fix: use Files.copy in FileuploadService to support video and large file uploads

backend/src/main/java/com/realnet/FileUpload/Services/FileuploadService.java

@@ -1,7 +1,8 @@
 package com.realnet.FileUpload.Services;
 
 import java.io.File;
-import java.io.FileOutputStream;
+import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
 import java.io.InputStream;
 import java.util.ArrayList;
 
@@ -43,17 +44,11 @@ public class FileuploadService {
 
 
 			}
-			// reading data
-			InputStream is = multipartFile.getInputStream();
-			byte data[] = new byte[is.available()];
-			is.read(data);
-
-			// writing data
-
-			FileOutputStream fos = new FileOutputStream(filepath);
-			fos.write(data);
-			fos.close();
-			fos.flush();
+			// save file
+			File dest = new File(filepath);
+			try (InputStream is = multipartFile.getInputStream()) {
+				Files.copy(is, dest.toPath(), StandardCopyOption.REPLACE_EXISTING);
+			}
 			f = true;
 
 		} catch (Exception e) {