程序包 java.io

类 FileWriter

java.lang.Object

java.io.Writer

java.io.OutputStreamWriter

java.io.FileWriter

所有已实现的接口:

Closeable, Flushable, Appendable, AutoCloseable

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.

从以下版本开始:

JDK1.1

另请参阅:

OutputStreamWriter, FileOutputStream

字段概要

从类继承的字段 java.io.Writer

lock

构造器概要

构造器

构造器	说明
FileWriter(File file)	Constructs a FileWriter object given a File object.
FileWriter(FileDescriptor fd)	Constructs a FileWriter object associated with a file descriptor.
FileWriter(File file, boolean append)	Constructs a FileWriter object given a File object.
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.

方法概要

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从类继承的方法 java.io.OutputStreamWriter

close, flush, getEncoding, write, write, write

从类继承的方法 java.io.Writer

append, append, append, write, write

构造器详细资料

FileWriter

public FileWriter(String fileName)
           throws IOException

Constructs a FileWriter object given a file name.

参数:

fileName - String The system-dependent filename.

抛出:

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

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.

参数:

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.

抛出:

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

FileWriter

public FileWriter(File file)
           throws IOException

Constructs a FileWriter object given a File object.

参数:

file - a File object to write to.

抛出:

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

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.

参数:

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

抛出:

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

从以下版本开始:

1.4

FileWriter

public FileWriter(FileDescriptor fd)

Constructs a FileWriter object associated with a file descriptor.

参数:

fd - FileDescriptor object to write to.