spring4学习之Ioc入门（二）

IOC：控制反转
IOC：又称作依赖注入，是一种重要的面向对象编程的法则来削弱计算机程序的耦合问题，也是轻量级框架spring的核心。
代码实现

1.编写Zhangsan、Lisi和接口Tester

package com.newbeedaly.service;

public interface Tester {

    public void test();
}

package com.newbeedaly.service;

public class ZhangSan implements Tester{

    public void test(){
        System.out.println("张三-测试程序");
    }
}

package com.newbeedaly.service;

public class Lisi implements Tester{

    public void test(){
        System.out.println("李四-测试程序");
    }
}

2.编写类JavaWork

package com.newbeedaly.service;

public class JavaWork {

    // 测试人
    private Tester tester;

    public void setTester(Tester tester) {
        this.tester = tester;
    }

    public void doTest(){

        tester.test();
    }
}

3.配置Beans.xml文件

<?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.xsd">

    <bean id="zhangsan" class="com.newbeedaly.service.ZhangSan"></bean>

    <bean id="lisi" class="com.newbeedaly.service.Lisi"></bean>

    <bean id="javaWork" class="com.newbeedaly.service.JavaWork">
        <property name="tester" ref="lisi"></property>
    </bean>

</beans>

4.编写Test测试类

package com.newbeedaly.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.newbeedaly.service.JavaWork;

public class Test {

    public static void main(String[] args) {
        ApplicationContext ac=new ClassPathXmlApplicationContext("beans.xml");
        JavaWork javaWork=(JavaWork)ac.getBean("javaWork");
        javaWork.doTest();
    }
}