update

examcloud-task-api-provider/src/main/java/cn/com/qmth/examcloud/task/api/controller/ExamStudentImportController.java

@@ -92,7 +92,7 @@ public class ExamStudentImportController extends ControllerSupport {
 		String suffix = originalFilename.substring(originalFilename.indexOf("."));
 		long batchId = System.currentTimeMillis();
 		String name = new StringBuilder().append(rootOrgId).append("_").append(examId).append("_")
-				.append(DateUtil.now(DatePatterns.YYYYMMDDHHMM)).toString();
+				.append(DateUtil.now(DatePatterns.YYYYMMDDHHMMSSSSS)).toString();
 
 		String destFileName = name + suffix;
 		String resultFileName = name + ".txt";