Package org.springframework.core.io

Class FileUrlResource

java.lang.Object

org.springframework.core.io.AbstractResource

org.springframework.core.io.AbstractFileResolvingResource

org.springframework.core.io.UrlResource

org.springframework.core.io.FileUrlResource

All Implemented Interfaces:

InputStreamSource, Resource, WritableResource

public class FileUrlResource
extends UrlResource
implements WritableResource

Subclass of UrlResource which assumes file resolution, to the degree of implementing the WritableResource interface for it. This resource variant also caches resolved File handles from getFile().

This is the class resolved by DefaultResourceLoader for a "file:..." URL location, allowing a downcast to WritableResource for it.

Alternatively, for direct construction from a File handle or NIO Path, consider using FileSystemResource.

Since:

5.0.2

Author:

Juergen Hoeller

Constructor Summary

Constructors

Constructor	Description
FileUrlResource(String location)	Create a new FileUrlResource based on the given file location, using the URL protocol "file".
FileUrlResource(URL url)	Create a new FileUrlResource based on the given URL object.

Method Summary

Modifier and Type	Method	Description
Resource	createRelative(String relativePath)	This implementation creates a UrlResource, delegating to UrlResource.createRelativeURL(String) for adapting the relative path.
File	getFile()	This implementation returns a File reference for the underlying URL/URI, provided that it refers to a file in the file system.
OutputStream	getOutputStream()	Return an OutputStream for the underlying resource, allowing to (over-)write its content.
boolean	isWritable()	Indicate whether the contents of this resource can be written via WritableResource.getOutputStream().
WritableByteChannel	writableChannel()	Return a WritableByteChannel.

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

createRelativeURL, equals, from, from, getDescription, getFilename, getInputStream, getURI, getURL, hashCode, isFile

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

contentLength, customizeConnection, customizeConnection, exists, getFile, getFileForLastModifiedCheck, isFile, isReadable, lastModified, readableChannel

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

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.InputStreamSource

getInputStream

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

contentLength, exists, getContentAsByteArray, getContentAsString, getDescription, getFilename, getURI, getURL, isFile, isOpen, isReadable, lastModified, readableChannel

Constructor Details

FileUrlResource

public FileUrlResource(URL url)

Create a new FileUrlResource based on the given URL object.

Note that this does not enforce "file" as URL protocol. If a protocol is known to be resolvable to a file, it is acceptable for this purpose.

Parameters:

url - a URL

See Also:

• ResourceUtils.isFileURL(URL)
• getFile()

FileUrlResource

public FileUrlResource(String location)
                throws MalformedURLException

Create a new FileUrlResource based on the given file location, using the URL protocol "file".

The given parts will automatically get encoded if necessary.

Parameters:

location - the location (i.e. the file path within that protocol)

Throws:

MalformedURLException - if the given URL specification is not valid

See Also:

• UrlResource(String, String)
• ResourceUtils.URL_PROTOCOL_FILE

Method Details

getFile

public File getFile()
             throws IOException

Description copied from class: UrlResource

This implementation returns a File reference for the underlying URL/URI, provided that it refers to a file in the file system.

Specified by:

getFile in interface Resource

Overrides:

getFile in class UrlResource

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:

• ResourceUtils.getFile(java.net.URL, String)

isWritable

public boolean isWritable()

Description copied from interface: WritableResource

Indicate whether the contents of this resource can be written via WritableResource.getOutputStream().

Will be true for typical resource descriptors; note that actual content writing may still fail when attempted. However, a value of false is a definitive indication that the resource content cannot be modified.

Specified by:

isWritable in interface WritableResource

See Also:

• WritableResource.getOutputStream()
• Resource.isReadable()

getOutputStream

public OutputStream getOutputStream()
                             throws IOException

Description copied from interface: WritableResource

Return an OutputStream for the underlying resource, allowing to (over-)write its content.

Specified by:

getOutputStream in interface WritableResource

Throws:

IOException - if the stream could not be opened

See Also:

• InputStreamSource.getInputStream()

writableChannel

public WritableByteChannel writableChannel()
                                    throws IOException

Description copied from interface: WritableResource

Return a WritableByteChannel.

It is expected that each call creates a fresh channel.

The default implementation returns Channels.newChannel(OutputStream) with the result of WritableResource.getOutputStream().

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:

• WritableResource.getOutputStream()

createRelative

public Resource createRelative(String relativePath)
                        throws MalformedURLException

Description copied from class: UrlResource

This implementation creates a UrlResource, delegating to UrlResource.createRelativeURL(String) for adapting the relative path.

Specified by:

createRelative in interface Resource

Overrides:

createRelative in class UrlResource

Parameters:

relativePath - the relative path (relative to this resource)

Returns:

the resource handle for the relative resource

Throws:

MalformedURLException

See Also:

• UrlResource.createRelativeURL(String)