遍历元素属性节点实例

package csdn.xml.dom;

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.Attr;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.NodeList;

import org.w3c.dom.Node;

import org.w3c.dom.Text;

import java.io.File;

public class MyDomTest {

public static void main(String[] args) throws Exception {

//获得工厂对象

DocumentBuilderFactory factory =

DocumentBuilderFactory.newInstance();

//获得解析器

DocumentBuilder builder = factory.newDocumentBuilder();

//进行解析，获得Document对象

Document doc = builder.parse(new File("src/book.xml"));

//顺序访问节点的方式找到书架节点

// NodeList nodeList = doc.getChildNodes().item(0).getChildNodes();

// System.out.println("书架的子节点数量："+nodeList.getLength());

//随机访问已知元素名称的指定节点

// NodeList nodeList = doc.getElementsByTagName("书架");

// Node node = nodeList.item(0);

// listAllNodes(node);

//插入新节点

// createNode(doc);

//在指定位置前插入新节点

insertFixedNode(doc);

}

//对指定的节点进行遍历

public static void listAllNodes(Node node){

System.out.println("节点名："+node.getNodeName()

+ " 节点值: "+node.getNodeValue());

if(node.getNodeType() == Node.ELEMENT_NODE){

//遍历当前元素节点的属性

if(node.hasAttributes()){

NamedNodeMap attrs = node.getAttributes();

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

Node attrNode = attrs.item(i);

System.out.println(attrNode.getNodeName() +

" : "+attrNode.getNodeValue());

}

}

//遍历当前元素节点的子结点，利用递归实现

if(node.hasChildNodes()){

NodeList nodeList = node.getChildNodes();

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

Node childNode = nodeList.item(i);

listAllNodes(childNode); //递归

}

}

}

}

public static void createNode(Document doc) throws TransformerException{

Node node = doc.getElementsByTagName("书").item(1);

Element element = doc.createElement("出版社");

element.setTextContent("西安交大出版社");

node.appendChild(element);

TransformerFactory factory = TransformerFactory.newInstance();

Transformer transformer = factory.newTransformer();

transformer.transform(new DOMSource(doc), new StreamResult(new File("src/book.xml")));

}

public static void insertFixedNode(Document doc) throws Exception{

Node secBookNode = doc.getElementsByTagName("书").item(1);

Node priceNode = secBookNode.getChildNodes().item(4);

Element isbnElement = doc.createElement("ISBN");

Text isbnText = doc.createTextNode("123-345-333");

isbnElement.appendChild(isbnText);

// secBookNode.appendChild(isbnElement); //追加为secBookNode最后一个子结点

//插入到售价节点之前

secBookNode.insertBefore(isbnElement, priceNode);

TransformerFactory factory = TransformerFactory.newInstance();

Transformer transformer = factory.newTransformer();

transformer.transform(new DOMSource(doc), new StreamResult(new File("src/book.xml")));

}

}