一、Spring MVC的工作原理：

Paste_Image.png

二、加相关的Jar包

spring-web
javax.servlet-api - 多加<scope>provided</scope>
jstl

三、web.xml的配置：

 <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:app.xml</param-value>
</context-param>
<!--配置过滤器处理编码问题-->
<filter>
    <filter-name>enc</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>utf-8</param-value>
    </init-param>
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>enc</filter-name>
    <url-pattern>/*</url-pattern>   
</filter-mapping>

<!-- front controller配置前段控制器 -->
<servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>  
<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

四、XXX-servlet.xml的配置：XXX对应web里面的dispatcher

  <!-- 配置搜索组件的基本包(父包)将被注解的类的对象纳入Spring IoC -->
<context:component-scan base-package="cn.wll.ssm.controller" />
<!-- 使用注解来配置需要Spring IoC容器托管的对象以及对象之间的依赖关系 -->
<context:annotation-config />

<!-- 静态资源的请求 -->
<mvc:default-servlet-handler />

<!-- 视图解析器 -->
<bean id="jspViewResolver"
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass"
        value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix" value="/WEB-INF/jsp/" />
    <property name="suffix" value=".jsp" />
</bean>

<!-- <mvc:freemarker-configurer>
    <mvc:template-loader-path location="/WEB-INF/ftl"/>
</mvc:freemarker-configurer> -->

  <!-- 使用freemarker时的配置-编码、路径-->
<bean class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
    <property name="templateLoaderPath" value="/WEB-INF/ftl/" />
    <property name="defaultEncoding" value="utf-8" />
    <property name="freemarkerSettings">
        <props>
            <prop key="classic_compatible">true</prop>
        </props>
    </property>
</bean>

<!-- 配置使用FreeMarker的优先级别 -->
<bean class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
    <property name="order" value="5" />
    <property name="suffix" value=".ftl" />
    <property name="contentType" value="text/html;charset=utf-8" />
</bean>


<!-- location静态资源的路径 mapping资源映射 <mvc:resources location="" mapping=""/> -->

<mvc:annotation-driven>
    <!-- 消息转换器 -->
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />
        <bean class="org.springframework.http.converter.StringHttpMessageConverter" />
        <bean class="org.springframework.http.converter.BufferedImageHttpMessageConverter" />
    </mvc:message-converters>
</mvc:annotation-driven>

<!-- 配置验证码 -->
 <bean id="globalValidator"
    class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>
<mvc:annotation-driven validator="globalValidator">
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />
        <bean class="org.springframework.http.converter.StringHttpMessageConverter"/> 
        <bean class="org.springframework.http.converter.BufferedImageHttpMessageConverter"/>    
    </mvc:message-converters>
</mvc:annotation-driven>

注意：和web.xml放一起

五、XXX.xml的配置-app对应web.xml中classpath:app.xml

 <context:component-scan base-package="cn.wll.ssm" />
<context:annotation-config />
<aop:aspectj-autoproxy />
    
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost:3306/dang?useUnicode=true&amp;characterEncoding=utf8"/>
    <property name="username" value="root"/>
    <property name="password" value="123456"/>
</bean>
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="typeAliasesPackage" value="cn.wll.ssm.entity" />
    <property name="mapperLocations" value="classpath*:cn/wll/ssm/mapper/*.xml" />
    <!-- <property name="configLocation" value="WEB-INF/mybatis-config.xml" />  -->
</bean>
<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
    <constructor-arg index="0" ref="sqlSessionFactory" />
</bean>

<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource" />
</bean>
<tx:annotation-driven/>