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## org.apache.tomcat.util.http.fileupload
Class DefaultFileItem

    java.lang.Object
      org.apache.tomcat.util.http.fileupload.DefaultFileItem

All Implemented Interfaces:
  java.io.Serializable, FileItem

    public class DefaultFileItem

extends java.lang.Object
implements FileItem

The default implementation of the `FileItem` interface.

After retrieving an instance of this class from a `DiskFileUpload` instance (see `#parseRequest(javax.servlet.http.HttpServletRequest)`), 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.

Version:
  $Id: DefaultFileItem.java 467222 2006-10-24 03:17:11Z markt $
Author:
  Rafal Krzewski, Sean Legassick, Jason van Zyl, John McNally, Martin Cooper, Sean C. Sullivan
See Also:
  Serialized Form

Method Summary
`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.
`java.lang.String` | `getContentType()` Returns the content type passed by the browser or `null` if not defined.
`java.lang.String` | `getFieldName()` Returns the name of the field in the multipart form corresponding to this file item.
`java.io.InputStream` | `getInputStream()` Returns an `InputStream` that can be used to retrieve the contents of the file.
`java.lang.String` | `getName()` Returns the original filename in the client's filesystem.
`java.io.OutputStream` | `getOutputStream()` Returns an `OutputStream` that can be used for storing the contents of the file.
`long` | `getSize()` Returns the size of the file.
`java.io.File` | `getStoreLocation()` Returns the `File` object for the `FileItem`'s data's temporary location on the disk.
`java.lang.String` | `getString()` Returns the contents of the file as a String, using the default character encoding.
`java.lang.String` | `getString(java.lang.String encoding)` Returns the contents of the file as a String, using the specified encoding.
`protected java.io.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(java.lang.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` | `write(java.io.File file)` A convenience method to write an uploaded item to disk.

Methods inherited from class java.lang.Object
`clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### getInputStream

    public java.io.InputStream getInputStream()
                                       throws java.io.IOException

  Returns an `InputStream` that can be used to retrieve the contents of the file.

  Specified by:
    `getInputStream` in interface `FileItem`
  Returns:
    An `InputStream` that can be used to retrieve the contents of the file.
  Throws:
    `java.io.IOException` - if an error occurs.

### getContentType

    public java.lang.String getContentType()

  Returns the content type passed by the browser or `null` if not defined.

  Specified by:
    `getContentType` in interface `FileItem`
  Returns:
    The content type passed by the browser or `null` if not defined.

### getName

    public java.lang.String getName()

  Returns the original filename in the client's filesystem.

  Specified by:
    `getName` in interface `FileItem`
  Returns:
    The original filename in the client's filesystem.

### isInMemory

    public boolean isInMemory()

  Provides a hint as to whether or not the file contents will be read from memory.

  Specified by:
    `isInMemory` in interface `FileItem`
  Returns:
    `true` if the file contents will be read from memory; `false` otherwise.

### getSize

    public long getSize()

  Returns the size of the file.

  Specified by:
    `getSize` in interface `FileItem`
  Returns:
    The size of the file, in bytes.

### get

    public byte[] get()

  Returns the contents of the file as an array of bytes. If the contents of the file were not yet cached in memory, they will be loaded from the disk storage and cached.

  Specified by:
    `get` in interface `FileItem`
  Returns:
    The contents of the file as an array of bytes.

### getString

    public java.lang.String getString(java.lang.String encoding)
                               throws java.io.UnsupportedEncodingException

  Returns the contents of the file as a String, using the specified encoding. This method uses `get()` to retrieve the contents of the file.

  Specified by:
    `getString` in interface `FileItem`
  Parameters:
    `encoding` - The character encoding to use.
  Returns:
    The contents of the file, as a string.
  Throws:
    `java.io.UnsupportedEncodingException` - if the requested character encoding is not available.

### getString

    public java.lang.String getString()

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

  Specified by:
    `getString` in interface `FileItem`
  Returns:
    The contents of the file, as a string.

### write

    public void write(java.io.File file)
               throws java.lang.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 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.

  Specified by:
    `write` in interface `FileItem`
  Parameters:
    `file` - The `File` into which the uploaded item should be stored.
  Throws:
    `java.lang.Exception` - if an error occurs.

### delete

    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.

  Specified by:
    `delete` in interface `FileItem`

### getFieldName

    public java.lang.String getFieldName()

  Returns the name of the field in the multipart form corresponding to this file item.

  Specified by:
    `getFieldName` in interface `FileItem`
  Returns:
    The name of the form field.
  See Also:
    `setFieldName(java.lang.String)`

### setFieldName

    public void setFieldName(java.lang.String fieldName)

  Sets the field name used to reference this file item.

  Specified by:
    `setFieldName` in interface `FileItem`
  Parameters:
    `fieldName` - The name of the form field.
  See Also:
    `getFieldName()`

### isFormField

    public boolean isFormField()

  Determines whether or not a `FileItem` instance represents a simple form field.

  Specified by:
    `isFormField` in interface `FileItem`
  Returns:
    `true` if the instance represents a simple form field; `false` if it represents an uploaded file.
  See Also:
    `setFormField(boolean)`

### setFormField

    public void setFormField(boolean state)

  Specifies whether or not a `FileItem` instance represents a simple form field.

  Specified by:
    `setFormField` in interface `FileItem`
  Parameters:
    `state` - `true` if the instance represents a simple form field; `false` if it represents an uploaded file.
  See Also:
    `isFormField()`

### getOutputStream

    public java.io.OutputStream getOutputStream()
                                         throws java.io.IOException

  Returns an `OutputStream` that can be used for storing the contents of the file.

  Specified by:
    `getOutputStream` in interface `FileItem`
  Returns:
    An `OutputStream` that can be used for storing the contensts of the file.
  Throws:
    `java.io.IOException` - if an error occurs.

### getStoreLocation

    public java.io.File getStoreLocation()

  Returns the `File` object for the `FileItem`'s data's temporary location on the disk. Note that for `FileItem`s 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.

  Returns:
    The data file, or `null` if the data is stored in memory.

### finalize

    protected void finalize()

  Removes the file contents from the temporary storage.

  Overrides:
    `finalize` in class `java.lang.Object`

### getTempFile

    protected java.io.File getTempFile()

  Creates and returns a `File` representing a uniquely named temporary file in the configured repository path.

  Returns:
    The `File` to be used for temporary storage.

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