Package org.springframework.core.io

Class PathResource

java.lang.Object

org.springframework.core.io.AbstractResource

org.springframework.core.io.PathResource

All Implemented Interfaces:

InputStreamSource, Resource, WritableResource

public class PathResource
extends AbstractResource
implements WritableResource

Resource implementation for Path handles, performing all operations and transformations via the Path API. Supports resolution as a File and also as a URL. Implements the extended WritableResource interface.

Note: As of 5.1, Path support is also available in FileSystemResource, applying Spring's standard String-based path transformations but performing all operations via the Files API. This PathResource is effectively a pure java.nio.path.Path based alternative with different createRelative behavior.

Since:

4.0

Author:

Philippe Marschall, Juergen Hoeller

See Also:

• Path
• Files
• FileSystemResource

Constructor Summary

Constructors

Constructor	Description
PathResource(String path)	Create a new PathResource from a path string.
PathResource(URI uri)	Create a new PathResource from a URI.
PathResource(Path path)	Create a new PathResource from a Path handle.

Method Summary

Modifier and Type	Method	Description
long	contentLength()	This implementation returns the underlying file's length.
Resource	createRelative(String relativePath)	This implementation creates a PathResource, applying the given path relative to the path of the underlying file of this resource descriptor.
boolean	equals(Object other)	This implementation compares the underlying Path references.
boolean	exists()	This implementation returns whether the underlying file exists.
byte[]	getContentAsByteArray()	Return the contents of this resource as a byte array.
String	getContentAsString(Charset charset)	Returns the contents of this resource as a string, using the specified charset.
String	getDescription()	Return a description for this resource, to be used for error output when working with the resource.
File	getFile()	This implementation returns the underlying File reference.
String	getFilename()	This implementation returns the name of the file.
InputStream	getInputStream()	This implementation opens an InputStream for the underlying file.
OutputStream	getOutputStream()	This implementation opens an OutputStream for the underlying file.
final 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 Path reference.
boolean	isFile()	This implementation always indicates a file.
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).
long	lastModified()	This implementation returns the underlying file's timestamp.
ReadableByteChannel	readableChannel()	This implementation opens a ReadableByteChannel for the underlying file.
WritableByteChannel	writableChannel()	This implementation opens a WritableByteChannel for the underlying file.

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

getFileForLastModifiedCheck, isOpen, 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

Constructor Details

PathResource

public PathResource(Path path)

Create a new PathResource from a Path handle.

Note: Unlike FileSystemResource, when building relative resources via createRelative(java.lang.String), the relative path will be built underneath the given root: e.g. Paths.get("C:/dir1/"), relative path "dir2" → "C:/dir1/dir2"!

Parameters:

path - a Path handle

PathResource

public PathResource(String path)

Create a new PathResource from a path string.

Note: Unlike FileSystemResource, when building relative resources via createRelative(java.lang.String), the relative path will be built underneath the given root: e.g. Paths.get("C:/dir1/"), relative path "dir2" → "C:/dir1/dir2"!

Parameters:

path - a path

See Also:

• Paths.get(String, String...)

PathResource

public PathResource(URI uri)

Create a new PathResource from a URI.

Note: Unlike FileSystemResource, when building relative resources via createRelative(java.lang.String), the relative path will be built underneath the given root: e.g. Paths.get("C:/dir1/"), relative path "dir2" → "C:/dir1/dir2"!

Parameters:

uri - a path URI

See Also:

• Paths.get(URI)

Method Details

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:

• Files.exists(Path, java.nio.file.LinkOption...)

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:

• Files.isReadable(Path)
• Files.isDirectory(Path, java.nio.file.LinkOption...)

getInputStream

public InputStream getInputStream()
                           throws IOException

This implementation opens an InputStream for the underlying file.

