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java.lang.Object
- java.io.OutputStream
- - java.io.FilterOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

Direct Known Subclasses:

BufferedOutputStream, CheckedOutputStream, CipherOutputStream, DataOutputStream, DeflaterOutputStream, DigestOutputStream, InflaterOutputStream, PrintStream
```
public class FilterOutputStream
extends OutputStream
```
This class is the superclass of all classes that filter output streams. These streams sit on top of an already existing output stream (the underlying output stream) which it uses as its basic sink of data, but possibly transforming the data along the way or providing additional functionality.
The class FilterOutputStream itself simply overrides all methods of OutputStream with versions that pass all requests to the underlying output stream. Subclasses of FilterOutputStream may further override some of these methods as well as provide additional methods and fields.

Since:

JDK1.0

Field Summary
Fields
Modifier and Type Field and Description

protected OutputStream out
The underlying output stream to be filtered.

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Constructor Summary
Constructors
Constructor and Description

FilterOutputStream(OutputStream out)
Creates an output stream filter built on top of the specified underlying output stream.

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Method Summary

Methods
Modifier and Type	Method and Description
`void`	`close()` Closes this output stream and releases any system resources associated with the stream.
`void`	`flush()` Flushes this output stream and forces any buffered output bytes to be written out to the stream.
`void`	`write(byte[] b)` Writes `b.length` bytes to this output stream.
`void`	`write(byte[] b, int off, int len)` Writes `len` bytes from the specified `byte` array starting at offset `off` to this output stream.
`void`	`write(int b)` Writes the specified `byte` to this output stream.

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Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - out
    protected OutputStream out
    
    The underlying output stream to be filtered.
- Constructor Detail
  - FilterOutputStream
    public FilterOutputStream(OutputStream out)
    
    Creates an output stream filter built on top of the specified underlying output stream.
    
    Parameters:
    out - the underlying output stream to be assigned to the field this.out for later use, or null if this instance is to be created without an underlying stream.
- Method Detail
  - write
    public void write(int b) throws IOException
    
    Writes the specified byte to this output stream.
    The write method of FilterOutputStream calls the write method of its underlying output stream, that is, it performs out.write(b).
    Implements the abstract write method of OutputStream.
    
    Specified by:
    
    write in class OutputStream
    
    Parameters:
    b - the byte.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - write
    public void write(byte[] b) throws IOException
    
    Writes b.length bytes to this output stream.
    The write method of FilterOutputStream calls its write method of three arguments with the arguments b, 0, and b.length.
    Note that this method does not call the one-argument write method of its underlying stream with the single argument b.
    
    Overrides:
    
    write in class OutputStream
    
    Parameters:
    b - the data to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    write(byte[], int, int)
  - 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 output stream.
    The write method of FilterOutputStream calls the write method of one argument on each byte to output.
    Note that this method does not call the write method of its underlying input stream with the same arguments. Subclasses of FilterOutputStream should provide a more efficient implementation of this method.
    
    Overrides:
    
    write in class OutputStream
    
    Parameters:
    b - the data.
    off - the start offset in the data.
    len - the number of bytes to write.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    write(int)
  - flush
    public void flush() throws IOException
    
    Flushes this output stream and forces any buffered output bytes to be written out to the stream.
    The flush method of FilterOutputStream calls the flush method of its underlying output stream.
    
    Specified by:
    
    flush in interface Flushable
    
    Overrides:
    
    flush in class OutputStream
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    out
  - close
    public void close() throws IOException
    
    Closes this output stream and releases any system resources associated with the stream.
    The close method of FilterOutputStream calls its flush method, and then calls the close method of its underlying output stream.
    
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Overrides:
    
    close in class OutputStream
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    flush(), out

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Bij voorbaat dank.

Document heeft de 11/06/2005 gemaakt, de laatste keer de 04/03/2020 gewijzigd
Bron van het afgedrukte document:https://www.gaudry.be/nl/java-api-rf-java/io/FilterOutputStream.html

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