jdk.io.FileOutputStream
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.
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.
->file-output-streamclj
(->file-output-stream name)(->file-output-stream name append)Constructor.
Creates a file output 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.
name - the system-dependent file name - java.lang.String
append - if true, then bytes will be written to the end of the file rather than the beginning - boolean
throws: java.io.FileNotFoundException - 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.
Constructor. Creates a file output 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. name - the system-dependent file name - `java.lang.String` append - if true, then bytes will be written to the end of the file rather than the beginning - `boolean` throws: java.io.FileNotFoundException - 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.
closeclj
(close this)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.
throws: java.io.IOException - if an I/O error occurs.
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. throws: java.io.IOException - if an I/O error occurs.
get-channelclj
(get-channel this)Returns the unique FileChannel object associated with this file output stream.
The initial position 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.
returns: the file channel associated with this file output stream - java.nio.channels.FileChannel
Returns the unique FileChannel object associated with this file output stream. The initial position 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. returns: the file channel associated with this file output stream - `java.nio.channels.FileChannel`
get-fdclj
(get-fd this)Returns the file descriptor associated with this stream.
returns: the FileDescriptor object that represents
the connection to the file in the file system being used
by this FileOutputStream object. - java.io.FileDescriptor
throws: java.io.IOException - if an I/O error occurs.
Returns the file descriptor associated with this stream.
returns: the FileDescriptor object that represents
the connection to the file in the file system being used
by this FileOutputStream object. - `java.io.FileDescriptor`
throws: java.io.IOException - if an I/O error occurs.writeclj
(write this b)(write this b off len)Writes len bytes from the specified byte array starting at offset off to this file output stream.
b - the data. - byte[]
off - the start offset in the data. - int
len - the number of bytes to write. - int
throws: java.io.IOException - if an I/O error occurs.
Writes len bytes from the specified byte array starting at offset off to this file output stream. b - the data. - `byte[]` off - the start offset in the data. - `int` len - the number of bytes to write. - `int` throws: java.io.IOException - if an I/O error occurs.
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