一、环境准备

1.1、创建数据库和表

create database ssm;use ssm;create table t_account(id int primary key auto_increment,name varchar(30),age int,balance int
);insert into t_account values(default,'HelloWorld',23,100);

1.2、导入框架依赖的jar包

​ 由于我们整合的是SpringMVC、Spring和MyBatis，所以需要将这三个框架所需要的jar包导入到项目中。注意：由于要连接数据库，所以仍需要数据库驱动包。

​ 注意：MyBatis框架和Spring框架整合需要一个mybatis-spring的jar包，该jar包的作用是两个框架的转换包。

<dependencies><!--  MyBatis框架核心jar包  --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.3</version></dependency><!-- MySQL数据库驱动包 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.6</version></dependency><!-- 导入Spring的jar包--><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.2.1.RELEASE</version></dependency><!-- 添加对AOP的支持  --><dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.9.4</version></dependency><!-- 事务的jar包    --><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>5.2.1.RELEASE</version></dependency><!-- 操作数据库的支持	--><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.1.RELEASE</version></dependency><!--包含web应用开发时，用到spring框架时所需的核心类、文件上传以及工具类等--><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>5.2.1.RELEASE</version></dependency><!--与SpringMVC框架相关的jar包--><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.2.1.RELEASE</version></dependency><!--与json相关的jar包--><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.9.5</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-annotations</artifactId><version>2.9.5</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.5</version></dependency><!--原生的servlet的jar包--><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><!-- JSTL表达式 --><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><!--文件上传的jar包--><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.1</version></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.4</version></dependency><!--  log4j日志包  --><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency><!-- spring的测试包--><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>5.2.1.RELEASE</version><scope>test</scope></dependency><!--  单元测试框架  --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency><!-- MyBatis框架和Spring框架转换的转换包--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.0.3</version></dependency><!-- 阿里巴巴的数据源 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.21</version></dependency>
</dependencies>

1.3、修改Maven的编译版本

<properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target>
</properties>

1.4、完善Maven目录

1.5、编写项目需要的包

cn.bdqn.domain
cn.bdqn.mapper
cn.bdqn.service
cn.bdqn.controller
cn.bdqn.utils
cn.bdqn.exception

1.6、编写实体、Mapper、Service

public class Account {        private int id;           private String name;      private Integer age;      private Integer balance; // 生成get和set方法、toString方法
}

public interface AccountMapper {// 查询所有的账号public List<Account> selectAll();// 保存账号public void insert(Account account);
}

public interface AccountService {// 查询所有账号public List<Account> queryAll();// 保存账号public void save(Account account);
}

public class AccountServiceImpl implements AccountService {// 查询全部账号public List<Account> queryAll() {System.out.println("查询全部账号");return null;}// 保存账号public void save(Account account) {System.out.println("保存账号");}
}

二、配置MyBatis环境

2.1、配置mybatis的主配置文件

​ 主配置文件：mybaits-config.xml.

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<!-- mybatis的主配置文件 -->
<configuration><typeAliases><!-- 批量起别名  --><package name="cn.bdqn.domain"/></typeAliases><!-- 配置环境 --><environments default="mysql"><!-- 配置mysql的环境--><environment id="mysql"><!-- 配置事务的类型--><transactionManager type="JDBC"></transactionManager><!-- 配置数据源（连接池） --><dataSource type="POOLED"><!-- 配置连接数据库的4个基本信息 --><property name="driver" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql:///ssm?allowMultiQueries=true"/><property name="username" value="root"/><property name="password" value="1234567"/></dataSource></environment></environments><mappers><package name="cn.bdqn.mapper"/></mappers></configuration>

2.2、编写映射文件

​ 在resources目录下新建与mapper接口同名的目录。即：cn/bdqn/mapper

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.bdqn.mapper.AccountMapper"><!-- 查询全部账号信息--><select id="selectAll" resultType="cn.bdqn.domain.Account">selectid,name,age,balancefromt_account</select><!--  新增账号  --><insert id="insert">insert into t_account(name,age,balance) values (#{name},#{age},#{balance})</insert></mapper>

