開始學習springmvc各種小白問題

根據例子配置了spring掃描包，但是一直提示404錯誤，經過大量搜索，發現，掃描包的配置應該寫在springmvc的配置文件中，而不是springmvc

配置成功的applicationContext 即 spring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:aop
 
="http://www.springframework.org/schema/aop"
       xmlns:c="http://www.springframework.org/schema/c"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:flow="http://www.springframework.org/schema/webflow-config"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:jms
 
="http://www.springframework.org/schema/jms"
       xmlns:lang="http://www.springframework.org/schema/lang"
       xmlns:osgi="http://www.springframework.org/schema/osgi"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:util="http://www.springframework.org/schema/util"

       xsi:schemaLocation
 
="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
          http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
          http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
          http://www.springframework.org/schema/webflow-config http://www.springframework.org/schema/webflow-config/spring-webflow-config-2.0.xsd
          http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.3.xsd
          http://www.springframework.org/schema/jms http://www.springframework.org/schema/jms/spring-jms-4.3.xsd
          http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-4.3.xsd
          http://www.springframework.org/schema/osgi http://www.springframework.org/schema/osgi/spring-osgi-1.2.xsd
          http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
          http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd
">
   
     
      
         
</beans>

自動生成的，什麽也沒寫

springMvc的配置spring-servlet

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
     version="3.0">
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
 

 <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>
    <!-- 指定Spring Bean的配置文件所在目錄。默認配置在WEB-INF目錄下 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>WEB-INF/config/applicationContext.xml</param-value>
    </context-param>
    <!--SPRING MVC 配置-->
    <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>WEB-INF/config/spring-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>/</url-pattern>
        <!--註意/和/*的區別-->
    </servlet-mapping>
    
    
</web-app>

然後在web.xml中引入spring和springmvc的配置

 <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>
    <!-- 指定Spring Bean的配置文件所在目錄。默認配置在WEB-INF目錄下 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>WEB-INF/config/applicationContext.xml</param-value>
    </context-param>
    <!--SPRING MVC 配置-->
    <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>WEB-INF/config/spring-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>/</url-pattern>
        <!--註意/和/*的區別-->
    </servlet-mapping>

這就成功了。為何掃描包不能寫在spring的配置中呢

我查了一下

原理：

原來Spring 是父容器， Spring MVC是子容器， 子容器可以訪問父容器的bean,父容器不能訪問子容器的bean。

具體參照：

Spring和SpringMVC父子容器關系初窺

Spring為什麽不做全局包掃描

Spring與SpringMVC的容器關系分析

具體測試，後邊跟進。

當前做法就是springmvc加載所有bean就行了

為啥Spring和Spring MVC包掃描要分開