1.Dom4j 解析xml

package com.imooc.dom4j;

import java.util.List;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class HrReader {
    public void readXml() {
        String file = "D:\\software\\Eclipse\\eclipse workspace\\xml\\src\\hr.xml";
        //SAXReader类是读取xml文件的核心类，用于将xml解析后，以树的形式保存在内存中
        SAXReader reader = new SAXReader();
        try {
            Document document = reader.read(file);
            //获取xml的根节点
            Element root = document.getRootElement();
            //elements 用于获取指定的标签集合
            List<Element> employees = root.elements("employee");
            for(Element employee:employees) {
                //element 方法用于获取唯一的子节点对象
                Element name = employee.element("name");
                String empName = name.getText();//用于获取标签文本
                System.out.println(empName);
                System.out.println(employee.elementText("age"));//直接获取标签中的文本信息
                System.out.println(employee.elementText("salary"));
                
                Element department = employee.element("department");
                System.out.println(department.elementText("dname"));
                
                //获取属性
                Attribute att = employee.attribute("no");
                System.out.println(att.getText());
                
                
                
            }
            
            
        } catch (DocumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        HrReader reader = new HrReader();
        reader.readXml();
    }
}

2.更新xml

package com.imooc.dom4j;

import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class HrWriter {
    String file = "D:\\software\\Eclipse\\eclipse workspace\\xml\\src\\hr.xml";
    public void writeXml() {
        SAXReader reader = new SAXReader();
        Document document;
        try {
            document = reader.read(file);
            Element root = document.getRootElement();
            Element employee = root.addElement("employee");
            employee.addAttribute("no", "233");
            Element name = employee.addElement("name");
            name.setText("王五");
            employee.addElement("age").setText("34");
            employee.addElement("salary").setText("5000");
            Element department = employee.addElement("department");
            department.addElement("dname").setText("人事部");
            department.addElement("address").setText("xx大厦-B1201");
            //将数据从内存写入xml文件
            Writer writer = new OutputStreamWriter(new FileOutputStream(file),"UTF-8");
            document.write(writer);
            writer.close();
            
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }
    
    public static void main(String[] args) {
        HrWriter hrWriter = new HrWriter();
        hrWriter.writeXml();
    }
}