程序包 javax.tools

接口 FileObject

所有已知子接口:

JavaFileObject

所有已知实现类:

ForwardingFileObject, ForwardingJavaFileObject, SimpleJavaFileObject

public interface FileObject

File abstraction for tools. In this context, file means an abstraction of regular files and other sources of data. For example, a file object can be used to represent regular files, memory cache, or data in databases.

All methods in this interface might throw a SecurityException if a security exception occurs.

Unless explicitly allowed, all methods in this interface might throw a NullPointerException if given a null argument.

从以下版本开始:

1.6

方法概要

限定符和类型	方法	说明
boolean	delete()	Deletes this file object.
CharSequence	getCharContent(boolean ignoreEncodingErrors)	Gets the character content of this file object, if available.
long	getLastModified()	Gets the time this file object was last modified.
String	getName()	Gets a user-friendly name for this file object.
InputStream	openInputStream()	Gets an InputStream for this file object.
OutputStream	openOutputStream()	Gets an OutputStream for this file object.
Reader	openReader(boolean ignoreEncodingErrors)	Gets a reader for this object.
Writer	openWriter()	Gets a Writer for this file object.
URI	toUri()	Returns a URI identifying this file object.

方法详细资料

toUri

URI toUri()

Returns a URI identifying this file object.

返回:

a URI

getName

String getName()

Gets a user-friendly name for this file object. The exact value returned is not specified but implementations should take care to preserve names as given by the user. For example, if the user writes the filename "BobsApp\Test.java" on the command line, this method should return "BobsApp\Test.java" whereas the toUri method might return file:///C:/Documents%20and%20Settings/UncleBob/BobsApp/Test.java.

返回:

a user-friendly name

openInputStream

InputStream openInputStream()
                     throws IOException

Gets an InputStream for this file object.

返回:

an InputStream

抛出:

IllegalStateException - if this file object was opened for writing and does not support reading

UnsupportedOperationException - if this kind of file object does not support byte access

IOException - if an I/O error occurred

openOutputStream

OutputStream openOutputStream()
                       throws IOException

Gets an OutputStream for this file object.

返回:

an OutputStream

抛出:

IllegalStateException - if this file object was opened for reading and does not support writing

UnsupportedOperationException - if this kind of file object does not support byte access

IOException - if an I/O error occurred

openReader

Reader openReader(boolean ignoreEncodingErrors)
           throws IOException

Gets a reader for this object. The returned reader will replace bytes that cannot be decoded with the default translation character. In addition, the reader may report a diagnostic unless ignoreEncodingErrors is true.

参数:

ignoreEncodingErrors - ignore encoding errors if true

返回:

a Reader

抛出:

IllegalStateException - if this file object was opened for writing and does not support reading

UnsupportedOperationException - if this kind of file object does not support character access

IOException - if an I/O error occurred

getCharContent

CharSequence getCharContent(boolean ignoreEncodingErrors)
                     throws IOException

Gets the character content of this file object, if available. Any byte that cannot be decoded will be replaced by the default translation character. In addition, a diagnostic may be reported unless ignoreEncodingErrors is true.

参数:

ignoreEncodingErrors - ignore encoding errors if true

返回:

a CharSequence if available; null otherwise

抛出:

IllegalStateException - if this file object was opened for writing and does not support reading

UnsupportedOperationException - if this kind of file object does not support character access

IOException - if an I/O error occurred

openWriter

Writer openWriter()
           throws IOException

Gets a Writer for this file object.

返回:

a Writer

抛出:

IllegalStateException - if this file object was opened for reading and does not support writing

UnsupportedOperationException - if this kind of file object does not support character access

IOException - if an I/O error occurred

getLastModified

long getLastModified()

Gets the time this file object was last modified. The time is measured in milliseconds since the epoch (00:00:00 GMT, January 1, 1970).

返回:

the time this file object was last modified; or 0 if the file object does not exist, if an I/O error occurred, or if the operation is not supported

delete

boolean delete()

Deletes this file object. In case of errors, returns false.

返回:

true if and only if this file object is successfully deleted; false otherwise