fix: 新增学生导入模板接口及修复阅读任务日期筛选

- 新增 GET /api/v1/school/students/import/template 接口，返回导入模板配置
- 实现阅读任务 startDate/endDate 日期范围查询（按任务日期交集筛选）
- 支持阅读任务按 startDate/endDate 排序

Made-with: Cursor

reading-platform-java/src/main/java/com/reading/platform/controller/school/SchoolStudentController.java

@@ -13,6 +13,7 @@ import com.reading.platform.common.security.SecurityUtils;
 import com.reading.platform.dto.request.StudentCreateRequest;
 import com.reading.platform.dto.request.StudentUpdateRequest;
 import com.reading.platform.dto.request.TransferStudentRequest;
+import com.reading.platform.dto.response.StudentImportTemplateResponse;
 import com.reading.platform.dto.response.StudentResponse;
 import com.reading.platform.dto.response.StudentTransferHistoryItemResponse;
 import com.reading.platform.entity.Student;
@@ -24,6 +25,7 @@ import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.*;
 
+import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 
@@ -137,6 +139,22 @@ public class SchoolStudentController {
         return Result.success();
     }
 
+    @Operation(summary = "Get student import template")
+    @GetMapping("/import/template")
+    public Result<StudentImportTemplateResponse> getImportTemplate() {
+        return Result.success(new StudentImportTemplateResponse(
+                Arrays.asList("姓名", "性别", "出生日期", "班级ID", "家长姓名", "家长电话"),
+                Arrays.asList("张小明", "男", "2020-01-15", "1", "张三", "13800138000"),
+                Arrays.asList(
+                        "姓名为必填项",
+                        "性别可选：男/女，默认为男",
+                        "出生日期格式：YYYY-MM-DD",
+                        "班级ID为必填项，可在班级管理中查看",
+                        "家长姓名和家长电话为选填项"
+                )
+        ));
+    }
+
     @Operation(summary = "Get student class transfer history")
     @GetMapping("/{id}/history")
     public Result<List<StudentTransferHistoryItemResponse>> getStudentClassHistory(@PathVariable Long id) {

reading-platform-java/src/main/java/com/reading/platform/dto/response/StudentImportTemplateResponse.java

@@ -0,0 +1,27 @@
+package com.reading.platform.dto.response;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+/**
+ * 学生导入模板响应
+ */
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Schema(description = "学生导入模板")
+public class StudentImportTemplateResponse {
+
+    @Schema(description = "表头列表")
+    private List<String> headers;
+
+    @Schema(description = "示例行")
+    private List<String> example;
+
+    @Schema(description = "说明事项")
+    private List<String> notes;
+}

reading-platform-java/src/main/java/com/reading/platform/service/impl/TaskServiceImpl.java

@@ -712,19 +712,45 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task>
             wrapper.eq(Task::getStatus, status);
         }
 
-        // TODO: 实现更多筛选条件
-        // - classIds: 班级筛选（需要关联 task_target 表）
-        // - teacherIds: 教师筛选
-        // - dateType/startDate/endDate: 时间筛选
-        // - completionRate: 完成率筛选
-        // - sortBy/sortOrder: 排序
+        // 时间筛选：任务的 startDate~dueDate 与查询范围有交集的纳入结果
+        // 交集条件：task.startDate <= endDate AND task.dueDate >= startDate
+        if (StringUtils.hasText(startDate) && StringUtils.hasText(endDate)) {
+            try {
+                LocalDate rangeStart = LocalDate.parse(startDate);
+                LocalDate rangeEnd = LocalDate.parse(endDate);
+                // 任务开始日期 <= 查询结束日期（任务不能完全在查询范围之后）
+                wrapper.le(Task::getStartDate, rangeEnd);
+                // 任务截止日期 >= 查询开始日期（任务不能完全在查询范围之前）
+                wrapper.and(w -> w.ge(Task::getDueDate, rangeStart).or().isNull(Task::getDueDate));
+            } catch (Exception e) {
+                log.warn("解析日期参数失败 startDate={}, endDate={}", startDate, endDate, e);
+            }
+        } else if (StringUtils.hasText(startDate)) {
+            try {
+                LocalDate rangeStart = LocalDate.parse(startDate);
+                wrapper.ge(Task::getDueDate, rangeStart);
+            } catch (Exception e) {
+                log.warn("解析 startDate 参数失败: {}", startDate, e);
+            }
+        } else if (StringUtils.hasText(endDate)) {
+            try {
+                LocalDate rangeEnd = LocalDate.parse(endDate);
+                wrapper.le(Task::getStartDate, rangeEnd);
+            } catch (Exception e) {
+                log.warn("解析 endDate 参数失败: {}", endDate, e);
+            }
+        }
 
-        // 默认排序
-        if ("completionRate".equals(sortBy)) {
-            // 完成率排序需要特殊处理，暂时使用创建时间
-            wrapper.orderByDesc(Task::getCreatedAt);
+        // TODO: classIds、teacherIds、completionRate 筛选待实现
+
+        // 排序
+        boolean asc = "asc".equalsIgnoreCase(sortOrder);
+        if ("startDate".equals(sortBy)) {
+            wrapper.orderBy(true, asc, Task::getStartDate);
+        } else if ("endDate".equals(sortBy) || "dueDate".equals(sortBy)) {
+            wrapper.orderBy(true, asc, Task::getDueDate);
         } else {
-            wrapper.orderByDesc(Task::getCreatedAt);
+            wrapper.orderBy(true, asc, Task::getCreatedAt);
         }
 
         Page<Task> taskPage = taskMapper.selectPage(page, wrapper);