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  前言：控制反转(Inversion of Control，英文缩写为IoC)是一个重要的面向对象编程的法则来削减计算机程序的耦合问题，也是轻量级的Spring框架的核心。 控制反转一般分为两种类型，依赖注入(Dependency Injection，简称DI)和依赖查找(Dependency Lookup)。依赖注入应用比较广泛。

1.新建项目project ，命名Spring1002

   2.com.java.service

JavaWork.java代码：

package com.java.service;

public class JavaWork {
    //相当于实体类
    public Tester tester;

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

Tester.java

package com.java.service;

public interface Tester {
       public void test();
}

ZahngSan.java

package com.java.service;

public class ZhangSan implements Tester{
            
    public void test(){
                 System.out.println("张三————测试程序");
             }
}

   3.com.java.test

Test2.java代码：

package com.java.test;

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

import com.java.service.JavaWork;

public class Test2 {

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

}

   4.beans.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.xsd">

    <bean id="zhangsan" class="com.java.service.ZhangSan"></bean>
    <bean id="javaWork" class="com.java.service.JavaWork">
         <property name="tester" ref="zhangsan"></property>
    </bean>
  
</beans>

运行结果：