SSM整合

查看不同MyBatis版本整合Spring时使用的适配包；

下载整合适配包

https://github.com/mybatis/spring/releases

  官方整合示例，jpetstore

https://github.com/mybatis/jpetstore-6

1. 搭建环境

创建一个动态的Maven--WEB工程（New Maven Project--->packing war）

导入SSM需要使用的jar包依赖信息

2 Spring + Springmvc

在web.xml中配置:   Springmvc的前端控制器   实例化Spring容器的监听器   字符编码过滤器  REST 过滤器

创建Spring的配置文件: applicationContext.xml:组件扫描、 连接池、 事务.....

创建Springmvc的配置文件: springmvc.xml : 组件扫描、 视图解析器 <mvc:...>

2.3 MyBatis

创建MyBatis的全局配置文件

编写实体类  Mapper接口  Mapper映射文件

2.4 Spring + MyBatis

MyBatis的 SqlSession的创建 .

MyBatis的 Mapper接口的代理实现类

 整合的配置

① 导入jar包  MyBatis、MySql、log4j、spring-context、spring-webmvc、mybatis-spring（整合的jar包）、druid、jstl等

② 在web.xml中配置：

前端控制器、监听器、页面中文乱码的配置；

    <!-- 配置前端控制器 -->
    <servlet>
        <servlet-name>springDispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!-- Map all requests to the DispatcherServlet for handling -->
    <servlet-mapping>
        <servlet-name>springDispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    
    <!-- 配置监听器 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:beans.xml</param-value>
    </context-param>

    <!-- Bootstraps the root web application context before servlet initialization -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

<!-- 页面中文乱码的配置 -->
    <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>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

 ③ beans.xml的配置

<?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:context="http://www.springframework.org/schema/context"
    xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"
    xsi:schemaLocation="http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring-1.2.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-4.0.xsd">
    <!-- 设置自动扫描的包，不扫描handler -->
    <context:component-scan base-package="com.atguigu.ssm">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    
    <!-- 引入外部属性文件 -->
    <context:property-placeholder location="classpath:druid.properties"/>
    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="driverClassName" value="${jdbc.driverClassName}"></property>
        <property name="initialSize" value="${jdbc.initialSize}"></property>
        <property name="minIdle" value="${jdbc.minIdle}"></property>
        <property name="maxActive" value="${jdbc.maxActive}"></property>
        <property name="maxWait" value="${jdbc.maxWait}"></property>
    </bean>
    <!-- 整合MyBatis -->
    <!-- 1.配置SqlSessionFactoryBean -->
    <bean  class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 配置数据源 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 配置MyBatis全局配置文件路径 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <!-- 配置Mapper接口的映射文件路径 -->
        <property name="mapperLocations" value="classpath:mybatis/*.xml"></property>
    
    </bean>
    
    <mybatis-spring:scan base-package="com.atguigu.ssm.mapper"/>    
</beans>

④ springmvc.xml的配置

<?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:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
    <!-- 设置自动扫描的包 -->
    <context:component-scan base-package="com.atguigu.ssm" use-default-filters="false">
        <!-- 设置只扫描包handler -->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>  //全类名，在handler包下面的.java文件中去取
    </context:component-scan>
    <!-- 配置试图解析器 -->    
    <bean id="" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/pages/"></property>    //pages目录下的，去拼；前缀
        <property name="suffix" value=".jsp"></property> 　　　//后缀
    </bean>
    <!-- 配置处理静态资源, -->
    <mvc:default-servlet-handler/>
    <mvc:annotation-driven></mvc:annotation-driven>
</beans>