SSM整合（一）

博主：牛宝宝
发布时间：2021-04-16 17:05:51
642 次浏览
📚后端
Java ,Spring

项目结构：

新建maven项目，添加web框架支持，在pom中添加依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>SSMTest</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>SSMbuild</artifactId>
    <!--    公共依赖-->
    <dependencies>
        <!--junit测试-->
        <!-- https://mvnrepository.com/artifact/junit/junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <!--spring-->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.4</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.5</version>
        </dependency>
        <!--jsp  servlet-->
        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/jsp-api -->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
            <scope>provided</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!--mybatis-->
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <!--数据库链接-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.22</version>
        </dependency>
        <!--c3p0连接池-->
        <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <!--spring整合mybatis：注意spring使用5.0以上，mybatis使用3.5以上，需要使用2.0开头的mybatis-spring-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
        <!--切面-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.6</version>
        </dependency>

        <!--lombok-->
        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok 方便pojo-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
            <scope>provided</scope>
        </dependency>
        <!--log-->
        <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.12.1</version>
        </dependency>

    </dependencies>
    <!--防止在编译的时候，不导出java文件夹下的mapper.xml文件 -->
    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>
</project>

一个javaWeb项目的入口是web.xml，所以现在去编写web.xml。spring能整合很多框架，包括springmvc,本应该使用springmvc作为核心url分发器，但是现在将springmvc交给spring整合，所以配置分发器的servlet配置成spring对应的xml文件applicationContext.xml即可，在web.xml中还配置了编码过滤，欢迎界面，还可以配置404,500等错误页面，web.xml:

<?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dispatcher核心分发器-->
        <servlet>
            <servlet-name>springmvc</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:applicationContext.xml</param-value>
            </init-param>
        </servlet>
        <servlet-mapping>
            <servlet-name>springmvc</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
        <!--配置过滤乱码-->
        <filter>
            <filter-name>encodingFilter</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>
        </filter>
        <filter-mapping>
            <filter-name>encodingFilter</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>
        <!--设置session过期时间-->
        <session-config>
            <session-timeout>15</session-timeout>
        </session-config>
    <!--项目启动的欢迎界面-->
    <welcome-file-list>
        <welcome-file>/index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

applicationContext.xml中引用其他的配置文件：

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">
        <import resource="spring-mybatis.xml"/>
        <import resource="spring-mvc.xml"/>
        <import resource="spring-service.xml"/>
</beans>

spring-mybatis.xml：spring整合mybatis。设置数据库链接需要的数据源，配置连接信息，绑定mybatis的配置文件，配置sqlSessionFactory,配置mapper自动扫描，配置将dao层中的Mapper接口类注入到spring中。spring-mybatis.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:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">
    <!--导入外部数据库配置文件:多个文件使用逗号隔开，同属性名，取加载在最后的那个属性-->
    <context:property-placeholder location="classpath:db.properties" file-encoding="UTF-8"/>
    <!--使用spring的数据源替换mybatis的配置 c3p0：自动化加载配置文件，并且可以自动设置到对象
        dbcp:半自动，需要手动链接
        使用Spring提供的jdbc:org.springframework.jdbc.dataSource.DriverManagerDataSource
    -->
    <!--使用c3p0-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbcDriver}"/>
        <property name="jdbcUrl" value="${jdbcUrl}"/>
        <property name="user" value="${jdbcUsername}"/>
        <property name="password" value="${jdbcPassword}"/>
        <!-- 如果池中数据连接不够时一次增长多少个 -->
        <property name="acquireIncrement" value="5"/>
        <!-- 初始化连接数 -->
        <property name="initialPoolSize"  value="5"/>
        <!-- 最小连接数 -->
        <property name="minPoolSize" value="5"/>
        <!-- 最大连接数 -->
        <property name="maxPoolSize" value="40"/>
        <!-- JDBC的标准参数，用以控制数据源内加载的PrepareStatements数量 -->
        <property name="maxStatements" value="200"/>
        <!-- 连接池内单个连接所拥有的最大缓存statements数 -->
        <property name="maxStatementsPerConnection" value="5"/>
    </bean>
    <!--注册sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--绑定Mybatis的配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
    <!--配置dao层的mapper自动扫描，动态实现Dao中的接口可以注册到spring的容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" >
        <!--扫描的时候动态的将sqlSessionFactory加载到sqlSessionFactoryBeanName中,自动生成session-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--注入扫描的包名-->
        <property name="basePackage" value="dao"/>
    </bean>
</beans>

