File upload api - MultipartFile

MultipartFile

Method summary
byte[]	getBytes()  Returns the contents of the file as a byte array.
String	getContentType()  Returns the content type of the file.
InputStream	getInputStream()  Returns the InputStream to read the contents of the file.
String	getName()  Returns the name of the parameter in multipart form.
String	getOriginalFilename()  Returns the original filename on the client's filesystem.
long	getSize()  Returns the size of the file, in bytes.
boolean	isEmpty()  Returns whether the uploaded file is empty, that is, no file is selected in the multipart form or the selected file has no content.
void	transferTo(File dest)  Transfer the received file to the given destination file.

 

method details

getName

String  getName ()

Returns the name of the parameter in multipart form.

 

return:

the name of the parameter (none null or empty)

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getOriginalFilename

 String skew getOriginalFilename ( )

Returns the original filename on the client's filesystem.

This may contain path information depending on the browser used, but it usually does not work with anything other than Opera.

 

return:

the original filename, or an empty string if no file is selected in multipart form

---

getContentType

String  getContentType ()

Returns the content type of the file.

 

return:

content null -type, or if not defined (or multipart not selected file form)

---

isEmpty

boolean isEmpty ()

Returns whether the uploaded file is empty, that is, no file is selected in the multipart form or the selected file has no content.

 

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getSize

长getSize()

Returns the size of the file, in bytes.

 

return:

the size of the file, if empty or 0

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getBytes

byte[]getBytes()
throw IOException

Returns the contents of the file as a byte array.

 

return:

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

throws:

IOException In case of access error (if temporary storage fails)

---

getInputStream

InputStream getInputStream()
throw IOException

Returns the InputStream to read the contents of the file. The user is responsible for closing the stream.

 

return:

the content stream of the file, if empty or empty stream

throws:

IOException In case of access error (if temporary storage fails)

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transferTo

void transferTo ( file table)
抛出IOException,IllegalStateException

Transfer the received file to the given destination file.

This can move the file to the file system, copy the file to the file system, or save the memory contents to the target file. If the target file already exists, it will be deleted.

If the file is moved to the filesystem, this operation cannot be called again. Therefore, calling this method can apply to any storage mechanism only once.

 

parameter:

dest --Target file

throws:

IOException - errors in reading or writing

IllegalStateException If the file has been moved on the file system and is unavailable for another transfer