String config="mybatis.xml";
InputStream in=Resources.getResourceAsStream(config);
SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder();
SqlSessionFactory factory=builder.build(in);
SqlSession sqlSession=factory.openSession();
?
String Id="com.bj.dao.StudentDao.selectStudents"
List<Student>students=sqlSession.selectList();
for(Student student:students){
    sout(student);
}

String config="mybatis.xml";
InputStream in=Resource.getResourceAsStrean(config);
SqlSessionFactroyBuild sqlSessionFactroyBuild=new SqlSessionFactoryBuild();
SqlSessionFactory sqlSessionFactory=sqlSessionFactoryBuild.build(in);
SqlSession sqlSession=sqlSessionFactory.open();
?
?
StudentDao studentDao=sqlSession.getMapper(StudentDao.class);
List<Student>students=studentDao.selectStudent();
for(Student student:students){
    sout(student);
}

 1 我來說一下樓主實驗出來的機制：
 2     我學的是某b站教程，他叫我們吧映射文件和dao接口放一起，我不明白其中機制。
 3      于是有了如下發(fā)現(xiàn)。
 4      
 5 
 6     主配置文件中
 7 
 8 <mappers>
 9 <mapper resource>
10 </mappers>
11 
12 
13 
14 <mapper namespace="如果你">
15     <
16     
17 </mapper>