org.springframework.web.multipart.commons
Class CommonsFileUploadSupport

java.lang.Object
  org.springframework.web.multipart.commons.CommonsFileUploadSupport

Direct Known Subclasses:

CommonsMultipartResolver, CommonsPortletMultipartResolver

public abstract class CommonsFileUploadSupport
extends Object

Base class for multipart resolvers that use Jakarta Commons FileUpload 1.2 or above.

Provides common configuration properties and parsing functionality for multipart requests, using a Map of Spring CommonsMultipartFile instances as representation of uploaded files and a String-based parameter Map as representation of uploaded form fields.

Subclasses implement concrete resolution strategies for Servlet or Portlet environments: see CommonsMultipartResolver and CommonsPortletMultipartResolver, respectively. This base class is not tied to either of those APIs, factoring out common functionality.

Since:

2.0

Author:

Juergen Hoeller

See Also:

CommonsMultipartFile, CommonsMultipartResolver, CommonsPortletMultipartResolver

Nested Class Summary

protected static class

CommonsFileUploadSupport.MultipartParsingResult Holder for a Map of Spring MultipartFiles and a Map of multipart parameters.

Field Summary

protected Log

logger

Constructor Summary

CommonsFileUploadSupport()
Instantiate a new CommonsFileUploadSupport with its corresponding FileItemFactory and FileUpload instances.

Method Summary

protected void	cleanupFileItems(Collection<MultipartFile> multipartFiles) Cleanup the Spring MultipartFiles created during multipart parsing, potentially holding temporary data on disk.
protected String	getDefaultEncoding()
DiskFileItemFactory	getFileItemFactory() Return the underlying org.apache.commons.fileupload.disk.DiskFileItemFactory instance.
FileUpload	getFileUpload() Return the underlying org.apache.commons.fileupload.FileUpload instance.
protected boolean	isUploadTempDirSpecified()
protected DiskFileItemFactory	newFileItemFactory() Factory method for a Commons DiskFileItemFactory instance.
protected abstract FileUpload	newFileUpload(FileItemFactory fileItemFactory) Factory method for a Commons FileUpload instance.
protected CommonsFileUploadSupport.MultipartParsingResult	parseFileItems(List<FileItem> fileItems, String encoding) Parse the given List of Commons FileItems into a Spring MultipartParsingResult, containing Spring MultipartFile instances and a Map of multipart parameter.
protected FileUpload	prepareFileUpload(String encoding) Determine an appropriate FileUpload instance for the given encoding.
void	setDefaultEncoding(String defaultEncoding) Set the default character encoding to use for parsing requests, to be applied to headers of individual parts and to form fields.
void	setMaxInMemorySize(int maxInMemorySize) Set the maximum allowed size (in bytes) before uploads are written to disk.
void	setMaxUploadSize(long maxUploadSize) Set the maximum allowed size (in bytes) before uploads are refused.
void	setUploadTempDir(Resource uploadTempDir) Set the temporary directory where uploaded files get stored.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

logger

protected final Log logger

Constructor Detail

CommonsFileUploadSupport

public CommonsFileUploadSupport()

Instantiate a new CommonsFileUploadSupport with its corresponding FileItemFactory and FileUpload instances.

See Also:

newFileItemFactory(), newFileUpload(org.apache.commons.fileupload.FileItemFactory)

Method Detail

getFileItemFactory

public DiskFileItemFactory getFileItemFactory()

Return the underlying org.apache.commons.fileupload.disk.DiskFileItemFactory instance. There is hardly any need to access this.

Returns:

the underlying DiskFileItemFactory instance

getFileUpload

public FileUpload getFileUpload()

Return the underlying org.apache.commons.fileupload.FileUpload instance. There is hardly any need to access this.

Returns:

the underlying FileUpload instance

setMaxUploadSize

public void setMaxUploadSize(long maxUploadSize)

Set the maximum allowed size (in bytes) before uploads are refused. -1 indicates no limit (the default).

Parameters:

maxUploadSize - the maximum upload size allowed

See Also:

FileUploadBase.setSizeMax(long)

setMaxInMemorySize

public void setMaxInMemorySize(int maxInMemorySize)

Set the maximum allowed size (in bytes) before uploads are written to disk. Uploaded files will still be received past this amount, but they will not be stored in memory. Default is 10240, according to Commons FileUpload.

Parameters:

maxInMemorySize - the maximum in memory size allowed

See Also:

DiskFileItemFactory.setSizeThreshold(int)

setDefaultEncoding

public void setDefaultEncoding(String defaultEncoding)

Set the default character encoding to use for parsing requests, to be applied to headers of individual parts and to form fields. Default is ISO-8859-1, according to the Servlet spec.

If the request specifies a character encoding itself, the request encoding will override this setting. This also allows for generically overriding the character encoding in a filter that invokes the ServletRequest.setCharacterEncoding method.

Parameters:

defaultEncoding - the character encoding to use

See Also:

ServletRequest.getCharacterEncoding(), ServletRequest.setCharacterEncoding(java.lang.String), WebUtils.DEFAULT_CHARACTER_ENCODING, FileUploadBase.setHeaderEncoding(java.lang.String)

getDefaultEncoding

protected String getDefaultEncoding()

setUploadTempDir

public void setUploadTempDir(Resource uploadTempDir)
                      throws IOException

Set the temporary directory where uploaded files get stored. Default is the servlet container's temporary directory for the web application.

Throws:

IOException

See Also:

WebUtils.TEMP_DIR_CONTEXT_ATTRIBUTE

isUploadTempDirSpecified

protected boolean isUploadTempDirSpecified()

newFileItemFactory

protected DiskFileItemFactory newFileItemFactory()

Factory method for a Commons DiskFileItemFactory instance.

Default implementation returns a standard DiskFileItemFactory. Can be overridden to use a custom subclass, e.g. for testing purposes.

Returns:

the new DiskFileItemFactory instance

newFileUpload

protected abstract FileUpload newFileUpload(FileItemFactory fileItemFactory)

Factory method for a Commons FileUpload instance.

To be implemented by subclasses.

Parameters:

fileItemFactory - the Commons FileItemFactory to build upon

Returns:

the Commons FileUpload instance

prepareFileUpload

protected FileUpload prepareFileUpload(String encoding)

Determine an appropriate FileUpload instance for the given encoding.

Default implementation returns the shared FileUpload instance if the encoding matches, else creates a new FileUpload instance with the same configuration other than the desired encoding.

Parameters:

encoding - the character encoding to use

Returns:

an appropriate FileUpload instance.

parseFileItems

protected CommonsFileUploadSupport.MultipartParsingResult parseFileItems(List<FileItem> fileItems,
                                                                         String encoding)

Parse the given List of Commons FileItems into a Spring MultipartParsingResult, containing Spring MultipartFile instances and a Map of multipart parameter.

Parameters:

fileItems - the Commons FileIterms to parse

encoding - the encoding to use for form fields

Returns:

the Spring MultipartParsingResult

See Also:

CommonsMultipartFile.CommonsMultipartFile(org.apache.commons.fileupload.FileItem)

cleanupFileItems

protected void cleanupFileItems(Collection<MultipartFile> multipartFiles)

Cleanup the Spring MultipartFiles created during multipart parsing, potentially holding temporary data on disk.

Deletes the underlying Commons FileItem instances.

Parameters:

multipartFiles - Collection of MultipartFile instances

See Also:

FileItem.delete()