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SSM框架探秘：Spring 整合 Mybatis 框架

article 2025/3/4 13:13:28

搭建和测试 MyBatis 的环境：

编写 AccountMapper.xml 映射配置文件：

<?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.qcby.mapper.AccountMapper">
    <select id="findAll" resultType="com.qcby.domain.Account">
        select * from account;
    </select>
</mapper>

在 web 项目中编写 SqlMapConfig.xml 的配置文件，编写核心配置文件

<?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>

    <!-- 配置环境 -->
    <environments default="mysql">
        <environment id="mysql">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql:///ssm"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>

    <!-- 加载映射配置文件 -->
    <mappers>
        <mapper resource="mapper/AccountMapper.xml"/>
    </mappers>

</configuration>

在 AccountMapper 接口中编写方法：

public interface AccountMapper {

    public List<Account> findAll();


}

编写测试方法(此时数据库还没有数据)：

@Test
public void run1() throws IOException {
    //加载配置文件
    InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");

    //创建工厂
    SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);

    //创建 session
    SqlSession session = factory.openSession();

    //获取代理对象
    AccountMapper accountMapper = session.getMapper(AccountMapper.class);

    List<Account> all = accountMapper.findAll();
    all.forEach(System.out::println);

    //关闭资源
    session.close();
    in.close();
}

Spring 整合 MyBatis 框架：

目的：

把 SqlMapConfig.xml 配置文件中的内容配置到 applicationContext.xml 配置文件中：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       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
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 开启注解扫描，要扫描的是service -->
    <context:component-scan base-package="com.qcby.service"/>

    <!-- 配置 druid 连接池 -->
    <!-- 配置开源连接池 Druid 连接池 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql:///ssm"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>

    <!-- Spring 框架整合 MyBatis 框架 -->
    <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入连接池对象 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 加载映射配置文件 -->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>

    <!-- 把 mapper 对象存入 IOC 容器中 -->
    <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactory" ref="sessionFactory"/>
        <property name="basePackage" value="com.qcby.mapper"/>
    </bean>

    <!-- 平台事务管理器 -->
    <bean id="transactionManger" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 配置事务的通知 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManger">
        <tx:attributes>
            <tx:method name="find*" read-only="true"/>
            <tx:method name="*"/>
        </tx:attributes>
    </tx:advice>

    <!-- 配置事务的增强 -->
    <aop:config>
        <aop:advisor advice-ref="txAdvice" pointcut="execution(public * com.qcby.service.Impl.*ServiceImpl.*(..))"/>
    </aop:config>

</beans>

在 AccountMapper 接口中添加 @Repository 注解：

在 service 中注入 mapper 对象，进行测试：

service 层代码：

@Service
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountMapper accountMapper;

    @Override
    public List<Account> findAll() {
        System.out.println("业务层逻辑:查询所有账号");
        List<Account> list = accountMapper.findAll();
        return list;
    }

    @Override
    public void save(Account account) {
        accountMapper.save(account);
    }
}

层代码：

@Controller
@RequestMapping("/account")
public class AccountController {

    @Autowired
    private AccountService accountService;

    /**
     * 查询所有方法
     */
    @RequestMapping("/findAll")
    public ModelAndView findAll(){
        System.out.println("表现层:查询所有账户");
        List<Account> list = accountService.findAll();

        for (Account a : list){
            System.out.println(a);
        }

        ModelAndView mv = new ModelAndView();
        mv.setViewName("suc");
        return mv;
    }
}

配置声明事务管理：

<!-- 平台事务管理器 -->
<bean id="transactionManger" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"/>
</bean>

<!-- 配置事务的通知 -->
<tx:advice id="txAdvice" transaction-manager="transactionManger">
    <tx:attributes>
        <tx:method name="find*" read-only="true"/>
        <tx:method name="*"/>
    </tx:attributes>
</tx:advice>

<!-- 配置事务的增强 -->
<aop:config>
    <aop:advisor advice-ref="txAdvice" pointcut="execution(public * com.qcby.service.Impl.*ServiceImpl.*(..))"/>
</aop:config>

表单代码：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
    <h2>Hello World!</h2>

    <a href="/account/findAll">查询所有</a>

    <h3>账号列表页面</h3>
    <a href="/account/findAll.do">查询所有</a>
    
    <h3>测试新增</h3>
    <form action="/account/save" method="post">
        姓名：<input type="text" name="name" /><br/>
        金额：<input type="text" name="money" /><br/>
        <input type="submit" value="保存" />
    </form>

</body>
</html>

controller 代码：

@Controller
@RequestMapping("/account")
public class AccountController {

    @Autowired
    private AccountService accountService;

    /**
     * 查询所有方法
     */
    @RequestMapping("/findAll")
    public ModelAndView findAll(){
        System.out.println("表现层:查询所有账户");
        List<Account> list = accountService.findAll();

        for (Account a : list){
            System.out.println(a);
        }

        ModelAndView mv = new ModelAndView();
        mv.setViewName("suc");
        return mv;
    }

    @RequestMapping("/save")
    public String save(Account account){
        //调用 Service 层保存数据
        accountService.save(account);

        return "suc";
    }
}

service 代码：

@Service
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountMapper accountMapper;

    @Override
    public List<Account> findAll() {
        System.out.println("业务层逻辑:查询所有账号");
        List<Account> list = accountMapper.findAll();
        return list;
    }

    @Override
    public void save(Account account) {
        accountMapper.save(account);
    }
}

mapper 代码：

@Repository
public interface AccountMapper {

    public List<Account> findAll();


    @Insert("insert into account (name,money) values (#{name},#{money})")
    void save(Account account);
}

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