SpringMVC：SSM整合

1、新建一个maven项目，添加web支持。

2、pom.xml

2.1、添加依赖

点击查看代码

<dependencies>
        <!-- SpringMVC -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.1</version>
        </dependency>
        <!-- ServletAPI -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
        <!-- mysql数据库驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.27</version>
        </dependency>
        <!-- junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
        </dependency>
        <!-- 数据库连接池：c3p0 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.5</version>
        </dependency>
        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.22</version>
        </dependency>
        <!-- ServletAPI -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.7</version>
        </dependency>
        <!-- mybatis整合spring：mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
        <!-- jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.13</version>
        </dependency>
        <!-- jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

    </dependencies>

2.2、maven项目，静态资源导出问题

这个配置只要是maven项目，就需要添加到pom.xml文件中

    <build>
        <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>
    </build>

3、web.xml

3.1 启动spring的容器

    <!-- 启动spring的容器 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

3.2 springmvc的前端控制器

 <!--配置springmvc前端过滤器,对浏览器发送的请求进行统一的处理-->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--设置springmvc配置文件存放的位置名称，如果不配置此项，springmvc配置文件的的位置位于类路径下，名称为(servlet-name)-servlet.xml-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <!--启动顺序，数字越小，启动越早-->
        <!--将前端控制器DispatcherServlet的初始化时间提前到服务器启动时-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <!--/，过滤所有请求，不包过jsp文件-->
        <!--/*，过滤所有请求，包过jsp文件-->
        <url-pattern>/</url-pattern>
    </servlet-mapping>

3.3 字符编码过滤器

 <!--设置字符编码-->
    <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>
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

3.4 使用Rest风格的URI

 <!-- 使用Rest风格的URI，将页面普通的post请求转为指定的delete或者put请求 -->
    <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>

点击查看代码

<?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springmvc前端过滤器,对浏览器发送的请求进行统一的处理-->
<servlet>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--设置springmvc配置文件存放的位置名称，如果不配置此项，springmvc配置文件的的位置位于类路径下，名称为(servlet-name)-servlet.xml-->
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <!--启动顺序，数字越小，启动越早-->
    <!--将前端控制器DispatcherServlet的初始化时间提前到服务器启动时-->
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>DispatcherServlet</servlet-name>
    <!--/，过滤所有请求，不包过jsp文件-->
    <!--/*，过滤所有请求，包过jsp文件-->
    <url-pattern>/</url-pattern>
</servlet-mapping>

<!--设置字符编码-->
    <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>
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>


   <!-- 使用Rest风格的URI，将页面普通的post请求转为指定的delete或者put请求 -->
<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>
</web-app>

4、db.properties

jdbc.driverClass=com.mysql.jdbc.Driver
#如果使用的是mybatis8.0+,需要配置一个时区
jdbc.jdbcUrl=jdbc:mysql:///test?characterEncoding=utf-8&serverTimezone=GMT%2B8
jdbc.user=root
jdbc.password=123

5、applicationContext.xml

5.1 开启注解自动扫描

    <!-- 开启注解自动扫描 -->
    <context:component-scan base-package="com.kw.ssm">
        <!-- spring容器不扫描控制器 -->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

5.2 引入外部db.properties文件

    <!-- 引入外部db.properties文件 -->
    <context:property-placeholder location="classpath:db.properties"/>

5.3 配置数据源

<!-- 配置c3p0数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driverClass}"></property>
        <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
        <property name="user" value="${jdbc.user}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

<!-- 配置dhcp连接池 -->
	<bean id="dataSource" 	class="org.apache.commons.dbcp.BasicDataSource">
		<property name="driverClassName" 	value="${jdbc.driverClass}"></property>
		<property name="url" value="${jdbc.jdbcUrl}"></property>
		<property name="username" value="${jdbc.user}"></property>
		<property name="password" value="${jdbc.password}"></property>
	</bean>

5.4 配置spring和mybatis整合

    <!-- 配置spring和mybatis整合 -->
    <bean id="sqlSessionFactory"  class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 指定mybatis全局配置文件的位置 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <!-- 引入数据源 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 配置mybatis的mapper文件位置 -->
        <!-- <property name="mapperLocations" value="classpath:com/kw/ssm/mapper/*.xml"></property>-->
    </bean>

5.5 配置扫描器：将mybatis接口的实现加入到ioc容器中

<!-- 配置扫描器：将mybatis接口的实现加入到ioc容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--扫描所有的dao接口实现，加入到ioc容器中-->
        <property name="basePackage" value="com.kw.ssm.mapper"></property>
    </bean>

5.6 配置声明式事务

 <bean  id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 控制住数据源 -->
        <property name="dataSource" ref="dataSource"></property>
    </bean>