2.3、测试环境是否正确

    @Testpublic void testMyBatis() throws Exception{InputStream is = Resources.getResourceAsStream("mybatis-config.xml");SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(is);SqlSession session = ssf.openSession();AccountMapper accountMapper = session.getMapper(AccountMapper.class);List<Account> accounts = accountMapper.selectAll();System.out.println(accounts);is.close();session.close();}

三、配置Spring环境

3.1、编写主配置文件

​ 注意：由于是SSM项目整合，在Spring主配置文件中配置扫描包的时候仅仅针对Service业务层、Mapper持久化层等注解的扫描，对于Web层，交由SpringMVC框架去处理。

<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:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beanshttps://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttps://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/txhttps://www.springframework.org/schema/tx/spring-tx.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsd"><!-- 1、配置扫描包,排除Controller层的注解	--><context:component-scan base-package="cn.bdqn"><context:exclude-filter	type="annotation" 																			expression="org.springframework.stereotype.Controller"/></context:component-scan>
</beans>

3.2、测试Spring环境是否正确

    @Testpublic void testSpring() throws Exception{ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");AccountService accountService = (AccountService) ac.getBean("accountService");System.out.println(accountService);}

四、Spring整合MyBaits框架

​ 注意：我们在配置MyBaits环境的时候，数据源配置在了MyBatis上，现在由于Spring整合MyBaits，则对于在MyBatis中配置的数据源要交给Spring去管理。在这里，我们用的阿里巴巴的数据源。

​ 官网

4.1、定义数据库配置

​ 定义db.properties数据库配置文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///ssm?allowMultiQueries=true
jdbc.username=root
jdbc.password=1234567

4.2、主配置文件中引入properties配置文件

<context:property-placeholder location="classpath:db.properties"/>

4.3、注册数据源

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"><property name="driverClassName" value="${jdbc.driver}"/><property name="url" value="${jdbc.url}"/><property name="username" value="${jdbc.username}"/><property name="password" value="${jdbc.password}"/>
</bean>

4.4、定义事务管理器

<bean id="transactionManager" 																	  class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><property name="dataSource" ref="dataSource"/>
</bean>

4.5、开启事务的注解驱动支持

<tx:annotation-driven transaction-manager="transactionManager"/>

4.6、配置SqlSessionFactoryBean

<!--作用：创建SqlSessionFactory工厂-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource" />
</bean>

4.7、配置自动扫描所有 Mapper 接口和文件

<!-- 作用：能够扫描所有的Mapper接口的实现，让这些Mapper能够自动注入-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name="basePackage" value="cn.bdqn.mapper"/>
</bean>

4.8、测试

    @Testpublic void testSpringAndMyBatis() throws Exception{ApplicationContext ac =  new ClassPathXmlApplicationContext("beans.xml");AccountService accountService = (AccountService) ac.getBean("accountService");List<Account> accounts = accountService.queryAll();System.out.println(accounts);}

五、配置SpringMVC环境

5.1、主配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:mvc="http://www.springframework.org/schema/mvc"xmlns:context="http://www.springframework.org/schema/context"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mv="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/beanshttps://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/mvchttps://www.springframework.org/schema/mvc/spring-mvc.xsdhttp://www.springframework.org/schema/contexthttps://www.springframework.org/schema/context/spring-context.xsd"><!-- 配置扫描包  --><context:component-scan base-package="cn.bdqn" use-default-filters="false"><context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/></context:component-scan><!-- 配置视图解析器,作用是配置目录前缀和文件后缀，然后解析为一个资源文件 --><bean id="viewResolver"class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/jsp/"/><property name="suffix" value=".jsp"/></bean><mvc:annotation-driven/>
</beans>

5.2、web.xml配置前端控制器

<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"version="3.0"><servlet><servlet-name>frontDispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:SpringMVC.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>frontDispatcherServlet</servlet-name><url-pattern>/</url-pattern></servlet-mapping>
</web-app>

六、Spring集成SpringMVC环境

​ 在web.xml文件中配置。

<!--	配置 spring 提供的监听器，用于启动服务时加载容器 。	-->
<listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener><!-- 手动指定 spring 配置文件位置 -->
<context-param><param-name>contextConfigLocation</param-name><param-value>classpath:beans.xml</param-value>
</context-param>

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