SSM登录操作

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<Student> 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<Teacher> 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);
    }