批量下载pdf名称优化

distributed-print-business/src/main/java/com/qmth/distributed/print/business/bean/dto/ExamDetailPdfDownloadDto.java

@@ -3,8 +3,6 @@ package com.qmth.distributed.print.business.bean.dto;
 import com.qmth.distributed.print.business.entity.ExamDetail;
 import io.swagger.annotations.ApiModelProperty;
 
-import java.io.File;
-
 /**
  * @Description: examDetail pdf dto
  * @Param: