java dom读写xml文件_Java创建以及读写xml文档（dom方式）

package myXML;

import org.w3c.dom.*;

import org.xml.sax.*;

import java.io.*;

import javax.xml.parsers.*;

import javax.xml.transform.*;

import javax.xml.transform.dom.*;

import javax.xml.transform.stream.*;

public class myXML {

/**

* @param args

*/

private Document document = null;

public void createXml(String fileName)

{//创建xml文档

try

{

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

DocumentBuilder db = dbf.newDocumentBuilder();

this.document = db.newDocument();//创建xml与解析xml不同的地方

document.normalize();

}

catch(ParserConfigurationException e)

{

System.out.println(e.getMessage());

}

Element root = this.document.createElement("krpano");//创建根节点

this.document.appendChild(root);

TransformerFactory tf = TransformerFactory.newInstance();

try

{

Transformer transformer = tf.newTransformer();

DOMSource source = new DOMSource(document);

PrintWriter pw = new PrintWriter(new FileOutputStream(fileName));

StreamResult result = new StreamResult(pw);

transformer.transform(source, result);

System.out.println("生成XML文件成功");

}

catch(TransformerConfigurationException e)

{

System.out.println(e.getMessage());

}

catch(IllegalArgumentException e)

{

System.out.println(e.getMessage());

}

catch(FileNotFoundException e)

{

System.out.println(e.getMessage());

}

catch(TransformerException e)

{

System.out.println(e.getMessage());

}

}

public void parserXML(String fileName)

{//解析xml文档

try

{

try

{

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

DocumentBuilder db = dbf.newDocumentBuilder();

this.document = db.parse(fileName); //解析xml与创建xml不同的地方

this.document.normalize();

//Document document = db.parse(fileName);

}

catch(ParserConfigurationException e)

{

System.out.println(e.getMessage());

}

NodeList employees = document.getChildNodes();

for(int i = 0; i < employees.getLength(); i++)

{

Node employee = employees.item(i);

NodeList employeeInfo =employee.getChildNodes();

for(int j = 0; j < employeeInfo.getLength(); j++)

{

Node node = employeeInfo.item(j);

NodeList employeeMeta = node.getChildNodes();

for(int k = 0;k < employeeMeta.getLength(); k++)

{

System.out.println(employeeMeta.item(k).getNodeName() + ":" + employeeMeta.item(k).getTextContent());

}

}

}

System.out.println("解析完毕");

}

catch(FileNotFoundException e)

{

System.out.println(e.getMessage());

}

catch(SAXException e)

{

System.out.println(e.getMessage());

}

catch(IOException e)

{

System.out.println(e.getMessage());

}

}

public void addNode(String fileName, String nodeName, String fatherNodeName)

{//在一指定的xml文档中，父节点下添加一个节点

try

{

//得到DOM解析器的工厂实例

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

//从DOM工厂里获取DOM解析器

DocumentBuilder db = dbf.newDocumentBuilder();

//解析XML文档，得到document, 即DOM树

this.document = db.parse(fileName);

//去掉XML文档中作为格式化内容的空白而映射在DOM树中的不必要的Text Node对象

this.document.normalize();

//创建一个标签

Element myname =document.createElement(nodeName);//创建一个节点

//myname.setAttribute("name", "xxxx");//为该标签添加名字属性

//Element mybook=document.createElement("mybook");

//mybook.setAttribute("id", "Date Structure");

//mybook.setAttribute("name", "423");

//添加父子关系

//myname.appendChild(mybook);

//将标签添加到父标签里

Element fatherElement=(Element)document.getElementsByTagName(fatherNodeName).item(0);

fatherElement.appendChild(myname);

//保存xml文档

TransformerFactory transformerFactory = TransformerFactory.newInstance();

Transformer transformer = transformerFactory.newTransformer();

DOMSource source = new DOMSource(document);

//设置编码类型

transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");

StreamResult result = new StreamResult(new FileOutputStream(fileName));

//把DOM树转换为xml文档

transformer.transform(source, result);

System.out.println("节点添加完毕");

}

catch(Exception e)

{

System.out.println(e.getMessage());

}

}

public static void main(String[] args) {

// TODO Auto-generated method stub

myXML dd=new myXML();

String XMLName="D:/mykrpano.xml";

//创建xml文档

dd.createXml(XMLName);

//解析xml文档

//dd.parserXML(str);

dd.addNode(XMLName, "image", "krpano");

}

}