Module java.base
Package java.util.zip

# Class ZipOutputStream

java.lang.Object
java.io.OutputStream
java.io.FilterOutputStream
java.util.zip.DeflaterOutputStream
java.util.zip.ZipOutputStream

All Implemented Interfaces:
  `Closeable`, `Flushable`, `AutoCloseable`

Direct Known Subclasses:
  `JarOutputStream`

public class ZipOutputStream extends DeflaterOutputStream
This class implements an output stream filter for writing files in the ZIP file format. Includes support for both compressed and uncompressed entries.

Since:
  1.1

## Field Summary

Fields
Modifier and Type
Field
Description
`static final int`
`CENATT`
Central directory (CEN) header internal file attributes field offset.
`static final int`
`CENATX`
Central directory (CEN) header external file attributes field offset.
`static final int`
`CENCOM`
Central directory (CEN) header comment length field offset.
`static final int`
`CENCRC`
Central directory (CEN) header uncompressed file crc-32 value field offset.
`static final int`
`CENDSK`
Central directory (CEN) header disk number start field offset.
`static final int`
`CENEXT`
Central directory (CEN) header extra field length field offset.
`static final int`
`CENFLG`
Central directory (CEN) header encrypt, decrypt flags field offset.
`static final int`
`CENHDR`
Central directory (CEN) header size in bytes (including signature).
`static final int`
`CENHOW`
Central directory (CEN) header compression method field offset.
`static final int`
`CENLEN`
Central directory (CEN) header uncompressed size field offset.
`static final int`
`CENNAM`
Central directory (CEN) header filename length field offset.
`static final int`
`CENOFF`
Central directory (CEN) header LOC header offset field offset.
`static final long`
`CENSIG`
Central directory (CEN) header signature.
`static final int`
`CENSIZ`
Central directory (CEN) header compressed size field offset.
`static final int`
`CENTIM`
Central directory (CEN) header modification time field offset.
`static final int`
`CENVEM`
Central directory (CEN) header version made by field offset.
`static final int`
`CENVER`
Central directory (CEN) header version needed to extract field offset.
`static final int`
`DEFLATED`
Compression method for compressed (DEFLATED) entries.
`static final int`
`ENDCOM`
End of central directory (END) header zip file comment length field offset.
`static final int`
`ENDHDR`
End of central directory (END) header size in bytes (including signature).
`static final int`
`ENDOFF`
End of central directory (END) header offset for the first CEN header field offset.
`static final long`
`ENDSIG`
End of central directory (END) header signature.
`static final int`
`ENDSIZ`
End of central directory (END) header central directory size in bytes field offset.
`static final int`
`ENDSUB`
End of central directory (END) header number of entries on this disk field offset.
`static final int`
`ENDTOT`
End of central directory (END) header total number of entries field offset.
`static final int`
`EXTCRC`
Extra local (EXT) header uncompressed file crc-32 value field offset.
`static final int`
`EXTHDR`
Extra local (EXT) header size in bytes (including signature).
`static final int`
`EXTLEN`
Extra local (EXT) header uncompressed size field offset.
`static final long`
`EXTSIG`
Extra local (EXT) header signature.
`static final int`
`EXTSIZ`
Extra local (EXT) header compressed size field offset.
`static final int`
`LOCCRC`
Local file (LOC) header uncompressed file crc-32 value field offset.
`static final int`
`LOCEXT`
Local file (LOC) header extra field length field offset.
`static final int`
`LOCFLG`
Local file (LOC) header general purpose bit flag field offset.
`static final int`
`LOCHDR`
Local file (LOC) header size in bytes (including signature).
`static final int`
`LOCHOW`
Local file (LOC) header compression method field offset.
`static final int`
`LOCLEN`
Local file (LOC) header uncompressed size field offset.
`static final int`
`LOCNAM`
Local file (LOC) header filename length field offset.
`static final long`
`LOCSIG`
Local file (LOC) header signature.
`static final int`
`LOCSIZ`
Local file (LOC) header compressed size field offset.
`static final int`
`LOCTIM`
Local file (LOC) header modification time field offset.
`static final int`
`LOCVER`
Local file (LOC) header version needed to extract field offset.
`static final int`
`STORED`
Compression method for uncompressed (STORED) entries.

### Fields declared in class java.util.zip.DeflaterOutputStream

`buf, def`

### Fields declared in class java.io.FilterOutputStream

`out`

## Constructor Summary

Constructors
Constructor
Description
`ZipOutputStream(OutputStream out)`
Creates a new ZIP output stream.
`ZipOutputStream(OutputStream out, Charset charset)`
Creates a new ZIP output stream.

