fix cache keys timeout.

examcloud-core-oe-student-service/src/main/java/cn/com/qmth/examcloud/core/oe/student/service/impl/ExamControlServiceImpl.java

@@ -1913,7 +1913,7 @@ public class ExamControlServiceImpl implements ExamControlService {
         }
 
         examingHeartbeat.setCost(calcUsedExamSeconds(studentId));
-        redisClient.set(examingHeartbeatKey, examingHeartbeat,OeConstants.TIME_OUT_7_DAY);//更新心跳缓存
+        redisClient.set(examingHeartbeatKey, examingHeartbeat, OeConstants.TIME_OUT_7_DAY);//更新心跳缓存
 
         //设置并保存上次活动时间
         setAndSaveActiveTime(examSessionInfo.getExamRecordDataId(), ip, "examHeartbeat");

examcloud-core-oe-student-service/src/main/java/cn/com/qmth/examcloud/core/oe/student/service/impl/ExamFileAnswerServiceImpl.java

@@ -28,7 +28,7 @@ public class ExamFileAnswerServiceImpl implements ExamFileAnswerService {
      */
     @Override
     public void saveFileAnswer(String fileAnswerId, ExamFileAnswer examFileAnswer) {
-        redisClient.set(fileAnswerId, examFileAnswer, OeConstants.TIME_OUT_1_DAY);
+        redisClient.set(fileAnswerId, examFileAnswer, OeConstants.TIME_OUT_7_DAY);
     }
 
     /**