MimetypesFileTypeMap (Java EE 5 SDK)

javax.activation Class MimetypesFileTypeMap

java.lang.Object
  javax.activation.FileTypeMap
      javax.activation.MimetypesFileTypeMap

public class MimetypesFileTypeMap

extends FileTypeMap

This class extends FileTypeMap and provides data typing of files via their file extension. It uses the .mime.types format.

MIME types file search order:

The MimetypesFileTypeMap looks in various places in the user's system for MIME types file entries. When requests are made to search for MIME types in the MimetypesFileTypeMap, it searches MIME types files in the following order:

1. Programmatically added entries to the MimetypesFileTypeMap instance.
2. The file .mime.types in the user's home directory.
3. The file <java.home>/lib/mime.types.
4. The file or resources named META-INF/mime.types.
5. The file or resource named META-INF/mimetypes.default (usually found only in the activation.jar file).

MIME types file format:

# comments begin with a '#'
# the format is <mime type> <space separated file extensions>
# for example:
text/plain txt text TXT
# this would map file.txt, file.text, and file.TXT to
# the mime type "text/plain"


作者:

Bart Calder, Bill Shannon

MimetypesFileTypeMap

public MimetypesFileTypeMap()

The default constructor.

MimetypesFileTypeMap

public MimetypesFileTypeMap(String mimeTypeFileName)
                     throws IOException

Construct a MimetypesFileTypeMap with programmatic entries added from the named file.

参数:

mimeTypeFileName - the file name

抛出异常:

IOException

MimetypesFileTypeMap

public MimetypesFileTypeMap(InputStream is)

Construct a MimetypesFileTypeMap with programmatic entries added from the InputStream.

参数:

is - the input stream to read from

addMimeTypes

public void addMimeTypes(String mime_types)

Prepend the MIME type values to the registry.

参数:

mime_types - A .mime.types formatted string of entries.

getContentType

public String getContentType(File f)

Return the MIME type of the file object. The implementation in this class calls getContentType(f.getName()).

规范说明:

getContentType in class FileTypeMap

参数:

f - the file

返回:

the file's MIME type

getContentType

public String getContentType(String filename)

Return the MIME type based on the specified file name. The MIME type entries are searched as described above under MIME types file search order. If no entry is found, the type "application/octet-stream" is returned.

规范说明:

getContentType in class FileTypeMap

参数:

filename - the file name

返回:

the file's MIME type

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