## Method Summary

Modifier and Type
Method
Description
`void`
`close()`
Closes the ZIP output stream as well as the stream being filtered.
`void`
`closeEntry()`
Closes the current ZIP entry and positions the stream for writing the next entry.
`void`
`finish()`
Finishes writing the contents of the ZIP output stream without closing the underlying stream.
`void`
`putNextEntry(ZipEntry e)`
Begins writing a new ZIP file entry and positions the stream to the start of the entry data.
`void`
`setComment(String comment)`
Sets the ZIP file comment.
`void`
`setLevel(int level)`
Sets the compression level for subsequent entries which are DEFLATED.
`void`
`setMethod(int method)`
Sets the default compression method for subsequent entries.
`void`
`write(byte[] b, int off, int len)`
Writes an array of bytes to the current ZIP entry data.

### Methods declared in class java.util.zip.DeflaterOutputStream

`deflate, flush, write`

### Methods declared in class java.io.FilterOutputStream

`write`

### Methods declared in class java.io.OutputStream

`nullOutputStream`

### Methods declared in class java.lang.Object

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

## Field Details

### STORED

public static final int STORED
Compression method for uncompressed (STORED) entries.

See Also:
  - Constant Field Values

### DEFLATED

public static final int DEFLATED
Compression method for compressed (DEFLATED) entries.

See Also:
  - Constant Field Values

### LOCSIG

static final long LOCSIG
Local file (LOC) header signature.

See Also:
  - Constant Field Values

### EXTSIG

static final long EXTSIG
Extra local (EXT) header signature.

See Also:
  - Constant Field Values

### CENSIG

static final long CENSIG
Central directory (CEN) header signature.

See Also:
  - Constant Field Values

### ENDSIG

static final long ENDSIG
End of central directory (END) header signature.

See Also:
  - Constant Field Values

### LOCHDR

static final int LOCHDR
Local file (LOC) header size in bytes (including signature).

See Also:
  - Constant Field Values

### EXTHDR

static final int EXTHDR
Extra local (EXT) header size in bytes (including signature).

See Also:
  - Constant Field Values

### CENHDR

static final int CENHDR
Central directory (CEN) header size in bytes (including signature).

See Also:
  - Constant Field Values

### ENDHDR

static final int ENDHDR
End of central directory (END) header size in bytes (including signature).

See Also:
  - Constant Field Values

### LOCVER

static final int LOCVER
Local file (LOC) header version needed to extract field offset.

See Also:
  - Constant Field Values

### LOCFLG

static final int LOCFLG
Local file (LOC) header general purpose bit flag field offset.

See Also:
  - Constant Field Values

### LOCHOW

static final int LOCHOW
Local file (LOC) header compression method field offset.

See Also:
  - Constant Field Values

### LOCTIM

static final int LOCTIM
Local file (LOC) header modification time field offset.

See Also:
  - Constant Field Values

### LOCCRC

static final int LOCCRC
Local file (LOC) header uncompressed file crc-32 value field offset.

See Also:
  - Constant Field Values

### LOCSIZ

static final int LOCSIZ
Local file (LOC) header compressed size field offset.

See Also:
  - Constant Field Values

### LOCLEN

static final int LOCLEN
Local file (LOC) header uncompressed size field offset.

See Also:
  - Constant Field Values

### LOCNAM

static final int LOCNAM
Local file (LOC) header filename length field offset.

See Also:
  - Constant Field Values

### LOCEXT

static final int LOCEXT
Local file (LOC) header extra field length field offset.

See Also:
  - Constant Field Values

### EXTCRC

static final int EXTCRC
Extra local (EXT) header uncompressed file crc-32 value field offset.

See Also:
  - Constant Field Values

### EXTSIZ

static final int EXTSIZ
Extra local (EXT) header compressed size field offset.

See Also:
  - Constant Field Values

### EXTLEN

static final int EXTLEN
Extra local (EXT) header uncompressed size field offset.

See Also:
  - Constant Field Values

### CENVEM

static final int CENVEM
Central directory (CEN) header version made by field offset.

See Also:
  - Constant Field Values

### CENVER

static final int CENVER
Central directory (CEN) header version needed to extract field offset.

See Also:
  - Constant Field Values

### CENFLG

static final int CENFLG
Central directory (CEN) header encrypt, decrypt flags field offset.

See Also:
  - Constant Field Values

### CENHOW

static final int CENHOW
Central directory (CEN) header compression method field offset.

See Also:
  - Constant Field Values

### CENTIM

static final int CENTIM
Central directory (CEN) header modification time field offset.

See Also:
  - Constant Field Values

### CENCRC

static final int CENCRC
Central directory (CEN) header uncompressed file crc-32 value field offset.

See Also:
  - Constant Field Values

### CENSIZ

static final int CENSIZ
Central directory (CEN) header compressed size field offset.

See Also:
  - Constant Field Values

### CENLEN

static final int CENLEN
Central directory (CEN) header uncompressed size field offset.

See Also:
  - Constant Field Values

### CENNAM

static final int CENNAM
Central directory (CEN) header filename length field offset.

