package com.demo.xml;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;
/**
*
* @author 周洋
* function:对XML进行增删改查
*
*/
public class XmlDemo {
public static void XmlRead() throws JDOMException, IOException {
SAXBuilder builder = new SAXBuilder();
InputStream file = new FileInputStream("src/xml/po.xml");
Document document = builder.build(file);//获得文档对象
Element root = document.getRootElement();//获得根节点
List<Element> list = root.getChildren();
for(Element e:list) {
System.out.println("ID="+e.getAttributeValue("id"));
System.out.println("username="+e.getChildText("username"));
System.out.println("password="+e.getChildText("password"));
}
}
//增
public static void addXml() throws JDOMException, FileNotFoundException, IOException {
SAXBuilder builder = new SAXBuilder();
Document doc = builder.build("src/xml/po.xml");//获得文档对象
Element root = doc.getRootElement();//获得根节点
//添加新元素
Element element = new Element("person");
element.setAttribute("id", "3");
Element element1 = new Element("username");
element1.setText("zhangdaihao");
Element element2 = new Element("password");
element2.setText("mima");
element.addContent(element1);
element.addContent(element2);
root.addContent(element);
doc.setRootElement(root);
//文件处理
XMLOutputter out = new XMLOutputter();
out.output(doc, new FileOutputStream("src/xml/po.xml"));
}
//根据ID值删除一个节点
public static void deletePerson(int id) throws JDOMException, IOException {
SAXBuilder builder = new SAXBuilder();
InputStream file = new FileInputStream("src/xml/po.xml");
Document doc = builder.build(file);//获得文档对象
Element root = doc.getRootElement();//获得根节点
List<Element> list = root.getChildren();
for(Element e:list) {
//获取ID值
if(Integer.parseInt(e.getAttributeValue("id"))==id) {
root.removeContent(e);
break;//
}
}
//文件处理
XMLOutputter out = new XMLOutputter();
out.output(doc, new FileOutputStream("src/xml/po.xml"));
}
//根据ID值修改一个节点
public static void updatePerson(int id) throws JDOMException, IOException {
SAXBuilder builder = new SAXBuilder();
InputStream file = new FileInputStream("src/xml/po.xml");
Document doc = builder.build(file);//获得文档对象
Element root = doc.getRootElement();//获得根节点
List<Element> list = root.getChildren();
for(Element e:list) {
//获取ID值
if(Integer.parseInt(e.getAttributeValue("id"))==id) {
System.out.println("--------------------");
e.getChild("username").setText("111111111");
e.getChild("password").setText("password");
}
}
//文件处理
XMLOutputter out = new XMLOutputter();
out.output(doc, new FileOutputStream("src/xml/po.xml"));
}
/**
* @param args
* @throws IOException
* @throws JDOMException
*/
public static void main(String[] args) throws JDOMException, IOException {
// TODO Auto-generated method stub
XmlRead();
//addXml();
//deletePerson(3);
//updatePerson(1);
System.out.println("success.....");
}
}
