创建XML文件：文件名：收藏信息
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<PhoneInfo>
<Brand name="华为">
<Type name="HW2"/>
</Brand>
<Brand name="苹果">
<Type name="iPhone6"/>
<Type name="iPhone6s"/>
<Type name="iPhone7"/>
</Brand>
<Brand name="三星">
<Type name="NOTE2"/>
</Brand>
</PhoneInfo>
创建Java文件
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Iterator;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
public class DOM4JXMLDemo {
private Document document;
//获得document对象
public void loadDocument() {
SAXReader saxReader = new SAXReader();
try {
document = saxReader.read(new File("收藏信息.xml"));
} catch (DocumentException e) {
e.printStackTrace();
}
}
//显示手机的品牌及型号
@SuppressWarnings("rawtypes")
public void showPhoneInfo() {
//获取XML根节点
Element root = document.getRootElement();
//获取所有Brand
Iterator eleBrand = root.elementIterator();
while(eleBrand.hasNext()) {
Element brand = (Element)eleBrand.next();
System.out.println(brand.attributeValue("name"));//打印所有的Brand
Iterator eleType = brand.elementIterator();
while(eleType.hasNext()) {
Element type = (Element)eleType.next();
System.out.println("\t"+type.attributeValue("name"));//打印所有的Type
}
}
}
//增加手机品牌
public void addNewPhone() {
//获得XML根元素
Element root = document.getRootElement();
//创建Brand
Element eleBrand = root.addElement("Brand");
eleBrand.addAttribute("name", "华为");
//创建<Type name="HW123"/>
Element eleType = eleBrand.addElement("Type");
eleType.addAttribute("name", "HW123");
saveXML("newInfo.xml");
}
//保存修改到XML文件
public void saveXML(String path) {//设置漂亮的格式
OutputFormat format = OutputFormat.createPrettyPrint();
// format.setEncoding("GBK");//设置保存的格式
XMLWriter writer = null;
try {//输出流
writer = new XMLWriter(new OutputStreamWriter(new FileOutputStream(path)),format);
writer.write(document);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally {
try {
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
//修改节点
@SuppressWarnings("rawtypes")
public void updataPhone() {
//获得XML根元素
Element root = document.getRootElement();
Iterator eleBrand = root.elementIterator();
int id=0;
while(eleBrand.hasNext()) {
Element brand = (Element)eleBrand.next();
id++;
brand.addAttribute("id", id+"");
}
saveXML("newInfo.xml");
}
//删除节点
@SuppressWarnings("rawtypes")
public void deletePhone() {
//获得XML根元素
Element root = document.getRootElement();
Iterator eleBrand = root.elementIterator();//迭代器获取每个Brand
while(eleBrand.hasNext()) {
Element brand = (Element)eleBrand.next();
if(brand.attributeValue("name").equals("三星")) {
brand.getParent().remove(brand);//拿到父节点用父节点删除子节点
}
}
saveXML("newInfo.xml");
}
public static void main(String[] args) {
DOM4JXMLDemo domDemo = new DOM4JXMLDemo();
domDemo.loadDocument();
domDemo.addNewPhone();
domDemo.updataPhone();
domDemo.deletePhone();
domDemo.showPhoneInfo();
}
}
