public class DiskFileItem extends Object implements FileItem
The default implementation of the
FileItem interface.
After retrieving an instance of this class from a FileUpload instance (see
#parseRequest(org.apache.tomcat.util.http.fileupload.RequestContext)), you
may either request all contents of file at once using get() or
request an InputStream with
getInputStream() and process the file without attempting to load
it into memory, which may come handy with large files.
Temporary files, which are created for file items, should be deleted later on.
| Modifier and Type | Field and Description |
|---|---|
static String |
DEFAULT_CHARSET
Default content charset to be used when no explicit charset
parameter is provided by the sender.
|
| Constructor and Description |
|---|
DiskFileItem(String fieldName,
String contentType,
boolean isFormField,
String fileName,
int sizeThreshold,
File repository)
Constructs a new
DiskFileItem instance. |
| Modifier and Type | Method and Description |
|---|---|
void |
delete()
Deletes the underlying storage for a file item, including deleting any
associated temporary disk file.
|
protected void |
finalize()
Removes the file contents from the temporary storage.
|
byte[] |
get()
Returns the contents of the file as an array of bytes.
|
String |
getCharSet()
Returns the content charset passed by the agent or
null if
not defined. |
String |
getContentType()
Returns the content type passed by the agent or
null if
not defined. |
String |
getFieldName()
Returns the name of the field in the multipart form corresponding to
this file item.
|
FileItemHeaders |
getHeaders()
Returns the file item headers.
|
InputStream |
getInputStream()
Returns an
InputStream that can be
used to retrieve the contents of the file. |
String |
getName()
Returns the original filename in the client's filesystem.
|
OutputStream |
getOutputStream()
Returns an
OutputStream that can
be used for storing the contents of the file. |
long |
getSize()
Returns the size of the file.
|
File |
getStoreLocation()
Returns the
File object for the FileItem's
data's temporary location on the disk. |
String |
getString()
Returns the contents of the file as a String, using the default
character encoding.
|
String |
getString(String charset)
Returns the contents of the file as a String, using the specified
encoding.
|
protected File |
getTempFile()
Creates and returns a
File representing a uniquely
named temporary file in the configured repository path. |
boolean |
isFormField()
Determines whether or not a
FileItem instance represents
a simple form field. |
boolean |
isInMemory()
Provides a hint as to whether or not the file contents will be read
from memory.
|
void |
setFieldName(String fieldName)
Sets the field name used to reference this file item.
|
void |
setFormField(boolean state)
Specifies whether or not a
FileItem instance represents
a simple form field. |
void |
setHeaders(FileItemHeaders pHeaders)
Sets the file item headers.
|
String |
toString()
Returns a string representation of this object.
|
void |
write(File file)
A convenience method to write an uploaded item to disk.
|
public static final String DEFAULT_CHARSET
public DiskFileItem(String fieldName, String contentType, boolean isFormField, String fileName, int sizeThreshold, File repository)
DiskFileItem instance.fieldName - The name of the form field.contentType - The content type passed by the browser or
null if not specified.isFormField - Whether or not this item is a plain form field, as
opposed to a file upload.fileName - The original filename in the user's filesystem, or
null if not specified.sizeThreshold - The threshold, in bytes, below which items will be
retained in memory and above which they will be
stored as a file.repository - The data repository, which is the directory in
which files will be created, should the item size
exceed the threshold.public InputStream getInputStream() throws IOException
InputStream that can be
used to retrieve the contents of the file.getInputStream in interface FileItemInputStream that can be
used to retrieve the contents of the file.IOException - if an error occurs.public String getContentType()
null if
not defined.getContentType in interface FileItemnull if
not defined.public String getCharSet()
null if
not defined.null if
not defined.public String getName()
getName in interface FileItemInvalidFileNameException - The file name contains a NUL character, which might be an indicator of
a security attack. If you intend to use the file name anyways, catch
the exception and use InvalidFileNameException.getName().public boolean isInMemory()
isInMemory in interface FileItemtrue if the file contents will be read
from memory; false otherwise.public long getSize()
public byte[] get()
public String getString(String charset) throws UnsupportedEncodingException
get() to retrieve the
contents of the file.getString in interface FileItemcharset - The charset to use.UnsupportedEncodingException - if the requested character
encoding is not available.public String getString()
get() to retrieve the
contents of the file.
TODO Consider making this method throw UnsupportedEncodingException.public void write(File file) throws Exception
This implementation first attempts to rename the uploaded item to the specified destination file, if the item was originally written to disk. Otherwise, the data will be copied to the specified file.
This method is only guaranteed to work once, the first time it is invoked for a particular item. This is because, in the event that the method renames a temporary file, that file will no longer be available to copy or rename again at a later time.
public void delete()
FileItem instance is garbage
collected, this method can be used to ensure that this is done at an
earlier time, thus preserving system resources.public String getFieldName()
getFieldName in interface FileItemsetFieldName(java.lang.String)public void setFieldName(String fieldName)
setFieldName in interface FileItemfieldName - The name of the form field.getFieldName()public boolean isFormField()
FileItem instance represents
a simple form field.isFormField in interface FileItemtrue if the instance represents a simple form
field; false if it represents an uploaded file.setFormField(boolean)public void setFormField(boolean state)
FileItem instance represents
a simple form field.setFormField in interface FileItemstate - true if the instance represents a simple form
field; false if it represents an uploaded file.isFormField()public OutputStream getOutputStream() throws IOException
OutputStream that can
be used for storing the contents of the file.getOutputStream in interface FileItemOutputStream that can be used
for storing the contents of the file.IOException - if an error occurs.public File getStoreLocation()
File object for the FileItem's
data's temporary location on the disk. Note that for
FileItems that have their data stored in memory,
this method will return null. When handling large
files, you can use File.renameTo(java.io.File) to
move the file to new location without copying the data, if the
source and destination locations reside within the same logical
volume.null if the data is stored in
memory.protected void finalize()
protected File getTempFile()
File representing a uniquely
named temporary file in the configured repository path. The lifetime of
the file is tied to the lifetime of the FileItem instance;
the file will be deleted when the instance is garbage collected.
Note: Subclasses that override this method must ensure that they return the same File each time.
File to be used for temporary storage.public String toString()
public FileItemHeaders getHeaders()
getHeaders in interface FileItemHeadersSupportpublic void setHeaders(FileItemHeaders pHeaders)
setHeaders in interface FileItemHeadersSupportpHeaders - The file items headers.Copyright © 2000-2016 Apache Software Foundation. All Rights Reserved.