Java中使用DOM方式解析和创建XML文档、及dom4j使用简介

来源：互联网发布：东北师范大学知乎编辑：程序博客网时间：2024/05/22 10:53

1.解析XML文档
Java代码

package peixun;import java.io.File;import java.io.IOException;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import org.xml.sax.SAXException;public class ReadXML {    public static void main(String[] args) {        try {            //DOM方式解析XML文档            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();//调用DocumentBuilderFactory类，使用DocumentBuilderFactory的静态方法获取一个新的实例            DocumentBuilder builder = factory.newDocumentBuilder();            Document document = builder.parse(new File("languages.xml"));            Element root = document.getDocumentElement();            System.out.println("cat="+root.getAttribute("cat"));            NodeList list = root.getElementsByTagName("lan");            for (int i = 0; i < list.getLength(); i++) {                Element lan = (Element) list.item(i);                System.out.println("-------------------");                System.out.println("id="+lan.getAttribute("id"));                NodeList clist = lan.getChildNodes();                for (int j = 0; j < clist.getLength(); j++) {                    Node c = clist.item(j);//c instanceof Element是为了不输出不可见的字节                    if (c instanceof Element) {                        System.out.println(c.getNodeName()+"="+c.getTextContent());                    }                }            }            }            catch (SAXException e) {                e.printStackTrace();            }             catch (IOException e) {                e.printStackTrace();            }            catch (ParserConfigurationException e) {            e.printStackTrace();        }    }}

XML文档

<?xml version="1.0" encoding="UTF-8"?><Language cat="it">    <lan id="1">        <name>Java</name>        <ide>Eclipse</ide>    </lan>    <lan id="2">        <name>Swift</name>        <ide>Xcode</ide>    </lan>    <lan id="3">        <name>C#</name>        <ide>Visual Studio</ide>    </lan></Language>

2.创建XML文档
Java代码：

package peixun;import java.io.File;import java.io.StringWriter;import java.nio.file.Path;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerConfigurationException;import javax.xml.transform.TransformerException;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import org.w3c.dom.Document;import org.w3c.dom.Element;public class CreateXML {    public static void main(String[] args) {        try {            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();            DocumentBuilder builder = factory.newDocumentBuilder();            Document document = builder.newDocument();            Element root = document.createElement("Languages");            root.setAttribute("cat", "it");            Element lan1 = document.createElement("lan");            lan1.setAttribute("id", "1");            Element name1 = document.createElement("name");            name1.setTextContent("Swift");            Element ide1 = document.createElement("ide");            ide1.setTextContent("Xcode");            //name和ide添加到lan的子节点            lan1.appendChild(name1);            lan1.appendChild(ide1);            //lan节点添加到root节点下            root.appendChild(lan1);            //root添加到document中            document.appendChild(root);            Element lan2 = document.createElement("lan");            lan2.setAttribute("id", "2");            Element name2 = document.createElement("name");            name2.setTextContent("C#");            Element ide2 = document.createElement("ide");            ide2.setTextContent("Visual Studio");            //name和ide添加到lan的子节点            lan1.appendChild(name2);            lan1.appendChild(ide2);            //lan节点添加到root节点下            root.appendChild(lan2);            Element lan3 = document.createElement("lan");            lan3.setAttribute("id", "3");            Element name3 = document.createElement("name");            name3.setTextContent("Java");            Element ide3 = document.createElement("ide");            ide3.setTextContent("eclipse");            //name和ide添加到lan的子节点            lan1.appendChild(name3);            lan1.appendChild(ide3);            //lan节点添加到root节点下            root.appendChild(lan3);            //----------            TransformerFactory transformerFactory = TransformerFactory.newInstance();            //transformer将XML文档转化成其他格式            Transformer transformer = transformerFactory.newTransformer();            StringWriter writer = new StringWriter();            //字符流形式输出            transformer.transform(new DOMSource(document),new StreamResult(writer));            System.out.println(writer.toString());            //以文件形式输出            transformer.transform(new DOMSource(document),new StreamResult(new File("newxml.xml")));        } catch (ParserConfigurationException e) {            e.printStackTrace();        } catch (TransformerConfigurationException e) {            e.printStackTrace();        } catch (TransformerException e) {            e.printStackTrace();        }    }}

3.dom4j使用简介

package peixun;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.DocumentHelper;public class Testdom4j {    public static void main(String[] args) {        try {            String xmlString = "<root><people>Sai</people></root>";            //把xmlString字符串转换成document对象            Document document = DocumentHelper.parseText(xmlString);            //将document对象输出成字符串            System.out.println(document.asXML());        } catch (DocumentException e) {            e.printStackTrace();        }    }}

0 0