jdom解析xml

浅浅的花香味﹌ 2022-08-27 06:52 225阅读 0赞

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;

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<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"));  
\}  
  
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  
\}  
\}

\------------------------------------------------------------------------------------------------------

<?xml version="1.0" encoding="UTF-8"?>  
<root>  
<person id="1">  
<username>张三</username>  
<password>123123</password>  
</person>  
<person id="2">  
<username>1111111112</username>  
<password>password2</password>  
</person>

</root>