javax.mail.internet
接口 SharedInputStream

所有已知实现类：

SharedByteArrayInputStream, SharedFileInputStream

public interface SharedInputStream

An InputStream that is backed by data that can be shared by multiple readers may implement this interface. This allows users of such an InputStream to determine the current position in the InputStream, and to create new InputStreams representing a subset of the data in the original InputStream. The new InputStream will access the same underlying data as the original, without copying the data.

Note that implementations of this interface must ensure that the close method does not close any underlying stream that might be shared by multiple instances of SharedInputStream until all shared instances have been closed.

从以下版本开始：

JavaMail 1.2

版本：

1.5, 07/05/04

作者：

Bill Shannon

方法摘要

long	getPosition() Return the current position in the InputStream, as an offset from the beginning of the InputStream.
InputStream	newStream(long start, long end) Return a new InputStream representing a subset of the data from this InputStream, starting at start (inclusive) up to end (exclusive).

方法详细信息

getPosition

long getPosition()

Return the current position in the InputStream, as an offset from the beginning of the InputStream.

返回：

the current position

newStream

InputStream newStream(long start,
                      long end)

Return a new InputStream representing a subset of the data from this InputStream, starting at start (inclusive) up to end (exclusive). start must be non-negative. If end is -1, the new stream ends at the same place as this stream. The returned InputStream will also implement the SharedInputStream interface.

参数：

start - the starting position

end - the ending position + 1

返回：

the new stream