Java：MultiDataSource 解决上传文件报错 fileNames NPE

Author: TommyLemon

APIJSON-Java-Server/APIJSONBoot-MultiDataSource/src/main/java/apijson/boot/FileController.java

@@ -108,7 +108,9 @@ public JSONObject upload(@RequestParam("file") MultipartFile file) {
 			fileOutputStream.write(file.getBytes());
 			fileOutputStream.close();
 
-			fileNames.add(file.getOriginalFilename());
+			if (fileNames != null && ! fileNames.isEmpty()) {
+				fileNames.add(file.getOriginalFilename());
+			}
 
 			JSONObject res = new JSONObject();
 			res.put("path", "/download/" + file.getOriginalFilename());