jdom增删改查

package bean;


import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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;

/**
* 邵波 QQ：343269876
*/
public class XmlParse {


//解析xml文件

public static void XmlParse() 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 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 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 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"));
}

static public void main(String ars[]) throws JDOMException, IOException {

// addXml();//增加XML
// deletePerson(3);//删除XML
// updatePerson(2);//修改XML
// XmlParse();//解析XML
}
}



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张三
123123


1111111112
password2