程序包 java.io

类 BufferedOutputStream

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

java.io.BufferedOutputStream

所有已实现的接口:

Closeable, Flushable, AutoCloseable

public class BufferedOutputStream
extends FilterOutputStream

The class implements a buffered output stream. By setting up such an output stream, an application can write bytes to the underlying output stream without necessarily causing a call to the underlying system for each byte written.

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 byte[]	buf	The internal buffer where data is stored.
protected int	count	The number of valid bytes in the buffer.

从类继承的字段 java.io.FilterOutputStream

out

构造器概要

构造器

构造器	说明
BufferedOutputStream(OutputStream out)	Creates a new buffered output stream to write data to the specified underlying output stream.
BufferedOutputStream(OutputStream out, int size)	Creates a new buffered output stream to write data to the specified underlying output stream with the specified buffer size.

方法概要

限定符和类型	方法	说明
void	flush()	Flushes this buffered output stream.
void	write(byte[] b, int off, int len)	Writes len bytes from the specified byte array starting at offset off to this buffered output stream.
void	write(int b)	Writes the specified byte to this buffered output stream.

从类继承的方法 java.io.FilterOutputStream

close, write

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

buf

protected byte[] buf

The internal buffer where data is stored.

count

protected int count

The number of valid bytes in the buffer. This value is always in the range 0 through buf.length; elements buf[0] through buf[count-1] contain valid byte data.

构造器详细资料

BufferedOutputStream

public BufferedOutputStream(OutputStream out)

Creates a new buffered output stream to write data to the specified underlying output stream.

参数:

out - the underlying output stream.

BufferedOutputStream

public BufferedOutputStream(OutputStream out,
                            int size)

Creates a new buffered output stream to write data to the specified underlying output stream with the specified buffer size.

参数:

out - the underlying output stream.

size - the buffer size.

抛出:

IllegalArgumentException - if size <= 0.

方法详细资料

write

public void write(int b)
           throws IOException

Writes the specified byte to this buffered output stream.

覆盖:

write 在类中 FilterOutputStream

参数:

b - the byte to be written.

抛出:

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 buffered output stream.

Ordinarily this method stores bytes from the given array into this stream's buffer, flushing the buffer to the underlying output stream as needed. If the requested length is at least as large as this stream's buffer, however, then this method will flush the buffer and write the bytes directly to the underlying output stream. Thus redundant BufferedOutputStreams will not copy data unnecessarily.

覆盖:

write 在类中 FilterOutputStream

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:

FilterOutputStream.write(int)

flush

public void flush()
           throws IOException

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

指定者:

flush 在接口中 Flushable

覆盖:

flush 在类中 FilterOutputStream

抛出:

IOException - if an I/O error occurs.

另请参阅:

FilterOutputStream.out