DOM解析XML文档(深度与广度)
解析方式一：
package cn.com.csuinfosoft.dom;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* title:dom parser xml
* @author Administrator
*
*/
public class ParserDom {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try{
//1:创建DocumentBuilderFactory
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
//2:DocumentBuilder
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
//3:加载XML文档在内存中生成文档树
Document document = documentBuilder.parse( "bookinfo.xml" );
//获取根节点 bookinfo
Element root = document.getDocumentElement();
//获取所有子节点集合
NodeList bookList = root.getElementsByTagName( "book" );
NodeList bookName = root.getElementsByTagName( "bookname" );
NodeList author = root.getElementsByTagName( "author" );
NodeList price = root.getElementsByTagName( "price" );
NodeList age = root.getElementsByTagName( "age" );
NodeList type = root.getElementsByTagName( "type" );
for( int i = 0; i < bookList.getLength();i++ ){
Node bookNode = bookList.item( i );
//获取属性
System.out.println( "id:"+bookNode.getAttributes().getNamedItem( "id" ).getTextContent() );
//获取内容
System.out.println( "bookname:"+bookName.item( i ).getTextContent() );
System.out.println( "author:"+author.item( i ).getTextContent() );
System.out.println( "price:"+price.item( i ).getTextContent() );
System.out.println( "age:"+age.item( i ).getTextContent() );
System.out.println( "type:"+type.item( i ).getTextContent() );
System.out.println( "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++" );
}
}catch( Exception e ){
e.printStackTrace();
}
}
}
解析方式二：
package cn.com.csuinfosoft.dom;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
/**
* title:dom parser xml
* @author Administrator
*
*/
public class TestDom {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
//1:创建DocumentBuilderFactory
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
//2:DocumentBuilder
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
//3:加载XML文档在内存中生成文档树
Document document = documentBuilder.parse( "bookinfo.xml" );
//获取根节点 bookinfo
Element root = document.getDocumentElement();
//获取根节点下的第一级子节点集合 book
NodeList nodeList = root.getChildNodes();
System.out.println( "nodeList length:"+nodeList.getLength() );
for( int i = 0; i < nodeList.getLength(); i++ ){
Node node = nodeList.item( i );
//System.out.println( "nodeName:"+node.getNodeName() +" nodeType:"+node.getNodeType() );
//处理book节点，
if( node.getNodeType() == Node.ELEMENT_NODE ){
//获取book节点中的id属性值
System.out.println( "id:"+node.getAttributes().getNamedItem( "id" ).getTextContent() );
//获取book节点下的子节点集合
NodeList childList = node.getChildNodes();
for( int j = 0; j < childList.getLength(); j++ ){
Node childNode = childList.item( j );
//处理book下的子节点
if( childNode.getNodeType() == Node.ELEMENT_NODE ){
//输出内容
System.out.println( "nodeName:"+childNode.getNodeName() );
System.out.println( "nodeValue:"+childNode.getTextContent() );
System.out.println( "++++++++++++++++++++++++++++++++++++++++++++" );
}
}
}
}
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block ParserConfigurationException
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
输出XML文档：
package cn.com.csuinfosoft.dom;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
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;
/**
* title:构造XML，输出
* @author Administrator
*
*/
public class TransformerXml {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
//1:
DocumentBuilderFactory documentBuilderFacotry = DocumentBuilderFactory.newInstance();
//2:
DocumentBuilder documentBuilder = documentBuilderFacotry.newDocumentBuilder();
//Document创建一个空的文档树，然后添加数据
Document doc = documentBuilder.newDocument();
//Element 节点，标记
Element root = doc.createElement( "bookinfo" );//创建根节点
//创建book
Element book = doc.createElement( "book" );
//添加id属性
book.setAttribute( "id", "101" );
//bookname
Element bookname = doc.createElement( "bookname" );
//添加内容
bookname.setTextContent( "java编程思想" );
//appendChild
book.appendChild( bookname );
root.appendChild( book );
doc.appendChild( root );
//==================
//将树输出到xml文件在去
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
//Source
DOMSource source = new DOMSource( doc );
StreamResult result = new StreamResult( new FileOutputStream( "book.xml" ) );
//输出
transformer.transform( source, result );
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (TransformerConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (TransformerException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}