org.apache.hadoop.fs

接口 PositionedReadable

所有已知实现类:

BufferedFSInputStream, ByteRangeInputStream, DFSClient.DFSDataInputStream, DFSClient.DFSInputStream, DFSClient.RemoteBlockReader, FSDataInputStream, FSInputChecker, FSInputStream, FTPInputStream

public interface PositionedReadable

Stream that permits positional reading.

方法概要

方法

限定符和类型	方法和说明
int	read(long position, byte[] buffer, int offset, int length) Read upto the specified number of bytes, from a given position within a file, and return the number of bytes read.
void	readFully(long position, byte[] buffer) Read number of bytes equalt to the length of the buffer, from a given position within a file.
void	readFully(long position, byte[] buffer, int offset, int length) Read the specified number of bytes, from a given position within a file.

方法详细资料

read

int read(long position,
       byte[] buffer,
       int offset,
       int length)
         throws IOException

Read upto the specified number of bytes, from a given position within a file, and return the number of bytes read. This does not change the current offset of a file, and is thread-safe.

抛出:

IOException

readFully

void readFully(long position,
             byte[] buffer,
             int offset,
             int length)
               throws IOException

Read the specified number of bytes, from a given position within a file. This does not change the current offset of a file, and is thread-safe.

抛出:

IOException

readFully

void readFully(long position,
             byte[] buffer)
               throws IOException

Read number of bytes equalt to the length of the buffer, from a given position within a file. This does not change the current offset of a file, and is thread-safe.

抛出:

IOException