org.springframework.core.io

Class FileSystemResource

java.lang.Object

org.springframework.core.io.AbstractResource

org.springframework.core.io.FileSystemResource

All Implemented Interfaces:

InputStreamSource, Resource, WritableResource

public class FileSystemResource
extends AbstractResource
implements WritableResource

Resource implementation for java.io.File handles. Obviously supports resolution as File, and also as URL. Implements the extended WritableResource interface.

Since:

28.12.2003

Author:

Juergen Hoeller

See Also:

File

Constructor Summary

Constructors

Constructor and Description
FileSystemResource(File file) Create a new FileSystemResource from a File handle.
FileSystemResource(String path) Create a new FileSystemResource from a file path.

Method Summary

Methods

Modifier and Type	Method and Description
long	contentLength() This implementation returns the underlying File's length.
Resource	createRelative(String relativePath) This implementation creates a FileSystemResource, applying the given path relative to the path of the underlying file of this resource descriptor.
boolean	equals(Object obj) This implementation compares the underlying File references.
boolean	exists() This implementation returns whether the underlying file exists.
String	getDescription() This implementation returns a description that includes the absolute path of the file.
File	getFile() This implementation returns the underlying File reference.
String	getFilename() This implementation returns the name of the file.
InputStream	getInputStream() This implementation opens a FileInputStream for the underlying file.
OutputStream	getOutputStream() This implementation opens a FileOutputStream for the underlying file.
String	getPath() Return the file path for this resource.
URI	getURI() This implementation returns a URI for the underlying file.
URL	getURL() This implementation returns a URL for the underlying file.
int	hashCode() This implementation returns the hash code of the underlying File reference.
boolean	isReadable() This implementation checks whether the underlying file is marked as readable (and corresponds to an actual file with content, not to a directory).
boolean	isWritable() This implementation checks whether the underlying file is marked as writable (and corresponds to an actual file with content, not to a directory).

Methods inherited from class org.springframework.core.io.AbstractResource

getFileForLastModifiedCheck, isOpen, lastModified, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.springframework.core.io.Resource

isOpen, lastModified

Constructor Detail

FileSystemResource

public FileSystemResource(File file)

Create a new FileSystemResource from a File handle.

Note: When building relative resources via createRelative(java.lang.String), the relative path will apply at the same directory level: e.g. new File("C:/dir1"), relative path "dir2" -> "C:/dir2"! If you prefer to have relative paths built underneath the given root directory, use the constructor with a file path to append a trailing slash to the root path: "C:/dir1/", which indicates this directory as root for all relative paths.

Parameters:

file - a File handle

FileSystemResource

public FileSystemResource(String path)

Create a new FileSystemResource from a file path.

Note: When building relative resources via createRelative(java.lang.String), it makes a difference whether the specified resource base path here ends with a slash or not. In the case of "C:/dir1/", relative paths will be built underneath that root: e.g. relative path "dir2" -> "C:/dir1/dir2". In the case of "C:/dir1", relative paths will apply at the same directory level: relative path "dir2" -> "C:/dir2".

Parameters:

path - a file path

Method Detail

getPath

public final String getPath()

Return the file path for this resource.

exists

public boolean exists()

This implementation returns whether the underlying file exists.

Specified by:

exists in interface Resource

Overrides:

exists in class AbstractResource

See Also:

File.exists()

isReadable

public boolean isReadable()

This implementation checks whether the underlying file is marked as readable (and corresponds to an actual file with content, not to a directory).

Specified by:

isReadable in interface Resource

Overrides:

isReadable in class AbstractResource

See Also:

File.canRead(), File.isDirectory()

getInputStream

public InputStream getInputStream()
                           throws IOException

This implementation opens a FileInputStream for the underlying file.

Specified by:

getInputStream in interface InputStreamSource

Returns:

the input stream for the underlying resource (must not be null)

Throws:

IOException - if the stream could not be opened

See Also:

FileInputStream

getURL

public URL getURL()
           throws IOException

This implementation returns a URL for the underlying file.

Specified by:

getURL in interface Resource

Overrides:

getURL in class AbstractResource

Throws:

IOException - if the resource cannot be resolved as URL, i.e. if the resource is not available as descriptor

See Also:

File.toURI()

getURI

public URI getURI()
           throws IOException

This implementation returns a URI for the underlying file.

Specified by:

getURI in interface Resource

Overrides:

getURI in class AbstractResource

Throws:

IOException - if the resource cannot be resolved as URI, i.e. if the resource is not available as descriptor

See Also:

File.toURI()

getFile

public File getFile()

This implementation returns the underlying File reference.

Specified by:

getFile in interface Resource

Overrides:

getFile in class AbstractResource

contentLength

public long contentLength()
                   throws IOException

This implementation returns the underlying File's length.

Specified by:

contentLength in interface Resource

Overrides:

contentLength in class AbstractResource

Throws:

IOException - if the resource cannot be resolved (in the file system or as some other known physical resource type)

See Also:

InputStreamSource.getInputStream()

createRelative

public Resource createRelative(String relativePath)

This implementation creates a FileSystemResource, applying the given path relative to the path of the underlying file of this resource descriptor.

Specified by:

createRelative in interface Resource

Overrides:

createRelative in class AbstractResource

Parameters:

relativePath - the relative path (relative to this resource)

Returns:

the resource handle for the relative resource

See Also:

StringUtils.applyRelativePath(String, String)

getFilename

public String getFilename()

This implementation returns the name of the file.

Specified by:

getFilename in interface Resource

Overrides:

getFilename in class AbstractResource

See Also:

File.getName()

getDescription

public String getDescription()

This implementation returns a description that includes the absolute path of the file.

Specified by:

getDescription in interface Resource

See Also:

File.getAbsolutePath()

isWritable

public boolean isWritable()

This implementation checks whether the underlying file is marked as writable (and corresponds to an actual file with content, not to a directory).

Specified by:

isWritable in interface WritableResource

See Also:

File.canWrite(), File.isDirectory()

getOutputStream

public OutputStream getOutputStream()
                             throws IOException

This implementation opens a FileOutputStream for the underlying file.

Specified by:

getOutputStream in interface WritableResource

Throws:

IOException - if the stream could not be opened

See Also:

FileOutputStream

equals

public boolean equals(Object obj)

This implementation compares the underlying File references.

Overrides:

equals in class AbstractResource

See Also:

Resource.getDescription()

hashCode

public int hashCode()

This implementation returns the hash code of the underlying File reference.

Overrides:

hashCode in class AbstractResource

See Also:

Resource.getDescription()