JavaSE练习

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 = element.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);    }}