MyBatis-Spring整合之方式3

Posted 2021-03-09 方寸间

通过注解整合

1.在UserDao同级目录下新建接口UserMapper，内容如下：

public interface UserMapper {
    @Select("select * from user")
    public List<User> selectUser();
}

2.新建service包，改写UserDao和其实现类为UserService类和其实现类，如下：

public interface UserService {
    public List<User> selectUser();
}



public class UserServiceImp implements UserService {
    private UserMapper userMapper;
    @Override
    public List<User> selectUser() {
        return userMapper.selectUser();
    }

    public void setUserMapper(UserMapper userMapper) {
        this.userMapper = userMapper;
    }
}

3.beans.xml新增bean标签、修改原UserDao标签，如下:

<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
    <property name="mapperInterface" value="com.lxy.dao.UserMapper"/>
    <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
</bean>
<bean id="userService" class="com.lxy.service.imp.UserServiceImp">
    <property name="userMapper" ref="userMapper"/>
</bean>

4.修改test为新的类型，如下：

public class test {
    public static void main(String[] args) throws IOException {
        ApplicationContext context=new ClassPathXmlApplicationContext("Beans.xml");
        UserService userService= (UserService) context.getBean("userService");
        System.out.println(userService.selectUser().size());
    }
}