用springboot+mybatis写一段代码：具体内容如下 1. 实现教师登录功能，登录成功显示学生列表页面，失败提示账号密码错误。（10不，分） 2. 完成学生表的查询功能，并实现学生分页查询功能。（10分） 3. 实现学生表修改编辑功能，要求点击修改默认显示学生信息，并且完成学号，姓名班级在提交前做非空校验。（10分） 4. 实现学生表修改保存功能，要求学号不可更改。（10分） 5. 利用Redis实现学生表查询缓存功能。（10分）

好的，以下是我的代码实现：

1. 实现教师登录功能：

Controller：

@RestController
@RequestMapping("/teacher")
public class TeacherController {
  
  @Autowired
  private TeacherService teacherService;
  
  @PostMapping("/login")
  public Result login(@RequestBody Teacher teacher, HttpServletRequest request) {
    boolean success = teacherService.login(teacher.getUsername(), teacher.getPassword());
    if (success) {
      HttpSession session = request.getSession();
      session.setAttribute("username", teacher.getUsername());
      return Result.success("登录成功");
    } else {
      return Result.error("账号密码错误");
    }
  }
  
  @GetMapping("/studentList")
  public Result studentList(HttpServletRequest request) {
    HttpSession session = request.getSession();
    String username = (String) session.getAttribute("username");
    if (username != null) {
      List<Student> studentList = studentService.getAllStudents();
      return Result.success(studentList);
    } else {
      return Result.error("请先登录");
    }
  }
  
}

Service：

@Service
public class TeacherService {
  
  @Autowired
  private TeacherMapper teacherMapper;
  
  public boolean login(String username, String password) {
    Teacher teacher = teacherMapper.findTeacherByUsername(username);
    if (teacher != null && teacher.getPassword().equals(password)) {
      return true;
    } else {
      return false;
    }
  }
  
}

Mapper：

@Mapper
public interface TeacherMapper {
  
  @Select("SELECT * FROM teacher WHERE username=#{username}")
  public Teacher findTeacherByUsername(String username);
  
}

2. 完成学生表的查询功能，并实现学生分页查询功能：

Controller：

@RestController
@RequestMapping("/student")
public class StudentController {
  
  @Autowired
  private StudentService studentService;
  
  @GetMapping("/list")
  public Result studentList(@RequestParam(defaultValue = "1") int pageNum, @RequestParam(defaultValue = "10") int pageSize) {
    PageHelper.startPage(pageNum, pageSize);
    List<Student> studentList = studentService.getAllStudents();
    PageInfo<Student> pageInfo = new PageInfo<>(studentList);
    return Result.success(pageInfo);
  }
  
  @GetMapping("/search")
  public Result searchStudents(@RequestParam String keyword, @RequestParam(defaultValue = "1") int pageNum, @RequestParam(defaultValue = "10") int pageSize) {
    PageHelper.startPage(pageNum, pageSize);
    List<Student> studentList = studentService.searchStudents(keyword);
    PageInfo<Student> pageInfo = new PageInfo<>(studentList);
    return Result.success(pageInfo);
  }
  
}

Service：

@Service
public class StudentService {
  
  @Autowired
  private StudentMapper studentMapper;
  
  public List<Student> getAllStudents() {
    return studentMapper.getAllStudents();
  }
  
  public List<Student> searchStudents(String keyword) {
    return studentMapper.searchStudents(keyword);
  }
  
}

Mapper：

@Mapper
public interface StudentMapper {
  
  @Select("SELECT * FROM student")
  public List<Student> getAllStudents();
  
  @Select("SELECT * FROM student WHERE student_id=#{keyword} OR name LIKE CONCAT('%',#{keyword},'%') OR class_name LIKE CONCAT('%',#{keyword},'%')")
  public List<Student> searchStudents(String keyword);
  
}

3. 实现学生表修改编辑功能：

Controller：

@RestController
@RequestMapping("/student")
public class StudentController {
  
  @Autowired
  private StudentService studentService;
  
  @GetMapping("/get")
  public Result getStudentById(@RequestParam int id) {
    Student student = studentService.getStudentById(id);
    return Result.success(student);
  }
  
  @PostMapping("/update")
  public Result updateStudent(@RequestBody Student student) {
    if (StringUtils.isEmpty(student.getStudentId()) || StringUtils.isEmpty(student.getName()) || StringUtils.isEmpty(student.getClassName())) {
      return Result.error("学号、姓名和班级不能为空");
    }
    studentService.updateStudent(student);
    return Result.success("修改成功");
  }
  
}

Service：

@Service
public class StudentService {
  
  @Autowired
  private StudentMapper studentMapper;
  
  public Student getStudentById(int id) {
    return studentMapper.getStudentById(id);
  }
  
  public void updateStudent(Student student) {
    studentMapper.updateStudent(student);
  }
  
}

Mapper：

@Mapper
public interface StudentMapper {
  
  @Select("SELECT * FROM student WHERE id=#{id}")
  public Student getStudentById(int id);
  
  @Update("UPDATE student SET name=#{name}, class_name=#{className} WHERE id=#{id}")
  public void updateStudent(Student student);
  
}

4. 实现学生表修改保存功能：

Controller：

@RestController
@RequestMapping("/student")
public class StudentController {
  
  @PostMapping("/update")
  public Result updateStudent(@RequestBody Student student) {
    if (StringUtils.isEmpty(student.getName()) || StringUtils.isEmpty(student.getClassName())) {
      return Result.error("姓名和班级不能为空");
    }
    studentService.updateStudent(student);
    return Result.success("修改成功");
  }
  
}

Service：

@Service
public class StudentService {
  
  @Autowired
  private StudentMapper studentMapper;
  
  public void updateStudent(Student student) {
    studentMapper.updateStudent(student);
  }
  
}

Mapper：

@Mapper
public interface StudentMapper {
  
  @Update("UPDATE student SET name=#{name}, class_name=#{className} WHERE id=#{id}")
  public void updateStudent(Student student);
  
}

5. 利用Redis实现学生表查询缓存功能：

Controller：

@RestController
@RequestMapping("/student")
public class StudentController {
  
  @Autowired
  private StudentService studentService;
  
  @GetMapping("/list")
  public Result studentList(@RequestParam(defaultValue = "1") int pageNum, @RequestParam(defaultValue = "10") int pageSize) {
    String cacheKey = "student_list_" + pageNum + "_" + pageSize;
    List<Student> studentList = (List<Student>) RedisUtils.get(cacheKey);
    if (studentList == null) {
      PageHelper.startPage(pageNum, pageSize);
      studentList = studentService.getAllStudents();
      PageInfo<Student> pageInfo = new PageInfo<>(studentList);
      RedisUtils.set(cacheKey, studentList, 60);
    }
    return Result.success(studentList);
  }
  
}

Service：

@Service
public class StudentService {
  
  @Autowired
  private StudentMapper studentMapper;
  
  public List<Student> getAllStudents() {
    return studentMapper.getAllStudents();
  }
  
}

以上是我的代码实现，可能还有一些细节需要根据具体情况进行调整。其中 Redis 缓存的实现需要使用第三方库，如 jedis 或者 lettuce。