modify document verify

src/main/java/com/huiju/estateagents/service/impl/TaBuildingDynamicServiceImpl.java

 import com.huiju.estateagents.service.TaPosterService;
 import com.huiju.estateagents.service.TaShareContentService;
 import org.apache.commons.collections.CollectionUtils;
-import org.apache.poi.ss.formula.PlainCellCache;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.propertyeditors.CustomDateEditor;
 import org.springframework.stereotype.Service;