DOM模型的XML文件生成读取

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import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.Text;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.Attr;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.OutputKeys;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamResult;

import java.util.Properties;

import java.io.FileOutputStream;

import java.io.File;

public class WriteRead {

public WriteRead() {

}

String FILE_NAME = "my.xml";

public void CreateXMLFile() throws Exception {

//生成Document

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

DocumentBuilder dbr = dbf.newDocumentBuilder();

Document doc = dbr.newDocument();

//添加内容

//根节点：

Element root = doc.createElement("Root");

root.setAttribute("att1", "Hello");

root.setAttribute("att2", "World");

Text rootText = doc.createTextNode("RootDate");

root.appendChild(rootText);

doc.appendChild(root);

//子节点：

Element child = doc.createElement("Child");

child.setAttribute("att1", "Hello");

child.setAttribute("att2", "Earth");

Text childText = doc.createTextNode("ChildDate");

child.appendChild(childText);

root.appendChild(child);

//孙子节点：

Element grandchild = doc.createElement("GrandChild");

grandchild.setAttribute("att1", "Hello");

grandchild.setAttribute("att2", "Lover");

Text grandchildText = doc.createTextNode("GrandChildDate");

grandchild.appendChild(grandchildText);

child.appendChild(grandchild);

//生成文件

TransformerFactory tff = TransformerFactory.newInstance();

Transformer tfr = tff.newTransformer();

Properties pts = tfr.getOutputProperties();

pts.setProperty(OutputKeys.ENCODING, "GBK");

tfr.setOutputProperties(pts);

tfr.transform(new DOMSource(doc),

new StreamResult(new FileOutputStream(FILE_NAME, false)));

}

public void ReadXMLFile() throws Exception {

//读取XML文件

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

DocumentBuilder dbr = dbf.newDocumentBuilder();

File file = new File(FILE_NAME);

Document doc = dbr.parse(file);

Element root = doc.getDocumentElement();

//顺序读取所有节点及属性

System.out.println("The root element is:" + root.getNodeName());

NodeList children = root.getChildNodes();

System.out.println("There are " + children.getLength() +

" nodes in this document.");