W3C解析  负责  XML

package com.itheima.xml;import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Iterator;
import java.util.Vector;import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
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;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;import com.itheima.xml.bean.Plant;public class TextW3CParseXML {/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stubString fileName="F:/plant.xml";  //已经存在的 xml文件TextW3CParseXML t=new TextW3CParseXML();try {Vector v=t.readXMLFile(fileName);Iterator it=v.iterator();while(it.hasNext()){Plant s=(Plant)it.next();System.out.println(s.getId()+"\t"+s.getName()+"\t"+s.getDesc());}} catch (Exception e) {// TODO: handle exceptionSystem.out.println("读取XML文件出错:"+e.getMessage());}String outfile="F:/plant1.xml";  //复制到这个文件中t.writeXMLFile(outfile);}Vector plant_Vector;private Vector readXMLFile(String fileName) throws Exception{//获取dom解析器的工厂实例 DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();DocumentBuilder build=dbf.newDocumentBuilder();Document doc=build.parse(fileName);Element root=doc.getDocumentElement();NodeList plantList=root.getElementsByTagName("plant");plant_Vector=new Vector();System.out.println(plantList.getLength());for (int i = 0; i < plantList.getLength(); i++) {Element element=(Element)plantList.item(i);Plant plant=new Plant();plant.setId(element.getAttribute("id"));NodeList names=element.getElementsByTagName("name");Element e=(Element)names.item(0);Node t=e.getFirstChild();plant.setName(t.getNodeValue());NodeList desc=element.getElementsByTagName("description");e=(Element)desc.item(0);t=e.getFirstChild();plant.setDesc(t.getNodeValue());plant_Vector.add(plant);}return plant_Vector;}//将文档写入到XML文件中public static void callWriteXmlFile(Document doc,Writer w,String encoding){try {Source source=new DOMSource(doc);Result result=new StreamResult(w); //创建结果对象Transformer transformer=TransformerFactory.newInstance().newTransformer(); //创建转换器transformer.setOutputProperty(OutputKeys.ENCODING, encoding);transformer.transform(source, result); //对文档进行转换} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}}//将 XML文件复制到指定文件private void writeXMLFile(String fileName){DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();DocumentBuilder builder=null;try {builder=dbf.newDocumentBuilder();} catch (ParserConfigurationException e) {// TODO Auto-generated catch blocke.printStackTrace();}Document doc=builder.newDocument();Element root=doc.createElement("plants");doc.appendChild(root);for (int i = 0; i < plant_Vector.size(); i++) {Plant plant=(Plant)plant_Vector.get(i);Element element=doc.createElement("plant");element.setAttribute("id", plant.getId());root.appendChild(element);Element name=doc.createElement("name");element.appendChild(name);Text tname=doc.createTextNode(plant.getName());name.appendChild(tname);Element desc=doc.createElement("description");element.appendChild(desc);Text tdesc=doc.createTextNode(plant.getDesc());desc.appendChild(tdesc);}try {FileOutputStream fos=new FileOutputStream(fileName);  //创建文件输出流OutputStreamWriter outWriter=new OutputStreamWriter(fos);callWriteXmlFile(doc, outWriter, "gb2312");outWriter.close();fos.close();} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}}}