ssm分别是spring（springframework）、springmvc、mybatis。

1、在pom.xml中引入依赖，共计13个。根据需求或多或少。

测试	Junit、Spirng-test
工具	lombok、druid、jackson、jstl、javax-servlet.api
框架	spring-webmvc、spring-aop、mybatis-spring、mabatis
数据库	spring-jdbc、mysql-connection-java

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>11</maven.compiler.source>
    <maven.compiler.target>11</maven.compiler.target>
    <spring.version>5.3.14</spring.version>
    <mybatis-spring.version>2.0.6</mybatis-spring.version>
    <mybatis.version>3.5.7</mybatis.version>
    <druid.version>1.2.8</druid.version>
    <mysql.version>8.0.27</mysql.version>
    <jackson.version>2.13.1</jackson.version>
    <servlet.version>4.0.1</servlet.version>
    <lombok.version>1.18.20</lombok.version>
    <jstl.version>1.2</jstl.version>
    <junit.version>4.13.2</junit.version>
  </properties>

  <dependencies>
<!--    spring mvc-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
<!--spring aop-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${spring.version}</version>
    </dependency>
<!--    spring - jdbc-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>
<!--    mybatis - spring-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${mybatis-spring.version}</version>
    </dependency>
<!--mybatis-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
<!--    mysql-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql.version}</version>
    </dependency>
<!--druid-->
      <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>druid</artifactId>
          <version>${druid.version}</version>
      </dependency>
<!--jackson解码-->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>${jackson.version}</version>
    </dependency>
<!--servlet-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
      <scope>provided</scope>
    </dependency>
<!--lombok-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>${lombok.version}</version>
    </dependency>
<!--jstl-->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>${jstl.version}</version>
    </dependency>
<!--spring - test-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>
<!--    junit-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>${junit.version}</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

2、配置web.xml，首先配置初始化配置文件路径和服务器启动时初始化。通过监听器添加其他需要初始化的配置文件（为了解决启动报错的问题）。

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
         http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

<!--    为监听器提供初始化参数-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-mybatis.xml</param-value>
    </context-param>
    
<!--    避免出现内存溢出-->
    <listener>
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
    </listener>

<!--    Context容器装载-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
<!--    解码问题-->
    <filter>
        <filter-name>CharacterEncodingFilter</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>forceRequestEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>*.do</url-pattern>
    </filter-mapping>

    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--        指定mvc配置文件路径-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
<!--        服务器启动阶段初始化-->
        <load-on-startup>0</load-on-startup>
    </servlet>
    
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    
</web-app>

3、逻辑层配置文件mybatis.xml。首先实例化逻辑层和数据层，添加数据库连接池和基于数据源的事务管理器。实例化SqlSessionFactory对象，配置数据源、各sql语句包以及实体类对象。然后整合spring和mybatis，通过调用数据层接口的方法，就可以实现调用SqlSessionFactory对象，然后找到对应的配置文件和数据源，通过数据库连接池对象从数据库获得数据返回。

<?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: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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

<!--    扫描并实例化，排除控制层-->
    <context:component-scan base-package="com.zhang.ssm">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

<!--    读取配置文件，获得数据库连接参数-->
    <context:property-placeholder location="classpath:datasource.properties"/>

    <!--    创建durid数据库连接池-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="maxActive" value="${druid.maxActive}"/>
        <property name="minIdle" value="${druid.minIdle}"/>
        <property name="initialSize" value="${druid.initialSize}"/>
    </bean>

<!--    基于数据源的事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!--            传入数据源-->
        <constructor-arg ref="dataSource"/>
    </bean>

<!--    为基于注解型事务提供注解支持-->
    <tx:annotation-driven transaction-manager="transactionManager"/>

<!--    把mybatis下的容器交由ioc容器管理-->
    <bean id="sessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--        注入数据源-->
        <property name="dataSource" ref="dataSource"/>
<!--        扫描指定路径下的所有配置文件-->
        <property name="mapperLocations" value="classpath:/mappers/*.xml"/>
<!--        为实体类包类型提供简化别名-->
        <property name="typeAliasesPackage" value="com.zhang.ssm.*.entity"/>
<!--        提供配置-->
        <property name="configuration">
            <bean class="org.apache.ibatis.session.Configuration">
<!--                启用驼峰命名-->
                <property name="mapUnderscoreToCamelCase" value="true"/>
<!--                向控制台执行输出sql-->
                <property name="logImpl" value="org.apache.ibatis.logging.stdout.StdOutImpl"/>
            </bean>
        </property>
    </bean>

<!--        Spring 与 mybatis整合-->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--            扫描指定路径，实现匹配数据层接口-->
            <property name="basePackage" value="com.zhang.ssm.*.dao"/>
<!--            注入mybatis  sqlsessionfactory-->
            <property name="sqlSessionFactoryBeanName" value="sessionFactoryBean"/>
        </bean>

</beans>

4、mvc配置文件，只需要实例化控制层接口即可。

    <context:component-scan base-package="com.zhang.ssm" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>