fix bugs

exam-work-api/src/main/java/cn/com/qmth/examcloud/service/examwork/service/ExamStudentService.java

@@ -291,6 +291,9 @@ public class ExamStudentService {
 			if(!StringUtils.isEmpty(examCriteria.getExamSite())){
 				predicates.add(cb.like(root.get("examSite"),"%"+examCriteria.getExamSite()+"%"));
 			}
+			if(!StringUtils.isEmpty(examCriteria.getIdentityNumber())){
+				predicates.add(cb.equal(root.get("identityNumber"),examCriteria.getIdentityNumber()));
+			}
 		    return cb.and(predicates.toArray(new Predicate[predicates.size()]));
 		};
 		return specification;