2021-04-17----spring5----开启扫描组件

1.开启组件扫描 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       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
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-beans.xsd">

    <!--开启组件扫描

    base-package="com.ray"，会扫描com.ray包下的所有文件
    -->
    <context:component-scan base-package="com.ray"></context:component-scan>

    <!--开启组件扫描
      use-default-filters标签取消使用默认的spring的扫描策略，使用自定义的扫描策略
      include-filter标签指定想要扫描的策略
    -->
    <context:component-scan base-package="com.ray" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <context:component-scan base-package="com.ray" >
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

</beans>

2.添加注解实现bean的自动创建。