程序包 java.io

类 ByteArrayInputStream

java.lang.Object

java.io.InputStream

java.io.ByteArrayInputStream

所有已实现的接口:

Closeable, AutoCloseable

public class ByteArrayInputStream
extends InputStream

A ByteArrayInputStream contains an internal buffer that contains bytes that may be read from the stream. An internal counter keeps track of the next byte to be supplied by the read method.

Closing a ByteArrayInputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

从以下版本开始:

JDK1.0

另请参阅:

StringBufferInputStream

字段概要

字段

限定符和类型	字段	说明
protected byte[]	buf	An array of bytes that was provided by the creator of the stream.
protected int	count	The index one greater than the last valid character in the input stream buffer.
protected int	mark	The currently marked position in the stream.
protected int	pos	The index of the next character to read from the input stream buffer.

构造器概要

构造器

构造器	说明
ByteArrayInputStream(byte[] buf)	Creates a ByteArrayInputStream so that it uses buf as its buffer array.
ByteArrayInputStream(byte[] buf, int offset, int length)	Creates ByteArrayInputStream that uses buf as its buffer array.

方法概要

限定符和类型	方法	说明
int	available()	Returns the number of remaining bytes that can be read (or skipped over) from this input stream.
void	close()	Closing a ByteArrayInputStream has no effect.
void	mark(int readAheadLimit)	Set the current marked position in the stream.
boolean	markSupported()	Tests if this InputStream supports mark/reset.
int	read()	Reads the next byte of data from this input stream.
int	read(byte[] b, int off, int len)	Reads up to len bytes of data into an array of bytes from this input stream.
void	reset()	Resets the buffer to the marked position.
long	skip(long n)	Skips n bytes of input from this input stream.

从类继承的方法 java.io.InputStream

read

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

An array of bytes that was provided by the creator of the stream. Elements buf[0] through buf[count-1] are the only bytes that can ever be read from the stream; element buf[pos] is the next byte to be read.

count

protected int count

The index one greater than the last valid character in the input stream buffer. This value should always be nonnegative and not larger than the length of buf. It is one greater than the position of the last byte within buf that can ever be read from the input stream buffer.

mark

protected int mark

The currently marked position in the stream. ByteArrayInputStream objects are marked at position zero by default when constructed. They may be marked at another position within the buffer by the mark() method. The current buffer position is set to this point by the reset() method.

If no mark has been set, then the value of mark is the offset passed to the constructor (or 0 if the offset was not supplied).

从以下版本开始:

JDK1.1

pos

protected int pos

The index of the next character to read from the input stream buffer. This value should always be nonnegative and not larger than the value of count. The next byte to be read from the input stream buffer will be buf[pos].

构造器详细资料

ByteArrayInputStream

public ByteArrayInputStream(byte[] buf)

Creates a ByteArrayInputStream so that it uses buf as its buffer array. The buffer array is not copied. The initial value of pos is 0 and the initial value of count is the length of buf.

参数:

buf - the input buffer.

ByteArrayInputStream

public ByteArrayInputStream(byte[] buf,
                            int offset,
                            int length)

Creates ByteArrayInputStream that uses buf as its buffer array. The initial value of pos is offset and the initial value of count is the minimum of offset+length and buf.length. The buffer array is not copied. The buffer's mark is set to the specified offset.

参数:

buf - the input buffer.

offset - the offset in the buffer of the first byte to read.

length - the maximum number of bytes to read from the buffer.

方法详细资料

read

public int read()

Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned.

This read method cannot block.

指定者:

read 在类中 InputStream

返回:

the next byte of data, or -1 if the end of the stream has been reached.

read

public int read(byte[] b,
                int off,
                int len)

Reads up to len bytes of data into an array of bytes from this input stream. If pos equals count, then -1 is returned to indicate end of file. Otherwise, the number k of bytes read is equal to the smaller of len and count-pos. If k is positive, then bytes buf[pos] through buf[pos+k-1] are copied into b[off] through b[off+k-1] in the manner performed by System.arraycopy. The value k is added into pos and k is returned.

This read method cannot block.

覆盖:

read 在类中 InputStream

参数:

b - the buffer into which the data is read.

off - the start offset in the destination array b

len - the maximum number of bytes read.

返回:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

抛出:

NullPointerException - If b is null.

IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off

另请参阅:

InputStream.read()

skip

public long skip(long n)

Skips n bytes of input from this input stream. Fewer bytes might be skipped if the end of the input stream is reached. The actual number k of bytes to be skipped is equal to the smaller of n and count-pos. The value k is added into pos and k is returned.

覆盖:

skip 在类中 InputStream

参数:

n - the number of bytes to be skipped.

返回:

the actual number of bytes skipped.

available

public int available()

Returns the number of remaining bytes that can be read (or skipped over) from this input stream.

The value returned is count - pos, which is the number of bytes remaining to be read from the input buffer.

覆盖:

available 在类中 InputStream

返回:

the number of remaining bytes that can be read (or skipped over) from this input stream without blocking.

markSupported

public boolean markSupported()

Tests if this InputStream supports mark/reset. The markSupported method of ByteArrayInputStream always returns true.

覆盖:

markSupported 在类中 InputStream

返回:

true if this stream instance supports the mark and reset methods; false otherwise.

从以下版本开始:

JDK1.1

另请参阅:

InputStream.mark(int), InputStream.reset()

mark

public void mark(int readAheadLimit)

Set the current marked position in the stream. ByteArrayInputStream objects are marked at position zero by default when constructed. They may be marked at another position within the buffer by this method.

If no mark has been set, then the value of the mark is the offset passed to the constructor (or 0 if the offset was not supplied).

Note: The readAheadLimit for this class has no meaning.

覆盖:

mark 在类中 InputStream

参数:

readAheadLimit - the maximum limit of bytes that can be read before the mark position becomes invalid.

从以下版本开始:

JDK1.1

另请参阅:

InputStream.reset()

reset

public void reset()

Resets the buffer to the marked position. The marked position is 0 unless another position was marked or an offset was specified in the constructor.

覆盖:

reset 在类中 InputStream

另请参阅:

InputStream.mark(int), IOException

close

public void close()
           throws IOException

Closing a ByteArrayInputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

指定者:

close 在接口中 AutoCloseable

指定者:

close 在接口中 Closeable

覆盖:

close 在类中 InputStream

抛出:

IOException - if an I/O error occurs.