DOM解析XML和生成

这里写代码片
package com.tangyuedi.xml.dom;

public interface IHolderXML {

    void createXMLByDOM();

    void parseXMLByDOM();

}
————————————————————————————————————————
package com.tangyuedi.xml.dom;

import java.io.Serializable;

public class EmployeeEntity implements Serializable{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private int id;
    private String name;
    private String age;
    private String sex;

    public EmployeeEntity() {
        super();
        // TODO Auto-generated constructor stub
    }
    public EmployeeEntity(int id, String name, String age, String sex) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
        this.sex = sex;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }

    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return super.toString();
    }


}
——————————————————————————————————————————

package com.tangyuedi.xml.dom;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;


import java.util.Iterator;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
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.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;


public class XMLHolderImpl implements IHolderXML{
    private Document mDocument;
    private static XMLHolderImpl instance;
    private static DocumentBuilder mDocumentBuilder;

    private void DocumentBuilderInit(){
        DocumentBuilderFactory mFactory = DocumentBuilderFactory.newInstance();
        try {
            mDocumentBuilder = mFactory.newDocumentBuilder();
            this.mDocument = mDocumentBuilder.newDocument();
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    private XMLHolderImpl(){
        DocumentBuilderInit();
    }

    public static XMLHolderImpl newInstance(){
        if (instance == null){
            synchronized(XMLHolderImpl.class){
                if(instance == null){
                    instance = new XMLHolderImpl();
                }
            }
        }
        return instance;
    }

    public void createXMLByDOM() {
        // TODO Auto-generated method stub
        Element rootElement = mDocument.createElement("root");//根
        mDocument.appendChild(rootElement);

        Element employeeElement = mDocument.createElement("employee");
        Attr attributElement = mDocument.createAttribute("id");
        attributElement.appendChild(mDocument.createTextNode("1"));
        employeeElement.setAttributeNode(attributElement);
        Element nameElement = mDocument.createElement("name");
        nameElement.appendChild(mDocument.createTextNode("张三"));

        Element ageElement = mDocument.createElement("age");
        ageElement.appendChild(mDocument.createTextNode("26"));

        Element sexElement = mDocument.createElement("sex");
        sexElement.appendChild(mDocument.createTextNode("男"));

        employeeElement.appendChild(nameElement);
        employeeElement.appendChild(ageElement);
        employeeElement.appendChild(sexElement);
        rootElement.appendChild(employeeElement);

        Element employeeElement1 = mDocument.createElement("employee");
        Attr attributElement1 = mDocument.createAttribute("id");
        attributElement1.appendChild(mDocument.createTextNode("2"));
        employeeElement1.setAttributeNode(attributElement1);
        Element nameElement1 = mDocument.createElement("name");
        nameElement1.appendChild(mDocument.createTextNode("李四"));

        Element ageElement1 = mDocument.createElement("age");
        ageElement1.appendChild(mDocument.createTextNode("27"));

        Element sexElement1 = mDocument.createElement("sex");
        sexElement1.appendChild(mDocument.createTextNode("男"));

        employeeElement1.appendChild(nameElement1);
        employeeElement1.appendChild(ageElement1);
        employeeElement1.appendChild(sexElement1);
        rootElement.appendChild(employeeElement1);

        TransformerFactory tf = TransformerFactory.newInstance(); 
        try {
            Transformer transformer = tf.newTransformer();
            DOMSource mDomSource = new DOMSource(mDocument);
            transformer.setOutputProperty(OutputKeys.ENCODING, "GB2312");
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            PrintWriter pw = new PrintWriter(new FileOutputStream("F:/tangyuedi.xml"));
            StreamResult result = new StreamResult(pw);
            transformer.transform(mDomSource, result);
            System.out.println("生成XML文件成功!");

        } 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();
        }
    }

    public void print(String xmlFile){
        System.out.println();
        System.out.print(xmlFile);
    }

    public String obtainXMLFileContent(){
        File mFile = new File("F:/tangyuedi.xml");
        BufferedReader bufferedReader = null;
        String line;
        StringBuffer buffer = new StringBuffer();
        FileInputStream fileInputStream = null;
        InputStream in = null;
        FileInputStream mFileInputStream = null;
        try {
            mFileInputStream = new FileInputStream(mFile);
        } catch (FileNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

        InputStreamReader inputStreamReader = new InputStreamReader(mFileInputStream);
        bufferedReader = new BufferedReader(inputStreamReader);
        try {
            while ((line = bufferedReader.readLine()) != null){
                 buffer.append(line);
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            try {
                bufferedReader.close();
            } catch (Exception e){
                e.printStackTrace();
            }
        }
        return buffer.toString();
    }

    public void parseXMLByDOM() {
        // TODO Auto-generated method stub

        ArrayList<EmployeeEntity> entityList = new ArrayList<EmployeeEntity>();


        try {
            Document mDoc = mDocumentBuilder.parse(new File("F:/tangyuedi.xml"));
            Element rootElement = mDoc.getDocumentElement();
            System.out.println("_rootElement >>> " + rootElement.getTagName());

            NodeList nodeList = rootElement.getElementsByTagName("employee");
            System.out.println("_nodeList >>> " + nodeList.getLength());
            for (int i = 0; i < nodeList.getLength(); i++){

                System.out.println("_getNodeName >>> " + nodeList.item(i).getNodeName()
                        + " _getNodeValue >>> " + nodeList.item(i).getNodeValue() 
                        + " _getNodeType >>> " + nodeList.item(i).getNodeType());

                EmployeeEntity employeeEntity = new EmployeeEntity();
                Node node = nodeList.item(i);
                System.out.println("_node >>> " + node.getNodeName());
                NamedNodeMap attr = node.getAttributes();// 获取属性，可能有多个属性
                if (attr != null){
                    for (int ii = 0; ii < attr.getLength(); ii++){
                        System.out.println("_attr.item(ii).getNodeName() >>> " + attr.item(ii).getNodeName());
                        int id = Integer.parseInt(attr.item(ii).getNodeValue());
                        employeeEntity.setId(id);
                    }
                }
                NodeList mNodeList = node.getChildNodes();
                System.out.println("_mNodeList >>> " +  mNodeList.getLength());
                for (int iii = 0; iii < mNodeList.getLength(); iii++){
                    if (mNodeList.item(iii).getNodeName().equals("name")){
                        employeeEntity.setName(mNodeList.item(iii).getTextContent());
                    }
                    if (mNodeList.item(iii).getNodeName().equals("age")){
                        employeeEntity.setAge(mNodeList.item(iii).getTextContent());
                    }
                    if (mNodeList.item(iii).getNodeName().equals("sex")){
                        System.out.println("_getNodeValue() >>> " +  mNodeList.item(iii).getNodeValue());
                        employeeEntity.setSex(mNodeList.item(iii).getTextContent());
                    }
                }
                entityList.add(employeeEntity);

            }

        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        printParseXML(entityList);
    }

    public void printParseXML(ArrayList<EmployeeEntity> entityList){
        Iterator<EmployeeEntity> iterator = entityList.iterator();

        while (iterator.hasNext()){
            EmployeeEntity employeeEntity = (EmployeeEntity) iterator.next();
            System.out.println("Employee " + "/ " + "_id >>> " + employeeEntity.getId() 
                    + " _age >>> " + employeeEntity.getAge() 
                    + " _name >>> " + employeeEntity.getName() 
                    + " _sex >>> " + employeeEntity.getSex());
        }
    }

}