Java 2 Platform SE v1.3.1: Class FileOutputStream - JDK 5 Documentation v1.3.1, Java 2 SDK 英文文档

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java.io
Class FileOutputStream

java.lang.Object
  |
  +--java.io.OutputStream
        |
        +--java.io.FileOutputStream

public class FileOutputStream
extends OutputStream

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.

Since:: JDK1.0
See Also:: File, FileDescriptor, FileInputStream

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

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

FileOutputStream

public FileOutputStream(String name)
                 throws FileNotFoundException

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
Throws:: 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; SecurityException - if a security manager exists and its checkWrite method denies write access to the file.
See Also:: SecurityManager.checkWrite(java.lang.String)

FileOutputStream

public FileOutputStream(String name,
                        boolean append)
                 throws FileNotFoundException

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; append - if true, then bytes will be written to the end of the file rather than the beginning
Throws:: 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.; SecurityException - if a security manager exists and its checkWrite method denies write access to the file.
Since:: JDK1.1
See Also:: SecurityManager.checkWrite(java.lang.String)

FileOutputStream

public FileOutputStream(File file)
                 throws FileNotFoundException

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.
Throws:: 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; SecurityException - if a security manager exists and its checkWrite method denies write access to the file.
See Also:: File.getPath(), SecurityException, SecurityManager.checkWrite(java.lang.String)

FileOutputStream

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.

Parameters:: fdObj - the file descriptor to be opened for writing.
Throws:: SecurityException - if a security manager exists and its checkWrite method denies write access to the file descriptor.
See Also:: SecurityManager.checkWrite(java.io.FileDescriptor)

Method Detail

write

public void write(int b)
           throws IOException

Writes the specified byte to this file output stream. Implements the write method of OutputStream.

Overrides:: write in class OutputStream

Parameters:: b - the byte to be written.
Throws:: IOException - if an I/O error occurs.

write

public void write(byte[] b)
           throws IOException

Writes b.length bytes from the specified byte array to this file output stream.

Overrides:: write in class OutputStream

Parameters:: b - the data.
Throws:: IOException - if an I/O error occurs.

write

public void write(byte[] b,
                  int off,
                  int len)
           throws IOException

Writes len bytes from the specified byte array starting at offset off to this file output stream.

Overrides:: write in class OutputStream

Parameters:: b - the data.; off - the start offset in the data.; len - the number of bytes to write.
Throws:: IOException - if an I/O error occurs.

close

public void close()
           throws IOException

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.

Overrides:: close in class OutputStream

Throws:: IOException - if an I/O error occurs.

getFD

public final FileDescriptor getFD()
                           throws IOException

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.
Throws:: IOException - if an I/O error occurs.
See Also:: FileDescriptor

finalize

protected void finalize()
                 throws IOException

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.

Overrides:: finalize in class Object

Throws:: IOException - if an I/O error occurs.
See Also:: FileInputStream.close()

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Java, Java 2D, and JDBC are trademarks or registered trademarks of Sun Microsystems, Inc. in the US and other countries.
Copyright 1993-2001 Sun Microsystems, Inc. 901 San Antonio Road
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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
`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.

Java 2 Platform SE v1.3.1: Class FileOutputStream - JDK 5 Documentation v1.3.1, Java 2 SDK 英文文档

java.io Class FileOutputStream

FileOutputStream

FileOutputStream

FileOutputStream

FileOutputStream

write

write

write

close

getFD

finalize

java.io
Class FileOutputStream