@Component 泛指组件的注册bean

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@Component 组件的注册bean

1.@Component 思维导图

2.@Component 思维导图

1.注册Bean

package com.spring.annotation.component ;

/**

* Created by Calvin on 2018/3/13

*/

/**

* @Component 注册 Bean

* @Component 泛指组件，当组件不好归类为哪一类的时候，使用该注解

* @Component 标注在类上

*/

@ org.springframework.stereotype.Component

public class Component {

public void init(){

System. out .println( "Component_Bean 初始化" );

}

public void runtime(){

System. out .println( "Component_Bean 加载执行中" );

}

}

2. 自动扫描 basePackages 下为 Bean 包路径： com.spring.annotation.component

package com.spring.annotation.component ;

import org.springframework.context.annotation. ComponentScan ;

import org.springframework.context.annotation. Configuration ;

/**

* Created by Calvin on 2018/3/14

*/

@Configuration

/**

* @ComponentScan 自动扫描 basePackages 下为 Bean 包路径

*/

@ComponentScan (basePackages = " com.spring.annotation.component " )

public class Component_Configuration {

Component_Configuration(){

System. out .println( "Spring 容器初始化" );

}

}

如同，在spring-configuration.xml 中配置

<? 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: jdbc =" http://www.springframework.org/schema/jdbc "

xmlns: jee =" http://www.springframework.org/schema/jee " xmlns: tx =" http://www.springframework.org/schema/tx "

xmlns: util =" http://www.springframework.org/schema/util " xmlns: task =" http://www.springframework.org/schema/task " 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

http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd

http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd

http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd

http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd

http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd " default-lazy-init ="false" >

< context :component-scan base-package =" com.spring.annotation.component " use-default-filters ="false" >

    < context :include-filter type ="annotation" expression =" org.springframework.stereotype.Component " />

</ context :component-scan >

3.获取实例化对象

package com.spring.annotation.component ;

import org.springframework.context.ApplicationContext;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

/**

* Created by Calvin on 2018/3/14

*/

public class Component_Test {

    public static void main(String[] args) {

        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(Component_Configuration. class );

        // 获取Bean

        Component component = applicationContext.getBean(Component. class );

        component.init();

        component.runtime()

    }

}

运行结果：

三月 14, 2018 1:04:54 上午 o rg.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@735f7ae5: startup date [Wed Mar 14 01:04:54 CST 2018]; root of context hierarchy

Spring 容器初始化

Component_Bean 初始化

Component_Bean 加载执行中

3.@Component 流程