xml的增删改操作
package com.xml.stu;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;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;import org.jdom.xpath.XPath;public class TestCreateXml {private void createXml() throws FileNotFoundException, IOException {/** * 构建XML文档节点名 */Element root = new Element("resume");Element name = new Element("name");Element job = new Element("job");Element gender = new Element("gender");/** * 给指定的节点添加参数属性 */Attribute attr = new Attribute("startAge","20");name.setAttribute(attr);/** * 构建DOM结构，往根节点root里添加子元素。 */root.addContent(name);root.addContent(job);root.addContent(gender);/** * 往节点里添加值，addContent(container):可以添加值和节点 * setText(string text):只能添加值 */name.addContent("朱元幛");job.setText("黄帝");gender.setText("其他");/** * 构建DOM节点 */Document doc = new Document(root);//Format f = Format.getPrettyFormat(); //xml的完美显示格式Format f = Format.getCompactFormat();//xml的紧凑显示格式f.setEncoding("gbk");//用流的方式生成xml文件 ;把DOM树从内存写到硬盘上。XMLOutputter xmlOut = new XMLOutputter(f);xmlOut.output(doc, new FileOutputStream("d:/2.xml"));}/** * 更新XML元素内容 * @throws FileNotFoundException * @throws JDOMException * @throws IOException */private void testUpdateXml() throws FileNotFoundException, JDOMException, IOException {SAXBuilder sb = new SAXBuilder();//将某一个XML文件 读入到内存当中Document doc = sb.build(new FileInputStream("d:/2.xml"));//对内存中的doc进行操作//一旦得到了根元素就可以对所有XML数据进行处理。Element root = doc.getRootElement();Element e = root.getChild("name");e.setText("zhujunzhang");Format f = Format.getPrettyFormat();//xml的完美显示格式f.setEncoding("gbk");//用流的方式生成xml文件 ;把DOM树从内存写到硬盘上。XMLOutputter xmlOut = new XMLOutputter(f);xmlOut.output(doc, new FileOutputStream("d:/2.xml"));}/** * XPATH对XML进行操作。 * @throws Exception */private void testXPATH() throws Exception {SAXBuilder sb = new SAXBuilder();Document doc = sb.build(new FileInputStream("d:/2.xml"));Element root = doc.getRootElement();//获得根元素后，就可操作所有原素了//XPath xpath = XPath.newInstance("//name[text()='朱高煦']");XPath xpath = XPath.newInstance("/resume/sons/name");List list = xpath.selectNodes(root);System.out.println("容器文体节点原素数为："+list.size());for (int i = 0;i < list.size();i++) {Element e = (Element) list.get(i);System.out.println(e.getText());}}public static void main(String[] args) throws Exception {new TestCreateXml().createXml();//new TestCreateXml().testUpdateXml();//new TestCreateXml().testXPATH();}}