23种设计模式之门面模式

//这是基于xml把对象放入容器中的操作
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">


        <bean id="bs" class="com.dz147.Validator.BookServiceImpl"/>

    <bean id="bs2" class="com.dz147.Validator.BookServiceImpl2"/>
</beans>

package com.dz147.Validator;

public interface BookService {
    public void getInfo();
}

//实现
public class BookServiceImpl implements BookService {
    @Override
    public void getInfo() {
        System.out.println("这是第一个实现");
    }
}

使用

public class TestSpring {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext cc =
                new ClassPathXmlApplicationContext("spring/testSpring.xml");
        Object bs = cc.getBean("bs2");
        ((BookService)bs).getInfo();
    }
}

以上是基于XML

使用java注解

//使用java注解把对象放入Ioc容器中

@Configuration
public class BookServiceJavaStyle {

    @Bean
    public BookService xxx(){
        return new BookServiceImpl2();
    }
}

public class BookServiceImpl2 implements BookService {
    @Override
    public void getInfo() {
        System.out.println("这是第二个实现");
    }
}

public class TestSpring {
    public static void main(String[] args) {
        /*ClassPathXmlApplicationContext cc =
                new ClassPathXmlApplicationContext("spring/testSpring.xml");
        Object bs = cc.getBean("bs2");
        ((BookService)bs).getInfo();*/
        //java注解方式
        newJavaStyle();
    }

    public static void newJavaStyle() {
        AnnotationConfigApplicationContext acc =
                new AnnotationConfigApplicationContext(BookServiceJavaStyle.class);
        acc.getBean(BookService.class).getInfo();
    }
}