Spring + SpringMVC + MyBatis 整合

1、依赖

　　基于空的maven项目；

 <dependencies>
        <!-- https://mvnrepository.com/artifact/junit/junit -->
        <!--测试依赖包-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>
        <!--spring依赖-->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.4.RELEASE</version>
        </dependency>
        <!--spirng操作数据库依赖-->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.4.RELEASE</version>
        </dependency>
        <!--mysql数据库连接依赖-->
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.48</version>
        </dependency>
        <!-- 数据库连接池 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

        <!--mybatis依赖-->
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.4</version>
        </dependency>
        <!--mybatis整合spring依赖-->
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.3</version>
        </dependency>
        <!--spring mvc依赖-->
        <!-- 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>
        <!--jsp依赖-->
        <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.3.3</version>
            <scope>provided</scope>
        </dependency>
        <!--jstl依赖-->
        <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
    </dependencies>


    <build>
        <!--配置打包时不过滤非java文件开始  -->
        <!--说明，在进行模块化开发打jar包时，maven会将非java文件过滤掉，
        xml,properties配置文件等，但是这些文件又是必需的，
        使用此配置可以在打包时将不会过滤这些必需的配置文件。
        -->
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
        <!--配置打包时不过滤非java文件结束 -->
    </build>

2、整合MyBatis

　　2.1 在resource下新建一个mybatis-config.xml 配置文件；

<?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>

   
</configuration>

　　2.2 再建一个spring的核心配置文件applicationContext.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">

 
</beans>

　　2.3 新建一个数据库连接信息配置文件：datasource.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&CharacterEncoding=utf-8&useUnicode=true&serverTimezone=UTC
jdbc.user=root
jdbc.password=123456

　　2.4 这时可以补齐java目录下的包；dao（mapper）、service、controller、pojo（bean）;

　　2.5 这时新建一个spring-mapper.xml，用于配置数据库连接串、数据库连接池、sqlSessionFactory和spring自动扫描mapper包自动注入 xxxMapper.xml文件；不然就要手动注入了；

<?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">

    <!--0、导入数据库信息配置-->
    <!--<context:properties location="datasource.properties" />-->
    <context:property-placeholder location="classpath:datasource.properties"></context:property-placeholder>

    <!--1、配置数据库信息-->
    <!--2、配置连接源，这里使用的c3p0的数据源，没用spring自带的-->
    <bean class="com.mchange.v2.c3p0.ComboPooledDataSource" id="dataSource">
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.user}"></property>
        <property name="password" value="${jdbc.password}"></property>

        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>


    <!--3、提供SqlSessionFactory
            关联数据源；
            关联mybatis配置文件
    -->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactory">
        <property name="dataSource" ref="dataSource"></property>
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
    </bean>

    <!--4、自动扫描mapper文件，动态的实现了Dao接口注入到spirng容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
        <!--扫描mapper包，实现动态注入-->
        <property name="basePackage" value="com.doubleh.mapper"></property>
    </bean>

</beans>

3、整合Spring

　　新建一个spring-service.xml，负责业务处理的配置；

　　这一步整合好了，可以测试下数据库连接和数据获取是否正常了。

<?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">

    <!--1、自动扫描service 的bean-->
    <context:component-scan base-package="com.doubleh.service"></context:component-scan>

    <!--2.将我们的所有业务类注入spring容器中，可以通过配置或者注解注入-->

    <!--3、声明式事务支持-->
    <bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager" id="dataSourceTransactionManager">
        <!--注入dataSource-->
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--4、AOP 有需要的话在这边配置-->

</beans>

4、整合SpringMVC

　　4.1 项目添加web应用；

　　4.2 web.xml 添加 DispatcherServlet 和 乱码过滤；

<?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">

    <!--配饰spring mvc 的servlet调度器-->
    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--配置spring容器-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <!--设置启动级别-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--乱码过滤-->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

</web-app>

　　4.3 新建一个spring-mvc.xm配置文件；

　　　　处理controller层业务，配置mvc的注解驱动，忽略静态资源、扫描controller层，添加beanName和url的处理映射器配置、controller处理适配器配置和视图解析配置；

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

    <!--1、配置spring mvc注解驱动-->
    <mvc:annotation-driven />

    <!--2、配置mvc忽略静态资源的调度-->
    <mvc:default-servlet-handler />

    <!--3、扫描controller包，自动注入-->
    <context:component-scan base-package="com.doubleh.controller"></context:component-scan>

    <!--4、配置bean名和url处理映射器-->
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>

    <!--5、配置controller处理适配器-->
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>

    <!--6、配置视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>

5、测试

　　用于测试数据库连接是否正常；

 @Test
    public void test1(){
       ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
       BookService bean = (BookService) context.getBean("bookServiceImpl");
        List<Books> books = bean.queryAll();
        for (Books book : books) {
            System.out.println(book);
        }
    }

6、问题

　　6.1 报404错误

　　　　查看控制台输出，看一下是不是缺少了什么jar包。

　　　　如果jar包存在，显示无法输出，就在IDEA的项目发布中，添加lib依赖！

　　　　如果lib依赖没问题，就查看下spring-mvc相关配置是否正确。比如：视图解析器中前后缀是否写错了。