【JavaWeb】XML的理解与Dom4j解析技术的使用（下）

package com.hxh.domxml;
/**
 * @author 兴趣使然黄小黄
 * @version 1.0
 * 对照students.xml文件完成Student类
 */
public class Student {
    private String sno;
    private String name;
    private int age;
    public Student() {
    }
    public Student(String sno, String name, int age) {
        this.sno = sno;
        this.name = name;
        this.age = age;
    }
    @Override
    public String toString() {
        return "Student{" +
                "sno='" + sno + '\'' +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
    public String getSno() {
        return sno;
    }
    public String getName() {
        return name;
    }
    public int getAge() {
        return age;
    }
    public void setSno(String sno) {
        this.sno = sno;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setAge(int age) {
        this.age = age;
    }
}

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.junit.Test;
import java.util.List;
/**
 * @author 兴趣使然黄小黄
 * @version 1.0
 */
public class Dom4jTest {
    /**
     * 读取xml获取document对象的方法
     * @throws DocumentException
     */
    @Test
    public void test01() throws DocumentException {
        // 创建一个SaxReader输入流，去读取xml配置文件，生成Document对象
        SAXReader saxReader = new SAXReader();
        Document document = saxReader.read("src/students.xml");
        //测试是否读取
        System.out.println(document);
    }
    /**
     * 读取students.xml文件生成Student类
     * @throws DocumentException
     */
    @Test
    public void test02() throws DocumentException {
        //1.读取xml文件
        SAXReader saxReader = new SAXReader();
        //在Junit测试中，相对路径从模块名算起
        Document document = saxReader.read("src/students.xml");
        //2.通过文档对象获取根元素
        Element rootElement = document.getRootElement();
        //System.out.println(rootElement);
        //3.通过根元素获取student标签对象
        //element()和elements()都是通过标签名查找子元素
        List<Element> students = rootElement.elements("student");
        //4.遍历，处理每个student标签转换为Student类
        System.out.println("|\t\t学号\t\t|\t\t姓名\t\t|\t\t年龄\t\t|");
        for (Element student :
                students) {
            //asXML将标签对象转换为标签字符串
            //System.out.println(student.asXML());
            Element nameElement = student.element("name");
            //获取标签中的文本内容
            String nameText = nameElement.getText();
            //也可以直接通过student.elementText()方法一次性得到对应标签的文本内容
            String ageText = student.elementText("age");
            //获取标签内的属性
            String snoText = student.attributeValue("sno");
            //打印结果
            System.out.println("\t"+ snoText + "\t\t\t" + nameText + "\t\t\t\t" + ageText + "\t\t");
        }
    }
}