public class FileOutputStream
extends java.io.OutputStream
File
. 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
,
FileInputStream
Constructor and Description |
---|
FileOutputStream(File file)
Creates a file output stream to write to the file represented by
the specified
File object. |
FileOutputStream(File file,
boolean append)
Creates a file output stream to write to the file represented by
the specified
File object. |
FileOutputStream(java.lang.String name)
Creates a file output stream to write to the file with the
specified name.
|
FileOutputStream(java.lang.String name,
boolean append)
Creates a file output stream to write to the file with the specified
name.
|
Modifier and Type | Method and Description |
---|---|
void |
close()
Closes this file output stream and releases any system resources
associated with this stream.
|
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.
|
public FileOutputStream(java.lang.String name) throws FileNotFoundException
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 filenameFileNotFoundException
- 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 reasonjava.lang.SecurityException
- if a security manager exists and its
checkWrite
method denies write access
to the file.public FileOutputStream(java.lang.String name, boolean append) throws FileNotFoundException
true
, then
bytes will be written to the end of the file rather than the beginning.
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 beginningFileNotFoundException
- 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.java.lang.SecurityException
- if a security manager exists and its
checkWrite
method denies write access
to the file.public FileOutputStream(File file) throws FileNotFoundException
File
object.
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.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 reasonjava.lang.SecurityException
- if a security manager exists and its
checkWrite
method denies write access
to the file.File.getPath()
,
SecurityException
public FileOutputStream(File file, boolean append) throws FileNotFoundException
File
object. If the second argument is
true
, then bytes will be written to the end of the file
rather than the beginning.
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.append
- if true
, then bytes will be written
to the end of the file rather than the beginningFileNotFoundException
- 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 reasonjava.lang.SecurityException
- if a security manager exists and its
checkWrite
method denies write access
to the file.File.getPath()
,
SecurityException
public void write(int b) throws java.io.IOException
write
method of OutputStream
.write
in class java.io.OutputStream
b
- the byte to be written.IOException
- if an I/O error occurs.public void write(byte[] b) throws java.io.IOException
b.length
bytes from the specified byte array
to this file output stream.write
in class java.io.OutputStream
b
- the data.IOException
- if an I/O error occurs.public void write(byte[] b, int off, int len) throws java.io.IOException
len
bytes from the specified byte array
starting at offset off
to this file output stream.write
in class java.io.OutputStream
b
- the data.off
- the start offset in the data.len
- the number of bytes to write.IOException
- if an I/O error occurs.public void close() throws java.io.IOException
If this stream has an associated channel then the channel is closed as well.
close
in interface java.io.Closeable
close
in interface java.lang.AutoCloseable
close
in class java.io.OutputStream
IOException
- if an I/O error occurs.