<?xml version="1.0" encoding="UTF-8"?>

 <user>

     <uname type="3">zhangsan</uname>

     <uname type="2">王麻子</uname>

     <uname>lisi</uname>

     <pwd>

         123456

         <abcd>

             aaaaaaa

             <uname type="3">zhaoliu</uname>

         </abcd>

         <uname>wangwu</uname>

     </pwd>

 </user>

 package com.xmldemo;

 import java.io.IOException;

 import java.io.InputStream;

 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.NodeList;

 import org.xml.sax.SAXException;

 public class DomTest {

     public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {

         //创建解析的工厂类

         DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();

         //创建解析

         DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();

         //获取user.xml的文件流 并且需要保证 xml放在src的根目录

         InputStream is = DomTest.class.getClassLoader().getResourceAsStream("user.xml");

         //创建文档对象模型

         Document document = documentBuilder.parse(is);

         //获取指定节点的集合

         NodeList nodeList = document.getElementsByTagName("uname");

         //遍历并获取

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

             Element element = (Element) nodeList.item(i);

             System.out.println(element.getTagName() + "----->" + element.getAttribute("type") + "---->" + element.getTextContent());

         }

     }

 }

 package com.xmldemo;

 import java.io.IOException;

 import java.io.InputStream;

 import java.util.ArrayList;

 import java.util.List;

 import javax.xml.parsers.ParserConfigurationException;

 import javax.xml.parsers.SAXParser;

 import javax.xml.parsers.SAXParserFactory;

 import org.xml.sax.Attributes;

 import org.xml.sax.SAXException;

 import org.xml.sax.helpers.DefaultHandler;

 public class SaxTest {

     public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {

         //创建解析器的工厂类

         SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();

         //创建解析器

         SAXParser saxParser = saxParserFactory.newSAXParser();

         //获取xml文件流

         InputStream is = SaxTest.class.getClassLoader().getResourceAsStream("user.xml");

         //创建自己的处理类

         MyHandle myHandle = new MyHandle();

         //直接进行解析

         saxParser.parse(is, myHandle);

         for (int i = 0; i < myHandle.list.size(); i++) {

             System.out.println("SaxTest.main()" + myHandle.list.get(i));

         }

     }

 }

 /**

  * 对XMl处理的方法

  * @author Bjsxt2013

  *

  */

 class MyHandle extends DefaultHandler {

     public List<String> list = new ArrayList<String>();

     private String elementName = null;

     @Override

     public void characters(char[] ch, int start, int length) throws SAXException {

         //System.out.println("MyHandle.characters()" + new String(ch, start, length));

         if (elementName != null && "uname".equals(elementName)) {

             //System.out.println(new String(ch, start, length));

             list.add(new String(ch, start, length));

         }

     }

     @Override

     public void endElement(String uri, String localName, String qName) throws SAXException {

         //System.out.println("MyHandle.endElement()" + qName);

         elementName = null;

     }

     @Override

     public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {

         //System.out.println("MyHandle.startElement()" + qName);

         elementName = qName;

     }

     @Override

     public void startDocument() throws SAXException {

         //System.out.println("MyHandle.startDocument()");

     }

     @Override

     public void endDocument() throws SAXException {

         //System.out.println("MyHandle.endDocument()");

     }

 }

 package com.xmldemo;

 import java.io.FileNotFoundException;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.io.InputStream;

 import java.util.List;

 import org.jdom.Attribute;

 import org.jdom.Document;

 import org.jdom.Element;

 import org.jdom.JDOMException;

 import org.jdom.input.SAXBuilder;

 import org.jdom.output.Format;

 import org.jdom.output.XMLOutputter;

 /**

  * 1.如何动态生成xml文件

  * 2.如何解析xml文件

  * 3.如何修改xml文件

  *

  * 如何快速的解析xml文件

  * @author Bjsxt2013

  *

  */

 public class JdomTest {

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

         String filePath = System.getProperty("user.dir") + "\\src\\create.xml";

         //System.out.println(filePath);

         //createXml(filePath);

         parserXml(filePath);

     }

     /**

      * 解析并修改XMl文件

      * @param filePath

      * @throws JDOMException

      * @throws IOException

      */

     public static void parserXml(String filePath) throws JDOMException, IOException {

         //创建JDom的解析器

         SAXBuilder saxBuilder = new SAXBuilder();

         //获取XML对象的流

         InputStream is = JdomTest.class.getClassLoader().getResourceAsStream("create.xml");

         //解析并生成document对象

         Document document = saxBuilder.build(is);

         //获取根节点

         Element rootElement = document.getRootElement();

         //修改根节点的属性

         rootElement.setAttribute("sno", "9999");

         rootElement.setAttribute("type01", "aaaaaaaaaaaaaa");

         Attribute type = new Attribute("type", "abcdefg");

         rootElement.setAttribute(type);

         //获取指定的子节点

         Element stuName = rootElement.getChild("stuName");

         Element abcd = stuName.getChild("abcd");

         //获取节点对应的值

         //System.out.println("JdomTest.parserXml()" + abcd.getText());

         abcd.setText("唐僧");

         //The attribute already has an existing parent "student"

         //abcd.setAttribute(type);

         //获取所有的子节点

         List<Element> list = rootElement.getChildren();

         for (int i = 0; i < list.size(); i++) {

             System.out.println("JdomTest.parserXml()" + list.get(i).getName());

         }

         //创建新的节点

         Element score = new Element("score");

         score.setText("99");

         rootElement.addContent(score);

         //再所有的节点之后设置文本内容  不能直接调用setText方法

         //rootElement.setText("abcdefghijklmn");

         rootElement.addContent("abcdefghij");

         //设置写出的格式

         Format format = Format.getPrettyFormat();//格式良好的

         //Format format = Format.getCompactFormat();//格式紧凑的

         format.setEncoding("utf-8");

         //将文档对象模型写出到硬盘

         XMLOutputter xmlOutputter = new XMLOutputter(format);

         xmlOutputter.output(document, new FileOutputStream(filePath));

     }

     /**

      * 创建一个XML文件

      * @param filePath

      * @throws FileNotFoundException

      * @throws IOException

      */

     public static void createXml(String filePath) throws FileNotFoundException, IOException {

         //创建学生节点(根节点)

         Element rootElement = new Element("student");

         //添加属性

         rootElement.setAttribute("sno", "201209888");

         //创建姓名节点

         Element stuName = new Element("stuName");

         //给姓名节点设置值

         stuName.setText("柳岩");

         //创建年龄节点

         Element age = new Element("age");

         age.setText("18");

         //将节点连起来

         rootElement.addContent(stuName);

         rootElement.addContent(age);

         //创建文档对象模型

         Document document = new Document(rootElement);

         //设置写出的格式

         Format format = Format.getPrettyFormat();//格式良好的

         //Format format = Format.getCompactFormat();//格式紧凑的

         format.setEncoding("utf-8");

         //将文档对象模型写出到硬盘

         XMLOutputter xmlOutputter = new XMLOutputter(format);

         xmlOutputter.output(document, new FileOutputStream(filePath));

     }

 }