Spring和Spring MVC容器分开包扫描

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1. Spring MVC容器

一般来说，Spring MVC主要负责的是Controller层，所有可以简单的把配置文件写为

<?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:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd 
       http://www.springframework.org/schema/context 
       http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 解决@Controller的前提配置 -->
    <mvc:annotation-driven/>
    <!-- 包扫描，将注解的类注入（扫描Controller层） -->
    <context:component-scan base-package="xyz.cglzwz.controller"/>
</beans>

---

2. Spring 容器

作为父容器，Spring容器管理其余层，如Service, Domain, Dao等等

<?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"
       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">

    <!-- 包扫描，将注解的类注入 -->
    <context:component-scan base-package="xyz.cglzwz.*">
        <!-- 不扫描@Controller注解 -->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

</beans>

使用<context:component-scan>的两个子标签可以很好的解决重复扫描的问题

1. <context:exclude-filter>不扫描
2. <context:include-filter>加入扫描

当然使用多个包扫描也可以，逗号分割，但是多的话很不雅观。如下

<context:component-scan base-package="xyz.cglzwz.service, xyz.cglzwz.dao, xyz.cglzwz.domain"/>