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| java.lang.Object
 java.io.OutputStream
java.io.FileOutputStream
| FileOutputStream | | public class FileOutputStream extends OutputStream (Code) | | A file output stream is an output stream for writing data to a
File or to a FileDescriptor. Whether or not
a file is available or may be created depends upon the underlying
platform. Some platforms, in particular, allow a file to be opened
for writing by only one FileOutputStream (or other
file-writing object) at a time. In such situations the constructors in
this class will fail if the file involved is already open.
FileOutputStream is meant for writing streams of raw bytes
such as image data. For writing streams of characters, consider using
FileWriter.
author:
Arthur van Hoff
version:
1.68, 06/13/07
See Also: java.io.File
See Also: java.io.FileDescriptor
See Also: java.io.FileInputStream
since:
JDK1.0
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| Constructor Summary | |
| public | FileOutputStream(String name)
Creates an output file stream to write to the file with the
specified name. | | public | FileOutputStream(String name, boolean append)
Creates an output file stream to write to the file with the specified
name. | | public | FileOutputStream(File file)
Creates a file output stream to write to the file represented by
the specified File object. | | public | FileOutputStream(File file, boolean append)
Creates a file output stream to write to the file represented by
the specified File object. | | public | FileOutputStream(FileDescriptor fdObj)
Creates an output file stream to write to the specified file
descriptor, which represents an existing connection to an actual
file in the file system.
First, if there is a security manager, its checkWrite
method is called with the file descriptor fdObj
argument as its argument.
If fdObj is null then a NullPointerException
is thrown.
This constructor does not throw an exception if fdObj
is {link java.io.FileDescriptor#valid() invalid}.
However, if the methods are invoked on the resulting stream to attempt
I/O on the stream, an IOException is thrown. |
| Method Summary | |
| public void | close()
Closes this file output stream and releases any system resources
associated with this stream. | | protected void | finalize()
Cleans up the connection to the file, and ensures that the
close method of this file output stream is
called when there are no more references to this stream. | | public FileChannel | getChannel()
Returns the unique
java.nio.channels.FileChannel FileChannel object associated with this file output stream. | | final public FileDescriptor | getFD()
Returns the file descriptor associated with this stream.
the FileDescriptor object that represents the connection to the file in the file system being used by this FileOutputStream object. | | native public void | write(int b)
Writes the specified byte to this file output stream. | | public void | write(byte b)
Writes b.length bytes from the specified byte array
to this file output stream. | | public void | write(byte b, int off, int len)
Writes len bytes from the specified byte array
starting at offset off to this file output stream. |
| FileOutputStream | | public FileOutputStream(String name) throws FileNotFoundException(Code) | | Creates an output file stream to write to the file with the
specified name. A new FileDescriptor object is
created to represent this file connection.
First, if there is a security manager, its checkWrite
method is called with name as its argument.
If the file exists but is a directory rather than a regular file, does
not exist but cannot be created, or cannot be opened for any other
reason then a FileNotFoundException is thrown.
Parameters:
name - the system-dependent filename
exception:
FileNotFoundException - if the file exists but is a directoryrather than a regular file, does not exist but cannotbe created, or cannot be opened for any other reason
exception:
SecurityException - if a security manager exists and itscheckWrite method denies write accessto the file.
See Also: java.lang.SecurityManager.checkWrite(java.lang.String) |
| FileOutputStream | | public FileOutputStream(String name, boolean append) throws FileNotFoundException(Code) | | Creates an output file stream to write to the file with the specified
name. If the second argument is true, then
bytes will be written to the end of the file rather than the beginning.
A new FileDescriptor object is created to represent this
file connection.
First, if there is a security manager, its checkWrite
method is called with name as its argument.
If the file exists but is a directory rather than a regular file, does
not exist but cannot be created, or cannot be opened for any other
reason then a FileNotFoundException is thrown.
Parameters:
name - the system-dependent file name
Parameters:
append - if true, then bytes will be writtento the end of the file rather than the beginning
exception:
FileNotFoundException - if the file exists but is a directoryrather than a regular file, does not exist but cannotbe created, or cannot be opened for any other reason.
exception:
SecurityException - if a security manager exists and itscheckWrite method denies write accessto the file.
See Also: java.lang.SecurityManager.checkWrite(java.lang.String)
since:
JDK1.1 |
| FileOutputStream | | public FileOutputStream(File file) throws FileNotFoundException(Code) | | Creates a file output stream to write to the file represented by
the specified File object. A new
FileDescriptor object is created to represent this
file connection.
First, if there is a security manager, its checkWrite
method is called with the path represented by the file
argument as its argument.
