API java : ZipFile

java.util.zip
Class ZipFile

java.lang.Object
  java.util.zip.ZipFile

Direct Known Subclasses:

JarFile

public class ZipFile
extends Object

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.

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

 

Constructor Summary
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(String name)           Opens a zip file for reading.

 

Method Summary
void	close()           Closes the ZIP file.
Enumeration<? extends ZipEntry>	entries()           Returns an enumeration of the ZIP file entries.
protected  void	finalize()           Ensures that the close method of this ZIP file is called when there are no more references to it.
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.

 

Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

OPEN_READ

public static final int OPEN_READ

Mode flag to open a zip file for reading.

See Also:

Constant Field Values

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:

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

See Also:

Constant Field Values

EXTHDR

public static final int EXTHDR

See Also:

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

See Also:

Constant Field Values

LOCCRC

public static final int LOCCRC

See Also:

Constant Field Values

LOCSIZ

public static final int LOCSIZ

See Also:

Constant Field Values

LOCLEN

public static final int LOCLEN

See Also:

Constant Field Values

LOCNAM

public static final int LOCNAM

See Also:

Constant Field Values

LOCEXT

public static final int LOCEXT

See Also:

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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Constant Field Values

EXTLEN

public static final int EXTLEN

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Constant Field Values

CENVEM

public static final int CENVEM

See Also:

Constant Field Values

CENVER

public static final int CENVER

See Also:

Constant Field Values

CENFLG

public static final int CENFLG

See Also:

Constant Field Values

CENHOW

public static final int CENHOW

See Also:

Constant Field Values

CENTIM

public static final int CENTIM

See Also:

Constant Field Values

CENCRC

public static final int CENCRC

See Also:

Constant Field Values

CENSIZ

public static final int CENSIZ

See Also:

Constant Field Values

CENLEN

public static final int CENLEN

See Also:

Constant Field Values

CENNAM

public static final int CENNAM

See Also:

Constant Field Values

CENEXT

public static final int CENEXT

See Also:

Constant Field Values

CENCOM

public static final int CENCOM

See Also:

Constant Field Values

CENDSK

public static final int CENDSK

See Also:

Constant Field Values

CENATT

public static final int CENATT

See Also:

Constant Field Values

CENATX

public static final int CENATX

See Also:

Constant Field Values

CENOFF

public static final int CENOFF

See Also:

Constant Field Values

ENDSUB

public static final int ENDSUB

See Also:

Constant Field Values

ENDTOT

public static final int ENDTOT

See Also:

Constant Field Values

ENDSIZ

public static final int ENDSIZ

See Also:

Constant Field Values

ENDOFF

public static final int ENDOFF

See Also:

Constant Field Values

ENDCOM

public static final int ENDCOM

See Also:

Constant Field Values

Constructor Detail

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.

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:

SecurityManager.checkRead(java.lang.String)

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.

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

See Also:

SecurityManager.checkRead(java.lang.String)

ZipFile

public ZipFile(File file)
        throws ZipException,
               IOException

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

Parameters:

file - the ZIP file to be opened for reading

Throws:

ZipException - if a ZIP error has occurred

IOException - if an I/O error has occurred

Method Detail

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. 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 - the zip file entry

Returns:

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

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

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.

Throws:

IOException - if an I/O error has occurred

finalize

protected void finalize()
                 throws IOException

Ensures that the close method of this ZIP file is called 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.

Overrides:

finalize in class Object

Throws:

IOException - if an I/O error has occurred

See Also:

close()

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