Module java.base

Package java.util.zip

Class ZipEntry

java.lang.Object

java.util.zip.ZipEntry

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

JarEntry

public class ZipEntry
extends Object
implements Cloneable

This class is used to represent a ZIP file entry.

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 entries.

Constructor Summary

Constructors

Constructor	Description
ZipEntry(String name)	Creates a new zip entry with the specified name.
ZipEntry(ZipEntry e)	Creates a new zip entry with fields taken from the specified zip entry.

Method Summary

Modifier and Type	Method	Description
Object	clone()	Returns a copy of this entry.
String	getComment()	Returns the comment string for the entry.
long	getCompressedSize()	Returns the size of the compressed entry data.
long	getCrc()	Returns the CRC-32 checksum of the uncompressed entry data.
FileTime	getCreationTime()	Returns the creation time of the entry.
byte[]	getExtra()	Returns the extra field data for the entry.
FileTime	getLastAccessTime()	Returns the last access time of the entry.
FileTime	getLastModifiedTime()	Returns the last modification time of the entry.
int	getMethod()	Returns the compression method of the entry.
String	getName()	Returns the name of the entry.
long	getSize()	Returns the uncompressed size of the entry data.
long	getTime()	Returns the last modification time of the entry.
LocalDateTime	getTimeLocal()	Returns the last modification time of the entry in local date-time.
int	hashCode()	Returns the hash code value for this entry.
boolean	isDirectory()	Returns true if this is a directory entry.
void	setComment(String comment)	Sets the optional comment string for the entry.
void	setCompressedSize(long csize)	Sets the size of the compressed entry data.
void	setCrc(long crc)	Sets the CRC-32 checksum of the uncompressed entry data.
ZipEntry	setCreationTime(FileTime time)	Sets the creation time of the entry.
void	setExtra(byte[] extra)	Sets the optional extra field data for the entry.
ZipEntry	setLastAccessTime(FileTime time)	Sets the last access time of the entry.
ZipEntry	setLastModifiedTime(FileTime time)	Sets the last modification time of the entry.
void	setMethod(int method)	Sets the compression method for the entry.
void	setSize(long size)	Sets the uncompressed size of the entry data.
void	setTime(long time)	Sets the last modification time of the entry.
void	setTimeLocal(LocalDateTime time)	Sets the last modification time of the entry in local date-time.
String	toString()	Returns a string representation of the ZIP entry.

Methods declared in class java.lang.Object

equals, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

STORED

public static final int STORED

Compression method for uncompressed 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

ZipEntry

public ZipEntry(String name)

Creates a new zip entry with the specified name.

Parameters:

name - The entry name

Throws:

NullPointerException - if the entry name is null

IllegalArgumentException - if the entry name is longer than 0xFFFF bytes

ZipEntry

public ZipEntry(ZipEntry e)

Creates a new zip entry with fields taken from the specified zip entry.

Parameters:

e - A zip Entry object

Throws:

NullPointerException - if the entry object is null

Method Details

getName

public String getName()

Returns the name of the entry.

Returns:

the name of the entry

setTime

public void setTime(long time)

Sets the last modification time of the entry.

If the entry is output to a ZIP file or ZIP file formatted output stream the last modification time set by this method will be stored into the date and time fields of the zip file entry and encoded in standard MS-DOS date and time format. The default TimeZone is used to convert the epoch time to the MS-DOS date and time.

Parameters:

time - The last modification time of the entry in milliseconds since the epoch

See Also:

• getTime()
• getLastModifiedTime()

getTime

public long getTime()

Returns the last modification time of the entry.

If the entry is read from a ZIP file or ZIP file formatted input stream, this is the last modification time from the date and time fields of the zip file entry. The default TimeZone is used to convert the standard MS-DOS formatted date and time to the epoch time.

Returns:

The last modification time of the entry in milliseconds since the epoch, or -1 if not specified

See Also:

• setTime(long)
• setLastModifiedTime(FileTime)

setTimeLocal

public void setTimeLocal(LocalDateTime time)

Sets the last modification time of the entry in local date-time.

If the entry is output to a ZIP file or ZIP file formatted output stream the last modification time set by this method will be stored into the date and time fields of the zip file entry and encoded in standard MS-DOS date and time format. If the date-time set is out of the range of the standard MS-DOS date and time format, the time will also be stored into zip file entry's extended timestamp fields in optional extra data in UTC time. The system default TimeZone is used to convert the local date-time to UTC time.

LocalDateTime uses a precision of nanoseconds, whereas this class uses a precision of milliseconds. The conversion will truncate any excess precision information as though the amount in nanoseconds was subject to integer division by one million.

Parameters:

time - The last modification time of the entry in local date-time

Since:

9

See Also:

• getTimeLocal()

getTimeLocal

public LocalDateTime getTimeLocal()

Returns the last modification time of the entry in local date-time.

If the entry is read from a ZIP file or ZIP file formatted input stream, this is the last modification time from the zip file entry's optional extra data if the extended timestamp fields are present. Otherwise, the last modification time is read from entry's standard MS-DOS formatted date and time fields.

The system default TimeZone is used to convert the UTC time to local date-time.

Returns:

The last modification time of the entry in local date-time

Since:

9

See Also:

• setTimeLocal(LocalDateTime)

setLastModifiedTime

public ZipEntry setLastModifiedTime(FileTime time)

Sets the last modification time of the entry.

When output to a ZIP file or ZIP file formatted output stream the last modification time set by this method will be stored into zip file entry's date and time fields in standard MS-DOS date and time format), and the extended timestamp fields in optional extra data in UTC time.

