用DOM4J解析XML文件案例

时间：2023-09-01 20:43:38

用DOM4J解析XML文件案例，由于DOM4J不像JAXP属于JAVASE里，所以如果要使用DOM4J，则必须额外引入jar包，如图：

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1.xml文件

<?xml version="1.0" encoding="UTF-8"?>

<class>

  <student>

    <name>张三</name>

    <sid>111111</sid>

  </student>

  <student>

    <name>李四</name>

    <sid>222222</sid>

  </student>

</class>

Java代码：

import java.io.FileOutputStream;

import java.util.List;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.DocumentHelper;

import org.dom4j.Element;

import org.dom4j.io.OutputFormat;

import org.dom4j.io.SAXReader;

import org.dom4j.io.XMLWriter;

public class Dom4jCase {

    static Element root;

    public static void main(String[] args) throws Exception {

        add();//在第一个学生里面增加性别标签<sex>男</sex>

        //add2();//在第一个学生的<name>张三</name>标签后增加<home>沭阳</home>

        //delete();//删除上面增加的性别标签<sex>男</sex>

        //modify();//将上面增加的标签<home>沭阳</home>改为<home>江苏</home>

        //select();//查询所有学生姓名

    }

    //在第一个学生里面增加性别标签<sex>男</sex>

    private static void add() throws Exception {

        Document document = getRoot();

        Element s1=root.element("student");

        Element sex1=s1.addElement("sex");

        sex1.setText("男");

        writeBack(document);

    }

    //在第一个学生的<name>张三</name>标签后增加<home>沭阳</home>

    private static void add2() throws Exception {

        Document document = getRoot();

        Element s1=root.element("student");

        List<Element>list=s1.elements();

        Element home=DocumentHelper.createElement("home");

        home.setText("沭阳");

        list.add(1,home );

        writeBack(document);

    }

    //删除上面增加的性别标签<sex>男</sex>

    private static void delete() throws Exception{

        Document document = getRoot();

        Element s1=root.element("student");

        s1.remove(s1.element("sex"));

        writeBack(document);

    }

    //将上面增加的标签<home>沭阳</home>改为<home>江苏</home>

    private static void modify() throws Exception{

        Document document = getRoot();

        Element s1=root.element("student");

        s1.element("home").setText("江苏");

        writeBack(document);

    }

    //查询所有学生姓名

    private static void select() throws Exception{

        Document document = getRoot();

        List<Element> list=root.elements("student");

        for(int i=0;i<list.size();i++)

        {

            System.out.println(list.get(i).elementText("name"));

        }

    }

    //XML回写

    private static void writeBack(Document document)throws Exception {

        OutputFormat format=OutputFormat.createPrettyPrint();

        XMLWriter writer=new XMLWriter(new FileOutputStream("src/1.xml"), format);

        writer.write(document);

        writer.close();

    }

    //初始化

    private static Document getRoot() throws DocumentException {

        SAXReader saxReader=new SAXReader();

        Document document=saxReader.read("src/1.xml");

        root=document.getRootElement();

        return document;

    }

}

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