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:

ZipConstants

Direct Known Subclasses:

JarOutputStream

public class ZipOutputStream

extends DeflaterOutputStream

implements ZipConstants

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

Author:

David Connelly

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
private boolean	closed
private String	comment
private CRC32	crc
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
private Vector	entries
private ZipEntry	entry
static int	EXTCRC
static int	EXTHDR
static int	EXTLEN
static long	EXTSIG
static int	EXTSIZ
private boolean	finished
static int	LOCCRC
static int	LOCEXT
static int	LOCFLG
static int	LOCHDR
static int	LOCHOW
static int	LOCLEN
static int	LOCNAM
private long	locoff
static long	LOCSIG
static int	LOCSIZ
static int	LOCTIM
static int	LOCVER
private int	method
private Hashtable	names
static int	STORED Compression method for uncompressed (STORED) entries.
private long	written

Fields inherited from class java.util.zip.DeflaterOutputStream

buf, def, usesDefaultDeflater

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.
private void	ensureOpen() Check to make sure that this stream has not been closed
void	finish() Finishes writing the contents of the ZIP output stream without closing the underlying stream.
private static byte[]	getUTF8Bytes(String s)
(package private) static int	getUTF8Length(String s)
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.
private void	writeBytes(byte[] b, int off, int len)
private void	writeCEN(ZipEntry e)
private void	writeEND(long off, long len)
private void	writeEXT(ZipEntry e)
private void	writeInt(long v)
private void	writeLOC(ZipEntry e)
private void	writeShort(int v)

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

entry

private ZipEntry entry

entries

private Vector entries

names

private Hashtable names

crc

private CRC32 crc

written

private long written

locoff

private long locoff

comment

private String comment

method

private int method

finished

private boolean finished

closed

private boolean closed

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

public static final long LOCSIG

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Constant Field Values

EXTSIG

public static final long EXTSIG

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Constant Field Values

CENSIG

public static final long CENSIG

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Constant Field Values

ENDSIG

public static final long ENDSIG

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Constant Field Values

LOCHDR

public static final int LOCHDR

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Constant Field Values

EXTHDR

public static final int EXTHDR

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Constant Field Values

CENHDR

public static final int CENHDR

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Constant Field Values

ENDHDR

public static final int ENDHDR

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Constant Field Values

LOCVER

public static final int LOCVER

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Constant Field Values

LOCFLG

public static final int LOCFLG

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Constant Field Values

LOCHOW

public static final int LOCHOW

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Constant Field Values

LOCTIM

public static final int LOCTIM

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Constant Field Values

LOCCRC

public static final int LOCCRC

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Constant Field Values

LOCSIZ

public static final int LOCSIZ

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Constant Field Values

LOCLEN

public static final int LOCLEN

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Constant Field Values

LOCNAM

public static final int LOCNAM

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Constant Field Values

LOCEXT

public static final int LOCEXT

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Constant Field Values

EXTCRC

public static final int EXTCRC

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Constant Field Values

EXTSIZ

public static final int EXTSIZ

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EXTLEN

public static final int EXTLEN

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Constant Field Values

CENVEM

public static final int CENVEM

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Constant Field Values

CENVER

public static final int CENVER

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Constant Field Values

CENFLG

public static final int CENFLG

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CENHOW

public static final int CENHOW

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Constant Field Values

CENTIM

public static final int CENTIM

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Constant Field Values

CENCRC

public static final int CENCRC

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Constant Field Values

CENSIZ

public static final int CENSIZ

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CENLEN

public static final int CENLEN

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CENNAM

public static final int CENNAM

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CENEXT

public static final int CENEXT

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CENCOM

public static final int CENCOM

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CENDSK

public static final int CENDSK

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CENATT

public static final int CENATT

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CENATX

public static final int CENATX

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CENOFF

public static final int CENOFF

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ENDSUB

public static final int ENDSUB

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Constant Field Values

ENDTOT

public static final int ENDTOT

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ENDSIZ

public static final int ENDSIZ

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ENDOFF

public static final int ENDOFF

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ENDCOM

public static final int ENDCOM

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Constant Field Values

Constructor Detail

ZipOutputStream

public ZipOutputStream(OutputStream out)

Creates a new ZIP output stream.

Parameters:

out - the actual output stream

Method Detail

ensureOpen

private void ensureOpen()
                 throws IOException

Check to make sure that this stream has not been closed

Throws:

IOException

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

writeLOC

private void writeLOC(ZipEntry e)
               throws IOException

Throws:

IOException

writeEXT

private void writeEXT(ZipEntry e)
               throws IOException

Throws:

IOException

writeCEN

private void writeCEN(ZipEntry e)
               throws IOException

Throws:

IOException

writeEND

private void writeEND(long off,
                      long len)
               throws IOException

Throws:

IOException

writeShort

private void writeShort(int v)
                 throws IOException

Throws:

IOException

writeInt

private void writeInt(long v)
               throws IOException

Throws:

IOException

writeBytes

private void writeBytes(byte[] b,
                        int off,
                        int len)
                 throws IOException

Throws:

IOException

getUTF8Length

static int getUTF8Length(String s)

getUTF8Bytes

private static byte[] getUTF8Bytes(String s)