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/OpenJDK 21

Class ZipFile

java.lang.Object
java.util.zip.ZipFile
All Implemented Interfaces:
Closeable, AutoCloseable
Direct Known Subclasses:
JarFile
public class ZipFile extends Object implements Closeable
This class is used to read entries from a zip file.

Unless otherwise noted, passing a null argument to a constructor or method in this class will cause a NullPointerException to be thrown.

API Note:
To release resources used by this ZipFile, the close() method should be called explicitly or by try-with-resources. Subclasses are responsible for the cleanup of resources acquired by the subclass. Subclasses that override Object.finalize() in order to perform cleanup should be modified to use alternative cleanup mechanisms such as Cleaner and remove the overriding finalize method.
Since:
1.1

Field Summary

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 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 OPEN_DELETE
Mode flag to open a zip file and mark it for deletion.
static final int OPEN_READ
Mode flag to open a zip file for reading.

Constructor Summary

Constructor Description
ZipFile(File file)
Opens a ZIP file for reading given the specified File object.
ZipFile(File file, int mode)
Opens a new ZipFile to read from the specified File object in the specified mode.
ZipFile(File file, int mode, Charset charset)
Opens a new ZipFile to read from the specified File object in the specified mode.
ZipFile(File file, Charset charset)
Opens a ZIP file for reading given the specified File object.
ZipFile(String name)
Opens a zip file for reading.
ZipFile(String name, Charset charset)
Opens a zip file for reading.

Method Summary

Modifier and Type Method Description
void close()
Closes the ZIP file.
Enumeration<? extends ZipEntry> entries()
Returns an enumeration of the ZIP file entries.
String getComment()
Returns the zip file comment, or null if none.
ZipEntry getEntry(String name)
Returns the zip file entry for the specified name, or null if not found.
InputStream getInputStream(ZipEntry entry)
Returns an input stream for reading the contents of the specified zip file entry.
String getName()
Returns the path name of the ZIP file.
int size()
Returns the number of entries in the ZIP file.
Stream<? extends ZipEntry> stream()
Returns an ordered Stream over the ZIP file entries.

Methods declared in class java.lang.Object

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

Field Details

OPEN_READ

public static final int OPEN_READ
Mode flag to open a zip file for reading.
See Also:

OPEN_DELETE

public static final int OPEN_DELETE
Mode flag to open a zip file and mark it for deletion. The file will be deleted some time between the moment that it is opened and the moment that it is closed, but its contents will remain accessible via the ZipFile object until either the close method is invoked or the virtual machine exits.
See Also:

LOCSIG

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

EXTSIG

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

CENSIG

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

ENDSIG

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

LOCHDR

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

EXTHDR

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

CENHDR

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

ENDHDR

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

LOCVER

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

LOCFLG

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

LOCHOW

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

LOCTIM

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

LOCCRC

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

LOCSIZ

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

LOCLEN

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

LOCNAM

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

LOCEXT

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

EXTCRC

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

EXTSIZ

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

EXTLEN

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

CENVEM

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

CENVER

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

CENFLG

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

CENHOW

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

CENTIM

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

CENCRC

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

CENSIZ

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

CENLEN

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

CENNAM

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

CENEXT

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

CENCOM

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

CENDSK

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

CENATT

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

CENATX

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

CENOFF

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

ENDSUB

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

ENDTOT

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

ENDSIZ

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

ENDOFF

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

ENDCOM

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

Constructor Details

ZipFile

public ZipFile(String name) throws IOException
Opens a zip file for reading.

First, if there is a security manager, its checkRead method is called with the name argument as its argument to ensure the read is allowed.

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

Parameters:
name - the name of the zip file
Throws:
ZipException - if a ZIP format error has occurred
IOException - if an I/O error has occurred
SecurityException - if a security manager exists and its checkRead method doesn't allow read access to the file.
See Also:

ZipFile

public ZipFile(File file, int mode) throws IOException
Opens a new ZipFile to read from the specified File object in the specified mode. The mode argument must be either OPEN_READ or OPEN_READ | OPEN_DELETE.

First, if there is a security manager, its checkRead method is called with the name argument as its argument to ensure the read is allowed.

The UTF-8 charset is used to decode the entry names and comments

Parameters:
file - the ZIP file to be opened for reading
mode - the mode in which the file is to be opened
Throws:
ZipException - if a ZIP format error has occurred
IOException - if an I/O error has occurred
SecurityException - if a security manager exists and its checkRead method doesn't allow read access to the file, or its checkDelete method doesn't allow deleting the file when the OPEN_DELETE flag is set.
IllegalArgumentException - if the mode argument is invalid
Since:
1.3
See Also:

ZipFile

public ZipFile(File file) throws ZipException, IOException
Opens a ZIP file for reading given the specified File object.

