创建IInterface

IOneInterface

package com.spring.ioc.interfaces;

public interface IOneInterface {
    public void say(String arg);
}

创建实现类

IOneInterfaceImpl

package com.spring.ioc.interfaces;

public class IOneInterfaceImpl implements IOneInterface {
    @Override
    public void say(String arg) {
        System.out.println("ServiceImpl say: " + arg);
    }
}

Spring.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="oneInterface" class="com.spring.ioc.interfaces.IOneInterfaceImpl"></bean>

</beans>

调用Bean

package com.spring.test.ioc.interfaces;

import com.spring.ioc.interfaces.IOneInterface;
import com.spring.test.base.UnitTestBase;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;

@RunWith(BlockJUnit4ClassRunner.class)
public class InterfacesTest extends UnitTestBase {
    public InterfacesTest(){
        super("classpath:spring-ioc.xml");
    }

    @Test
    public void testSay(){
        IOneInterface oneInterface = super.getBean("oneInterface");
        oneInterface.say("This is a test.");
    }
}