单事项，辅助接件事项材料列表查询方法subList优化；材料附件下载到本地以及转换预览图片方法修改

single-matter/src/main/java/com/mortals/xhx/module/matter/service/impl/MatterDatumFileServiceImpl.java

@@ -3,6 +3,7 @@ import cn.hutool.core.io.FileUtil;
 import cn.hutool.core.util.RandomUtil;
 import com.mortals.framework.exception.AppException;
 import com.mortals.xhx.common.utils.HttpDownloadUtil;
+import com.mortals.xhx.common.utils.StringUtils;
 import com.mortals.xhx.common.utils.WordUtil;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
@@ -44,20 +45,13 @@ public class MatterDatumFileServiceImpl extends AbstractCRUDServiceImpl<MatterDa
     @Override
     protected void saveBefore(MatterDatumFileEntity entity, com.mortals.framework.model.Context context) throws AppException {
         this.validData(entity, context);
+        if(StringUtils.isNotEmpty(entity.getLocalFileUrl())){
             String rootPath = this.filePath.endsWith("/") ? this.filePath : this.filePath + "/";
             String prePath = "file/preview/";
             String savePath = entity.getLocalFileUrl();
             String newName = genPreviewPath(rootPath, prePath,  savePath);
             entity.setPreviewUrl(prePath+newName);
         }
-
-    protected void updateBefore(MatterDatumFileEntity entity, com.mortals.framework.model.Context context) throws AppException {
-        this.validData(entity, context);
-        String rootPath = this.filePath.endsWith("/") ? this.filePath : this.filePath + "/";
-        String prePath = "file/preview/";
-        String savePath = entity.getLocalFileUrl();
-        String newName = genPreviewPath(rootPath, prePath,  savePath);
-        entity.setPreviewUrl(prePath+newName);
     }
 
     private String genPreviewPath(String rootPath, String prePath, String tempPath) {