fix bug

stmms-web/src/main/java/cn/com/qmth/stmms/admin/exam/CheckStudentController.java

@@ -62,19 +62,23 @@ public class CheckStudentController extends BaseExamController {
         for (CheckStudent c : list) {
             studentIds.add(c.getStudentId());
         }
-        ExamStudentSearchQuery sQuery = new ExamStudentSearchQuery();
-        sQuery.setExamId(examId);
-        sQuery.setPageNumber(query.getPageNumber());
-        sQuery.setPageSize(query.getPageSize());
-        sQuery.setSubjectCode(query.getSubjectCode());
-        sQuery.setExamSite(query.getExamSite());
-        sQuery.setStudentIds(studentIds);
-        List<ExamStudent> studentList = studentService.findByQuery(sQuery).getResult();
+        if (!list.isEmpty()) {
+            ExamStudentSearchQuery sQuery = new ExamStudentSearchQuery();
+            sQuery.setExamId(examId);
+            sQuery.setPageNumber(query.getPageNumber());
+            sQuery.setPageSize(query.getPageSize());
+            sQuery.setSubjectCode(query.getSubjectCode());
+            sQuery.setExamSite(query.getExamSite());
+            sQuery.setStudentIds(studentIds);
+            List<ExamStudent> studentList = studentService.findByQuery(sQuery).getResult();
+            query.setTotalCount(sQuery.getTotalCount());
+            query.setTotalPage(sQuery.getTotalPage());
+            model.addAttribute("studentList", studentList);
+        } else {
+            model.addAttribute("studentList", new ArrayList<ExamStudent>());
+        }
         model.addAttribute("typeList", CheckType.values());
-        model.addAttribute("studentList", studentList);
         model.addAttribute("subjectList", getCheckSubject(examId, wu));
-        query.setTotalCount(sQuery.getTotalCount());
-        query.setTotalPage(sQuery.getTotalPage());
         model.addAttribute("query", query);
         return "modules/exam/checkStudent";
     }
@@ -109,7 +113,7 @@ public class CheckStudentController extends BaseExamController {
         for (CheckStudent c : list) {
             studentIds.add(c.getStudentId());
         }
-        if (StringUtils.isNotBlank(examSite)) {
+        if (StringUtils.isNotBlank(examSite) && !studentIds.isEmpty()) {
             ExamStudentSearchQuery sQuery = new ExamStudentSearchQuery();
             sQuery.setExamId(examId);
             sQuery.setPageSize(Integer.MAX_VALUE);