增加查询某次考生考生数量的API

stmms-web/src/main/java/cn/com/qmth/stmms/api/controller/ExamStudentController.java

@@ -180,6 +180,23 @@ public class ExamStudentController {
         return array;
     }
 
+    @AuthValidate("adminUser")
+    @RequestMapping("/students/count/{examId}")
+    @ResponseBody
+    public long getStudentCount(HttpServletRequest request, @PathVariable Integer examId,
+            @RequestParam(required = false) Boolean upload, @RequestParam(required = false) Boolean absent) {
+        User user = RequestUtils.getApiUser(request);
+        Exam exam = examService.findById(examId);
+        if (exam != null && exam.getSchoolId().equals(user.getSchoolId())) {
+            ExamStudentSearchQuery query = new ExamStudentSearchQuery();
+            query.setExamId(examId);
+            query.setUpload(upload);
+            query.setAbsent(absent);
+            return examStudentService.countByQuery(query);
+        }
+        return 0;
+    }
+
     @AuthValidate("adminUser")
     @RequestMapping(value = "/exam/students")
     @ResponseBody