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面向对象学生系统/utils/validator.py

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+import json
+import os
+from typing import List, Optional
+from models.student import Student
+from dal.idal import IStudentDAL
+
+
+class JsonStudentDAL(IStudentDAL):
+    """JSON存储实现"""
+
+    def __init__(self, file_path: str = 'data/students.json'):
+        self.file_path = file_path
+        self._ensure_file_exists()
+
+    def _ensure_file_exists(self):
+        """确保JSON文件存在"""
+        os.makedirs(os.path.dirname(self.file_path), exist_ok=True)
+        if not os.path.exists(self.file_path):
+            with open(self.file_path, 'w', encoding='utf-8') as f:
+                json.dump([], f)
+
+    def _load_data(self) -> List[dict]:
+        """加载JSON数据"""
+        with open(self.file_path, 'r', encoding='utf-8') as f:
+            return json.load(f)
+
+    def _save_data(self, data: List[dict]):
+        """保存数据到JSON文件"""
+        with open(self.file_path, 'w', encoding='utf-8') as f:
+            json.dump(data, f, ensure_ascii=False, indent=2)
+
+    def add_student(self, student: Student) -> bool:
+        data = self._load_data()
+
+        # 检查学号和身份证号是否已存在
+        for item in data:
+            if item['id_card'] == student.id_card or item['stu_id'] == student.stu_id:
+                return False
+
+        data.append(student.to_dict())
+        self._save_data(data)
+        return True
+
+    def delete_student(self, id_card: str) -> bool:
+        data = self._load_data()
+        original_length = len(data)
+
+        data = [item for item in data if item['id_card'] != id_card]
+
+        if len(data) != original_length:
+            self._save_data(data)
+            return True
+        return False
+
+    def update_student(self, student: Student) -> bool:
+        data = self._load_data()
+        updated = False
+
+        for i, item in enumerate(data):
+            if item['id_card'] == student.id_card:
+                data[i] = student.to_dict()
+                updated = True
+                break
+
+        if updated:
+            self._save_data(data)
+        return updated
+
+    def get_by_id(self, id_card: str) -> Optional[Student]:
+        data = self._load_data()
+        for item in data:
+            if item['id_card'] == id_card:
+                return Student.from_dict(item)
+        return None
+
+    def get_by_stu_id(self, stu_id: str) -> Optional[Student]:
+        data = self._load_data()
+        for item in data:
+            if item['stu_id'] == stu_id:
+                return Student.from_dict(item)
+        return None
+
+    def get_all(self) -> List[Student]:
+        data = self._load_data()
+        return [Student.from_dict(item) for item in data]
+
+    def get_by_name(self, name: str) -> List[Student]:
+        data = self._load_data()
+        return [Student.from_dict(item) for item in data if name.lower() in item['name'].lower()]
+
+    def get_by_class(self, class_name: str) -> List[Student]:
+        data = self._load_data()
+        return [Student.from_dict(item) for item in data
+                if item['class_name'] and class_name.lower() in item['class_name'].lower()]
+
+    def get_by_major(self, major: str) -> List[Student]:
+        data = self._load_data()
+        return [Student.from_dict(item) for item in data
+                if item['major'] and major.lower() in item['major'].lower()]
+
+    def count_students(self) -> int:
+        data = self._load_data()
+        return len(data)
+
+    def count_by_major(self) -> dict:
+        data = self._load_data()
+        majors = {}
+
+        for item in data:
+            major = item.get('major', '未指定')
+            majors[major] = majors.get(major, 0) + 1
+
+        return majors
+
+    def clear_all(self) -> bool:
+        self._save_data([])
+        return True