1.编写实体类

略

2. 写mapper映射文件

通过名字查询 通过ID主键查询… 略

写dao

CRUD相关抽象方法
List getAll();
Student getOneBySid(int sid);
int deleteOne(int sid);
int deleteSome(int[] sidArrInt);
int addOne(Student student);
int updateOne(Student student);

写业务层service(和dao差不多)

Teacher Login(String tname,String tpwd);

写实现类

public Teacher Login(String tname,String tpwd) {
//通过byname方法获取一个老师对象 然后通过数据库数据对比 账号密码是否一致
Teacher teacher = teacherDao.getOneByTname(tname);
if (teacher==null){
//自定义异常
throw new TeacherLoginException("账号不存在");
}
if (!teacher.getTpwd().equals(tpwd)){
throw new TeacherLoginException("密码错误");
}
return teacher;
}

填写action层

restful风格的CRUD
@Autowired
private TeacherService service;
@RequestMapping(value = "/teacher/getYzmImg.action",method = RequestMethod.GET)
public void getYzmImgMethod(HttpServletRequest req, HttpServletResponse resp){
try {
CheckImage.getYzm(resp,req);
} catch (Exception e) {
throw new TeacherLoginException("图片验证码错误");
}
}
@RequestMapping(value = "/teacher/login.action",method = RequestMethod.GET)
public ResponseVo LoginMethod(HttpServletRequest req,String tname,String tpwd,String tyzm){

    String yzmSession = (String) req.getSession().getAttribute("yzmSession");  
    if (!tyzm.equals(yzmSession)){  
        throw new TeacherLoginException("验证码错误！");  
    }  
    Teacher teacher = service.Login(tname, tpwd);  
    req.getSession().setAttribute("teacher",teacher);

    return new ResponseVo<>(200, "登陆成功", teacher);  
}