配置文件如下

mybatis.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <package name="com.shsxt.ssm.po"/>
    </typeAliases>
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
    </plugins>

</configuration>

spring.xml

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
       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
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 扫描基本包 -->
    <context:component-scan base-package="com.shsxt.ssm" >
        <!--  context:exclude-filter标签：排除对某个注解的扫描 （过滤controller层） -->
        <context:exclude-filter type="annotation"
                                expression="org.springframework.stereotype.Controller" />
    </context:component-scan>

    <!-- 加载properties 配置文件 -->
    <context:property-placeholder location="classpath:db.properties" />

    <!-- aop -->
    <aop:aspectj-autoproxy />

    <!-- 配置c3p0 数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

    <!-- 配置事务管理器 -->
    <bean id="txManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 设置事务增强 -->
    <tx:advice id="txAdvice" transaction-manager="txManager">
        <tx:attributes>
            <tx:method name="add*" propagation="REQUIRED" />
            <tx:method name="insert*" propagation="REQUIRED" />
            <tx:method name="update*" propagation="REQUIRED" />
            <tx:method name="delete*" propagation="REQUIRED" />
        </tx:attributes>
    </tx:advice>

    <!-- aop 切面配置 -->
    <aop:config>
        <aop:pointcut id="servicePointcut"
                      expression="execution(* com.shsxt.ssm.service..*.*(..))" />
        <aop:advisor advice-ref="txAdvice" pointcut-ref="servicePointcut" />
    </aop:config>

    <!-- 配置 sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="configLocation" value="classpath:mybatis.xml" />
        <property name="mapperLocations" value="classpath:com/shsxt/ssm/mapper/*.xml" />
    </bean>

    <!-- 配置扫描器 -->
    <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 扫描com.xxxx.ssm.dao这个包以及它的子包下的所有映射接口类 -->
        <property name="basePackage" value="com.shsxt.ssm.dao" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
    </bean>
</beans>

serelt-controller.xml(实际上他就是spring mvc的配置文件)

<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/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        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">

    <!-- 开启扫描器 -->
    <context:component-scan base-package="com.shsxt.ssm.controller" />

    <!-- mvc 注解驱动 并添加json 支持 -->
    <mvc:annotation-driven>
        <mvc:message-converters>
            <!-- 返回信息为字符串时 处理 -->
            <bean class="org.springframework.http.converter.StringHttpMessageConverter"/>
            <!-- 将对象转换为json 对象 -->
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
        </mvc:message-converters>
    </mvc:annotation-driven>


    <!-- 使用默认的 Servlet 来响应静态文件 -->
    <mvc:default-servlet-handler/>


    <!-- 配置视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          id="internalResourceViewResolver">
        <!-- 前缀：在WEB-INF目录下的jsp目录下 -->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!-- 后缀：以.jsp结尾的资源 -->
        <property name="suffix" value=".jsp"/>
    </bean>


    <!-- 文件上传 -->
    <bean id="multipartResolver"
          class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 允许文件上传的最大尺寸 -->b
        <property name="maxUploadSize">
            <value>104857600</value>
        </property>
        <!--
          设置文件放入临时文件夹的最大大小限制。
          此值是阈值，低于此值，则保存在内存中，如高于此值，则生成硬盘上的临时文件。
        -->
        <property name="maxInMemorySize">
            <value>4096</value>
        </property>
    </bean>


    <!--
        全局异常统一处理
            方式一：使用 Spring MVC 提供的简单异常处理器 SimpleMappingExceptionResolver
            方式二：实现 HandlerExceptionResolver 接口

    -->
    <!--<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        &lt;!&ndash; 当出现异常时，默认处理的页面 (error代表的是一个视图) &ndash;&gt;
        <property name="defaultErrorView" value="error"/>
        &lt;!&ndash; 设置异常的变量名 &ndash;&gt;
        <property name="exceptionAttribute" value="ex"/>
        &lt;!&ndash; 设置自定义异常与视图的映射 &ndash;&gt;
        <property name="exceptionMappings">
            <props>
                &lt;!&ndash; key：异常类型  标签中的值表示处理异常的视图 &ndash;&gt;
                <prop key="com.shsxt.ssm.exception.BusinessException">bus_error</prop>
                <prop key="com.shsxt.ssm.exception.ParamsException">param_error</prop>
            </props>
        </property>
    </bean>-->




</beans>

db.propertis

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false
jdbc.username=root
jdbc.password=123456

log4j.properties

log4j.rootLogger=DEBUG, Console
# Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n
log4j.logger.java.sql.ResultSet=INFO
log4j.logger.org.apache=INFO
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="3.0"
         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">

  <!-- 启动spring容器-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring.xml</param-value>
  </context-param>
  <!-- 设置监听器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <!-- 编码过滤 utf-8 -->
  <filter>
    <description>char encoding filter</description>
    <filter-name>encodingFilter</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>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!-- servlet请求分发器 -->
  <servlet>
    <servlet-name>springMvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <!--加载spring mvc配置文件-->
      <param-value>classpath:servlet-context.xml</param-value>
    </init-param>
    <!-- 表示启动容器时初始化该Servlet -->
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springMvc</servlet-name>
    <!-- 这是拦截请求， "/"代表拦截所有请求，"*.do"拦截所有.do请求 -->
    <url-pattern>/</url-pattern>
    <!--<url-pattern>*.do</url-pattern>-->
  </servlet-mapping>


  <!-- 通过error-page标签设置异常处理，可以处理不同的状态码的页面 -->
  <error-page>
    <error-code>404</error-code>
    <location>/404.jsp</location>
  </error-page>
</web-app>

项目结构