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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:

java.util.zip.ZipConstants

Direct Known Subclasses:

JarOutputStream

public class ZipOutputStream

extends DeflaterOutputStream

implements java.util.zip.ZipConstants

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

Field Summary

static int	CENATT
static int	CENATX
static int	CENCOM
static int	CENCRC
static int	CENDSK
static int	CENEXT
static int	CENFLG
static int	CENHDR
static int	CENHOW
static int	CENLEN
static int	CENNAM
static int	CENOFF
static long	CENSIG
static int	CENSIZ
static int	CENTIM
static int	CENVEM
static int	CENVER
static int	DEFLATED Compression method for compressed (DEFLATED) entries.
static int	ENDCOM
static int	ENDHDR
static int	ENDOFF
static long	ENDSIG
static int	ENDSIZ
static int	ENDSUB
static int	ENDTOT
static int	EXTCRC
static int	EXTHDR
static int	EXTLEN
static long	EXTSIG
static int	EXTSIZ
static int	LOCCRC
static int	LOCEXT
static int	LOCFLG
static int	LOCHDR
static int	LOCHOW
static int	LOCLEN
static int	LOCNAM
static long	LOCSIG
static int	LOCSIZ
static int	LOCTIM
static int	LOCVER
static int	STORED Compression method for uncompressed (STORED) entries.

Fields inherited from class java.util.zip.DeflaterOutputStream

buf, def

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

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

Method Summary

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 inherited from class java.util.zip.DeflaterOutputStream

deflate, write

Methods inherited from class java.io.FilterOutputStream

flush, write

Methods inherited from class java.lang.Object

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

Field Detail

STORED

public static final int STORED

Compression method for uncompressed (STORED) entries.

DEFLATED

public static final int DEFLATED

Compression method for compressed (DEFLATED) entries.

LOCSIG

public static final long LOCSIG

EXTSIG

public static final long EXTSIG

CENSIG

public static final long CENSIG

ENDSIG

public static final long ENDSIG

LOCHDR

public static final int LOCHDR

EXTHDR

public static final int EXTHDR

CENHDR

public static final int CENHDR

ENDHDR

public static final int ENDHDR

LOCVER

public static final int LOCVER

LOCFLG

public static final int LOCFLG

LOCHOW

public static final int LOCHOW

LOCTIM

public static final int LOCTIM

LOCCRC

public static final int LOCCRC

LOCSIZ

public static final int LOCSIZ

LOCLEN

public static final int LOCLEN

LOCNAM

public static final int LOCNAM

LOCEXT

public static final int LOCEXT

EXTCRC

public static final int EXTCRC

EXTSIZ

public static final int EXTSIZ

EXTLEN

public static final int EXTLEN

CENVEM

public static final int CENVEM

CENVER

public static final int CENVER

CENFLG

public static final int CENFLG

CENHOW

public static final int CENHOW

CENTIM

public static final int CENTIM

CENCRC

public static final int CENCRC

CENSIZ

public static final int CENSIZ

CENLEN

public static final int CENLEN

CENNAM

public static final int CENNAM

CENEXT

public static final int CENEXT

CENCOM

public static final int CENCOM

CENDSK

public static final int CENDSK

CENATT

public static final int CENATT

CENATX

public static final int CENATX

CENOFF

public static final int CENOFF

ENDSUB

public static final int ENDSUB

ENDTOT

public static final int ENDTOT

ENDSIZ

public static final int ENDSIZ

ENDOFF

public static final int ENDOFF

ENDCOM

public static final int ENDCOM

Constructor Detail

ZipOutputStream

public ZipOutputStream(OutputStream out)

Creates a new ZIP output stream.

Parameters:

out - the actual output stream

Method Detail

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, and 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

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.

Overrides:

close in class DeflaterOutputStream

Throws:

ZipException - if a ZIP file error has occurred

IOException - if an I/O error has occurred