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

Parameters:
file - the ZIP file to be opened for reading
Throws:
ZipException - if a ZIP format error has occurred
IOException - if an I/O error has occurred

ZipFile

public ZipFile(File file, int mode, Charset charset) throws IOException
Opens a new ZipFile to read from the specified File object in the specified mode. The mode argument must be either OPEN_READ or OPEN_READ | OPEN_DELETE.

First, if there is a security manager, its checkRead method is called with the name argument as its argument to ensure the read is allowed.

Parameters:
file - the ZIP file to be opened for reading
mode - the mode in which the file is to be opened
charset - the charset to be used to decode the ZIP entry name and comment that are not encoded by using UTF-8 encoding (indicated by entry's general purpose flag).
Throws:
ZipException - if a ZIP format error has occurred
IOException - if an I/O error has occurred
SecurityException - if a security manager exists and its checkRead method doesn't allow read access to the file, or its checkDelete method doesn't allow deleting the file when the OPEN_DELETE flag is set
IllegalArgumentException - if the mode argument is invalid
Since:
1.7
See Also:

ZipFile

public ZipFile(String name, Charset charset) throws IOException
Opens a zip file for reading.

First, if there is a security manager, its checkRead method is called with the name argument as its argument to ensure the read is allowed.

Parameters:
name - the name of the zip file
charset - the charset to be used to decode the ZIP entry name and comment that are not encoded by using UTF-8 encoding (indicated by entry's general purpose flag).
Throws:
ZipException - if a ZIP format error has occurred
IOException - if an I/O error has occurred
SecurityException - if a security manager exists and its checkRead method doesn't allow read access to the file
Since:
1.7
See Also:

ZipFile

public ZipFile(File file, Charset charset) throws IOException
Opens a ZIP file for reading given the specified File object.
Parameters:
file - the ZIP file to be opened for reading
charset - The charset to be used to decode the ZIP entry name and comment (ignored if the language encoding bit of the ZIP entry's general purpose bit flag is set).
Throws:
ZipException - if a ZIP format error has occurred
IOException - if an I/O error has occurred
Since:
1.7

Method Details

getComment

public String getComment()
Returns the zip file comment, or null if none.
Returns:
the comment string for the zip file, or null if none
Throws:
IllegalStateException - if the zip file has been closed
Since:
1.7

getEntry

public ZipEntry getEntry(String name)
Returns the zip file entry for the specified name, or null if not found.
Parameters:
name - the name of the entry
Returns:
the zip file entry, or null if not found
Throws:
IllegalStateException - if the zip file has been closed

getInputStream

public InputStream getInputStream(ZipEntry entry) throws IOException
Returns an input stream for reading the contents of the specified zip file entry.

Closing this ZIP file will, in turn, close all input streams that have been returned by invocations of this method.

API Note:
The InputStream returned by this method can wrap an InflaterInputStream, whose read(byte[], int, int) method can modify any element of the output buffer.
Parameters:
entry - the zip file entry
Returns:
the input stream for reading the contents of the specified zip file entry or null if the zip file entry does not exist within the zip file.
Throws:
ZipException - if a ZIP format error has occurred
IOException - if an I/O error has occurred
IllegalStateException - if the zip file has been closed

getName

public String getName()
Returns the path name of the ZIP file.
Returns:
the path name of the ZIP file

entries

public Enumeration<? extends ZipEntry> entries()
Returns an enumeration of the ZIP file entries.
Returns:
an enumeration of the ZIP file entries
Throws:
IllegalStateException - if the zip file has been closed

stream

public Stream<? extends ZipEntry> stream()
Returns an ordered Stream over the ZIP file entries. Entries appear in the Stream in the order they appear in the central directory of the ZIP file.
Returns:
an ordered Stream of entries in this ZIP file
Throws:
IllegalStateException - if the zip file has been closed
Since:
1.8

size

public int size()
Returns the number of entries in the ZIP file.
Returns:
the number of entries in the ZIP file
Throws:
IllegalStateException - if the zip file has been closed

close

public void close() throws IOException
Closes the ZIP file.

Closing this ZIP file will close all of the input streams previously returned by invocations of the getInputStream method.

Specified by:
close in interface AutoCloseable
Specified by:
close in interface Closeable
Throws:
IOException - if an I/O error has occurred

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/zip/ZipFile.html