用idea完成一个dom4j实例

首先咱们要先有dom4j的jar包,没有的能够去https://dom4j.github.io/下载

建立一个web项目,并在WEB-INF文件下建立一个lib文件夹，把咱们下载的dom4j-1.6.1jar包放到里面

找到File-->Project Structure-->Modules里的Dependencies,找到咱们项目的lib文件夹

如今咱们正式开始咱们的项目代码

实体类：

 1 package vo;  2 
 3 public class Student {  4     private String name;//姓名
 5     private int age;    //年龄
 6 
 7     public Student() {  8  }  9 
10     public Student(String name, int age) { 11         this.name = name; 12         this.age = age; 13  } 14 
15     public String getName() { 16         return name; 17  } 18 
19     public void setName(String name) { 20         this.name = name; 21  } 22 
23     public int getAge() { 24         return age; 25  } 26 
27     public void setAge(int age) { 28         this.age = age; 29  } 30 
31     //重写toSting()方法
32  @Override 33     public String toString() { 34         return "Student{" +
35                 "name='" + name + '\'' +
36                 ", age=" + age +
37                 '}'; 38  } 39 }

xml文件（注意xml文件的格式）：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <students>
 3 
 4     <student>
 5         <name>张三</name>
 6         <age>39</age>
 7     </student>
 8 
 9     <student>
10         <name>李四</name>
11         <age>45</age>
12     </student>
13 
14     <student>
15         <name>王五</name>
16         <age>34</age>
17     </student>
18 </students>

测试方法:

 

 1 package dao;  2 
 3 import org.dom4j.Document;  4 import org.dom4j.DocumentException;  5 import org.dom4j.Element;  6 import org.dom4j.io.SAXReader;  7 import vo.Student;  8 
 9 import java.io.File; 10 import java.util.ArrayList; 11 import java.util.List; 12 
13 public class StudentDao { 14     public List<Student> getStudentAll() throws DocumentException { 15         //建立SAXReader对象
16         SAXReader saxReader = new SAXReader(); 17         //找到定义的xml文件,把里面的内容变成Document对象
18         Document document = saxReader.read(new File("src/xml/studentXml.xml")); 19         //获取根节点元素对象
20         Element root = document.getRootElement(); 21         //把全部元素节点放入到List中
22         List<Element> listElement = root.elements(); 23 
24         List<Student> listBook = new ArrayList<Student>(); 25         Student student = null; 26         //遍历全部的元素节点
27         for (Element e : listElement) { 28             //把节点为name里的数取出
29             String name = e.element("name").getText(); 30             //把节点为age里的数取出
31             int age = Integer.parseInt(e.element("age").getText()); 32             //把取到的数加入到Student对象中
33             student=new Student(name,age); 34             //把Student对象加入到List集合里
35  listBook.add(student); 36  } 37         return listBook; 38  } 39 }

 

测试:

 1 package main;  2 
 3 import dao.StudentDao;  4 import org.dom4j.DocumentException;  5 
 6 public class StudentTest {  7     public static void main(String[] args) throws DocumentException {  8         StudentDao dao=new StudentDao();  9  System.out.println(dao.getStudentAll()); 10  } 11 }

结果：