feat: 新增学生信息表的导入和导出功能

RollCallServer/src/main/java/cc/aspark/controller/StudentController.java

@@ -57,6 +57,18 @@ public class StudentController {
         return Result.success();
     }
 
+    @Operation(summary = "通过文件导入学生信息")
+    @PostMapping("/import")
+    public Result saveBatch(MultipartFile file) {
+        studentService.importStudentsByExcel(file);
+        return Result.success();
+    }
+
+    @Operation(summary = "导出学生信息")
+    @GetMapping("/export")
+    public void exportStudents(HttpServletResponse response) {
+        studentService.exportStudentsToExcel(response);
+    }
 
     @Operation(summary = "更新学生信息")
     @PutMapping
@@ -73,5 +85,4 @@ public class StudentController {
     }
 
 
-
 }

RollCallServer/src/main/java/cc/aspark/service/StudentService.java

@@ -21,4 +21,8 @@ public interface StudentService extends IService<Student> {
 
     void save(StudentDTO studentDTO);
 
+    void importStudentsByExcel(MultipartFile file);
+
+    void exportStudentsToExcel(HttpServletResponse response);
+
 }

RollCallServer/src/main/java/cc/aspark/service/impl/StudentServiceImpl.java

@@ -128,4 +128,108 @@ public class StudentServiceImpl extends ServiceImpl<StudentMapper, Student>
     }
 
 
+    @Override
+    public void importStudentsByExcel(MultipartFile file) {
+        try {
+            ExcelReader reader = ExcelUtil.getReader(file.getInputStream());
+            reader  .addHeaderAlias("学号", "no")
+                    .addHeaderAlias("姓名", "name")
+                    .addHeaderAlias("性别", "gender")
+                    .addHeaderAlias("班级", "className")
+                    .addHeaderAlias("积分", "credits")
+                    .addHeaderAlias("创建时间", "createTime")
+                    .addHeaderAlias("最后操作时间", "updateTime");
+            List<Map<String, Object>> rows = reader.readAll();
+            LocalDateTime now = LocalDateTime.now();
+            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+            List<Student> studentList = rows.stream().map(row -> {
+                Student student = new Student();
+                student.setNo(row.get("no").toString());
+                student.setName(row.get("name").toString());
+                student.setGender("男".equals(row.get("gender")) ? (short) 0 : (short) 1);
+                student.setClassName(row.get("className").toString());
+                student.setCreator(Integer.valueOf(BaseContext.getCurrentId().toString()));
+                if (row.get("credits") == null) {
+                    student.setPoints(0.00);
+                } else {
+                    student.setPoints(Double.valueOf(row.get("credits").toString()));
+                }
+
+                if (row.get("createTime") == null) {
+                    student.setCreateTime(now);
+                } else {
+                    String createTimeStr = row.get("createTime").toString();
+                    student.setCreateTime(LocalDateTime.parse(createTimeStr, formatter));
+                }
+
+                if (row.get("updateTime") == null) {
+                    student.setUpdateTime(now);
+                } else {
+                    String updateTimeStr = row.get("updateTime").toString();
+                    student.setUpdateTime(LocalDateTime.parse(updateTimeStr, formatter));
+                }
+                return student;
+            }).toList();
+            try {
+                baseMapper.insertOrUpdate(studentList);
+            } catch (Exception e) {
+                log.info(e.getMessage());
+            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public void exportStudentsToExcel(HttpServletResponse response) {
+        try {
+            LambdaQueryWrapper<Student> wrapper = new LambdaQueryWrapper<>();
+            wrapper.eq(Student::getCreator, BaseContext.getCurrentId());
+            List<Student> studentList = baseMapper.selectList(wrapper);
+
+            // 创建一个Excel写入器
+            ExcelWriter writer = ExcelUtil.getWriter(true);
+
+            // 设置表头别名
+            writer.addHeaderAlias("no", "学号");
+            writer.addHeaderAlias("name", "姓名");
+            writer.addHeaderAlias("gender", "性别");
+            writer.addHeaderAlias("className", "班级");
+            writer.addHeaderAlias("points", "积分");
+            writer.addHeaderAlias("createTime", "创建时间");
+            writer.addHeaderAlias("updateTime", "最后操作时间");
+
+            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+            // 将性别的数字转换为文字
+            List<Map<String, Object>> rows = studentList.stream().map(student -> {
+                Map<String, Object> row = new HashMap<>();
+                row.put("no", student.getNo());
+                row.put("name", student.getName());
+                row.put("gender", student.getGender() == 0 ? "男" : "女");
+                row.put("className", student.getClassName());
+                row.put("points", student.getPoints());
+                row.put("createTime", student.getCreateTime().format(formatter));
+                row.put("updateTime", student.getUpdateTime().format(formatter));
+                return row;
+            }).collect(Collectors.toList());
+
+            // 写入数据
+            writer.write(rows, true);
+
+            // 设置响应头
+            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
+            response.setHeader("Content-Disposition", "attachment;filename=students.xlsx");
+
+            // 输出Excel文件
+            ServletOutputStream out = response.getOutputStream();
+            writer.flush(out, true);
+            writer.close();
+            IoUtil.close(out);
+
+        } catch (Exception e) {
+            log.error("导出Excel失败", e);
+            throw new BaseException(e.getMessage());
+        }
+    }
+
 }