5.7 开启基于注解的事务控制

 <!-- 开启基于注解的事务控制 -->
 <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>

5.8 配置基于xml配置形式的事务

<!-- 配置基于xml配置形式的事务 -->
	<aop:config>
		<!-- 切入点表达式 -->
		<aop:pointcut expression="execution(*       com.kw.spring.service..*(..))" id="txPoint"/>
	<!-- 配置事务增强 -->
	<aop:advisor advice-ref="txAdvice" pointcut-ref="txPoint"/>
	</aop:config>
	<tx:advice id="txAdvice">
		<tx:attributes>
			<!-- *代表所有方法都是事务方法 -->
			<tx:method name="*"/>
			<!-- 以get开头的所有方法 -->
			<tx:method name="get*" read-only="true"/>
		</tx:attributes>
	</tx:advice>

点击查看代码

<?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"
       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">

    <!-- 1、开启注解自动扫描 -->
    <context:component-scan base-package="com.kw.ssm">
        <!-- spring容器不扫描控制器 -->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!-- 引入外部db.properties文件 -->
    <context:property-placeholder location="classpath:db.properties"/>

    <!-- 配置c3p0数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driverClass}"></property>
        <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
        <property name="user" value="${jdbc.user}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

    <!-- 配置spring和mybatis整合 -->
    <bean id="sqlSessionFactory"  class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 指定mybatis全局配置文件的位置 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <!-- 引入数据源 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 配置mybatis的mapper文件位置 -->
        <!-- <property name="mapperLocations" value="classpath:com/kw/ssm/mapper/*.xml"></property>-->
    </bean>

    <!-- 配置扫描器：将mybatis接口的实现加入到ioc容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--扫描所有的dao接口实现，加入到ioc容器中-->
        <property name="basePackage" value="com.kw.ssm.mapper"></property>
    </bean>

    <bean  id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 控制住数据源 -->
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 开启基于注解的事务控制 -->
    <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>


</beans>

6、springmvc.xml

6.1 配置注解自动扫描

    <!-- 配置注解自动扫描 -->
    <context:component-scan base-package="com.kw.ssm" use-default-filters="false">
        <!-- 只扫描控制器 -->
        <context:include-filter  type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

6.2 配置视图解析器

InternalResourceViewResolver视图：
<a href="${pageContext.request.contextPath}/employee/getAll">查看所有员工信息</a>

    <!-- 配置视图解析器: 如何把 handler方法返回值解析为实际的物理视图 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

Thymeleaf视图：

<!--配置thymeleaf视图解析器-->
<bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
    <property name="order" value="1"/>
    <property name="characterEncoding" value="UTF-8"/>
    <property name="templateEngine">
        <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
            <property name="templateResolver">
                <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">
                    <!--视图前缀-->
                    <property name="prefix" value="/WEB-INF/templates/"/>
                    <!--视图后缀-->
                    <property name="suffix" value=".html"/>
                    <property name="templateMode" value="HTML5"/>
                    <property name="characterEncoding" value="UTF-8"/>
                </bean>
            </property>
        </bean>
    </property>
</bean>

FrameMark视图：

6.3 开启注解驱动

<mvc:annotation-driven/>

6.4 过滤静态资源

<mvc:default-servlet-handler/>

点击查看代码

<?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">

    <!--springmvc的三大核心是处理器映射器，处理器适配器，视图解析器-->
    <!--开启注解扫描-->
    <context:component-scan base-package="com.kw"></context:component-scan>
    <!--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>

    <!--让springmvc不去处理静态资源，如.css .js .html等-->
    <mvc:default-servlet-handler/>

    <!--开启mvc注解驱动,
    在springmvc中一般采用@RequestMapping注解来完成映射关系，
    要想使@RequestMapping注解生效，需要向上下文注册处理器映射器(DefaultAnnoationHandlerMapping),
    处理器适配器(AnnotationMethodHandlerAdapter)，
    annotation-driven这个配置就相当于自动配置了springmvc的处理器适配器和处理器映射器-->
    <mvc:annotation-driven/>
</beans>

7、mybatis.xml

由于在实际项目中，需要将mybatis与spring进行整合，将mybatis中的内容交于spring进行管理，所以mybatis配置文件是可以直接省略的，但我们一般建议结合使用，在mybatis配置文件中主要配置例如setting设置，typeAliases别名等配置，将数据源、mapper映射文件的配置转移到spring配置文件中进行配置。

点击查看代码

<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
    <properties resource="db.properties"></properties>

    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>

    <typeAliases>
        <package name="com.kw.ssm.pojo"/>
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driverClass}"/>
                <property name="url" value="${jdbc.jdbcUrl}"/>
                <property name="username" value="${jdbc.user}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper resource="com/kw/ssm/mapper/EmployeeMapper.xml"/>
    </mappers>
</configuration>