com.mongodb.client.gridfs

类 GridFSDownloadStream

java.lang.Object

java.io.InputStream

com.mongodb.client.gridfs.GridFSDownloadStream

所有已实现的接口:

java.io.Closeable, java.lang.AutoCloseable

@NotThreadSafe
public abstract class GridFSDownloadStream
extends java.io.InputStream

A GridFS InputStream for downloading data from GridFS

Provides the GridFSFile for the file to being downloaded as well as the read methods of a InputStream

This implementation of a InputStream will not throw IOExceptions. However, it will throw a MongoException if there is an error reading from MongoDB.

从以下版本开始:

3.1

构造器概要

构造器

构造器和说明
GridFSDownloadStream()

方法概要

限定符和类型	方法和说明
abstract int	available()
abstract GridFSDownloadStream	batchSize(int batchSize) Sets the number of chunks to return per batch.
abstract void	close()
abstract GridFSFile	getGridFSFile() Gets the corresponding GridFSFile for the file being downloaded
abstract void	mark() Marks the current position in this input stream.
abstract int	read()
abstract int	read(byte[] b)
abstract int	read(byte[] b, int off, int len)
abstract void	reset()
abstract long	skip(long n)

从类继承的方法 java.io.InputStream

mark, markSupported

从类继承的方法 java.lang.Object

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

构造器详细资料

GridFSDownloadStream

public GridFSDownloadStream()

方法详细资料

getGridFSFile

public abstract GridFSFile getGridFSFile()

Gets the corresponding GridFSFile for the file being downloaded

返回:

the corresponding GridFSFile for the file being downloaded

batchSize

public abstract GridFSDownloadStream batchSize(int batchSize)

Sets the number of chunks to return per batch.

Can be used to control the memory consumption of this InputStream. The smaller the batchSize the lower the memory consumption and higher latency.

参数:

batchSize - the batch size

返回:

this

MongoDB documentation

Batch Size

read

public abstract int read()

指定者:

read 在类中 java.io.InputStream

read

public abstract int read(byte[] b)

覆盖:

read 在类中 java.io.InputStream

read

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

覆盖:

read 在类中 java.io.InputStream

skip

public abstract long skip(long n)

覆盖:

skip 在类中 java.io.InputStream

available

public abstract int available()

覆盖:

available 在类中 java.io.InputStream

mark

public abstract void mark()

Marks the current position in this input stream.

A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes.

reset

public abstract void reset()

覆盖:

reset 在类中 java.io.InputStream

close

public abstract void close()

指定者:

close 在接口中 java.io.Closeable

指定者:

close 在接口中 java.lang.AutoCloseable

覆盖:

close 在类中 java.io.InputStream