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FileWriter (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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java.io
Class FileWriter

java.lang.Object
  java.io.Writer
      java.io.OutputStreamWriter
          java.io.FileWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable

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public class FileWriter
extends OutputStreamWriter

Convenience class for writing character files. The constructors of this class assume that the default character encoding and the default byte-buffer size are acceptable. To specify these values yourself, construct an OutputStreamWriter on a FileOutputStream.

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 FileWriter (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.

FileWriter is meant for writing streams of characters. For writing streams of raw bytes, consider using a FileOutputStream.

Since:

JDK1.1

See Also:

OutputStreamWriter, FileOutputStream

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Field Summary

 

Fields inherited from class java.io.Writer
lock

 

Constructor Summary
FileWriter(File file)           Constructs a FileWriter object given a File object.
FileWriter(File file, boolean append)           Constructs a FileWriter object given a File object.
FileWriter(FileDescriptor fd)           Constructs a FileWriter object associated with a file descriptor.
FileWriter(String fileName)           Constructs a FileWriter object given a file name.
FileWriter(String fileName, boolean append)           Constructs a FileWriter object given a file name with a boolean indicating whether or not to append the data written.

 

Method Summary

 

Methods inherited from class java.io.OutputStreamWriter
close, flush, getEncoding, write, write, write

 

Methods inherited from class java.io.Writer
append, append, append, write, write

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

FileWriter

public FileWriter(String fileName)
           throws IOException

Constructs a FileWriter object given a file name.

Parameters:

fileName - String The system-dependent filename.

Throws:

IOException - if the named 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

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FileWriter

public FileWriter(String fileName,
                  boolean append)
           throws IOException

Constructs a FileWriter object given a file name with a boolean indicating whether or not to append the data written.

Parameters:

fileName - String The system-dependent filename.

append - boolean if true, then data will be written to the end of the file rather than the beginning.

Throws:

IOException - if the named 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

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FileWriter

public FileWriter(File file)
           throws IOException

Constructs a FileWriter object given a File object.

Parameters:

file - a File object to write to.

Throws:

IOException - 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

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FileWriter

public FileWriter(File file,
                  boolean append)
           throws IOException

Constructs a FileWriter object given a File object. If the second argument is true, then bytes will be written to the end of the file rather than the beginning.

Parameters:

file - a File object to write to

append - if true, then bytes will be written to the end of the file rather than the beginning

Throws:

IOException - 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

Since:

1.4

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FileWriter

public FileWriter(FileDescriptor fd)

Constructs a FileWriter object associated with a file descriptor.

Parameters:

fd - FileDescriptor object to write to.

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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.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.