mybatis 除了可以單獨使用`XXMapper.xml`完成數據庫操作外，還可以與組件`SqlSessionTemplate`配合來用，這樣我們也可以給 DAO 創建一個實現類。 <br/> 步驟如下： **1. 實現dao層接口** ```java @Data public class StudentDaoImpl implements StudentDao { private SqlSessionTemplate sqlSessionTemplate; @Override public Student findById(int id) { return sqlSessionTemplate.selectOne("com.learn.spring07.dao.StudentDao.findById", id); } } ``` **2. 在 `resources/ApplicationContext.xml` 配置SqlSessionTemplate** ```xml <!-- 配置SqlSessionTemplate --> <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory" /> </bean> <!-- 注入dao層實現類 --> <bean id="studentDaoImpl" class="com.learn.spring07.dao.impl.StudentDaoImpl"> <property name="sqlSessionTemplate" ref="sqlSessionTemplate" /> </bean> ``` **3. 測試** ```java @Test public void findById02() { ApplicationContext context = new ClassPathXmlApplicationContext("ApplicationContext.xml"); StudentService studentService = context.getBean(StudentService.class); Student student = studentService.findById(1); System.out.println(student); //Student(id=1, name=張三, age=25, gender=男生) } ```