Spring入门例子

ゞ浴缸里的玫瑰 2022-05-19 13:51 282阅读 0赞

1、新建JavaProject项目springFirst，新建接口类包、实现类包、测试类包

![70][]

2、编写接口类Human

package com.interf;
    
    public interface Human {
    	void eat();
    	void walk();
    }

3、编写实现类Chinese、American

package com.impl;
    
    import com.interf.Human;
    
    public class Chinese implements Human {
    
    	@Override
    	public void eat() {
    		// TODO Auto-generated method stub
    		System.out.println("中国人很会吃！");
    	}
    
    	@Override
    	public void walk() {
    		// TODO Auto-generated method stub
    		System.out.println("中国人健步如飞！");
    	}
    
    }

package com.impl;
    
    import com.interf.Human;
    
    public class American implements Human {
    
    	@Override
    	public void eat() {
    		// TODO Auto-generated method stub
    		System.out.println("美国人吃西餐！");
    	}
    
    	@Override
    	public void walk() {
    		// TODO Auto-generated method stub
    		System.out.println("美国人经常坐车！");
    	}
    
    }

4、为项目添加spring开发能力

![70 1][]

![70 2][]

5、在applicationContextx.xml配置文件中添加bean信息

<?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:p="http://www.springframework.org/schema/p"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
    	<bean id="chinese" class="com.impl.Chinese"/>
    	<bean id="american" class="com.impl.American"/>
    </beans>

6、编写测试类Test

package com.test;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.FileSystemXmlApplicationContext;
    import com.impl.American;
    import com.interf.Human;
    
    public class Test {
    
    	public static void main(String[] args) {
    		//加载xml信息，装配bean
    		ApplicationContext context=new FileSystemXmlApplicationContext("src/applicationContext.xml");
    		Human human=(Human)context.getBean("chinese");//返回的是Object类型须强制转换
    		human.eat();
    		human.walk();
    		human=(American)context.getBean("american");//从id值筛选Bena
    		human.eat();
    		human.walk();
    	}
    }

7、启动查看测试结果

![70 3][]

[70]: /images/20220519/4146f17c33d24a6e85e297d914d6ac34.png
[70 1]: /images/20220519/b7fe87b087ff4165b30262b203c01fb6.png
[70 2]: /images/20220519/41eac69573b040a599bbc27a187fde72.png
[70 3]: /images/20220519/ddc431bdb303400385aa06fae6d266ba.png