org.springframework.web.multipart

Interface MultipartFile

All Superinterfaces:

InputStreamSource

All Known Implementing Classes:

CommonsMultipartFile, MockMultipartFile, StandardMultipartHttpServletRequest.StandardMultipartFile

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 storages 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.
java.lang.String	getContentType() Return the content type of the file.
java.io.InputStream	getInputStream() Return an InputStream to read the contents of the file from.
java.lang.String	getName() Return the name of the parameter in the multipart form.
java.lang.String	getOriginalFilename() Return the original filename in the client's filesystem.
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(java.io.File dest) Transfer the received file to the given destination file.

Method Detail

getName

java.lang.String getName()

Return the name of the parameter in the multipart form.

Returns:

the name of the parameter (never null or empty)

getOriginalFilename

java.lang.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.

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

getContentType

java.lang.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 java.io.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:

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

getInputStream

java.io.InputStream getInputStream()
                            throws java.io.IOException

Return an InputStream to read the contents of the file from. The user is responsible for closing the stream.

Specified by:

getInputStream in interface InputStreamSource

Returns:

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

Throws:

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

See Also:

MimeMessageHelper.addAttachment(String, InputStreamSource)

transferTo

void transferTo(java.io.File dest)
         throws java.io.IOException,
                java.lang.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 file has been moved in the filesystem, this operation cannot be invoked again. Therefore, call this method just once to be able to work with any storage mechanism.

Note: when using Servlet 3.0 multipart support you need to configure the location relative to which files will be copied as explained in javax.servlet.http.Part#write.

Parameters:

dest - the destination file

Throws:

java.io.IOException - in case of reading or writing errors

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