如果设备目录里已存在同名文件，则新文件保存为 原名_yyyyMMdd_HHmmss.扩展名

cclqms-java/src/main/java/com/gaotao/modules/reader/service/impl/ClientFileCollectorServiceImpl.java

@@ -12,7 +12,8 @@ import java.io.InputStream;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
-import java.nio.file.StandardCopyOption;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
 import java.util.UUID;
 
 @Service
@@ -23,6 +24,7 @@ public class ClientFileCollectorServiceImpl implements ClientFileCollectorServic
      * 服务端统一落盘目录：D:\qms-dataCollection
      */
     private static final Path SERVER_ROOT_PATH = Paths.get("D:\\qms-dataCollection");
+    private static final DateTimeFormatter FILE_TIME_SUFFIX_FORMATTER = DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss");
 
     @Override
     public CollectorUploadResultData uploadFile(MultipartFile file, String site, String buNo, String equipmentNo) {
@@ -41,11 +43,12 @@ public class ClientFileCollectorServiceImpl implements ClientFileCollectorServic
         String originalFileName = StringUtils.defaultIfBlank(file.getOriginalFilename(), UUID.randomUUID() + ".dat");
         String safeFileName = this.toSafeFileName(originalFileName);
         Path equipmentFolderPath = SERVER_ROOT_PATH.resolve(safeEquipmentNo);
-        Path targetPath = equipmentFolderPath.resolve(safeFileName);
+        Path targetPath;
         try {
             Files.createDirectories(equipmentFolderPath);
+            targetPath = this.resolveTargetPathWithTimeSuffix(equipmentFolderPath, safeFileName);
             try (InputStream inputStream = file.getInputStream()) {
-                Files.copy(inputStream, targetPath, StandardCopyOption.REPLACE_EXISTING);
+                Files.copy(inputStream, targetPath);
             }
             log.info("客户端文件上传成功: site={}, buNo={}, equipmentNo={}, path={}",
                     site, buNo, equipmentNo, targetPath);
@@ -57,12 +60,39 @@ public class ClientFileCollectorServiceImpl implements ClientFileCollectorServic
         result.setSite(site);
         result.setBuNo(buNo);
         result.setEquipmentNo(equipmentNo);
-        result.setSavedFileName(safeFileName);
+        result.setSavedFileName(targetPath.getFileName().toString());
         result.setSavedFullPath(targetPath.toString());
         result.setFileSize(file.getSize());
         return result;
     }
 
+    /**
+     * 目标文件已存在时，为新文件自动追加时间后缀，避免覆盖历史文件。
+     */
+    private Path resolveTargetPathWithTimeSuffix(Path folderPath, String safeFileName) {
+        Path originalTargetPath = folderPath.resolve(safeFileName);
+        if (!Files.exists(originalTargetPath)) {
+            return originalTargetPath;
+        }
+
+        String baseName = safeFileName;
+        String extension = "";
+        int dotIndex = safeFileName.lastIndexOf('.');
+        if (dotIndex > 0 && dotIndex < safeFileName.length() - 1) {
+            baseName = safeFileName.substring(0, dotIndex);
+            extension = safeFileName.substring(dotIndex);
+        }
+
+        String timeSuffix = LocalDateTime.now().format(FILE_TIME_SUFFIX_FORMATTER);
+        Path targetPath = folderPath.resolve(baseName + "_" + timeSuffix + extension);
+        int index = 1;
+        while (Files.exists(targetPath)) {
+            targetPath = folderPath.resolve(baseName + "_" + timeSuffix + "_" + index + extension);
+            index++;
+        }
+        return targetPath;
+    }
+
     private String toSafeFileName(String fileName) {
         String safeFileName = fileName.replaceAll("[\\\\/:*?\"<>|]", "_").trim();
         if (StringUtils.isBlank(safeFileName)) {