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ZipFile

public class ZipFile
extends Object implements Closeable

java.lang.Object
   ↳ java.util.zip.ZipFile
Known Direct Subclasses


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.

Summary

Constants

int CENATT

int CENATX

int CENCOM

int CENCRC

int CENDSK

int CENEXT

int CENFLG

int CENHDR

int CENHOW

int CENLEN

int CENNAM

int CENOFF

long CENSIG

int CENSIZ

int CENTIM

int CENVEM

int CENVER

int ENDCOM

int ENDHDR

int ENDOFF

long ENDSIG

int ENDSIZ

int ENDSUB

int ENDTOT

int EXTCRC

int EXTHDR

int EXTLEN

long EXTSIG

int EXTSIZ

int LOCCRC

int LOCEXT

int LOCFLG

int LOCHDR

int LOCHOW

int LOCLEN

int LOCNAM

long LOCSIG

int LOCSIZ

int LOCTIM

int LOCVER

int OPEN_DELETE

Mode flag to open a zip file and mark it for deletion.

int OPEN_READ

Mode flag to open a zip file for reading.

Public constructors

ZipFile(String name)

Opens a zip file for reading.

ZipFile(File file, int mode)

Opens a new ZipFile to read from the specified File object in the specified mode.

ZipFile(File file)

Opens a ZIP file for reading given the specified File object.

ZipFile(File file, int mode, Charset charset)

Opens a new ZipFile to read from the specified File object in the specified mode.

ZipFile(String name, Charset charset)

Opens a zip file for reading.

ZipFile(File file, Charset charset)

Opens a ZIP file for reading given the specified File object.

Public methods

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.

Protected methods

void finalize()

Ensures that the system resources held by this ZipFile object are released when there are no more references to it.

Inherited methods

From class java.lang.Object
From interface java.io.Closeable
From interface java.lang.AutoCloseable

Constants

CENATT

Added in API level 21
int CENATT

Constant Value: 36 (0x00000024)

CENATX

Added in API level 21
int CENATX

Constant Value: 38 (0x00000026)

CENCOM

Added in API level 21
int CENCOM

Constant Value: 32 (0x00000020)

CENCRC

Added in API level 21
int CENCRC

Constant Value: 16 (0x00000010)

CENDSK

Added in API level 21
int CENDSK

Constant Value: 34 (0x00000022)

CENEXT

Added in API level 21
int CENEXT

Constant Value: 30 (0x0000001e)

CENFLG

Added in API level 21
int CENFLG

Constant Value: 8 (0x00000008)

CENHDR

Added in API level 21
int CENHDR

Constant Value: 46 (0x0000002e)

CENHOW

Added in API level 21
int CENHOW

Constant Value: 10 (0x0000000a)

CENLEN

Added in API level 21
int CENLEN

Constant Value: 24 (0x00000018)

CENNAM

Added in API level 21
int CENNAM

Constant Value: 28 (0x0000001c)

CENOFF

Added in API level 21
int CENOFF

Constant Value: 42 (0x0000002a)

CENSIG

Added in API level 21
long CENSIG

Constant Value: 33639248 (0x0000000002014b50)

CENSIZ

Added in API level 21
int CENSIZ

Constant Value: 20 (0x00000014)

CENTIM

Added in API level 21
int CENTIM

Constant Value: 12 (0x0000000c)

CENVEM

Added in API level 21
int CENVEM

Constant Value: 4 (0x00000004)

CENVER

Added in API level 21
int CENVER

Constant Value: 6 (0x00000006)

ENDCOM

Added in API level 21
int ENDCOM

Constant Value: 20 (0x00000014)

ENDHDR

Added in API level 21
int ENDHDR

Constant Value: 22 (0x00000016)

ENDOFF

Added in API level 21
int ENDOFF

Constant Value: 16 (0x00000010)

ENDSIG

Added in API level 21
long ENDSIG

Constant Value: 101010256 (0x0000000006054b50)

ENDSIZ

Added in API level 21
int ENDSIZ

Constant Value: 12 (0x0000000c)

ENDSUB

Added in API level 21
int ENDSUB

Constant Value: 8 (0x00000008)

ENDTOT

Added in API level 21
int ENDTOT

Constant Value: 10 (0x0000000a)

EXTCRC

Added in API level 21
int EXTCRC

Constant Value: 4 (0x00000004)

