学习笔记——SSM整合（思路步骤）

Posted 2023-01-23 isDaHua

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2023-01-22

一、SSM整合

1、Spring + SpringMVC

（1）容器管理对象，由DispatcherServlet管理

（2）Spring容器对象，由ContextLoaderListener管理

2、解决组件扫描的冲突问题

（1）SpringMVC只扫描Controller层

（2）Spring扫描排除Controller层

2、Spring+Mybatis

（1）关于数据源、事务管理的代码冲突问题

同意交给Spring管理

（2）Spring管理Mybatis核心对象

①SqlSessionFactory

②Mapper代理对象

二、SSM整合步骤

1、Spring + SpringMVC

（1）导入jar包

<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.1</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.thymeleaf/thymeleaf-spring5 -->
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf-spring5</artifactId>
            <version>3.0.12.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>

（2）配置文件

①web.xml

a.注册CharacterEncodingFilter，解决请求乱码问题

b.注册HiddenHttpMethodFilter，支持PUT&DELETE提交【REST风格】

c.注册DispatcherServlet（前端控制器），管理springMVC容器对象

d.注册一个上下文参数（contextConfigLocation），设置spring.xml配置文件路径

e.注册ContextLoaderListener，管理spring容器对象（目的是为了加载spring的配置文件，帮我们初始化IOC容器）

<?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">
    <!--    d.注册一个上下文参数（contextConfigLocation），设置spring.xml配置文件路径-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring.xml</param-value>
    </context-param>
    <!--    e.注册ContextLoaderListener，管理spring容器对象-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!--    a.注册CharacterEncodingFilter，解决请求乱码问题-->
    <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>/*</url-pattern>
    </filter-mapping>

<!--    b.注册HiddenHttpMethodFilter，支持PUT&DELETE提交【REST风格】-->
    <filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

<!--    c.注册DispatcherServlet（前端控制器），管理springMVC容器对象-->
    <servlet>
        <servlet-name>DispatcherServlet</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>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

②springMVC.xml

a.开启组件扫描（只扫描Controller）

b.装配视图解析器

c.装配视图控制器（view-controller）

d.装配"default-servlet-handler"，解决静态资源加载问题

e.装配"annotation-driven"，解决后续问题

解决view-controller问题、解决default-servlet-handler问题、解决Jackon配置消息转换器问题

<?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">

<!--    a.开启组件扫描（只扫描Controller）-->
    <context:component-scan base-package="com.hh" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
<!--    b.装配视图解析器-->
    <bean class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
        <property name="characterEncoding" value="UTF-8"></property>
        <property name="templateEngine">
            <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                <property name="templateResolver">
                    <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">
                        <property name="characterEncoding" value="UTF-8"></property>
                        <property name="prefix" value="WEB-INF/pages/"></property>
                        <property name="suffix" value=".html"></property>
                    </bean>
                </property>
            </bean>
        </property>
    </bean>
<!--    c.装配视图控制器（view-controller）-->
    <mvc:view-controller path="/" view-name="index"></mvc:view-controller>
<!--    d.装配"default-servlet-handler"，解决静态资源加载问题-->
    <mvc:default-servlet-handler></mvc:default-servlet-handler>
<!--    e.装配"annotation-driven"，解决后续问题-->
    <mvc:annotation-driven></mvc:annotation-driven>
</beans>

③spring.xml

开启组件扫描（排除Controller层）

<?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"
       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">

<!--    开启组件扫描-->
    <context:component-scan base-package="com.hh">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
</beans>

2、Spring+Mybatis

（1）导入jar包

①spring的jar包

<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.10</version>
        </dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-orm -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>5.3.10</version>
        </dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>5.3.10</version>
        </dependency>

②mybatis的jar包

<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
 <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.26</version>
        </dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>
<!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.0.0</version>
        </dependency>

③spring与mybatis整合jar包

<dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>

（2）配置文件

①spring.xml

a.开启组件扫描（排除Controller层）

b.加载外部属性文件

c.装配数据源（DruidDataSource）

d.装配事务管理器（DataSourceTransactionManager）

e.开启声明式事务管理注解支持

f.装配SqlSessionFactoryBean，管理SqlSessionFactory

g.装配MapperScannerConfigurer，管理Mapper代理对象

<?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"
       xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"
       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 http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring.xsd">

    <!--    a.开启组件扫描（排除Controller层）-->
    <context:component-scan base-package="com.hh">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
<!--    b.加载外部属性文件-->
    <context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
<!--    c.装配数据源（DruidDataSource）-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="$db.driverClassName"></property>
        <property name="url" value="$db.url"></property>
        <property name="username" value="$db.username"></property>
        <property name="password" value="$db.password"></property>
    </bean>
<!--    d.装配事务管理器（DataSourceTransactionManager）-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
<!--    e.开启声明式事务管理注解支持-->
    <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>

    <!--    f.装配SqlSessionFactoryBean，管理SqlSessionFactory-->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--        设置数据源-->
        <property name="dataSource" ref="dataSource"></property>
<!--        设置mybatis-config.xml核心配置文件路径-->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>

<!--        设置类型别名-->
        <property name="typeAliasesPackage" value="com.hh.pojo"></property> <!-- 设置映射文件路径--> <property name="mapperLocations" value="classpath:/mapper/*.xml"></property> </bean> <!-- g.装配MapperScannerConfigurer，管理Mapper代理对象--> <mybatis-spring:scan base-package="com.hh.mapper"></mybatis-spring:scan> </beans>

②springmvc.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: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">

<!--    a.开启组件扫描（只扫描Controller）-->
    <context:component-scan base-package="com.hh" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
<!--    b.装配视图解析器-->
    <bean class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
            <property name="characterEncoding" value="UTF-8"></property>
            <property name="templateEngine">
                <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                    <property name="templateResolver">
                        <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">
                            <property name="characterEncoding" value="UTF-8"></property>
                            <property name="prefix" value="WEB-INF/pages/"></property>
                            <property name="suffix" value=".html"></property>
                        </bean>
                    </property>
                </bean>
            </property>
        </bean>
<!--    c.装配视图控制器（view-controller）-->
    <mvc:view-controller path="/" view-name="index"></mvc:view-controller>
<!--    d.装配"default-servlet-handler"，解决静态资源加载问题-->
    <mvc:default-servlet-handler></mvc:default-servlet-handler>
<!--    e.装配"annotation-driven"，解决后续问题-->
    <mvc:annotation-driven></mvc:annotation-driven>
</beans>

③mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <settings>
<!--        开启自动驼峰式命名映射-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
<!--       开启延迟加载-->
        <setting name="lazyLoadingEnabled" value="true"/>
<!--        延迟加载的属性-->
        <setting name="aggressiveLazyLoading" value="false"/>
<!--        开启二级缓存-->
        <setting name="cacheEnabled" value="true"/>
    </settings>

<!--    添加分页插件-->
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
    </plugins>

</configuration>

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