程序包 java.io

类 FilterOutputStream

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

所有已实现的接口:

Closeable, Flushable, AutoCloseable

直接已知子类:

BufferedOutputStream, CheckedOutputStream, CipherOutputStream, DataOutputStream, DeflaterOutputStream, DigestOutputStream, InflaterOutputStream, PrintStream

public class FilterOutputStream
extends OutputStream

This class is the superclass of all classes that filter output streams. These streams sit on top of an already existing output stream (the underlying output stream) which it uses as its basic sink of data, but possibly transforming the data along the way or providing additional functionality.

The class FilterOutputStream itself simply overrides all methods of OutputStream with versions that pass all requests to the underlying output stream. Subclasses of FilterOutputStream may further override some of these methods as well as provide additional methods and fields.

从以下版本开始:

JDK1.0

字段概要

字段

限定符和类型	字段	说明
protected OutputStream	out	The underlying output stream to be filtered.

构造器概要

构造器

构造器	说明
FilterOutputStream(OutputStream out)	Creates an output stream filter built on top of the specified underlying output stream.

方法概要

限定符和类型	方法	说明
void	close()	Closes this output stream and releases any system resources associated with the stream.
void	flush()	Flushes this output stream and forces any buffered output bytes to be written out to the stream.
void	write(byte[] b)	Writes b.length bytes to this output stream.
void	write(byte[] b, int off, int len)	Writes len bytes from the specified byte array starting at offset off to this output stream.
void	write(int b)	Writes the specified byte to this output stream.

从类继承的方法 java.lang.Object

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

字段详细资料

out

protected OutputStream out

The underlying output stream to be filtered.

构造器详细资料

FilterOutputStream

public FilterOutputStream(OutputStream out)

Creates an output stream filter built on top of the specified underlying output stream.

参数:

out - the underlying output stream to be assigned to the field this.out for later use, or null if this instance is to be created without an underlying stream.

方法详细资料

write

public void write(int b)
           throws IOException

Writes the specified byte to this output stream.

The write method of FilterOutputStream calls the write method of its underlying output stream, that is, it performs out.write(b).

Implements the abstract write method of OutputStream.

指定者:

write 在类中 OutputStream

参数:

b - the byte.

抛出:

IOException - if an I/O error occurs.

write

public void write(byte[] b)
           throws IOException

Writes b.length bytes to this output stream.

The write method of FilterOutputStream calls its write method of three arguments with the arguments b, 0, and b.length.

Note that this method does not call the one-argument write method of its underlying stream with the single argument b.

覆盖:

write 在类中 OutputStream

参数:

b - the data to be written.

抛出:

IOException - if an I/O error occurs.

另请参阅:

write(byte[], int, int)

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 output stream.

The write method of FilterOutputStream calls the write method of one argument on each byte to output.

Note that this method does not call the write method of its underlying input stream with the same arguments. Subclasses of FilterOutputStream should provide a more efficient implementation of this method.

覆盖:

write 在类中 OutputStream

参数:

b - the data.

off - the start offset in the data.

len - the number of bytes to write.

抛出:

IOException - if an I/O error occurs.

另请参阅:

write(int)

flush

public void flush()
           throws IOException

Flushes this output stream and forces any buffered output bytes to be written out to the stream.

The flush method of FilterOutputStream calls the flush method of its underlying output stream.

指定者:

flush 在接口中 Flushable

覆盖:

flush 在类中 OutputStream

抛出:

IOException - if an I/O error occurs.

另请参阅:

out

close

public void close()
           throws IOException

Closes this output stream and releases any system resources associated with the stream.

The close method of FilterOutputStream calls its flush method, and then calls the close method of its underlying output stream.

指定者:

close 在接口中 AutoCloseable

指定者:

close 在接口中 Closeable

覆盖:

close 在类中 OutputStream

抛出:

IOException - if an I/O error occurs.

另请参阅:

flush(), out