Package java.util.jar

Class JarFile

java.lang.Object

java.util.zip.ZipFile

java.util.jar.JarFile

All Implemented Interfaces:

Closeable, AutoCloseable

public class JarFile
extends ZipFile

JarFile is used to read jar entries and their associated data from jar files.

See Also:

JarInputStream, JarEntry

Field Summary

Fields

Modifier and Type	Field	Description
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 String	MANIFEST_NAME	The MANIFEST file name.

Fields inherited from class java.util.zip.ZipFile

OPEN_DELETE, OPEN_READ

Constructor Summary

Constructors

Constructor	Description
JarFile(File file)	Create a new JarFile using the contents of the specified file.
JarFile(File file, boolean verify)	Create a new JarFile using the contents of the specified file.
JarFile(File file, boolean verify, int mode)	Create a new JarFile using the contents of file.
JarFile(String filename)	Create a new JarFile from the contents of the file specified by filename.
JarFile(String filename, boolean verify)	Create a new JarFile from the contents of the file specified by filename.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes this JarFile.
Enumeration<JarEntry>	entries()	Return an enumeration containing the JarEntrys contained in this JarFile.
ZipEntry	getEntry(String name)	Return the JarEntry specified by name or null if no such entry exists.
InputStream	getInputStream(ZipEntry ze)	Return an InputStream for reading the decompressed contents of ZIP entry.
JarEntry	getJarEntry(String name)	Return the JarEntry specified by its name or null if no such entry exists.
Manifest	getManifest()	Returns the Manifest object associated with this JarFile or null if no MANIFEST entry exists.

Methods inherited from class java.util.zip.ZipFile

finalize, getComment, getName, size

Methods inherited from class java.lang.Object

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

Field Details

MANIFEST_NAME

public static final String MANIFEST_NAME

The MANIFEST file name.

See Also:

Constant Field Values

LOCSIG

static final long LOCSIG

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Constant Field Values

EXTSIG

static final long EXTSIG

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Constant Field Values

CENSIG

static final long CENSIG

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Constant Field Values

ENDSIG

static final long ENDSIG

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Constant Field Values

LOCHDR

static final int LOCHDR

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EXTHDR

static final int EXTHDR

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Constant Field Values

CENHDR

static final int CENHDR

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Constant Field Values

ENDHDR

static final int ENDHDR

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Constant Field Values

LOCVER

static final int LOCVER

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Constant Field Values

LOCFLG

static final int LOCFLG

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Constant Field Values

LOCHOW

static final int LOCHOW

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LOCTIM

static final int LOCTIM

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LOCCRC

static final int LOCCRC

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LOCSIZ

static final int LOCSIZ

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LOCLEN

static final int LOCLEN

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LOCNAM

static final int LOCNAM

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LOCEXT

static final int LOCEXT

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Constant Field Values

EXTCRC

static final int EXTCRC

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Constant Field Values

EXTSIZ

static final int EXTSIZ

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Constant Field Values

EXTLEN

static final int EXTLEN

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Constant Field Values

CENVEM

static final int CENVEM

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Constant Field Values

CENVER

static final int CENVER

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Constant Field Values

CENFLG

static final int CENFLG

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CENHOW

static final int CENHOW

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Constant Field Values

CENTIM

static final int CENTIM

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Constant Field Values

CENCRC

static final int CENCRC

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Constant Field Values

CENSIZ

static final int CENSIZ

See Also:

Constant Field Values

CENLEN

static final int CENLEN

See Also:

Constant Field Values

CENNAM

static final int CENNAM

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CENEXT

static final int CENEXT

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CENCOM

static final int CENCOM

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CENDSK

static final int CENDSK

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CENATT

static final int CENATT

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CENATX

static final int CENATX

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CENOFF

static final int CENOFF

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ENDSUB

static final int ENDSUB

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Constant Field Values

ENDTOT

static final int ENDTOT

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ENDSIZ

static final int ENDSIZ

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ENDOFF

static final int ENDOFF

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Constant Field Values

ENDCOM

static final int ENDCOM

See Also:

Constant Field Values

Constructor Details

JarFile

public JarFile(File file)
        throws IOException

Create a new JarFile using the contents of the specified file.

Parameters:

file - the JAR file as File.

Throws:

IOException - If the file cannot be read.

JarFile

public JarFile(File file,
boolean verify)
        throws IOException

Create a new JarFile using the contents of the specified file.

Parameters:

file - the JAR file as File.

verify - if this JAR file is signed whether it must be verified.

Throws:

IOException - If the file cannot be read.

JarFile

public JarFile(File file,
boolean verify,
int mode)
        throws IOException

Create a new JarFile using the contents of file.

Parameters:

file - the JAR file as File.

verify - if this JAR filed is signed whether it must be verified.

mode - the mode to use, either OPEN_READ or OPEN_DELETE.

Throws:

IOException - If the file cannot be read.

JarFile

public JarFile(String filename)
        throws IOException

Create a new JarFile from the contents of the file specified by filename.

Parameters:

filename - the file name referring to the JAR file.

Throws:

IOException - if file name cannot be opened for reading.

JarFile

public JarFile(String filename,
boolean verify)
        throws IOException

Create a new JarFile from the contents of the file specified by filename.

Parameters:

filename - the file name referring to the JAR file.

verify - if this JAR filed is signed whether it must be verified.

Throws:

IOException - If file cannot be opened or read.

Method Details

entries

public Enumeration<JarEntry> entries()

Return an enumeration containing the JarEntrys contained in this JarFile.

Overrides:

entries in class ZipFile

Returns:

the Enumeration containing the JAR entries.

Throws:

IllegalStateException - if this JarFile is closed.

getJarEntry

public JarEntry getJarEntry(String name)

Return the JarEntry specified by its name or null if no such entry exists.

Parameters:

name - the name of the entry in the JAR file.

Returns:

the JAR entry defined by the name.

getManifest

public Manifest getManifest()
                     throws IOException

Returns the Manifest object associated with this JarFile or null if no MANIFEST entry exists.

Returns:

the MANIFEST.

Throws:

IOException - if an error occurs reading the MANIFEST file.

IllegalStateException - if the jar file is closed.

See Also:

Manifest

getInputStream

public InputStream getInputStream(ZipEntry ze)
                           throws IOException

Return an InputStream for reading the decompressed contents of ZIP entry.

Overrides:

getInputStream in class ZipFile

Parameters:

ze - the ZIP entry to be read.

Returns:

the input stream to read from.

Throws:

IOException - if an error occurred while creating the input stream.

getEntry

public ZipEntry getEntry(String name)

Return the JarEntry specified by name or null if no such entry exists.

Overrides:

getEntry in class ZipFile

Parameters:

name - the name of the entry in the JAR file.

Returns:

the ZIP entry extracted.

close

public void close()
           throws IOException

Closes this JarFile.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class ZipFile

Throws:

IOException - if an error occurs.