Parameters:

time - The last modification time of the entry

Returns:

This zip entry

Throws:

NullPointerException - if the time is null

Since:

1.8

See Also:

• getLastModifiedTime()

getLastModifiedTime

public FileTime getLastModifiedTime()

Returns the last modification time of the entry.

If the entry is read from a ZIP file or ZIP file formatted input stream, this is the last modification time from the zip file entry's optional extra data if the extended timestamp fields are present. Otherwise the last modification time is read from the entry's date and time fields, the default TimeZone is used to convert the standard MS-DOS formatted date and time to the epoch time.

Returns:

The last modification time of the entry, null if not specified

Since:

1.8

See Also:

• setLastModifiedTime(FileTime)

setLastAccessTime

public ZipEntry setLastAccessTime(FileTime time)

Sets the last access time of the entry.

If set, the last access time will be stored into the extended timestamp fields of entry's optional extra data, when output to a ZIP file or ZIP file formatted stream.

Parameters:

time - The last access time of the entry

Returns:

This zip entry

Throws:

NullPointerException - if the time is null

Since:

1.8

See Also:

• getLastAccessTime()

getLastAccessTime

public FileTime getLastAccessTime()

Returns the last access time of the entry.

The last access time is from the extended timestamp fields of entry's optional extra data when read from a ZIP file or ZIP file formatted stream.

Returns:

The last access time of the entry, null if not specified

Since:

1.8

See Also:

• setLastAccessTime(FileTime)

setCreationTime

public ZipEntry setCreationTime(FileTime time)

Sets the creation time of the entry.

If set, the creation time will be stored into the extended timestamp fields of entry's optional extra data, when output to a ZIP file or ZIP file formatted stream.

Parameters:

time - The creation time of the entry

Returns:

This zip entry

Throws:

NullPointerException - if the time is null

Since:

1.8

See Also:

• getCreationTime()

getCreationTime

public FileTime getCreationTime()

Returns the creation time of the entry.

The creation time is from the extended timestamp fields of entry's optional extra data when read from a ZIP file or ZIP file formatted stream.

Returns:

the creation time of the entry, null if not specified

Since:

1.8

See Also:

• setCreationTime(FileTime)

setSize

public void setSize(long size)

Sets the uncompressed size of the entry data.

Parameters:

size - the uncompressed size in bytes

Throws:

IllegalArgumentException - if the specified size is less than 0, is greater than 0xFFFFFFFF when ZIP64 format is not supported, or is less than 0 when ZIP64 is supported

See Also:

• getSize()

getSize

public long getSize()

Returns the uncompressed size of the entry data.

Returns:

the uncompressed size of the entry data, or -1 if not known

See Also:

• setSize(long)

getCompressedSize

public long getCompressedSize()

Returns the size of the compressed entry data.

In the case of a stored entry, the compressed size will be the same as the uncompressed size of the entry.

Returns:

the size of the compressed entry data, or -1 if not known

See Also:

• setCompressedSize(long)

setCompressedSize

public void setCompressedSize(long csize)

Sets the size of the compressed entry data.

Parameters:

csize - the compressed size to set

See Also:

• getCompressedSize()

setCrc

public void setCrc(long crc)

Sets the CRC-32 checksum of the uncompressed entry data.

Parameters:

crc - the CRC-32 value

Throws:

IllegalArgumentException - if the specified CRC-32 value is less than 0 or greater than 0xFFFFFFFF

See Also:

• getCrc()

getCrc

public long getCrc()

Returns the CRC-32 checksum of the uncompressed entry data.

Returns:

the CRC-32 checksum of the uncompressed entry data, or -1 if not known

See Also:

• setCrc(long)

setMethod

public void setMethod(int method)

Sets the compression method for the entry.

Parameters:

method - the compression method, either STORED or DEFLATED

Throws:

IllegalArgumentException - if the specified compression method is invalid

See Also:

• getMethod()

getMethod

public int getMethod()

Returns the compression method of the entry.

Returns:

the compression method of the entry, or -1 if not specified

See Also:

• setMethod(int)

setExtra

public void setExtra(byte[] extra)

Sets the optional extra field data for the entry.

Invoking this method may change this entry's last modification time, last access time and creation time, if the extra field data includes the extensible timestamp fields, such as NTFS tag 0x0001 or Info-ZIP Extended Timestamp, as specified in Info-ZIP Application Note 970311.

Parameters:

extra - The extra field data bytes

Throws:

IllegalArgumentException - if the length of the specified extra field data is greater than 0xFFFF bytes

See Also:

• getExtra()

getExtra

public byte[] getExtra()

Returns the extra field data for the entry.

Returns:

the extra field data for the entry, or null if none

See Also:

• setExtra(byte[])

setComment

public void setComment(String comment)

Sets the optional comment string for the entry.

ZIP entry comments have maximum length of 0xffff. If the length of the specified comment string is greater than 0xFFFF bytes after encoding, only the first 0xFFFF bytes are output to the ZIP file entry.

Parameters:

comment - the comment string

See Also:

• getComment()

getComment

public String getComment()

Returns the comment string for the entry.

Returns:

the comment string for the entry, or null if none

See Also:

• setComment(String)

isDirectory

public boolean isDirectory()

Returns true if this is a directory entry. A directory entry is defined to be one whose name ends with a '/'.

Returns:

true if this is a directory entry

toString

public String toString()

Returns a string representation of the ZIP entry.

Overrides:

toString in class Object

Returns:

a string representation of the object

hashCode

public int hashCode()

Returns the hash code value for this entry.

Overrides:

hashCode in class Object

Returns:

a hash code value for this object

See Also:

• Object.equals(java.lang.Object)
• System.identityHashCode(java.lang.Object)

clone

public Object clone()

Returns a copy of this entry.

Overrides:

clone in class Object

Returns:

a clone of this instance.

See Also:

• Cloneable