fix: 修复计算学期学年的 start bug

src/main/java/cn/teammodel/utils/SchoolDateUtil.java

@@ -54,23 +54,42 @@ public class SchoolDateUtil {
 
         // 将 semester 根据大小排序
         semesters.sort(Comparator.comparing(s -> LocalDate.of(date.getYear(), s.getMonth(), s.getDay())));
+        School.Semester start = semesters.stream().filter(s -> s.getStart() == 1).findFirst().orElseThrow(() -> new ServiceException("学期异常, 未找到新学年开学日期"));
+        LocalDate startDate = LocalDate.of(date.getYear(), start.getMonth(), start.getDay());
 
         // i = 0 的日期是开学最早, i = size - 1 是开学最晚
         int size = semesters.size();
         // 拿到最晚开学的日期,将年份 - 1后,与头节点组成可跨年区间
         School.Semester lastSemester = semesters.get(size - 1);
         School.Semester firstSemester = semesters.get(0);
+        LocalDate firstSemesterDate = LocalDate.of(date.getYear(), firstSemester.getMonth(), firstSemester.getDay());
+
         // 动态替换
         LocalDate lastSemesterStart = LocalDate.of(date.getYear() - 1, lastSemester.getMonth(), lastSemester.getDay());
         String lastSemesterId = lastSemester.getId();
+
         for (School.Semester semester : semesters) {
             // 特判头尾的提起,分别将学期区间提前和延后一年(不用延后),例如 2023.3.1 与 2023.9.1 我们分别向添加一个节点,划分其为 3 个区间:
             // 2022.9.1 - 2023.3.1, 2023.3.1 - 2023.9.1, 2023.9.1 - 2024.3.1
             LocalDate curSemesterStart = LocalDate.of(date.getYear(), semester.getMonth(), semester.getDay());
-            if (date.isEqual(lastSemesterStart) || date.isAfter(lastSemesterStart) && date.isBefore(curSemesterStart)) {
+
+            // 跨年的情况
+            if(date.isBefore(firstSemesterDate)) {
+                // 这里是去年的最后一个开学日期(last 还未开始迭代)
                 String academicYearId = generateCurAcademicId(lastSemesterStart.getYear(), lastSemesterId);
                 return new semesterModel(academicYearId, lastSemesterId, lastSemesterStart.atStartOfDay(), semester.getId(), curSemesterStart.atStartOfDay());
             }
+
+            if (date.isEqual(lastSemesterStart) || date.isAfter(lastSemesterStart) && date.isBefore(curSemesterStart)) {
+                // 如果当前时间在开学时期之前, 学年则是去年
+                if (date.isBefore(startDate)) {
+                    String academicYearId = generateCurAcademicId(date.getYear() - 1, lastSemesterId);
+                    return new semesterModel(academicYearId, lastSemesterId, lastSemesterStart.atStartOfDay(), semester.getId(), curSemesterStart.atStartOfDay());
+                }
+                String academicYearId = generateCurAcademicId(date.getYear(), lastSemesterId);
+                return new semesterModel(academicYearId, lastSemesterId, lastSemesterStart.atStartOfDay(), semester.getId(), curSemesterStart.atStartOfDay());
+            }
+            // 迭代
             lastSemesterStart = curSemesterStart;
             lastSemesterId = semester.getId();
         }

src/test/java/cn/teammodel/TestWithoutSpring.java

@@ -144,16 +144,16 @@ public class TestWithoutSpring {
     @Test
     public void testLocalDateTime() {
         List<School.Semester> semesters = Arrays.asList(
-                new School.Semester("1", "上学期", 0, 2, 1), // 2024-3   , 正确: 2023-3
-                new School.Semester("3", "下学期", 1, 8, 1)
-//                new School.Semester("4", "下学期", 0, 11, 1),
-//                new School.Semester("2", "下学期", 0, 5, 1)
+                new School.Semester("1", "下学期", 1, 2, 1), // 2024-3   , 正确: 2023-3
+//                new School.Semester("2", "下学期", 0, 5, 1),
+                new School.Semester("3", "上学期", 0, 8, 1)
+//                new School.Semester("4", "下学期", 0, 11, 1)
         );
 
-//        LocalDate currentDate = LocalDate.of(2024, 11, 1);
+        LocalDate currentDate = LocalDate.of(2024, 1, 1);
 
-        String id = SchoolDateUtil.calculateAcademicYearId(semesters, LocalDate.now());
-        System.out.println(id);
+//        String id = SchoolDateUtil.calculateAcademicYearId(semesters, currentDate);
+        System.out.println(SchoolDateUtil.getSemesterByNow(semesters, currentDate));
     }
 
     @Test