文件名重复问题修复

src/main/java/com/zcloud/util/Warden.java

@@ -380,6 +380,8 @@ public class Warden {
                 String fileName = file.getName();
                 if (fileNames.contains(fileName)){
                     fileName = (random.nextInt(90000) + 10000) + fileName;
+                } else {
+                    fileNames = fileNames + fileName + ",";
                 }
                 ZipEntry zipEntry = new ZipEntry(fileName);
                 zipOut.putNextEntry(zipEntry);