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JavaTM 2 Platform Std. Ed. v1.3 |
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java.lang.Object
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+--java.io.OutputStream
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+--java.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.
File,
FileDescriptor,
FileInputStream| Constructor Summary | |
FileOutputStream(File file)
Creates a file output stream to write to the file represented by the specified File object. |
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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. |
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FileOutputStream(String name)
Creates an output file stream to write to the file with the specified name. |
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FileOutputStream(String name,
boolean append)
Creates an output file stream to write to the file with the specified name. |
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| Method Summary | |
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. |
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. |
| Methods inherited from class java.io.OutputStream |
flush |
| Methods inherited from class java.lang.Object |
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| 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 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 reasonSecurityException - if a security manager exists and its
checkWrite 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 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.SecurityException - if a security manager exists and its
checkWrite method denies write access
to the file.SecurityManager.checkWrite(java.lang.String)
public FileOutputStream(File file)
throws FileNotFoundException
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.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 reasonSecurityException - if a security manager exists and its
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.SecurityException - if a security manager exists and its
checkWrite method denies
write access to the file descriptor.SecurityManager.checkWrite(java.io.FileDescriptor)| Method Detail |
public void write(int b)
throws IOException
write method of OutputStream.write in class OutputStreamb - the byte to be written.IOException - if an I/O error occurs.
public void write(byte[] b)
throws IOException
b.length bytes from the specified byte array
to this file output stream.write in class OutputStreamb - the data.IOException - if an I/O error occurs.
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.write in class OutputStreamb - 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 IOException
close in class OutputStreamIOException - if an I/O error occurs.
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.IOException - if an I/O error occurs.FileDescriptor
protected void finalize()
throws IOException
close method of this file output stream is
called when there are no more references to this stream.finalize in class ObjectIOException - if an I/O error occurs.FileInputStream.close()
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JavaTM 2 Platform Std. Ed. v1.3 |
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