Spring Boot - Upload files on Remote Machine - spring

Question

I want to upload file on remote server, currently i am only able to upload on local machine. below is my code
#PostMapping("/upload")
public UploadFileResponse uploadFile(#RequestParam("file") MultipartFile file) {
String fileName = fileStorageService.storeFile(file);
String fileDownloadUri = ServletUriComponentsBuilder.fromCurrentContextPath()
.path("/downloadFile/")
.path(fileName)
.toUriString();
return new UploadFileResponse(fileName, fileDownloadUri,file.getContentType(), file.getSize());
}
file.upload-dir=C:\\Test
Thanks in Advance!

Answer 1

EDIT:
1. Use case : You want to upload the file locally (i.e. where your application is running):
You create StorageService interface and an implementing class FileSystemStorageService:
#Service
public class FileSystemStorageService implements StorageService {
private final Path rootLocation;
#Autowired
public FileSystemStorageService(StorageProperties properties) {
this.rootLocation = Paths.get(properties.getLocation());
}
#Override
public void store(MultipartFile file) {
String filename = StringUtils.cleanPath(file.getOriginalFilename());
try {
if (file.isEmpty()) {
throw new StorageException("Failed to store empty file " + filename);
}
if (filename.contains("..")) {
// This is a security check
throw new StorageException(
"Cannot store file with relative path outside current directory "
+ filename);
}
try (InputStream inputStream = file.getInputStream()) {
Files.copy(inputStream, this.rootLocation.resolve(filename),
StandardCopyOption.REPLACE_EXISTING);
}
}
catch (IOException e) {
throw new StorageException("Failed to store file " + filename, e);
}
}
And the controller class:
#Controller
public class FileUploadController {
private final StorageService storageService;
#Autowired
public FileUploadController(StorageService storageService) {
this.storageService = storageService;
}
#PostMapping("/")
public String handleFileUpload(#RequestParam("file") MultipartFile file,
RedirectAttributes redirectAttributes) {
storageService.store(file);
redirectAttributes.addFlashAttribute("message",
"You successfully uploaded " + file.getOriginalFilename() + "!");
return "redirect:/";
}
You can find the whole sample under https://github.com/spring-guides/gs-uploading-files.
2. Use case : You want to upload the file to a remote server:
I recommend in this case to use SFTP.
You create a RemoteFileSystemStorageService implementing the StorageService (Already created in the first use case).
#Service
public class RemoteFileSystemStorageService implements StorageService {
#Autowired
private StorageProperties properties
final private ChannelSftp channelSftp;
#PostConstruct
public void setUpSsh(){
JSch jsch = new JSch();
Session jschSession = jsch.getSession(properties.getUsername(),
properties.getRemoteHost());
jschSession.setPassword(properties.getPassword());
jschSession.connect();
this.channelSftp = (ChannelSftp)jschSession.openChannel("sftp");
}
#Override
public void store(MultipartFile file) {
String filename = StringUtils.cleanPath(file.getOriginalFilename());
try {
if (file.isEmpty()) {
throw new StorageException("Failed to store empty file " + filename);
}
if (filename.contains("..")) {
// This is a security check
throw new StorageException(
"Cannot store file with relative path outside current directory "
+ filename);
}
try (InputStream inputStream = file.getInputStream()) {
this.channelSftp.connect();
this.channelSftp.put(inputStream, properties.getRemoteServerDirectory());
}
}
catch (IOException e) {
throw new StorageException("Failed to store file " + filename, e);
}
finally{
this.channelSftp.close();
}
}