【SSM整合】Spring+SpringMVC+Mybatis框架整合

将三大框架整合在一起的方法

一、前期准备

• 导包（Maven设置）

<?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>SpringMVC框架</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>整合ssm</artifactId>
	
    <!--导入依赖-->
    <dependencies>
        <!--Junit：单元测试-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <!--mysql8数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.22</version>
        </dependency>

        <!--数据库连接池(c3p0, dbcp)-->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

        <!--Servlet jsp-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!--Mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

        <!--Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
    </dependencies>

    <!--静态资源导出-->
    <build>
        <resources>
            <!--maven资源打包，java目录下默认值打包java程序，不打包配置文件，通过设置也让其打包-->
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>
    
</project>

二、整合Mybatis层

2.1 数据库创建

create database `ssmbuild`;

use `ssmbuild`;

create table `book`(
	`bookID` int(10) not null auto_increment,
	`bookName` varchar(100) not null,
	`bookCounts` int(11) not null,
	`detail` varchar(200) not null,
	key `bookID` (`bookID`)
)engine=innodb default charset=utf8

insert into `book` (`bookID`, `bookName`, `bookCounts`, `detail`)
values (1, 'java', 1, '从入门到放弃'),
	   (2, 'MySQL', 10, '从删库到跑路'),
	   (3, 'Linux', 5, '从进门到进牢')

2.2 创建相应的包

• controller、dao(mapper)、pojo(bean)、service

2.3 创建数据库对应的bean/pojo

• 为了偷懒，可以导入一个第三方jar包lombok

Maven依赖导入
        <!--lombok：通过注解，快速创建Bean对象-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>

Bean/Pojo
@Data //自动产生get set toString方法
@AllArgsConstructor //创建所有有参构造器
@NoArgsConstructor //创建无参构造器
public class Books {
    private Integer bookID;
    private String bookName;
    private Integer bookCounts;
    private String detail;
}

2.3 创建接口

• 在dao包中创建映射接口

public interface BookMapper {
    //增
    int addBook(Book book);
    
    //删
    int deleteBookById(Integer id);

    //改
    int updateBook(Book book);
    
    //查
    Book queryBookById(Integer id);
    List<Books> queryAllBook();
}

2.4 创建接口的Mybatis的映射文件

• 在dao包中创建和接口同名的映射文件
• 在映射文件中添加方法执行的sql语句

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.letere.dao.BookMapper">
    <insert id="addBook" parameterType="com.letere.pojo.Books">
        insert into book(bookName, bookCounts, detail)
        values (#{bookName}, #{bookCounts}, #{detail})
    </insert>

    <delete id="deleteBookById" parameterType="Integer">
        delete from book
        where bookID=#{bookID}
    </delete>

    <update id="updateBook" parameterType="com.letere.pojo.Books"> <!--Books在全局配置文件起了别名-->
        update book
        set bookName=#{bookName}, bookCounts=#{bookCounts}, detail=#{detail}
        where bookID=#{bookID}
    </update>

    <select id="queryBookById" parameterType="Integer" resultType="com.letere.pojo.Books">
        select *
        from book
        where bookID=#{bookID}
    </select>

    <select id="queryAllBook" resultType="com.letere.pojo.Books">
        select *
        from book
    </select>
</mapper>

2.5 创建Mybatis全局映射文件

• 在全局配置文件中注册Mapper映射文件

<?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>
    
    <!--配置数据源：读取配置文件（交给Spring去做）-->
    
    <!--起别名-->
    <typeAliases>
        <package name="com.letere.pojo"/>
    </typeAliases>

    <!--将写好的sql映射文件注册到全局配置文件中-->
    <mappers>
<!--        <mapper resource=".\\com\\letere\\dao\\BookMapper.xml" />-->
        <mapper class="com.letere.dao.BookMapper" /> <!--接口 和 映射文件 名称一样，可以直接用class来定位-->
    </mappers>

</configuration>

2.6 创建Service层的实现类

• 在Service包创建BookMapper的实现类，用于Controller层调用

@Service
public class BookService implements BookMapper{

    @Autowired
    private BookMapper bookMapper;//创建BookMapper对象，来调用其接口


    @Override
    public int addBook(Book book) {
        return bookMapper.addBook(book);
    }

