學習筆記——SSM整合（思路、步驟）

2023-01-22 一、SSM整合 1、Spring + SpringMVC （1）容器管理對象，由DispatcherServlet管理（2）Spring容器對象，由ContextLoaderListener管理 2、解決組件掃描的衝突問題（1）SpringMVC只掃描Controller層 ...

2023-01-22

一、SSM整合

1、Spring + SpringMVC

（1）容器管理對象，由DispatcherServlet管理

（2）Spring容器對象，由ContextLoaderListener管理

2、解決組件掃描的衝突問題

（1）SpringMVC只掃描Controller層

（2）Spring掃描排除Controller層

2、Spring+Mybatis

（1）關於數據源、事務管理的代碼衝突問題

同意交給Spring管理

（2）Spring管理Mybatis核心對象

①SqlSessionFactory

②Mapper代理對象

二、SSM整合步驟

1、Spring + SpringMVC

（1）導入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.註冊CharacterEncodingFilter，解決請求亂碼問題

b.註冊HiddenHttpMethodFilter，支持PUT&DELETE提交【REST風格】

c.註冊DispatcherServlet（前端控制器），管理springMVC容器對象

d.註冊一個上下文參數（contextConfigLocation），設置spring.xml配置文件路徑

e.註冊ContextLoaderListener，管理spring容器對象（目的是為了載入spring的配置文件，幫我們初始化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.註冊一個上下文參數（contextConfigLocation），設置spring.xml配置文件路徑-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring.xml</param-value>
    </context-param>
    <!--    e.註冊ContextLoaderListener，管理spring容器對象-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!--    a.註冊CharacterEncodingFilter，解決請求亂碼問題-->
    <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.註冊HiddenHttpMethodFilter，支持PUT&DELETE提交【REST風格】-->
    <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.註冊DispatcherServlet（前端控制器），管理springMVC容器對象-->
    <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.開啟組件掃描（只掃描Controller）

b.裝配視圖解析器

c.裝配視圖控制器（view-controller）

d.裝配"default-servlet-handler"，解決靜態資源載入問題

e.裝配"annotation-driven"，解決後續問題

解決view-controller問題、解決default-servlet-handler問題、解決Jackon配置消息轉換器問題

<?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.開啟組件掃描（只掃描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.裝配視圖解析器-->
    <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.裝配視圖控制器（view-controller）-->
    <mvc:view-controller path="/" view-name="index"></mvc:view-controller>
<!--    d.裝配"default-servlet-handler"，解決靜態資源載入問題-->
    <mvc:default-servlet-handler></mvc:default-servlet-handler>
<!--    e.裝配"annotation-driven"，解決後續問題-->
    <mvc:annotation-driven></mvc:annotation-driven>
</beans>

③spring.xml

開啟組件掃描（排除Controller層）

<?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">

<!--    開啟組件掃描-->
    <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）導入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與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.開啟組件掃描（排除Controller層）

b.載入外部屬性文件

c.裝配數據源（DruidDataSource）

d.裝配事務管理器（DataSourceTransactionManager）

e.開啟聲明式事務管理註解支持

f.裝配SqlSessionFactoryBean，管理SqlSessionFactory

g.裝配MapperScannerConfigurer，管理Mapper代理對象

<?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.開啟組件掃描（排除Controller層）-->
    <context:component-scan base-package="com.hh">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
<!--    b.載入外部屬性文件-->
    <context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
<!--    c.裝配數據源（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.裝配事務管理器（DataSourceTransactionManager）-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
<!--    e.開啟聲明式事務管理註解支持-->
    <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>

    <!--    f.裝配SqlSessionFactoryBean，管理SqlSessionFactory-->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--        設置數據源-->
        <property name="dataSource" ref="dataSource"></property>
<!--        設置mybatis-config.xml核心配置文件路徑-->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>

<!--        設置類型別名-->
        <property name="typeAliasesPackage" value="com.hh.pojo"></property> <!-- 設置映射文件路徑--> <property name="mapperLocations" value="classpath:/mapper/*.xml"></property> </bean> <!-- g.裝配MapperScannerConfigurer，管理Mapper代理對象--> <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.開啟組件掃描（只掃描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.裝配視圖解析器-->
    <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.裝配視圖控制器（view-controller）-->
    <mvc:view-controller path="/" view-name="index"></