SSM整合

spring + spring mvc + mybatis

spring ：整合型/设计型

spring mvc : 控制层

mybatis：持久层

  1. 涉及 的ioc容器：spring mvc+ spring 的容器
  2. 关系：父子关系
  3. 子容器可以访问父容器的bean，但是父容器不能访问子容器的bean
  4. 在ServletContextLinsliner中获取Spring ioc容器
配置名 对应内容 对应容器
spring-mvc.xml controller,springmvc相关 web容器
spring-service.xml service,aop,tx相关 root容器
spring-mapper.xml mapper,datasource,mybatis相关 root容器

配置spring的ioc配置。让DipatcherServelet在初始化时，加载spring ioc的容器作为父容器，ContextLoaderListener会在服务器启动时运行。

三个spring配置文件:

  1. spring-service.xml spring-ioc 父容器

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

        <context:property-placeholder location="classpath:jdbc.properties" />

        <context:component-scan base-package="online.zorange" >
            <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.RestController"/>
        </context:component-scan>



        <bean class="com.alibaba.druid.pool.DruidDataSource" id="dataSource">
            <property name="driverClassName" value="${jdbc.driver}"/>
            <property name="url" value="${jdbc.url}"/>
            <property name="username" value="${jdbc.name}"/>
            <property name="password" value="${jdbc.password}"/>
        </bean>

        <aop:aspectj-autoproxy />
        <bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager" id="transactionManager" >
            <property name="dataSource" ref="dataSource" />
        </bean>

        <tx:annotation-driven transaction-manager="transactionManager" />

        <import resource="spring-mapper.xml" />
    </beans>

  2. spring-mvc.xml spring-mvc的ioc容器，管理controller

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

        <context:component-scan base-package="online.zorange.controller" />

        <mvc:annotation-driven/>
    </beans>

    web.xml 配置DispacherServelet

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    <?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">
        <!-- 配置Spring MVC的DispatcherServlet -->
        <servlet>
            <!-- 指定servlet的名称为"spring-mvc" -->
            <servlet-name>spring-mvc</servlet-name>
            <!-- 指定servlet的类为Spring的DispatcherServlet -->
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <!-- 配置DispatcherServlet的初始化参数，指定Spring MVC配置文件的位置 -->
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:spring-mvc.xml</param-value>
            </init-param>
            <!-- 指定该servlet在web应用启动时即加载和创建，优先级为1 -->
            <load-on-startup>1</load-on-startup>
        </servlet>
        <!-- 映射servlet名称"spring-mvc"到所有请求的URL模式"/" -->
        <servlet-mapping>
            <servlet-name>spring-mvc</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>

        <!-- 配置应用上下文的初始化参数，指定Spring服务层配置文件的位置 -->
        <context-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-service.xml</param-value>
        </context-param>
        <!-- 注册Spring的监听器，用于在应用启动时加载Spring应用上下文 -->
        <listener>
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>

    </web-app>

  3. spring-mapper.xml spring整合MyBatis的配置文件

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    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

        <bean class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource" />
    <!--        设置配置文件位置-->
            <property name="configLocation" value="classpath:mybatis-config.xml" />
    <!--        设置映射文件位置-->
            <property name="mapperLocations" value="classpath:mapper/*Mapper.xml" />
    <!--        设置别名-->
            <property name="typeAliasesPackage" value="online.zorange.entity" />
        </bean>

    <!--    设置Mapper扫描的包名-->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <property name="basePackage" value="online.zorange.mapper" />
        </bean>

    </beans>

    mybati-config.xml mybatis的核心配置文件，可以通过整合配置文件来配置，两个一起配置也可以。

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    <?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>
        <!--引入jdbc.properties-->
        <properties resource="jdbc.properties"/>

        <settings>
            <!-- 将xxx_xxx这样的列名自动映射到xxXxx这样驼峰式命名的属性名 -->
            <setting name="mapUnderscoreToCamelCase" value="true"/>
            <!--开启resultMap自动映射 -->
            <setting name="autoMappingBehavior" value="FULL"/>
        </settings>
        <!--        设置别名-->
        <typeAliases>
            <package name="online.zorange.entity"/>
        </typeAliases>

        <plugins>
            <plugin interceptor="com.github.pagehelper.PageInterceptor">
                <property name="helperDialect" value="mysql"/>
            </plugin>
        </plugins>
    </configuration>