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一、目标:读取properties文件,获得类名来生成对象
二、类
1.Movable.java
public interface Movable { void run(); }
2.Car.java
public class Car implements Movable { public void run() { System.out.println("Car running..............."); } }
3.spring.properties
PS:"="两边不能有空格
vechileType=com.tong.spring.factory.Car
4.Test.java
public class Test { @org.junit.Test public void test() { //读取properties文件,获得类名来生成对象 Properties pros = new Properties(); try { //1.读取要实例化的类名 pros.load(Test.class.getClassLoader().getResourceAsStream("com/tong/spring/factory/spring.properties")); String vechileType = pros.getProperty("vechileType"); //2.利用反射装载类及用newInstance()实例化类 Object o = Class.forName(vechileType).newInstance(); Movable m = (Movable)o; m.run(); } catch (Exception e) { e.printStackTrace(); } } }
5.运行结果:
6.若改成spring读取xml文件,则spring配置好后,增加applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="vehicle" class="com.tong.spring.factory.Car"> </bean> <!-- more bean definitions go here --> </beans>
7.Test.java改为如下
public class Test { @org.junit.Test public void test() { BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml"); Object o = factory.getBean("vehicle"); Movable m = (Movable)o; m.run(); } }
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原文地址:http://www.cnblogs.com/shamgod/p/4586971.html