Change the name of MultipartFile - spring-boot

Question

I'm trying to change the name of MultipartFile.
I'm using MultipartFile on my controller to call rest service:
#PostMapping("/post")
public ResponseEntity<String> handleFileUpload(#RequestParam("file") MultipartFile file)
{
...
}
Have you please any idea about changing the OriginalFilename of the uploaded file ?.
Big thanks.

Answer 1

You can try the following code.
#PostMapping("/post")
public ResponseEntity<String> handleFileUpload(#RequestParam("file") MultipartFile file)
{
try {
String filename = "random_filename.pdf"; // Give a random filename here.
byte[] bytes = file.getBytes();
String insPath = <DIRECTORY PATH> + filename // Directory path where you want to save ;
Files.write(Paths.get(insPath), bytes);
return ResponseEntity.ok(filename);
}
catch (IOException e) {
// Handle exception here
}
}
You have to remember to add a random string to the file name. If you just hard code the file name, every time you upload a file, the previous file will be replaced.

Answer 2

You can achieve renaming of a file as below. To verify go the uploadDir and you will have a file with "renameTest".
You can append clientId + uploadTime to a filename to avoid the same filenames in database
#PostMapping(value = "/post")
public String renameMultipartFile(#RequestParam("file") MultipartFile file) {
String uploadDir = "yourPath";
String filename = "renameTest";
Path saveTO = Paths.get(uploadDir + filename);
try {
try {
Files.copy(file.getInputStream(), saveTO);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("Error : " + e.getMessage());
}
return "File uploaded successfully";
} catch (Exception e) {
e.printStackTrace();
return "Error : " + e.getMessage();
}
}