StudentServiceImp implements StudentService { @Override public Student_Info selectStudentByNo(String no) { return studentInfoMapper.selectStudentByUserNo(no); }  @Override Student_Info selectStudentByNo(String no);  }
@Test public void selectStudentByNo() throws Exception { Student_Info student_info = studentServiceImp.selectStudentByNo("103"); System.out.println(student_info.getUser_name()); Assert.assertEquals("陆君", student_info.getUser_name()); }