dom操作xml

创建文件

package com.lq.xml;
import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
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;


//Dom操作除了可以进行解析之外还可以进行文件的生成
public class dom3{
    public static void main(String args[]){
        
        
        //取得DocumentBuilderFactory类的对象
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        //取得DocumentBuilder类的对象
        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            
            //创建一个新的xml文档
            Document doc =builder.newDocument();
            Element students = doc.createElement("students");
            Element student = doc.createElement("student");
            Element name = doc.createElement("name");
            Element sex = doc.createElement("sex");
            Element age = doc.createElement("age");
            
            //设置节点内容
            name.appendChild(doc.createTextNode("李伟"));
            sex.appendChild(doc.createTextNode("男"));
            age.appendChild(doc.createTextNode("23"));
            //设置各节点的关系
            //将节点name、sex、age设置为student的子节点
            student.appendChild(name);
            student.appendChild(sex);
            student.appendChild(age);
            //将student设置为students的子节点
            students.appendChild(student);
            //设置根节点
            doc.appendChild(students);

           
            //将文档内容保存在文件中 实例化传输器工厂
            TransformerFactory tf = TransformerFactory.newInstance();
            //创建一个具体的传输器
            Transformer transformer = tf.newTransformer();
            //设置输出编码
            transformer.setOutputProperty(OutputKeys.ENCODING, "utf-8");
            //准备输出文档
            DOMSource source = new DOMSource(doc);
            //设置输出的文件地址
            StreamResult result = new StreamResult(new File("dom2.xml"));
            //文件传输
            transformer.transform(source, result);
            
            
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (TransformerConfigurationException e) {
            e.printStackTrace();
        } catch (TransformerException e) {
            e.printStackTrace();
        } 
        
        //对于dom操作既可以读取也可以输出和修改,更多的操作在于读取
        
        
    }
}