SSM整合——从零开始创建SSM

创建Maven项目

导入常用依赖

 <dependencies>

        <!--        Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!--        数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.22</version>
        </dependency>

        <!--        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>

        <!--        mybatis-->
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.3</version>
        </dependency>

        <!--        mybatis-spring-->
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.5</version>
        </dependency>

        <!--    servlet-->
        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
        </dependency>

        <!--        jsp-->
        <!-- 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>
        </dependency>

        <!--        jstl-->
        <!-- jstl -->
        <dependency>
            <groupId>javax.servlet.jsp.jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- jstl-api -->
        <dependency>
            <groupId>javax.servlet.jsp.jstl</groupId>
            <artifactId>jstl-api</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- jstl-impl -->
        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>jstl-impl</artifactId>
            <version>1.2</version>
        </dependency>

        <!--    spring-core-->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.2.9.RELEASE</version>
        </dependency>

        <!--    webmvc-->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.9.RELEASE</version>
        </dependency>

        <!--        spring-jdbc-->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.9.RELEASE</version>
        </dependency>

        <!--    lombok-->
        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.16</version>
        </dependency>

        <!--    gson-->
        <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.5</version>
        </dependency>

        <!--    aop依赖-->
        <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.6</version>
        </dependency>

        <!--        fileupload-->
        <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
        </dependency>


        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.23</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>4.3.13.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.14</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.14</version>
        </dependency>

    </dependencies>

导入依赖之后，等maven下载完毕，在项目结构下的Artifacts创建lib文件夹，将maven中所有的包手动添加到lib下，不添加的话，后续整合到springMVC时会找不到对应包。

根据自己的数据库，创建对应的实体类

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Admin {
    private Integer a_id;
    private String a_username;
    private String a_password;
    private String a_name;
    private String a_phone;
    private String a_power;
    private String a_describe;
}
     ········

整合MyBatis

创建数据库配置文件

    jdbc.driver=com.mysql.cj.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/dormitory?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
    jdbc.username=root
    jdbc.password=root

创建mybatis-config.xml,有一些基础配置（如：驼峰命名、日志输出、别名），绑定mapper

<?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>

    <settings>
        <!--        标准日志工厂-->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
        <!--        <setting name="logImpl" value="LOG4J"/>-->
    </settings>

    <!--每个mapper都需要注册-->
    <mappers>
<!--        每一个Dao接口都需要一个mapper对应-->
        <mapper resource="mapper/adminmapper.xml"/>
    </mappers>
</configuration>

创建spring-dao.xml,做一些连接池（c3p0）、DataSource、SqlSessionFactory、Dao接口自动注入的配置，并且绑定mybatis-config.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:c="http://www.springframework.org/schema/c"
       xmlns:p="http://www.springframework.org/schema/p"
       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">

<!--    引入数据库文件-->
    <context:property-placeholder location="classpath:db.properties"/>

<!--    配置连接池-->
    <bean class="com.mchange.v2.c3p0.ComboPooledDataSource" id="dataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        
<!--&lt;!&ndash;        最大连接池大小&ndash;&gt;-->
<!--        <property name="maxPoolSize" value="30"/>-->
<!--&lt;!&ndash;        最小连接池大小&ndash;&gt;-->
<!--        <property name="minPoolSize" value="10"/>-->
<!--&lt;!&ndash;        &ndash;&gt;-->
<!--        <property name="autoCommitOnClose" value="false"/>-->
<!--&lt;!&ndash;        最大连接时长&ndash;&gt;-->
<!--        <property name="maxConnectionAge" value="10000"/>-->
<!--&lt;!&ndash;        失败重试次数&ndash;&gt;-->
<!--        <property name="acquireRetryAttempts" value="2"/>-->
    </bean>

<!--    SqlSessionFactory-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactory">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

<!--&lt;!&ndash;    SqlSession&ndash;&gt;-->
<!--    <bean class="org.mybatis.spring.SqlSessionTemplate" id="sqlSession">-->
<!--        <constructor-arg index="0" ref="sqlSessionFactory"/>-->
<!--    </bean>-->

<!--    配置dao接口扫描包，自动注入到spring容器，不用手动写Bean注入-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--        注入sqlSessioFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!--        要扫描包-->
        <property name="basePackage" value="com.lh.dao"/>
    </bean>
</beans>

整合Services层

创建spring-services.xml文件，用于绑定services层所有类，并为业务逻辑增添事务管理器

<?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:c="http://www.springframework.org/schema/c"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx
        https://www.springframework.org/schema/tx/spring-tx.xsd">


<!--    扫描services-->
    <context:component-scan base-package="com.lh.services"/>

<!--    注入services所有类-->
    <bean class="com.lh.services.impl.AdminServicesImpl" id="adminServices">
        <property name="adminMapper" ref="adminMapper"/>
    </bean>


<!--    服务层应该有事务管理-->
    <bean  class="org.springframework.jdbc.datasource.DataSourceTransactionManager"  id="transactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

<!--AOP织入事务管理器-->
    <tx:advice transaction-manager="transactionManager"  id="txTransactionManager">
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <aop:config>
        <aop:pointcut id="pointcut" expression="execution(* com.lh.services.*.*(..))"/>
        <aop:advisor advice-ref="txTransactionManager" pointcut-ref="pointcut"/>
    </aop:config>



</beans>

为maven项目增加web支持

整合springMVC

创建spring-mvc.xml,为其配置静态资源过滤器、注解驱动、视图解析器、包扫描

<?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:c="http://www.springframework.org/schema/c"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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/mvc
        https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--    包扫描-->
    <context:component-scan base-package="com.lh.controller"/>

    <!--    注解驱动,解决响应乱码-->
    <mvc:annotation-driven/>

    <!--    静态资源过滤器-->
    <mvc:default-servlet-handler/>


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

</beans>

在web.xml中，增加DispatcherServlet(将web项目交给spring管理，请求到达首先经过此servlet分发)、编码过滤器

<?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">
<!--    配置Dispatcherservlet-->
    <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>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>


<!--    乱码过滤器-->
    <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>
    
</web-app>

创建applicationContext.xml，关联spring-dao.xml,spring-services.xml,spring-mvc.xml文件，成为一个完整的ssm项目

<?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:c="http://www.springframework.org/schema/c"
       xmlns:p="http://www.springframework.org/schema/p"
       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="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-services.xml"/>
    <import resource="classpath:spring-mvc.xml"/>



    <!--    GSON注入-->
    <bean id="gson" class="com.google.gson.Gson"/>
    
<!--    文件上传下载-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="utf-8"/>
        <property name="maxUploadSize" value="102400000"/>
        <property name="maxInMemorySize" value="40960"/>
    </bean>

</beans>

一个完整的SSM项目应该有controller层、services层、dao层、pojo(实体类)、utils（工具包）这样的结构