db.properties:

jdbcDriver=com.mysql.cj.jdbc.Driver
jdbcUrl=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
jdbcUsername=root
jdbcPassword=123456

mybatis-config.xml绑定的mybatis的配置文件（设置别名，和一些mybatis的设置等）：

<?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">
<!--核心配置文件-->
<configuration>
    <!--注意设置的顺序-->
    <!--mybatis设置-->
    <settings>
        <!--文档官网查看功能解释https://mybatis.org/mybatis-3/zh/configuration.html#settings-->
        <setting name="mapUnderscoreToCamelCase" value="false"/>
        <!--日志打印,可设置别的日志，参考官网文档-->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
    <!--可设置别名-->
    <typeAliases>
        <!--规定javaBean的别名，可在mapper.xml中直接使用别名-->
        <!-- <typeAlias type="pojo.User" alias="User"/>-->
        <!--自动扫描包，包下的javaBean自动设置别名，使用时使用类名的首字母小写即可,可用注解@Alis方式给Javabean起别名-->
        <package name="pojo"/>
    </typeAliases> 
</configuration>

spring-mvc.xml配置说明：设置注解驱动，设置静态资源过滤，设置扫描controller包,控制url跳转，controller下的注释都能被扫描到，设置视图解析器。这个配置完成后，项目中就可以适应@Controller,@Autowired等注释，自动注入

<?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">
        <!--注解驱动-->
        <mvc:annotation-driven/>
        <!--静态资源过滤-->
        <mvc:default-servlet-handler/>
        <!--扫描包-->
        <context:component-scan base-package="controller"/>
        <!--视图解析器-->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/jsp/"/>
            <property name="suffix" value=".jsp"/>
        </bean>
        <!--springMVC配置json乱码-->
        <mvc:annotation-driven>
            <mvc:message-converters register-defaults="true">
                <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                    <constructor-arg value="UTF-8"/>
                </bean>
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                    <property name="objectMapper">
                        <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
                            <property name="failOnEmptyBeans" value="false"/>
                        </bean>
                    </property>
                </bean>
            </mvc:message-converters>
        </mvc:annotation-driven>
</beans>

配置spring-service.xml:为了清楚，吧这个单独拿出来，对应service层，配置扫描service的注释生效，声明事务，可以配置切面，切点：

<?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:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://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
        https://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">
        <!--1.扫描service下面的包,service包下的@Service等注解都可被扫描到-->
        <context:component-scan base-package="service"/>
        <!--2.通过开启注解的方式，将所有业务类注入spring-->
<!--        <bean class="service.UserServiceImpl" id="userServiceImpl">-->
<!--                <property name="userMapper" ref="userMapper"/>-->
<!--        </bean>-->
        <context:annotation-config/>
        <!--3.声明式事务-->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <constructor-arg ref="dataSource" />
        </bean>
        <!--结合Aop实现事务的织入-->
        <!--配置事务通知-->
        <tx:advice id="txAdvice" transaction-manager="transactionManager">
            <!--给哪些方法配置事务-->
            <!--配置事务的传播特性  propagation 默认REQUIRED-->
            <tx:attributes>
                <!--                <tx:method name="add*" propagation="REQUIRED"/>-->
                <!--                <tx:method name="delete*"/>-->
                <!--                <tx:method name="update*"/>-->
                <!--                <tx:method name="insert*"/>-->
                <!--                <tx:method name="query*" read-only="true"/>-->
                <tx:method name="*" propagation="REQUIRED"/>
            </tx:attributes>
        </tx:advice>
        <!--配置事务切入-->
        <!--        <aop:aspectj-autoproxy proxy-target-class="true"/>-->
        <aop:config>
            <aop:pointcut id="txPointcut" expression="execution(* dao.*.*(..))"/>
            <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/>
        </aop:config>
</beans>