See Also:
  - Constant Field Values

### CENEXT

static final int CENEXT
Central directory (CEN) header extra field length field offset.

See Also:
  - Constant Field Values

### CENCOM

static final int CENCOM
Central directory (CEN) header comment length field offset.

See Also:
  - Constant Field Values

### CENDSK

static final int CENDSK
Central directory (CEN) header disk number start field offset.

See Also:
  - Constant Field Values

### CENATT

static final int CENATT
Central directory (CEN) header internal file attributes field offset.

See Also:
  - Constant Field Values

### CENATX

static final int CENATX
Central directory (CEN) header external file attributes field offset.

See Also:
  - Constant Field Values

### CENOFF

static final int CENOFF
Central directory (CEN) header LOC header offset field offset.

See Also:
  - Constant Field Values

### ENDSUB

static final int ENDSUB
End of central directory (END) header number of entries on this disk field offset.

See Also:
  - Constant Field Values

### ENDTOT

static final int ENDTOT
End of central directory (END) header total number of entries field offset.

See Also:
  - Constant Field Values

### ENDSIZ

static final int ENDSIZ
End of central directory (END) header central directory size in bytes field offset.

See Also:
  - Constant Field Values

### ENDOFF

static final int ENDOFF
End of central directory (END) header offset for the first CEN header field offset.

See Also:
  - Constant Field Values

### ENDCOM

static final int ENDCOM
End of central directory (END) header zip file comment length field offset.

See Also:
  - Constant Field Values

## Constructor Details

### ZipOutputStream

public ZipOutputStream(OutputStream out)
Creates a new ZIP output stream.

The UTF-8 `charset` is used to encode the entry names and comments.

Parameters:
  `out` - the actual output stream

### ZipOutputStream

public ZipOutputStream(OutputStream out, Charset charset)
Creates a new ZIP output stream.

Parameters:
  `out` - the actual output stream
  `charset` - the charset to be used to encode the entry names and comments
Since:
  1.7

## Method Details

### setComment

public void setComment(String comment)
Sets the ZIP file comment.

Parameters:
  `comment` - the comment string
Throws:
  `IllegalArgumentException` - if the length of the specified ZIP file comment is greater than 0xFFFF bytes

### setMethod

public void setMethod(int method)
Sets the default compression method for subsequent entries. This default will be used whenever the compression method is not specified for an individual ZIP file entry, and is initially set to DEFLATED.

Parameters:
  `method` - the default compression method
Throws:
  `IllegalArgumentException` - if the specified compression method is invalid

### setLevel

public void setLevel(int level)
Sets the compression level for subsequent entries which are DEFLATED. The default setting is DEFAULT_COMPRESSION.

Parameters:
  `level` - the compression level (0-9)
Throws:
  `IllegalArgumentException` - if the compression level is invalid

### putNextEntry

public void putNextEntry(ZipEntry e) throws IOException
Begins writing a new ZIP file entry and positions the stream to the start of the entry data. Closes the current entry if still active.

The default compression method will be used if no compression method was specified for the entry. When writing a compressed (DEFLATED) entry, and the compressed size has not been explicitly set with the `ZipEntry.setCompressedSize(long)` method, then the compressed size will be set to the actual compressed size after deflation.

The current time will be used if the entry has no set modification time.

Parameters:
  `e` - the ZIP entry to be written
Throws:
  `ZipException` - if a ZIP format error has occurred
  `IOException` - if an I/O error has occurred

### closeEntry

public void closeEntry() throws IOException
Closes the current ZIP entry and positions the stream for writing the next entry.

Throws:
  `ZipException` - if a ZIP format error has occurred
  `IOException` - if an I/O error has occurred

### write

public void write(byte[] b, int off, int len) throws IOException
Writes an array of bytes to the current ZIP entry data. This method will block until all the bytes are written.

Overrides:
  `write` in class `DeflaterOutputStream`
Parameters:
  `b` - the data to be written
  `off` - the start offset in the data
  `len` - the number of bytes that are written
Throws:
  `ZipException` - if a ZIP file error has occurred
  `IOException` - if an I/O error has occurred
See Also:
  - `FilterOutputStream.write(int)`

### finish

public void finish() throws IOException
Finishes writing the contents of the ZIP 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:
  `ZipException` - if a ZIP file error has occurred
  `IOException` - if an I/O exception has occurred

### close

public void close() throws IOException
Closes the ZIP output stream as well as the stream being filtered.

Specified by:
  `close` in interface `AutoCloseable`
Specified by:
  `close` in interface `Closeable`
Overrides:
  `close` in class `DeflaterOutputStream`
Throws:
  `ZipException` - if a ZIP file error has occurred
  `IOException` - if an I/O error has occurred
See Also:
  - `FilterOutputStream.flush()`
  - `FilterOutputStream.out`