Specified by:

getInputStream in interface InputStreamSource

Returns:

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

Throws:

FileNotFoundException - if the underlying resource does not exist

IOException - if the content stream could not be opened

See Also:

• FileSystemProvider.newInputStream(Path, OpenOption...)

getContentAsByteArray

public byte[] getContentAsByteArray()
                             throws IOException

Description copied from interface: Resource

Return the contents of this resource as a byte array.

Specified by:

getContentAsByteArray in interface Resource

Returns:

the contents of this resource as byte array

Throws:

FileNotFoundException - if the resource cannot be resolved as absolute file path, i.e. if the resource is not available in a file system

IOException - in case of general resolution/reading failures

getContentAsString

public String getContentAsString(Charset charset)
                          throws IOException

Description copied from interface: Resource

Returns the contents of this resource as a string, using the specified charset.

Specified by:

getContentAsString in interface Resource

Parameters:

charset - the charset to use for decoding

Returns:

the contents of this resource as a String

Throws:

FileNotFoundException - if the resource cannot be resolved as absolute file path, i.e. if the resource is not available in a file system

IOException - in case of general resolution/reading failures

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:

• Files.isWritable(Path)
• Files.isDirectory(Path, java.nio.file.LinkOption...)

getOutputStream

public OutputStream getOutputStream()
                             throws IOException

This implementation opens an OutputStream for the underlying file.

Specified by:

getOutputStream in interface WritableResource

Throws:

IOException - if the stream could not be opened

See Also:

• FileSystemProvider.newOutputStream(Path, OpenOption...)

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 a descriptor

See Also:

• Path.toUri()
• URI.toURL()

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 a descriptor

See Also:

• Path.toUri()

isFile

public boolean isFile()

This implementation always indicates a file.

Specified by:

isFile in interface Resource

Overrides:

isFile in class AbstractResource

See Also:

• Resource.getFile()

getFile

public File getFile()
             throws IOException

This implementation returns the underlying File reference.

Specified by:

getFile in interface Resource

Overrides:

getFile in class AbstractResource

Throws:

FileNotFoundException - if the resource cannot be resolved as absolute file path, i.e. if the resource is not available in a file system

IOException - in case of general resolution/reading failures

See Also:

• InputStreamSource.getInputStream()

readableChannel

public ReadableByteChannel readableChannel()
                                    throws IOException

This implementation opens a ReadableByteChannel for the underlying file.

Specified by:

readableChannel in interface Resource

Overrides:

readableChannel in class AbstractResource

Returns:

the byte channel for the underlying resource (must not be null)

Throws:

FileNotFoundException - if the underlying resource doesn't exist

IOException - if the content channel could not be opened

See Also:

• Files.newByteChannel(Path, OpenOption...)

writableChannel

public WritableByteChannel writableChannel()
                                    throws IOException

This implementation opens a WritableByteChannel for the underlying file.

Specified by:

writableChannel in interface WritableResource

Returns:

the byte channel for the underlying resource (must not be null)

Throws:

FileNotFoundException - if the underlying resource doesn't exist

IOException - if the content channel could not be opened

See Also:

• Files.newByteChannel(Path, OpenOption...)

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()

lastModified

public long lastModified()
                  throws IOException

This implementation returns the underlying file's timestamp.

Specified by:

lastModified in interface Resource

Overrides:

lastModified 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:

• Files.getLastModifiedTime(Path, java.nio.file.LinkOption...)

createRelative

public Resource createRelative(String relativePath)

This implementation creates a PathResource, 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:

• Path.resolve(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:

• Path.getFileName()

getDescription

public String getDescription()

Description copied from interface: Resource

Return a description for this resource, to be used for error output when working with the resource.

Implementations are also encouraged to return this value from their toString method.

Specified by:

getDescription in interface Resource

See Also:

• Object.toString()

equals

public boolean equals(@Nullable
 Object other)

This implementation compares the underlying Path references.

Overrides:

equals in class AbstractResource

See Also:

• Resource.getDescription()

hashCode

public int hashCode()

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

Overrides:

hashCode in class AbstractResource

See Also:

• Resource.getDescription()