JAVA DOM操作

最新推荐文章于 2023-07-12 11:45:08 发布

最新推荐文章于 2023-07-12 11:45:08 发布 · 119 阅读

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package com.hunau.example.dom;

import java.io.File;
import java.io.IOException;

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;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

/*
* Author:pidty
* Discription:using dom to builid a xml file
* Time:2011-4-18
*/
public class DomDemo {

    //创建xml文档
    public static void createXmlFile(DocumentBuilder dBuilder){

        //得到文档对象
        Document doc = dBuilder.newDocument();
        //创建文档根节点
        Element root = doc.createElement("User");
        //创建一级子节点
        Element user1 = doc.createElement("user");
        user1.setAttribute("id", "001");

        Element user2 = doc.createElement("user");
        user2.setAttribute("id", "002");

        //创建二级子节点
        Element name1 = doc.createElement("姓名");
        Element age1 = doc.createElement("年龄");
        Element sex1 = doc.createElement("性别");

        Element name2 = doc.createElement("姓名");
        Element age2 = doc.createElement("年龄");
        Element sex2 = doc.createElement("性别");

        //将二级节点设置值
        name1.appendChild(doc.createTextNode("pidty"));
        age1.appendChild(doc.createTextNode("20"));
        sex1.appendChild(doc.createTextNode("男"));

        name2.appendChild(doc.createTextNode("keary"));
        age2.appendChild(doc.createTextNode("22"));
        sex2.appendChild(doc.createTextNode("女"));

        //将二级子节点添加到一级子节点中
        user1.appendChild(name1);
        user1.appendChild(age1);
        user1.appendChild(sex1);

        user2.appendChild(name2);
        user2.appendChild(age2);
        user2.appendChild(sex2);

        //将一级子节点添加到根节点
        root.appendChild(user1);
        root.appendChild(user2);

        //将根节点添加到文档中
        doc.appendChild(root);

        //调用写入方法，将doc写到磁盘
        writeXmlFile(doc,new File("1.xml"));
    }

    //为id为001的节点添加pid属性
    public static void addAttribute(DocumentBuilder dBuilder){
        Document doc = null;
        try {
            doc = dBuilder.parse(new File("1.xml"));
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //得到文档的根元素
        Element root = doc.getDocumentElement();

        //得到一级子节点的所有节点
        NodeList userList = doc.getElementsByTagName("user");
        Element userElement = null;
        for(int i=0;i<userList.getLength();i++){
            userElement = (Element)userList.item(i);
            if(userElement.getAttribute("id").equals("001")){
                userElement.setAttribute("pid", "123");
            }
        }
        //重新将修改后的节点添加到根节点中
        root.appendChild(userElement);

        //调用写入方法
        writeXmlFile(doc,new File("2.xml"));
    }

    //将创建的XML文件写入磁盘
    public static void writeXmlFile(Document doc,File file){
        //获得工厂方法
        TransformerFactory tFactory = TransformerFactory.newInstance();

        try {
            //获得Transformer实例
            Transformer transformer = tFactory.newTransformer();
            //调用写入方法
            transformer.transform(new DOMSource(doc), new StreamResult(file));
        } catch (TransformerConfigurationException e) {
            e.printStackTrace();
        } catch (TransformerException e) {
            e.printStackTrace();
        }
    }

    //修改id为001的节点的id属性
    public static void modifyAttribute(DocumentBuilder dBuilder){
        Document doc = null;
        try {
        doc = dBuilder.parse("1.xml");
        } catch (SAXException e) {
        e.printStackTrace();
        } catch (IOException e) {
        e.printStackTrace();
        }
        Element root = doc.getDocumentElement();
        NodeList userList = doc.getElementsByTagName("user");
        Element userElement = null;
        for(int i=0;i<userList.getLength();i++){
            userElement = (Element)userList.item(i);
            if(userElement.getAttribute("id").equals("001")){
                //修改id值为001的属性
                userElement.setAttribute("id", "101");
            }
        }
        root.appendChild(userElement);
        //调用writeXmlFile()
        writeXmlFile(doc, new File("3.xml"));
    }

    //删除id为001的节点的id属性
    public static void removeAttribute(DocumentBuilder dBuilder){
        Document doc = null;
        try {
            doc = dBuilder.parse("1.xml");
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        Element root = doc.getDocumentElement();
        NodeList userList = doc.getElementsByTagName("user");
        Element userElement = null;
        for(int i=0;i<userList.getLength();i++){
            userElement = (Element)userList.item(i);
            if(userElement.getAttribute("id").equals("001")){
                //删除id值为001的属性
                userElement.removeAttribute("id");
            }
        }
        root.appendChild(userElement);
        //调用writeXmlFile()
        writeXmlFile(doc, new File("4.xml"));
    }

    //修改id为001的age值
    public static void modifyNodeValue(DocumentBuilder dBuilder){
        Document doc = null;
        try {
            doc = dBuilder.parse("1.xml");
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        Element root = doc.getDocumentElement();
        NodeList userList = doc.getElementsByTagName("user");
        Element userElement = null;
        for(int i=0;i<userList.getLength();i++){
            userElement = (Element)userList.item(i);
            if(userElement.getAttribute("id").equals("001")){
                //获得叶子节点值
                String nodeValue = userElement.getElementsByTagName("年龄").item(0).getFirstChild().getNodeValue();
                System.out.println(nodeValue);

                userElement.getElementsByTagName("年龄").item(0).getFirstChild().setNodeValue("30");
            }
        }
        //调用writeXmlFile()
        writeXmlFile(doc, new File("5.xml"));
    }

    //增加id为001的节点的子节点（电话）
    public static void addNode(DocumentBuilder dBuilder){
        Document doc = null;
        try {
            doc = dBuilder.parse("1.xml");
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        Element root = doc.getDocumentElement();
        Element tel = doc.createElement("电话");
        tel.appendChild(doc.createTextNode("13856234569"));

        NodeList userList = doc.getElementsByTagName("user");
        Element userElement = null;
        for(int i=0;i<userList.getLength();i++){
            userElement = (Element)userList.item(i);
            if(userElement.getAttribute("id").equals("001")){
                userElement.appendChild(tel);
            }
        }
        root.appendChild(userElement);
        //调用writeXmlFile()
        writeXmlFile(doc, new File("6.xml"));
    }
    public static void main(String[] args) {
        //生成DocumentBuilderFactory实例
        DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        //生成DocumentBuilder实例
        DocumentBuilder dBuilder = null;
        try {
            dBuilder = dbFactory.newDocumentBuilder();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        }
        //1.调用createXmlFile()方法
//        createXmlFile(dBuilder);
        //2.为一级子节点添加属性
//        addAttribute(dBuilder);
        //3.修改一级子节点属性值
//        modifyAttribute(dBuilder);
        //4.删除一级子节点属性值
//        removeAttribute(dBuilder);
        //5.修改id值为001的age的值
//        modifyNodeValue(dBuilder);
        //6.为id值为001的user节点添加子节点tel
        addNode(dBuilder);

        System.out.println("完成操作");
    }
}