文件下载工具方法修改：如果文件名称长度太短，自动拼接2个下划线字符

gic-enterprise-download/src/main/java/com/gic/download/utils/DownloadUtils.java

@@ -136,6 +136,10 @@ public class DownloadUtils {
         DataDownloadUtils.mkDir(new File(tempPath));
         File file = new File(tempPath);
         //初始化数据
+        if (fileName.length() < 3) {
+            //如果长度太短
+            fileName = fileName + "__";
+        }
         tempFile = File.createTempFile(fileName, ExcelExtensionEnum.getExtensionByCode(excelExtensionCode), file);
         final OutputStream out = new FileOutputStream(tempFile);
         try {