MultipartFile (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.web.multipart
Interface MultipartFile

All Known Implementing Classes:: CommonsMultipartFile, MockMultipartFile

public interface MultipartFile

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

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.

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.

Method Summary
`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.
`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.

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

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

getContentType

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 stream.

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)

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 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.

Parameters:: dest - the destination file
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