多模块项目使用springboot框架进行业务处理-编程知识

项目目录

1、在Result定义返回结果

package com.edu.result;import lombok.Data;import java.io.Serializable;/*** 后端统一返回结果* @param <T>*/
@Data
public class Result<T> implements Serializable {private Integer code; //编码：1成功，0和其它数字为失败private String msg; //错误信息private T data; //数据public static <T> Result<T> success() {Result<T> result = new Result<T>();result.code = 1;return result;}public static <T> Result<T> success(T object) {Result<T> result = new Result<T>();result.data = object;result.code = 1;return result;}public static <T> Result<T> error(String msg) {Result result = new Result();result.msg = msg;result.code = 0;return result;}}

2、写实体类（entity,和表中的属性一一对应）

package com.edu.entity;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@AllArgsConstructor
@NoArgsConstructor
public class Class {private String classId;private int classSize;private String headTeacher;private int attendanceTimes;private int focus;
}

3、在（vo）中定义类，写自己想要返回的属性

package com.edu.vo;import io.swagger.models.auth.In;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@AllArgsConstructor
@NoArgsConstructor
public class AbsentStuVo {private String personName;private String studentId;private String classId;private Integer attendanceStatus;private String headTeacher;private String attendRate;
}

3、书写mapper层

package com.edu.mapper;import com.edu.vo.*;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;import java.util.List;@Mapper
public interface StudentMapper {/*** 根据学生id显示请假列表* @param studentId* @return*/@Select("select start_time, end_time, reason, leave_status, submit_time from leave_applications where student_id=#{studentId}")List<LeaveApplicationsVo> listLeaveApplications(String studentId);/*** 根据学生id显示迟到列表* @param studentId* @return*/@Select("select  l.late_date,c.course_session,c.course_name , l.teacher,l.entry_time,l.late_duration from late_attendance l left join course c on c.course_id=l.course_id where l.student_id=#{studentId}")List<LateAttendanceVo> listLateAttendance(String studentId);/***根据学生id显示旷课列表* @param studentId* @return*/@Select("select  a.absence_date,a.class_period,u.course_name,a.teacher from absence_record a left join course u on u.course_id=a.course_id where a.student_id=#{studentId}")List<AbsenceRecordVo> listAbsenceRecord(String studentId);/*** 请假列表详情* @param studentId* @return*/@Select("select l.student_id, s.student_name, l.start_time,l.end_time,l.reason,l.leave_status from leave_applications l left join student s on l.student_id=s.student_id where l.student_id=#{studentId}")List<LeaveApplicationsdetailVo> LeaveApplicationsdetail(String studentId);/*** 根据学生id查询该学生各科的缺勤次数* @param studentId* @return*/@Select("SELECT c.course_name, IFNULL(COUNT( DISTINCT a.absent_id), 0) AS absence_count FROM course c LEFT JOIN absent_students a ON c.course_id = a.course_id AND a.student_id = #{studentId} GROUP BY c.course_name")List<CourseAbsenceCountVo> viewAbsenceCountsForSubjects(String studentId);/*** 根据学生id查询学生信息* @param studentId* @return*/@Select("SELECT s.student_id, s.student_name, c.class_name, c.head_teacher," +" (pa.attendance_count /(pa.attendance_count + pa.leave_count+pa.absent_count)) * 100 AS attendance_rate  " +"FROM  student s JOIN  class c ON s.class_id = c.class_id  JOIN personal_attendance pa ON s.student_id = pa.student_id " +"WHERE s.student_id = #{studentId}")List<StudentDetailVO> viewStudentDetail(String studentId);/*** 申请请假* @param studentId 学生id* @param startTime 开始时间* @param endTime 结束时间* @param reason 原因* @return*/@Insert("INSERT INTO leave_applications (student_id, start_time, end_time, reason, submit_time)" +"VALUES (#{studentId}, #{startTime}, #{endTime}, #{reason}, NOW())")Integer insertLeaveRequest(String studentId, String startTime, String endTime, String reason);
}

4、编写service层

package com.edu.service;import com.edu.result.Result;
import com.edu.vo.*;import java.util.List;public interface StudentService {/*** 根据学生id显示请假列表* @param studentId* @return*/List<LeaveApplicationsVo> listLeaveApplications(String studentId);/*** 根据学生id显示迟到列表* @param studentId* @return*/List<LateAttendanceVo> listLateAttendance(String studentId);/*** 根据学生id显示旷课列表* @param studentId* @return*/List<AbsenceRecordVo> listAbsenceRecord(String studentId);/*** 请假列表详情* @param studentId* @return*/List<LeaveApplicationsdetailVo> LeaveApplicationsdetail(String studentId);/*** 根据学生id查询该学生各科的缺勤次数* @param studentId* @return*/List<CourseAbsenceCountVo> viewAbsenceCountsForSubjects(String studentId);/*** 根据学生id查询学生信息* @param studentId* @return*/List<StudentDetailVO> viewStudentDetail(String studentId);/*** 申请请假* @param studentId 学生id* @param startTime 开始时间* @param endTime 结束时间* @param reason 原因* @return*/Result insertLeaveRequest(String studentId, String startTime, String endTime, String reason);}

