一、前言
Jdom是什么?
Jdom是一个开源项目,基于树形结构,利用纯java的技术对
Jdom的优点:
1、Jdom专用于java技术,比Dom应用占用更少内存。
2、Jdom提供更加简单和逻辑性访问
3、除
Jdom的构成:
Jdom由6个包构成
Element类表示
org.jdom: 解析
org.jdom.adapters: 包含DOM适配的Java类
org.jdom.filter: 包含
org.jdom.input: 包含读取
org.jdom.output: 包含输出
org.jdom.trans form: 包含将Jdom
Jdom包下载:http://www.jdom.org/downloads/index.html
这里笔者代码做的是使用java创建一个
二、操作
下载jdom包,解压文件jdom-2.0.6.jar,jdom-2.0.6-javadoc.jar,将包导入到lib文件夹下。(注,如果有错误的话,将Jdom中的包全部导入)
例子1:使用jdom创建一个
新建类CareateJdom
package com.book.jdom;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import org.jdom2.Document;import org.jdom2.Element;import org.jdom2.output.Format;import org.jdom2.output.//生成public class CreateJdom { public static void main(String[] args) { //定义元素 Element people,student; people = new Element("people"); student = new Element("student"); //设置属性 student.setAttribute("name", "张三"); student.setAttribute("salary","8000"); //设置文本 student.setText("呵呵"); //将其添加到根目录下 people.addContent(student); //新建一个文档。 Document doc = new Document(people); //读取格式,赋值给当前的Format Format format = Format.getCompactFormat(); //对当前格式进行初始化 format.setEncoding("UTF-8"); //设置 format.setIndent(" "); //建一个 new try { //将其写好的文本给工厂,并且建一个文件输出流,将数据输出 new FileOutputStream("people.)); System.out.println("成功!"); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }}/*运行结果:<?*/
例子2:使用Jdom解析people.
新建Read
package com.book.jdom;import java.io.IOException;import java.util.List;import org.jdom2.Document;import org.jdom2.Element;import org.jdom2.JDOMException;import org.jdom2.input.SAXBuilder;//读取people.public class Readpublic static void main(String[] args) { //新建构造器解析 SAXBuilder sax = new SAXBuilder(); //建一个文档去接受数据 Document doc; try { //获取people. doc = sax.build("people.); //获得根节点 Element people = doc.getRootElement(); //获得根节点下的节点数据 List<Element> list = people.getChildren(); for(int i = 0;i<list.size();i++){ Element e = list.get(i); //获得属性值 System.out.println("name:"+e.getAttributeValue("name")+" salary:"+e.getAttributeValue("salary")); //获得文本值 System.out.println(e.getText()); } } catch (JDOMException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }}/* * 运行结果: * name:张三 salary:8000 呵呵 * */
解析
用jdom获取多个相同标签名的不同属性值的方法<?true</Value> <Value Name="PhotoIDWidth">38PhotoIDWidth</Value> <Value Name="PhotoIDHeight">38</Value> <Key Name="Adult"> <Value Name="CrownPercent">0.10</Value> <Value Name="HeadPercent">0.60AdultHeadPercent</Value> </Key> <Key Name="Child"> <Value Name="CrownPercent">0.10</Value> <Value Name="HeadPercent">0.60ChildHeadPercent</Value> </Key> </Key> <Key Name="Australia"> <Value Name="TextKey">Australia</Value> <Value Name="Enabled">true</Value> <Value Name="PhotoIDWidth">35PhotoIDWidth</Value> <Value Name="PhotoIDHeight">45</Value> <Key Name="Adult"> <Value Name="CrownPercent">0.061</Value> <Value Name="HeadPercent">0.756"Adult"HeadPercent</Value> </Key> <Key Name="Child"> <Value Name="CrownPercent">0.072</Value> <Value Name="HeadPercent">0.711ChildHeadPercent</Value> </Key> </Key> <Key Name="Austria"> <Value Name="TextKey">Austria</Value> <Value Name="Enabled">true</Value> <Value Name="PhotoIDWidth">35PhotoIDWidth</Value> <Value Name="PhotoIDHeight">45</Value> <Key Name="Adult"> <Value Name="CrownPercent">0.064</Value> <Value Name="HeadPercent">0.744AdultHeadPercent</Value> </Key> <Key Name="Child"> <Value Name="CrownPercent">0.078</Value> <Value Name="HeadPercent">0.689ChildHeadPercent</Value> </Key> </Key></Configuration>package input;import java.io.IOException;import java.util.ArrayList;import java.util.List;import org.jdom.Document;import org.jdom.Element;import org.jdom.JDOMException;import org.jdom.input.SAXBuilder;public class Read/** * @param args */ public static void main(String[] args) throws JDOMException, IOException { SAXBuilder sb = new SAXBuilder(); //构造文档对象 Document doc = sb.build(Test.class.getClassLoader().getResourceAsStream("nation.)); //获取根元素 Element root = doc.getRootElement(); //定位到<Configuration> -> <Key> List<Element> list = root.getChildren("Key"); List<Element> children = new ArrayList<Element>(); List<Element> childrens = new ArrayList<Element>(); for (int i = 0; i < list.size(); i++) { Element element = (Element) list.get(i); System.out.print(element.getAttributeValue("Name")); //定位到<Configuration> -> <Key> -> <Value> children = element.getChildren("Value"); for(int j=0; j<children.size(); j++){ Element elementChildren = (Element) children.get(j); //定位到<Configuration> -> <Key> -> <Value Name="PhotoIDWidth"> if(elementChildren.getAttributeValue("Name").equals("PhotoIDWidth")){ //获取<Configuration> -> <Key> -> <Value Name="PhotoIDWidth"> 属性值 System.out.print("<--------->"+elementChildren.getAttributeValue("Name")); //获取<Configuration> -> <Key> -> <Value Name="PhotoIDWidth"> 标签里内容 System.out.print(","+elementChildren.getText()); } } children.clear(); //定位到<Configuration> -> <Key> -> <Key> children = element.getChildren("Key"); for(int j=0; j<children.size(); j++){ Element elementChildren = (Element)children.get(j); //定位到<Configuration> -> <Key> -> <Key Name="Child"> if(elementChildren.getAttributeValue("Name").equals("Child")){ //定位到<Configuration> -> <Key> -> <Key Name="Child"> -> <Value> childrens = elementChildren.getChildren("Value"); for(int k=0; k<childrens.size(); k++){ Element elementChildrens = (Element)childrens.get(k); //定位到<Configuration> -> <Key> -> <Key Name="Child"> -> <Value Name="HeadPercent"> if(elementChildrens.getAttributeValue("Name").equals("HeadPercent")){ System.out.println("<--------->"+elementChildrens.getText()); } } } } } }}打印结果:China<--------->PhotoIDWidth,38PhotoIDWidth<--------->0.60ChildHeadPercentAustralia<--------->PhotoIDWidth,35PhotoIDWidth<--------->0.711ChildHeadPercentAustria<--------->PhotoIDWidth,35PhotoIDWidth<--------->0.689ChildHeadPercentJdom解析
Jdom解析
原标题:Javaweb学习笔记——使用Jdom解析xml
关键词:JAVA