反射+抽象工厂
Posted 七月蜀葵
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现在SportsEquipmentFactory使用反射,不用switch判断
代码与上篇文章“抽象工厂模式”类似,只改动了SportsEquipmentFactory的代码
SportsEquipmentFactory
package com.maggie.FactoryMethod; import java.lang.reflect.InvocationTargetException; public class SportsEquipmentFactory { private String style; public Ball createBall() throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException, ClassNotFoundException { if (style != null && !style.equals("" )) { String className = "com.maggie.FactoryMethod." + style +"Ball" ; // 构造函数需要参数 Ball ball = (Ball) Class.forName(className).getConstructor(String. class ).newInstance(style); return ball; } return null ; } public Sneakers createSneakers() throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException, ClassNotFoundException{ if (style != null && !style.equals("" )) { String className = "com.maggie.FactoryMethod." + style +"Sneakers" ; Sneakers sneakers = (Sneakers) Class.forName(className).getConstructor(String. class ).newInstance(style); return sneakers; } return null ; } public String getStyle() { return style; } public void setStyle(String style) { this .style = style; } }
client端的调用
@Test public void test() throws IOException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException, ClassNotFoundException { Properties proper = new Properties(); InputStream is = this .getClass().getClassLoader().getResourceAsStream("my.properties"); // 在src目录下创建一个my.properties的配置文件,内容为style=foot proper.load(is); String style = proper.getProperty("style" ); SportsEquipmentFactory factory = new SportsEquipmentFactory(); factory.setStyle(style); Ball ball = factory.createBall(); ball.play(); Sneakers sneakers = factory.createSneakers(); sneakers.show(); }
输出
the ball\'s color is Foot,I am FootBall the sneakers is Foot
思考:如果业务又做大,工厂又需要生产网球类的产品
使用了反射,就只需要添加网球类和网球鞋类,然后配置文件改个单词就可以,不用去更改工厂类的任何代码,去除了switch和if解决了分支判断带来的耦合,就不违反了开放-封闭原则
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