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## 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(MultiValueMap<String,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(MultiValueMap<String,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()`

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