程序包 cn.taketoday.core.io

类 AbstractFileResolvingResource

java.lang.Object

cn.taketoday.core.io.AbstractResource

cn.taketoday.core.io.AbstractFileResolvingResource

所有已实现的接口:

InputStreamSource, Resource

直接已知子类:

ClassPathResource, UrlResource

public abstract class AbstractFileResolvingResource
extends AbstractResource

Abstract base class for resources which resolve URLs into File references, such as UrlResource or ClassPathResource.

Detects the "file" protocol as well as the JBoss "vfs" protocol in URLs, resolving file system references accordingly.

从以下版本开始:

4.0 2022/2/20 16:28

作者:

Juergen Hoeller, Harry Yang

字段概要

从接口继承的字段 cn.taketoday.core.io.Resource

EMPTY_ARRAY

构造器概要

构造器

构造器	说明
AbstractFileResolvingResource()

方法概要

修饰符和类型	方法	说明
(专用程序包) boolean	checkReadable(URL url)
long	contentLength()	This method reads the entire InputStream to determine the content length.
protected void	customizeConnection(HttpURLConnection con)	Customize the given HttpURLConnection before fetching the resource.
protected void	customizeConnection(URLConnection con)	Customize the given URLConnection before fetching the resource.
boolean	exists()	This implementation checks whether a File can be opened, falling back to whether an InputStream can be opened.
File	getFile()	This implementation returns a File reference for the underlying class path resource, provided that it refers to a file in the file system.
protected File	getFile(URI uri)	This implementation returns a File reference for the given URI-identified resource, provided that it refers to a file in the file system.
protected File	getFileForLastModifiedCheck()	This implementation determines the underlying File (or jar file, in case of a resource in a jar/zip).
boolean	isFile()	This implementation always returns false.
protected boolean	isFile(URI uri)	Determine whether the given URI represents a file in a file system.
boolean	isReadable()	This implementation always returns true for a resource that exists (revised as of 5.1).
long	lastModified()	This implementation checks the timestamp of the underlying File, if available.
ReadableByteChannel	readableChannel()	This implementation returns a FileChannel for the given URI-identified resource, provided that it refers to a file in the file system.

从类继承的方法 cn.taketoday.core.io.AbstractResource

createRelative, equals, getName, getURI, getURL, hashCode, isDirectory, isOpen, list, list, toString

从类继承的方法 java.lang.Object

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

从接口继承的方法 cn.taketoday.core.io.InputStreamSource

getInputStream, getReader, getReader

从接口继承的方法 cn.taketoday.core.io.Resource

getContentAsByteArray, getContentAsString

构造器详细资料

AbstractFileResolvingResource

public AbstractFileResolvingResource()

方法详细资料

exists

public boolean exists()

从类复制的说明: AbstractResource

This implementation checks whether a File can be opened, falling back to whether an InputStream can be opened.

This will cover both directories and content resources.

指定者:

exists 在接口中 Resource

覆盖:

exists 在类中 AbstractResource

isReadable

public boolean isReadable()

从类复制的说明: AbstractResource

This implementation always returns true for a resource that exists (revised as of 5.1).

指定者:

isReadable 在接口中 Resource

覆盖:

isReadable 在类中 AbstractResource

另请参阅:

• InputStreamSource.getInputStream()
• Resource.exists()

checkReadable

boolean checkReadable(URL url)

isFile

public boolean isFile()

从类复制的说明: AbstractResource

This implementation always returns false.

指定者:

isFile 在接口中 Resource

覆盖:

isFile 在类中 AbstractResource

另请参阅:

• Resource.getFile()

getFile

public File getFile()
             throws IOException

This implementation returns a File reference for the underlying class path resource, provided that it refers to a file in the file system.

指定者:

getFile 在接口中 Resource

覆盖:

getFile 在类中 AbstractResource

抛出:

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

另请参阅:

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

getFileForLastModifiedCheck

protected File getFileForLastModifiedCheck()
                                    throws IOException

This implementation determines the underlying File (or jar file, in case of a resource in a jar/zip).

覆盖:

getFileForLastModifiedCheck 在类中 AbstractResource

返回:

the File to use for timestamp checking (never null)

抛出:

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

IOException - in case of general resolution/reading failures

isFile

protected boolean isFile(URI uri)

Determine whether the given URI represents a file in a file system.

另请参阅:

• getFile(URI)

getFile

protected File getFile(URI uri)
                throws IOException

This implementation returns a File reference for the given URI-identified resource, provided that it refers to a file in the file system.

抛出:

IOException

另请参阅:

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

readableChannel

public ReadableByteChannel readableChannel()
                                    throws IOException

This implementation returns a FileChannel for the given URI-identified resource, provided that it refers to a file in the file system.

返回:

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

抛出:

FileNotFoundException - if the underlying resource doesn't exist

IOException - if the content channel could not be opened

另请参阅:

• getFile()

contentLength

public long contentLength()
                   throws IOException

从类复制的说明: AbstractResource

This method reads the entire InputStream to determine the content length.

For a custom subclass of InputStreamResource, we strongly recommend overriding this method with a more optimal implementation, e.g. checking File length, or possibly simply returning -1 if the stream can only be read once.

指定者:

contentLength 在接口中 Resource

覆盖:

contentLength 在类中 AbstractResource

抛出:

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

另请参阅:

• InputStreamSource.getInputStream()

lastModified

public long lastModified()
                  throws IOException

从类复制的说明: AbstractResource

This implementation checks the timestamp of the underlying File, if available.

指定者:

lastModified 在接口中 Resource

覆盖:

lastModified 在类中 AbstractResource

抛出:

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

另请参阅:

• AbstractResource.getFileForLastModifiedCheck()

customizeConnection

protected void customizeConnection(URLConnection con)
                            throws IOException

Customize the given URLConnection before fetching the resource.

Calls ResourceUtils.useCachesIfNecessary(URLConnection) and delegates to customizeConnection(HttpURLConnection) if possible. Can be overridden in subclasses.

覆盖:

customizeConnection 在类中 AbstractResource

参数:

con - the URLConnection to customize

抛出:

IOException - if thrown from URLConnection methods

customizeConnection

protected void customizeConnection(HttpURLConnection con)
                            throws IOException

Customize the given HttpURLConnection before fetching the resource.

Can be overridden in subclasses for configuring request headers and timeouts.

覆盖:

customizeConnection 在类中 AbstractResource

参数:

con - the HttpURLConnection to customize

抛出:

IOException - if thrown from HttpURLConnection methods