Spring实战——搜索Bean类

╰半夏微凉° 2021-07-24 13:14 397阅读 0赞

**一 配置文件**

<?xml version="1.0" encoding="GBK"?>
    <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"
         xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context-4.0.xsd">
         
         <context:component-scan
               base-package="org.crazyit.app.service"/>
    </beans>

**二 接口**

Axe

package org.crazyit.app.service;
    
    public interface Axe
    {
         public String chop();
    }

Person

package org.crazyit.app.service;
    
    public interface Person
    {
         public void useAxe();
    }

**三 Bean**

Chinese

package org.crazyit.app.service.impl;
    
    
    import org.springframework.stereotype.*;
    
    
    import org.crazyit.app.service.*;
    
    @Component
    public class Chinese
        implements Person
    {
        private Axe axe;
        // axe的setter方法
        public void setAxe(Axe axe)
        {
            this.axe = axe;
        }
        // 实现Person接口的useAxe()方法
        public void useAxe()
        {
            System.out.println(axe.chop());
        }
    }

SteelAxe

package org.crazyit.app.service.impl;
    
    
    import org.springframework.stereotype.*;
    
    
    import org.crazyit.app.service.*;
    
    @Component
    public class SteelAxe implements Axe
    {
        public String chop()
        {
            return "钢斧砍柴真快";
        }
    }

StoneAxe

package org.crazyit.app.service.impl;
    
    
    import org.springframework.stereotype.*;
    
    
    import org.crazyit.app.service.*;
    
    @Component
    public class StoneAxe implements Axe
    {
        public String chop()
        {
            return "石斧砍柴好慢";
        }
    }

**四 测试类**

package lee;
    
    import org.springframework.context.*;
    import org.springframework.context.support.*;
    
    
    public class BeanTest
    {
        public static void main(String[] args)
        {
            // 创建Spring容器
            ApplicationContext ctx = new
                ClassPathXmlApplicationContext("beans.xml");
            // 获取Spring容器中的所有Bean实例的名
            System.out.println("--------------" +
                java.util.Arrays.toString(ctx.getBeanDefinitionNames()));
        }
    }

**五 测试结果**

--------------[chinese, steelAxe, stoneAxe,  org.springframework.context.annotation.internalConfigurationAnnotationProcessor,  org.springframework.context.annotation.internalAutowiredAnnotationProcessor,  org.springframework.context.annotation.internalRequiredAnnotationProcessor,  org.springframework.context.annotation.internalCommonAnnotationProcessor,  org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor,  org.springframework.context.annotation.ConfigurationClassPostProcessor.enhancedConfigurationProcessor]