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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object | +--java.io.OutputStream | +--java.io.FileOutputStream
A file output stream is an output stream for writing data to a
File
or to a FileDescriptor
. What files
are available or may be created depends on the host environment.
File
,
FileDescriptor
,
FileInputStream
Field Summary | |
private FileDescriptor |
fd
The system dependent file descriptor. |
Constructor Summary | |
FileOutputStream(File file)
Creates a file output stream to write to the file represented by the specified File object. |
|
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. |
|
FileOutputStream(String name)
Creates an output file stream to write to the file with the specified name. |
|
FileOutputStream(String name,
boolean append)
Creates an output file stream to write to the file with the specified name . |
Method Summary | |
(package private) static void |
|
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. |
FileDescriptor |
getFD()
Returns the file descriptor associated with this stream. |
private static void |
initIDs()
|
private void |
open(String name)
Opens a file, with the specified name, for writing. |
private void |
openAppend(String name)
Opens a file, with the specified name, for appending. |
void |
write(byte[] b)
Writes b.length bytes from the specified byte array
to this file output stream. |
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. |
void |
write(int b)
Writes the specified byte to this file output stream. |
private void |
writeBytes(byte[] b,
int off,
int len)
Writes a sub array as a sequence of bytes. |
Methods inherited from class java.io.OutputStream |
flush |
Methods inherited from class java.lang.Object |
clone,
equals,
getClass,
hashCode,
notify,
notifyAll,
registerNatives,
toString,
wait,
wait,
wait |
Field Detail |
private FileDescriptor fd
Constructor Detail |
public FileOutputStream(String name) throws FileNotFoundException
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 filenamecheckWrite
method denies write access
to the file.SecurityManager.checkWrite(java.lang.String)
public FileOutputStream(String name, boolean append) throws FileNotFoundException
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 nameappend
- if true
, then bytes will be written
to the end of the file rather than the beginningcheckWrite
method denies write access
to the file.SecurityManager.checkWrite(java.lang.String)
public FileOutputStream(File file) throws IOException
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.
file
- the file to be opened for writing.checkWrite
method denies write access
to the file.File.getPath()
,
SecurityException
,
SecurityManager.checkWrite(java.lang.String)
public FileOutputStream(FileDescriptor fdObj)
First, if there is a security manager, its checkWrite
method is called with the file descriptor fdObj
argument as its argument.
fdObj
- the file descriptor to be opened for writing.checkWrite
method denies
write access to the file descriptor.SecurityManager.checkWrite(java.io.FileDescriptor)
Method Detail |
private void open(String name) throws FileNotFoundException
name
- name of file to be openedprivate void openAppend(String name) throws FileNotFoundException
name
- name of file to be openedpublic void write(int b) throws IOException
write
method of OutputStream
.b
- the byte to be written.private void writeBytes(byte[] b, int off, int len) throws IOException
b
- the data to be writtenoff
- the start offset in the datalen
- the number of bytes that are writtenpublic void write(byte[] b) throws IOException
b.length
bytes from the specified byte array
to this file output stream.b
- the data.public void write(byte[] b, int off, int len) throws IOException
len
bytes from the specified byte array
starting at offset off
to this file output stream.b
- the data.off
- the start offset in the data.len
- the number of bytes to write.public void close() throws IOException
public final FileDescriptor getFD() throws IOException
FileDescriptor
object that represents
the connection to the file in the file system being used
by this FileOutputStream
object.FileDescriptor
protected void finalize() throws IOException
close
method of this file output stream is
called when there are no more references to this stream.FileInputStream.close()
private static void initIDs()
static void()
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