Java™ Platform
Standard Ed. 6

java.util.zip
Class ZipFile

java.lang.Object
  extended by 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
See Also:
Constant Field Values

EXTSIG

public static final long EXTSIG
See Also:
Constant Field Values

CENSIG

public static final long CENSIG
See Also:
Constant Field Values

ENDSIG

public static final long ENDSIG
See Also:
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
See Also:
Constant Field Values

ENDHDR

public static final int ENDHDR
See Also:
Constant Field Values

LOCVER

public static final int LOCVER
See Also:
Constant Field Values

LOCFLG

public static final int LOCFLG
See Also:
Constant Field Values

LOCHOW

public static final int LOCHOW
See Also:
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
See Also:
Constant Field Values

EXTSIZ

public static final int EXTSIZ
See Also:
Constant Field Values

EXTLEN

public static final int EXTLEN
See Also:
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
Since:
1.3
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.

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()

Java™ Platform
Standard Ed. 6

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