EXTHDR

Added in API level 21
int EXTHDR

Constant Value: 16 (0x00000010)

EXTLEN

Added in API level 21
int EXTLEN

Constant Value: 12 (0x0000000c)

EXTSIG

Added in API level 21
long EXTSIG

Constant Value: 134695760 (0x0000000008074b50)

EXTSIZ

Added in API level 21
int EXTSIZ

Constant Value: 8 (0x00000008)

LOCCRC

Added in API level 21
int LOCCRC

Constant Value: 14 (0x0000000e)

LOCEXT

Added in API level 21
int LOCEXT

Constant Value: 28 (0x0000001c)

LOCFLG

Added in API level 21
int LOCFLG

Constant Value: 6 (0x00000006)

LOCHDR

Added in API level 21
int LOCHDR

Constant Value: 30 (0x0000001e)

LOCHOW

Added in API level 21
int LOCHOW

Constant Value: 8 (0x00000008)

LOCLEN

Added in API level 21
int LOCLEN

Constant Value: 22 (0x00000016)

LOCNAM

Added in API level 21
int LOCNAM

Constant Value: 26 (0x0000001a)

LOCSIG

Added in API level 21
long LOCSIG

Constant Value: 67324752 (0x0000000004034b50)

LOCSIZ

Added in API level 21
int LOCSIZ

Constant Value: 18 (0x00000012)

LOCTIM

Added in API level 21
int LOCTIM

Constant Value: 10 (0x0000000a)

LOCVER

Added in API level 21
int LOCVER

Constant Value: 4 (0x00000004)

OPEN_DELETE

Added in API level 1
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.

Constant Value: 4 (0x00000004)

OPEN_READ

Added in API level 1
int OPEN_READ

Mode flag to open a zip file for reading.

Constant Value: 1 (0x00000001)

Public constructors

ZipFile

Added in API level 1
ZipFile (String name)

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 String: 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

Added in API level 1
ZipFile (File file, 
                int mode)

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 File: the ZIP file to be opened for reading
mode int: 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

See also:

ZipFile

Added in API level 1
ZipFile (File file)

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 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

Added in API level 24
ZipFile (File file, 
                int mode, 
                Charset charset)

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 File: the ZIP file to be opened for reading
mode int: the mode in which the file is to be opened
charset 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

See also:

ZipFile

Added in API level 24
ZipFile (String name, 
                Charset charset)

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 String: the name of the zip file
charset 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

See also:

ZipFile

Added in API level 24
ZipFile (File file, 
                Charset charset)

Opens a ZIP file for reading given the specified File object.

Parameters
file File: the ZIP file to be opened for reading
charset 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

Public methods

close

Added in API level 1
void close ()

Closes the ZIP file.

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

Throws
IOException if an I/O error has occurred

entries

Added in API level 1
Enumeration<? extends ZipEntry> entries ()

Returns an enumeration of the ZIP file entries.

Returns
Enumeration<? extends ZipEntry> an enumeration of the ZIP file entries
Throws
IllegalStateException if the zip file has been closed

getComment

Added in API level 19
String getComment ()

Returns the zip file comment, or null if none.

Returns
String the comment string for the zip file, or null if none
Throws
IllegalStateException if the zip file has been closed Since 1.7

getEntry

Added in API level 1
ZipEntry getEntry (String name)

Returns the zip file entry for the specified name, or null if not found.

Parameters
name String: the name of the entry
Returns
ZipEntry the zip file entry, or null if not found
Throws
IllegalStateException if the zip file has been closed

getInputStream

Added in API level 1
InputStream getInputStream (ZipEntry entry)

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.

Parameters
entry ZipEntry: the zip file entry
Returns
InputStream the input stream for reading the contents of the specified zip file entry.
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

Added in API level 1
String getName ()

Returns the path name of the ZIP file.

Returns
String the path name of the ZIP file

size

Added in API level 1
int size ()

Returns the number of entries in the ZIP file.

Returns
int the number of entries in the ZIP file
Throws
IllegalStateException if the zip file has been closed

Protected methods

finalize

Added in API level 1
void finalize ()

Ensures that the system resources held by this ZipFile object are released when there are no more references to it.

Since the time when GC would invoke this method is undetermined, it is strongly recommended that applications invoke the close method as soon they have finished accessing this ZipFile. This will prevent holding up system resources for an undetermined length of time.

Throws
IOException if an I/O error has occurred

See also:

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