Thanks for your reply.
Yes Now I use the FormFile to upload. Even in this FormFile, I am not able to check the existence of the file. Have given my sample code below.
FileUploadForm fileUploadForm = (FileUploadForm) form;
FormFile file = fileUploadForm.getFile();
/**Here I would like to include the check to verify the existence of the file **/
String filePath = "Network path to upload the file";
if(!fileName.equals("")){
File fileToCreate = new File(filePath, fileName);
FileOutputStream fileOutStream = new FileOutputStream(fileToCreate);
fileOutStream.write(file.getFileData());
fileOutStream.flush();
fileOutStream.close();
}