    @Override
    public int deleteBookById(Integer id) {
        return bookMapper.deleteBookById(id);
    }

    @Override
    public int updateBook(Book book) {
        return bookMapper.updateBook(book);
    }

    @Override
    public Book queryBookById(Integer id) {
        return bookMapper.queryBookById(id);
    }

    @Override
    public List<Books> queryAllBook() {
        return bookMapper.queryAllBook();
    }
}

2.7 创建好数据库连接配置文件

• 在resources文件下创建一个database.properties

  mysql.dirver=com.mysql.cj.jdbc.Driver
  mysql.url=jdbc:mysql://localhost:3306/ssmbuild?serverTimezone=GMT%2B8&useSSL=true&useUnicode=true&characterEncoding=utf8
  mysql.username=root
  mysql.password=123

2.8 创建配置整合文件

• 将mybatis+spring+springmvc三个框架都整合在一个文件中

<?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">

    <!--将其他配置文件进行关联-->

</beans>

---

三、整合Spring层

3.1 关于DAO层的Spring配置文件

• 创建一个spring-dao.xml的配置文件，里面填写配置内容

<?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: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://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring.xsd">

    <!--1.关联数据库配置文件-->
    <context:property-placeholder location="classpath:database.properties"/>

    <!--2.数据源
        dbcp：半自动化，不能自动连接
        c3p0：自动化操作（自动化加载配置文件，并可以自动设置到对象中）
        druid：hikari
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${mysql.driver}"/>
        <property name="jdbcUrl" value="${mysql.url}" />
        <property name="user" value="${mysql.username}" />
        <property name="password" value="${mysql.password}" />

        <!--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.sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--绑定数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!--绑定Mybatis的全局配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!--4.配置dao接口扫描包，动态的实现类Dao接口可以注入到Spring容器中-->
    <mybatis-spring:scan base-package="com.letere.dao"/>
    <!-- 旧方法 -->
<!--    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">-->
<!--        <property name="basePackage" value="com.letere.dao"/>-->
<!--    </bean>-->
</beans>

3.2 关于Service层的Spring配置文件

• 创建一个Spring-service.xml 文件，里面填写配置信息

<?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.扫描serviec层下的包-->
    <context:component-scan base-package="com.letere.service"/>

    <!--2.声明事务配置-->
    <bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager" id="dataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--3.aop事务支持-->

</beans>

3.3 在关联Spring文件导入dao和service的配置文件

• 在applicationContext.xml中导入spring-dao.xml 和 spring-service.xml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">

    <!--将其他配置文件进行关联-->
    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
</beans>

---

四、整合SpringMVC层

4.1 添加web支持

• 右键模块 –> Add FrameWork Support –> JavaSE –> Web Application –> 勾选后选择4.0版本

• 防止项目发布出现缺少依赖，要手动将依赖引入到发布项目中

4.2 创建springmvc的配置文件

• 创建spring-mvc.xml配置文件，里面填写配置信息

<?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">

    <!--扫描contorller包-->
    <context:component-scan base-package="com.letere.controller"/>

    <!--注解驱动-->
    <mvc:annotation-driven/>

    <!--静态资源过滤-->
    <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>

4.3 将SpringMVC配置导入到Spring关联文件

• 将spring-mvc.xml导入到applicationContext.xml中

<?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">
    <!--Spring核心配置文件-->

    <!--将其他配置文件进行关联-->
    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml"/>
</beans>

4.4 配置Web.xml文件

<?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">

    <!--SpringMVC自带servlet-->
    <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><!--框架整合中，不仅需要springmvc的配置文件，还需要其他的，所以直接用整合的配置文件-->
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--过滤器，解决乱码-->
    <filter>
        <filter-name>encoding</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name><!--private String encoding;因为可以为空，所以代码不提示-->
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--Session超时时间-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

• 以上是框架整合最基本的的内容了
• 后面就是Controller 和 JSP页面之间的使用，在SpringMVC中有所讲解，就不展开了