodeList list = document.getElementsByTagName("student");
            node(list);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

 

2、SAX方式解析

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package XMLParse;
 
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
 
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
 
public class saxXML {
    public static void main(String[] args) throws Exception {
        //获取sax实例对象
        SAXParserFactory factory = SAXParserFactory.newInstance();
        //获取SAXParse实例
        SAXParser saxParser = factory.newSAXParser();
        //创建handle对象
        SAXDemoHandel handel = new SAXDemoHandel();
        saxParser.parse("src/XMLParse/test.xml", handel);
    }
}
 
class SAXDemoHandel extends DefaultHandler {
    //遍历XML文件开始的标签
    @Override
    public void startDocument() throws SAXException {
        super.startDocument();
        System.out.println("sax解析开始...");
    }
 
    //遍历XML文件结束标签
    @Override
    public void endDocument() throws SAXException {
        super.endDocument();
        System.out.println("sax解析结束...");
    }
 
    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        super.startElement(uri, localName, qName, attributes);
        if (qName.equals("student")) {
            System.out.println("===开始遍历student===");
        } else if (!qName.equals("student") && !qName.equals("class")) {
            System.out.println("节点名称:" + qName + "----");
        }
    }
 
    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        super.endElement(uri, localName, qName);
        if (qName.equals("student")) {
            System.out.println(qName + "遍历结束");
            System.out.println("===结束遍历student===");
        }
    }
 
    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        super.characters(ch, start, length);
        String value = new String(ch, start, length).trim();
        if (!value.equals("")) {
            System.out.println(value);
        }
    }
}

 

3、JDOM方式解析

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package XMLParse;
 
 
import sun.plugin.dom.core.Document;
import sun.plugin.dom.core.Element;
 
import javax.print.attribute.Attribute;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.List;
 
 
/**
* @Author: mac
* JDom解析xml
* 快速开发XML应用程序。
* 是一个开源项目
* JDOM主要用来弥补DOM和SAX在实际应用当中的不足。
*/
public class JDomDemo {
    public static void main(String[] args) throws Exception {
        //1.创建SAXBuilder对象
        SAXBuilder saxBuilder = new SAXBuilder();
        //2.创建输入流
        InputStream is = new FileInputStream(new File("src/main/resources/demo.xml"));
        //3.将输入流加载到build中
        Document document = saxBuilder.build(is);
        //4.获取根节点
        Element rootElement = document.getRootElement();
        //5.获取子节点
        List<Element> children = rootElement.getChildren();
        for (Element child : children) {
            System.out.println("通过rollno获取属性值:" + child.getAttribute("rollno"));
            List<Attribute> attributes = (List<Attribute>) child.getAttributes();
            //打印属性
            for (Attribute attr : attributes) {
                System.out.println(attr.getName() + ":" + attr.getValue());
            }
            List<Element> childrenList = child.getChildren();
            System.out.println("======获取子节点-start======");
            for (Element o : childrenList) {
                System.out.println("节点名:" + o.getName() + "---" + "节点值:" + o.getValue());
            }
            System.out.println("======获取子节点-end======");
        }
    }
}

 

4、Dom4j方式解析

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import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
 
import java.io.File;
import java.util.Iterator;
import java.util.List;
 
/**
* @Author: cxx
* Dom4j解析xml
* @Date: 2018/5/30 12:21
*/
public class Dom4JDemo {
    public static void main(String[] args) throws Exception {
        //1.创建Reader对象
        SAXReader reader = new SAXReader();
        //2.加载xml
        Document document = reader.read(new File("src/main/resources/demo.xml"));
        //3.获取根节点
        Element rootElement = document.getRootElement();
        Iterator iterator = rootElement.elementIterator();
        while (iterator.hasNext()){
            Element stu = (Element) iterator.next();
            List<Attribute> attributes = stu.attributes();
            System.out.println("======获取属性值======");
            for (Attribute attribute : attributes) {
                System.out.println(attribute.getValue());
            }
            System.out.println("======遍历子节点======");
            Iterator iterator1 = stu.elementIterator();
            while (iterator1.hasNext()){
                Element stuChild = (Element) iterator1.next();
                System.out.println("节点名："+stuChild.getName()+"---节点值："+stuChild.getStringValue());
            }
        }
    }
}

 

from:https://blog.csdn.net/qq_42544728/article/details/125913216

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