问题描述

基本类图

项目结构

实现工厂模式

运行的效果

代码

package Car;

public interface Benz {
    public  void carColor();
    public  void carSpeed();
    public  void carPrice();

}

package Car;

public class BenzC180 implements Benz {

    @Override
    public void carColor() {
        System.out.println("BenzC180:carColor:red");
        
    }

    @Override
    public void carSpeed() {
        System.out.println("BenzC180:carSpeed:100km/h");
        
    }

    @Override
    public void carPrice() {
        System.out.println("BenzC180:carPrice:500,000");
        
    }
    
}

package Car;

public class BenzE260 implements Benz {

    @Override
    public void carColor() {
        System.out.println("BenzE260:carColor:blue");
        
    }

    @Override
    public void carSpeed() {
        System.out.println("BenzE260:carSpeed:120km/h");
        
    }

    @Override
    public void carPrice() {
        System.out.println("BenzE260:carPrice:1,000,000");
        
    }
    
}

package Car;

public interface BenzFactory extends  Benz{
    public  void createCar();
}

package Car;

public class C180Factory implements BenzFactory{

    @Override
    public void carColor() {
        System.out.println("BenzC180:carColor:red");
        
    }

    @Override
    public void carSpeed() {
        System.out.println("BenzC180:carSpeed:100km/h");
        
    }

    @Override
    public void carPrice() {
        System.out.println("BenzC180:carPrice:500,000");
        
    }

    @Override
    public void createCar() {
        System.out.println("BenzC180:createCar");
        
    }
    
}

package Car;

public class E260Factory implements BenzFactory{

    @Override
    public void carColor() {
        System.out.println("BenzE260:carColor:blue");
        
    }

    @Override
    public void carSpeed() {
        System.out.println("BenzE260:carSpeed:120km/h");
        
    }

    @Override
    public void carPrice() {
        System.out.println("BenzE260:carPrice:1,000,000");
        
    }
    

    @Override
    public void createCar() {
        System.out.println("BenzE260:createCar");
        
    }
    
}

package Car;

public class main {
    public static void main(String[] args) {
        // 生产BenzC180
        BenzFactory c180  = new C180Factory();
        c180.carColor();
        c180.carPrice();
        c180.carSpeed();
        c180.createCar();
        System.out.println("============================");
        // 生产BenzE260
        BenzFactory e260  = new E260Factory();
        e260.carColor();
        e260.carPrice();
        e260.carSpeed();
        e260.createCar();

        
    }
}

反射读取xml，并创建对象

要求

xml配置文件，仿照前面的示例定义一个读取配置文件的工具类，能够从配置文件中读取需要创建的工厂类名。
运行效果

代码

<?xml version="1.0" encoding="UTF-8"?>
<beans>
    <!-- Cat类是个包 -->
    <bean id="id1" class="Car.C180Factory">
    </bean>

    <!-- Cat类是个包 -->
    <bean id="id2" class="Car.E260Factory">
    </bean>
</beans>

package Car.config;

import java.io.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class XMLUtil {
    public static void main(String args[]) {
        
        Element element = null;
        // 路径
        File f = new File("src/Car/config/config.xml");
        DocumentBuilder db = null;
        DocumentBuilderFactory dbf = null;
        try {
            // 创建DocumentBuilderFactory的实例
            dbf = DocumentBuilderFactory.newInstance();
            // 创建newDocumentBuilder的实例
            db = dbf.newDocumentBuilder();
            Document dt = db.parse(f);// 得到一个DOM
            element = dt.getDocumentElement();
            String nodeName = element.getNodeName();
            System.out.println("根元素：" + nodeName);
            // 根元素下的所有子节点
            NodeList childNodes = element.getChildNodes();
            // 遍历这些子节点
            for (int i = 0; i < childNodes.getLength(); i++) {
                // 获得每个对应位置i的结点
                Node node1 = childNodes.item(i);
                if ("bean".equals(node1.getNodeName())) {
                    String sClass = node1.getAttributes().getNamedItem("class").getNodeValue();
                    System.out.println(sClass);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}