If the file exists but is a directory rather than a regular file, does
not exist but cannot be created, or cannot be opened for any other
reason then a FileNotFoundException is thrown.
Parameters:
file - the file to be opened for writing.
exception:
FileNotFoundException - if the file exists but is a directoryrather than a regular file, does not exist but cannotbe created, or cannot be opened for any other reason
exception:
SecurityException - if a security manager exists and itscheckWrite method denies write accessto the file.
See Also: java.io.File.getPath
See Also: java.lang.SecurityException
See Also: java.lang.SecurityManager.checkWrite(java.lang.String) |
| FileOutputStream | | public FileOutputStream(File file, boolean append) throws FileNotFoundException(Code) | | Creates a file output stream to write to the file represented by
the specified File object. If the second argument is
true, then bytes will be written to the end of the file
rather than the beginning. A new FileDescriptor object is
created to represent this file connection.
First, if there is a security manager, its checkWrite
method is called with the path represented by the file
argument as its argument.
If the file exists but is a directory rather than a regular file, does
not exist but cannot be created, or cannot be opened for any other
reason then a FileNotFoundException is thrown.
Parameters:
file - the file to be opened for writing.
Parameters:
append - if true, then bytes will be writtento the end of the file rather than the beginning
exception:
FileNotFoundException - if the file exists but is a directoryrather than a regular file, does not exist but cannotbe created, or cannot be opened for any other reason
exception:
SecurityException - if a security manager exists and itscheckWrite method denies write accessto the file.
See Also: java.io.File.getPath
See Also: java.lang.SecurityException
See Also: java.lang.SecurityManager.checkWrite(java.lang.String)
since:
1.4 |
| FileOutputStream | | public FileOutputStream(FileDescriptor fdObj)(Code) | | Creates an output file stream to write to the specified file
descriptor, which represents an existing connection to an actual
file in the file system.
First, if there is a security manager, its checkWrite
method is called with the file descriptor fdObj
argument as its argument.
If fdObj is null then a NullPointerException
is thrown.
This constructor does not throw an exception if fdObj
is {link java.io.FileDescriptor#valid() invalid}.
However, if the methods are invoked on the resulting stream to attempt
I/O on the stream, an IOException is thrown.
Parameters:
fdObj - the file descriptor to be opened for writing
exception:
SecurityException - if a security manager exists and itscheckWrite method denieswrite access to the file descriptor
See Also: java.lang.SecurityManager.checkWrite(java.io.FileDescriptor) |
| close | | public void close() throws IOException(Code) | | Closes this file output stream and releases any system resources
associated with this stream. This file output stream may no longer
be used for writing bytes.
If this stream has an associated channel then the channel is closed
as well.
exception:
IOException - if an I/O error occurs. |
| finalize | | protected void finalize() throws IOException(Code) | | Cleans up the connection to the file, and ensures that the
close method of this file output stream is
called when there are no more references to this stream.
exception:
IOException - if an I/O error occurs.
See Also: java.io.FileInputStream.close |
| getChannel | | public FileChannel getChannel()(Code) | | Returns the unique
java.nio.channels.FileChannel FileChannel object associated with this file output stream.
The initial
java.nio.channels.FileChannel.positionposition of the returned channel will be equal to the
number of bytes written to the file so far unless this stream is in
append mode, in which case it will be equal to the size of the file.
Writing bytes to this stream will increment the channel's position
accordingly. Changing the channel's position, either explicitly or by
writing, will change this stream's file position.
the file channel associated with this file output stream
since:
1.4 |
| getFD | | final public FileDescriptor getFD() throws IOException(Code) | | Returns the file descriptor associated with this stream.
the FileDescriptor object that represents the connection to the file in the file system being used by this FileOutputStream object.
exception:
IOException - if an I/O error occurs.
See Also: java.io.FileDescriptor |
| write | | native public void write(int b) throws IOException(Code) | | Writes the specified byte to this file output stream. Implements
the write method of OutputStream.
Parameters:
b - the byte to be written.
exception:
IOException - if an I/O error occurs. |
| write | | public void write(byte b) throws IOException(Code) | | Writes b.length bytes from the specified byte array
to this file output stream.
Parameters:
b - the data.
exception:
IOException - if an I/O error occurs. |
| write | | public void write(byte b, int off, int len) throws IOException(Code) | | Writes len bytes from the specified byte array
starting at offset off to this file output stream.
Parameters:
b - the data.
Parameters:
off - the start offset in the data.
Parameters:
len - the number of bytes to write.
exception:
IOException - if an I/O error occurs. |
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