streamId bug fix

themis-business/src/main/java/com/qmth/themis/business/service/impl/TEMobileServiceImpl.java

@@ -130,7 +130,7 @@ public class TEMobileServiceImpl implements TEMobileService {
         ret.setMonitorKey(ExamRecordCacheUtil.getMonitorKey(recordId));
         ret.setMonitorVideoSource(monitorVideoSource);
         ret.setMonitorAudioEnable(getMonitorAudioEnable(recordId, monitorVideoSource));
-        ret.setMonitorStreamId(monitorUtil.getMonitorDomain().getPrefix() + "_" + recordId + monitorVideoSource.name().toLowerCase());
+        ret.setMonitorStreamId(monitorUtil.getMonitorDomain().getPrefix() + "_" + recordId + "_" + monitorVideoSource.name().toLowerCase());
         Source sourceEnum = monitorVideoSource.getSessionSource();
         ExamStudentCacheBean es = examStudentService
                 .getExamStudentCacheBean(ExamRecordCacheUtil.getExamStudentId(ret.getRecordId()));