JavaSE练习 - BeanUtils的使用综合案例

前言：使用BeanUtils简化bean对象数据分装，对象创建使用反射，XML解析使用dom4j。

一、导入jar包

项目目录下新建文件夹lib，添加commons-beanutils jar包、commons-logging jar包和dom4j jar包到lib文件夹下，选中三个jar包右键buildpath –>Add to buildpath。

二、编写xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans>
<bean className="cn.itcast.javaeevideoday02.Uesr">
<porperty name="username" value="大家都说名字长不会被发现"></porperty>
<porperty name="password" value="ccc12345"></porperty>
</bean>

<bean className="cn.itcast.javaeevideoday02.Student">
<porperty name="name" value="李猜"></porperty>
<porperty name="age" value="20"></porperty>
<porperty name="sex" value="男"></porperty>
</bean>

</beans>

三、创建Javabean类

User类：

package cn.itcast.javaeevideoday02;

public class Uesr {
private String username;
private String password;
public Uesr() {
super();
// TODO Auto-generated constructor stub
}
public Uesr(String username, String password) {
super();
this.username = username;
this.password = password;
}
public String getusername() {
return username;
}
public void setusername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "Uesr [username=" + username + ", password=" + password + "]";
}

}

Student类：

package cn.itcast.javaeevideoday02;
/**
*
* @author 大家都说名字长不会被发现
*
*/
public class Student {
public String name;
public String age;
public String sex;
public Student() {
super();
// TODO Auto-generated constructor stub
}
public Student(String name, String age, String sex) {
super();
this.name = name;
this.age = age;
this.sex = sex;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
@Override
public String toString() {
return "Student [name=" + name + ", age=" + age + ", sex=" + sex + "]";
}

}

三、BeanUtilesDemo类代码实现

package cn.itcast.javaeevideoday02;

import java.awt.event.MouseWheelEvent;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.beanutils.BeanUtils;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

/**
*
* @author 大家都说名字长不会被发现
*
*/
public class BeanUtilsDemo {
public static void main(String[] args) throws Exception {
//获取SAXReader对象
SAXReader reader = new SAXReader();

//读取XML文件
Document document = reader.read("beans.xml");

//获取根标签
Element rootElement = document.getRootElement();

//获取根标签下所有指定子标签
List<Element> elements = rootElement.elements();

//创建集合对象
ArrayList<Object> lists = new ArrayList<>();

for (Element element : elements) {
//获取属性值
String className = el
b6fb
ement.attributeValue("className");
//获取字节码文件对象
Class c = Class.forName(className);

//快捷方式获取对象实例
Object object = c.newInstance();

//获取下一级子标签
List<Element> subElements = element.elements();

for (Element subElement : subElements) {
String name = subElement.attributeValue("name");
String value = subElement.attributeValue("value");

//使用BeanUtils给对象封装数据
BeanUtils.setProperty(object, name, value);
}
//将对象添加到集合
lists.add(object);
}

System.out.println(lists);
}
}