java.lang.Object
- org.springframework.core.io.AbstractResource

所有已实现的接口:
InputStreamSource, Resource
直接已知子类:
AbstractFileResolvingResource, ByteArrayResource, DescriptiveResource, FileSystemResource, InputStreamResource, PathResource, VfsResource
```
public abstract class AbstractResource
extends Object
implements Resource
```
Convenience base class for Resource implementations, pre-implementing typical behavior.
The "exists" method will check whether a File or InputStream can be opened; "isOpen" will always return false; "getURL" and "getFile" throw an exception; and "toString" will return the description.
从以下版本开始:
28.12.2003
作者:
Juergen Hoeller, Sam Brannen

构造器概要
构造器
构造器说明
AbstractResource()

方法概要

所有方法实例方法具体方法
修饰符和类型	方法	说明
`long`	`contentLength()`	This method reads the entire InputStream to determine the content length.
`Resource`	`createRelative(String relativePath)`	This implementation throws a FileNotFoundException, assuming that relative resources cannot be created for this resource.
`boolean`	`equals(Object other)`	This implementation compares description strings.
`boolean`	`exists()`	This implementation checks whether a File can be opened, falling back to whether an InputStream can be opened.
`File`	`getFile()`	This implementation throws a FileNotFoundException, assuming that the resource cannot be resolved to an absolute file path.
`protected File`	`getFileForLastModifiedCheck()`	Determine the File to use for timestamp checking.
`String`	`getFilename()`	This implementation always returns `null`, assuming that this resource type does not have a filename.
`URI`	`getURI()`	This implementation builds a URI based on the URL returned by `getURL()`.
`URL`	`getURL()`	This implementation throws a FileNotFoundException, assuming that the resource cannot be resolved to a URL.
`int`	`hashCode()`	This implementation returns the description's hash code.
`boolean`	`isFile()`	This implementation always returns `false`.
`boolean`	`isOpen()`	This implementation always returns `false`.
`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 `Channels.newChannel(InputStream)` with the result of `InputStreamSource.getInputStream()`.
`String`	`toString()`	This implementation returns the description of this resource.

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 org.springframework.core.io.InputStreamSource
getInputStream

从接口继承的方法 org.springframework.core.io.Resource
getDescription

- 构造器详细资料
  - AbstractResource
```
public AbstractResource()
```
- 方法详细资料
  - exists
```
public boolean exists()
```
    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
  - isReadable
```
public boolean isReadable()
```
    This implementation always returns true for a resource that exists (revised as of 5.1).
    指定者:
    isReadable 在接口中 Resource
    另请参阅:
    InputStreamSource.getInputStream(), Resource.exists()
  - isOpen
```
public boolean isOpen()
```
    This implementation always returns false.
    指定者:
    isOpen 在接口中 Resource
  - isFile
```
public boolean isFile()
```
    This implementation always returns false.
    指定者:
    isFile 在接口中 Resource
    另请参阅:
    Resource.getFile()
  - getURL
```
public URL getURL()
           throws IOException
```
    This implementation throws a FileNotFoundException, assuming that the resource cannot be resolved to a URL.
    指定者:
    getURL 在接口中 Resource
    抛出:
    IOException - if the resource cannot be resolved as URL, i.e. if the resource is not available as descriptor
  - getURI
```
public URI getURI()
           throws IOException
```
    This implementation builds a URI based on the URL returned by getURL().
    指定者:
    getURI 在接口中 Resource
    抛出:
    IOException - if the resource cannot be resolved as URI, i.e. if the resource is not available as descriptor
  - getFile
```
public File getFile()
             throws IOException
```
    This implementation throws a FileNotFoundException, assuming that the resource cannot be resolved to an absolute file path.
    指定者:
    getFile 在接口中 Resource
    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:
    InputStreamSource.getInputStream()
  - readableChannel
```
public ReadableByteChannel readableChannel()
                                    throws IOException
```
    This implementation returns Channels.newChannel(InputStream) with the result of InputStreamSource.getInputStream().
    This is the same as in Resource's corresponding default method but mirrored here for efficient JVM-level dispatching in a class hierarchy.
    指定者:
    readableChannel 在接口中 Resource
    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:
    InputStreamSource.getInputStream()
  - contentLength
```
public long contentLength()
                   throws IOException
```
    This method reads the entire InputStream to determine the content length.
    For a custom sub-class 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
    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
```
    This implementation checks the timestamp of the underlying File, if available.
    指定者:
    lastModified 在接口中 Resource
    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:
    getFileForLastModifiedCheck()
  - getFileForLastModifiedCheck
```
protected File getFileForLastModifiedCheck()
                                    throws IOException
```
    Determine the File to use for timestamp checking.
    The default implementation delegates to getFile().
    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
  - createRelative
```
public Resource createRelative(String relativePath)
                        throws IOException
```
    This implementation throws a FileNotFoundException, assuming that relative resources cannot be created for this resource.
    指定者:
    createRelative 在接口中 Resource
    参数:
    relativePath - the relative path (relative to this resource)
    返回:
    the resource handle for the relative resource
    抛出:
    IOException - if the relative resource cannot be determined
  - getFilename
```
@Nullable
public String getFilename()
```
    This implementation always returns null, assuming that this resource type does not have a filename.
    指定者:
    getFilename 在接口中 Resource
  - equals
```
public boolean equals(@Nullable
                      Object other)
```
    This implementation compares description strings.
    覆盖:
    equals 在类中 Object
    另请参阅:
    Resource.getDescription()
  - hashCode
```
public int hashCode()
```
    This implementation returns the description's hash code.
    覆盖:
    hashCode 在类中 Object
    另请参阅:
    Resource.getDescription()
  - toString
```
public String toString()
```
    This implementation returns the description of this resource.
    覆盖:
    toString 在类中 Object
    另请参阅:
    Resource.getDescription()

类 AbstractResource

构造器概要

方法概要

从类继承的方法 java.lang.Object

从接口继承的方法 org.springframework.core.io.InputStreamSource

从接口继承的方法 org.springframework.core.io.Resource

构造器详细资料

AbstractResource

方法详细资料

exists

isReadable

isOpen

isFile

getURL

getURI

getFile

readableChannel

contentLength

lastModified

getFileForLastModifiedCheck

createRelative

getFilename

equals

hashCode

toString