5、编写service层逻辑

package com.edu.service.Impl;import com.edu.mapper.StudentMapper;
import com.edu.result.Result;
import com.edu.service.StudentService;
import com.edu.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;@Service
@Slf4j
public class StudentServiceImpl implements StudentService {@Autowiredprivate StudentMapper studentMapper;/*** 根据学生id显示请假列表* @param studentId* @return*/@Overridepublic List<LeaveApplicationsVo> listLeaveApplications(String studentId){return studentMapper.listLeaveApplications(studentId);}/*** 根据学生id显示迟到列表* @param studentId* @return*/@Overridepublic  List<LateAttendanceVo> listLateAttendance(String studentId){return studentMapper.listLateAttendance(studentId);}/*** 根据学生id显示旷课列表* @param studentId* @return*/@Overridepublic  List<AbsenceRecordVo> listAbsenceRecord(String studentId){return studentMapper.listAbsenceRecord(studentId);}/*** 请假列表详情* @param studentId* @return*/@Overridepublic List<LeaveApplicationsdetailVo> LeaveApplicationsdetail(String studentId){return studentMapper.LeaveApplicationsdetail(studentId);}/*** 根据学生id查询该学生各科的缺勤次数* @param studentId* @return*/@Overridepublic List<CourseAbsenceCountVo> viewAbsenceCountsForSubjects(String studentId){return studentMapper.viewAbsenceCountsForSubjects(studentId);}/*** 根据学生id查询学生信息* @param studentId* @return*/@Overridepublic  List<StudentDetailVO> viewStudentDetail(String studentId){return studentMapper.viewStudentDetail(studentId);}/*** 申请请假* @param studentId 学生id* @param startTime 开始时间* @param endTime 结束时间* @param reason 原因* @return*/@Overridepublic Result insertLeaveRequest(String studentId, String startTime, String endTime, String reason){try {int deletedCount = studentMapper.insertLeaveRequest(studentId,startTime,endTime,reason);if (deletedCount == 0) {return Result.error("插入失败");} else {return Result.success("插入成功");}} catch (Exception e) {// 记录异常或进行其他处理return Result.error("插入时发生错误：" + e.getMessage());}}}

6、编写控制层（controller）

package com.edu.controller;import com.edu.result.Result;
import com.edu.service.StudentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;@RestController
@RequestMapping("/attendance/student")
@Slf4j
public class StudentController {@Autowiredprivate StudentService studentService;/*** 根据学生id显示请假列表* @param studentId* @return*/@GetMapping("/listLeaveApplications")public Result listLeaveApplications(String studentId)  {return Result.success(studentService.listLeaveApplications(studentId));}/*** 根据学生id显示迟到列表* @param studentId* @return*/@GetMapping("/listLateAttendance")public Result listLateAttendance(String studentId)  {return Result.success(studentService.listLateAttendance(studentId));}/*** 根据学生id显示旷课列表* @param studentId* @return*/@GetMapping("/listAbsenceRecord")public Result listAbsenceRecord(String studentId)  {return Result.success(studentService.listAbsenceRecord(studentId));}/*** 请假列表详情* @param studentId* @return*/@GetMapping("/viewLeaveApplications")public Result LeaveApplicationsdetail(String studentId)  {return Result.success(studentService.LeaveApplicationsdetail(studentId));}/*** 根据学生id查询该学生各科的缺勤次数* @param studentId* @return*/@GetMapping("/viewAbsenceCountsForSubjects")public Result viewAbsenceCountsForSubjects(String studentId)  {return Result.success(studentService.viewAbsenceCountsForSubjects(studentId));}/*** 根据学生id查询学生信息* @param studentId* @return*/@GetMapping("/viewStudentDetail")public Result viewStudentDetail(String studentId)  {return Result.success(studentService.viewStudentDetail(studentId));}/*** 申请请假* @param studentId 学生id* @param startTime 开始时间* @param endTime 结束时间* @param reason 原因* @return*/@PostMapping("/insertLeaveRequest")public Result insertLeaveRequest(String studentId, String startTime, String endTime, String reason)  {return Result.success(studentService.insertLeaveRequest(studentId,startTime,endTime,reason));}}