java.lang.Object
- java.io.OutputStream
- - java.io.FilterOutputStream
  - - java.util.zip.DeflaterOutputStream
    - - java.util.zip.GZIPOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable
```
public class GZIPOutputStream
extends DeflaterOutputStream
```
This class implements a stream filter for writing compressed data in the GZIP file format.

Field Summary
Fields
Modifier and Type Field and Description

protected CRC32 crc
CRC-32 of uncompressed data.

GZIPOutputStream (Java Platform SE 7 ) Home of API Java Contents Haut
- Fields inherited from class java.util.zip.DeflaterOutputStream buf, def
- Fields inherited from class java.io.FilterOutputStream out

Constructor Summary

Constructors
Constructor and Description
`GZIPOutputStream(OutputStream out)` Creates a new output stream with a default buffer size.
`GZIPOutputStream(OutputStream out, boolean syncFlush)` Creates a new output stream with a default buffer size and the specified flush mode.
`GZIPOutputStream(OutputStream out, int size)` Creates a new output stream with the specified buffer size.
`GZIPOutputStream(OutputStream out, int size, boolean syncFlush)` Creates a new output stream with the specified buffer size and flush mode.

GZIPOutputStream (Java Platform SE 7 ) Home of API Java Contents Haut

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`finish()` Finishes writing compressed data to the output stream without closing the underlying stream.
`void`	`write(byte[] buf, int off, int len)` Writes array of bytes to the compressed output stream.

GZIPOutputStream (Java Platform SE 7 ) Home of API Java Contents Haut

Methods inherited from class java.util.zip.DeflaterOutputStream close, deflate, flush, write

Methods inherited from class java.io.FilterOutputStream write

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

- Field Detail
  - crc
    protected CRC32 crc
    
    CRC-32 of uncompressed data.
- Constructor Detail
  - GZIPOutputStream
    public GZIPOutputStream(OutputStream out, int size) throws IOException
    
    Creates a new output stream with the specified buffer size.
    The new output stream instance is created as if by invoking the 3-argument constructor GZIPOutputStream(out, size, false).
    
    Parameters:
    out - the output stream
    size - the output buffer size
    
    Throws:
    
    IOException - If an I/O error has occurred.
    
    IllegalArgumentException - if size is <= 0
  - GZIPOutputStream
    public GZIPOutputStream(OutputStream out, int size, boolean syncFlush) throws IOException
    
    Creates a new output stream with the specified buffer size and flush mode.
    
    Parameters:
    out - the output stream
    size - the output buffer size
    syncFlush - if true invocation of the inherited flush() method of this instance flushes the compressor with flush mode Deflater.SYNC_FLUSH before flushing the output stream, otherwise only flushes the output stream
    
    Throws:
    
    IOException - If an I/O error has occurred.
    
    IllegalArgumentException - if size is <= 0
    Since:
    
    1.7
  - GZIPOutputStream
    public GZIPOutputStream(OutputStream out) throws IOException
    
    Creates a new output stream with a default buffer size.
    The new output stream instance is created as if by invoking the 2-argument constructor GZIPOutputStream(out, false).
    
    Parameters:
    out - the output stream
    
    Throws:
    
    IOException - If an I/O error has occurred.
  - GZIPOutputStream
    public GZIPOutputStream(OutputStream out, boolean syncFlush) throws IOException
    
    Creates a new output stream with a default buffer size and the specified flush mode.
    
    Parameters:
    out - the output stream
    syncFlush - if true invocation of the inherited flush() method of this instance flushes the compressor with flush mode Deflater.SYNC_FLUSH before flushing the output stream, otherwise only flushes the output stream
    
    Throws:
    
    IOException - If an I/O error has occurred.
    Since:
    
    1.7
- Method Detail
  - write
    public void write(byte[] buf, int off, int len) throws IOException
    
    Writes array of bytes to the compressed output stream. This method will block until all the bytes are written.
    
    Overrides:
    
    write in class DeflaterOutputStream
    
    Parameters:
    buf - the data to be written
    off - the start offset of the data
    len - the length of the data
    
    Throws:
    
    IOException - If an I/O error has occurred.
    See Also:
    FilterOutputStream.write(int)
  - finish
    public void finish() throws IOException
    
    Finishes writing compressed data to the output stream without closing the underlying stream. Use this method when applying multiple filters in succession to the same output stream.
    
    Overrides:
    
    finish in class DeflaterOutputStream
    
    Throws:
    
    IOException - if an I/O error has occurred

Document created the 11/06/2005, last modified the 04/03/2020
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References

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Class GZIPOutputStream

References