public  void delete()
Deletes the underlying storage for a file item, including deleting any
associated temporary disk file. Although this storage will be deleted
automatically when the 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 byte[] get()
Returns the contents of the file item as an array of bytes.

 public String getContentType()
Returns the content type passed by the browser or null if
not defined.

 public String getFieldName()
Returns the name of the field in the multipart form corresponding to
this file item.

 public InputStream getInputStream() throws IOException
Returns an InputStream  that can be
used to retrieve the contents of the file.

 public String getName()
Returns the original filename in the client's filesystem, as provided by
the browser (or other client software). In most cases, this will be the
base file name, without path information. However, some clients, such as
the Opera browser, do include path information.

 public OutputStream getOutputStream() throws IOException
Returns an OutputStream  that can
be used for storing the contents of the file.

 public long getSize()
Returns the size of the file item.

 public String getString()
Returns the contents of the file item as a String, using the default
character encoding. This method uses #get()  to retrieve the
contents of the item.

 public String getString(String encoding) throws UnsupportedEncodingException
Returns the contents of the file item as a String, using the specified
encoding. This method uses #get()  to retrieve the
contents of the item.

 public boolean isFormField()
Determines whether or not a FileItem instance represents
a simple form field.

 public boolean isInMemory()
Provides a hint as to whether or not the file contents will be read
from memory.

 public  void setFieldName(String name)
Sets the field name used to reference this file item.

 public  void setFormField(boolean state)
Specifies whether or not a FileItem instance represents
a simple form field.

 public  void write(File file) throws Exception
A convenience method to write an uploaded item to disk. The client code
is not concerned with whether or not the item is stored in memory, or on
disk in a temporary location. They just want to write the uploaded item
to a file.

This method is not guaranteed to succeed if called more than once for
the same item. This allows a particular implementation to use, for
example, file renaming, where possible, rather than copying all of the
underlying data, thus gaining a significant performance benefit.