org.springframework.web.multipart

Interface MultipartFile

All Superinterfaces:

InputStreamSource

All Known Implementing Classes:

CommonsMultipartFile, MockMultipartFile

public interface MultipartFile
extends InputStreamSource

A representation of an uploaded file received in a multipart request.

The file contents are either stored in memory or temporarily on disk. In either case, the user is responsible for copying file contents to a session-level or persistent store as and if desired. The temporary storage will be cleared at the end of request processing.

Since:

29.09.2003

Author:

Juergen Hoeller, Trevor D. Cook

See Also:

MultipartHttpServletRequest, MultipartResolver

Method Summary

Modifier and Type	Method and Description
byte[]	getBytes() Return the contents of the file as an array of bytes.
String	getContentType() Return the content type of the file.
InputStream	getInputStream() Return an InputStream to read the contents of the file from.
String	getName() Return the name of the parameter in the multipart form.
String	getOriginalFilename() Return the original filename in the client's filesystem.
default Resource	getResource() Return a Resource representation of this MultipartFile.
long	getSize() Return the size of the file in bytes.
boolean	isEmpty() Return whether the uploaded file is empty, that is, either no file has been chosen in the multipart form or the chosen file has no content.
void	transferTo(File dest) Transfer the received file to the given destination file.
default void	transferTo(Path dest) Transfer the received file to the given destination file.

Method Detail

getName

String getName()

Return the name of the parameter in the multipart form.

Returns:

the name of the parameter (never null or empty)

getOriginalFilename

@Nullable
String getOriginalFilename()

Return the original filename in the client's filesystem.

This may contain path information depending on the browser used, but it typically will not with any other than Opera.

Note: Please keep in mind this filename is supplied by the client and should not be used blindly. In addition to not using the directory portion, the file name could also contain characters such as ".." and others that can be used maliciously. It is recommended to not use this filename directly. Preferably generate a unique one and save this one one somewhere for reference, if necessary.

Returns:

the original filename, or the empty String if no file has been chosen in the multipart form, or null if not defined or not available

See Also:

FileItem.getName(), CommonsMultipartFile.setPreserveFilename(boolean), RFC 7578, Section 4.2, Unrestricted File Upload

getContentType

@Nullable
String getContentType()

Return the content type of the file.

Returns:

the content type, or null if not defined (or no file has been chosen in the multipart form)

isEmpty

boolean isEmpty()

Return whether the uploaded file is empty, that is, either no file has been chosen in the multipart form or the chosen file has no content.

getSize

long getSize()

Return the size of the file in bytes.

Returns:

the size of the file, or 0 if empty

getBytes

byte[] getBytes()
         throws IOException

Return the contents of the file as an array of bytes.

Returns:

the contents of the file as bytes, or an empty byte array if empty

Throws:

IOException - in case of access errors (if the temporary store fails)

getInputStream

InputStream getInputStream()
                    throws IOException

Return an InputStream to read the contents of the file from.

The user is responsible for closing the returned stream.

Specified by:

getInputStream in interface InputStreamSource

Returns:

the contents of the file as stream, or an empty stream if empty

Throws:

IOException - in case of access errors (if the temporary store fails)

See Also:

Resource.isReadable()

getResource

default Resource getResource()

Return a Resource representation of this MultipartFile. This can be used as input to the RestTemplate or the WebClient to expose content length and the filename along with the InputStream.

Returns:

this MultipartFile adapted to the Resource contract

Since:

5.1

transferTo

void transferTo(File dest)
         throws IOException,
                IllegalStateException

Transfer the received file to the given destination file.

This may either move the file in the filesystem, copy the file in the filesystem, or save memory-held contents to the destination file. If the destination file already exists, it will be deleted first.

If the target file has been moved in the filesystem, this operation cannot be invoked again afterwards. Therefore, call this method just once in order to work with any storage mechanism.

NOTE: Depending on the underlying provider, temporary storage may be container-dependent, including the base directory for relative destinations specified here (e.g. with Servlet 3.0 multipart handling). For absolute destinations, the target file may get renamed/moved from its temporary location or newly copied, even if a temporary copy already exists.

Parameters:

dest - the destination file (typically absolute)

Throws:

IOException - in case of reading or writing errors

IllegalStateException - if the file has already been moved in the filesystem and is not available anymore for another transfer

See Also:

FileItem.write(File), Part.write(String)

transferTo

default void transferTo(Path dest)
                 throws IOException,
                        IllegalStateException

Transfer the received file to the given destination file.

The default implementation simply copies the file input stream.

Throws:

IOException

IllegalStateException

Since:

5.1

See Also:

getInputStream(), transferTo(File)