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Java 2 Platform SE v1.3.1: Class JarFile
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JavaTM 2 Platform
Std. Ed. v1.3.1
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java.util.jar
Class JarFile

java.lang.Object
  |
  +--java.util.zip.ZipFile
        |
        +--java.util.jar.JarFile
All Implemented Interfaces:
java.util.zip.ZipConstants
public class JarFile
extends ZipFile

The JarFile class is used to read the contents of a JAR file from any file that can be opened with java.io.RandomAccessFile. It extends the class java.util.zip.ZipFile with support for reading an optional Manifest entry. The Manifest can be used to specify meta-information about the JAR file and its entries.

Since:
1.2
See Also:
Manifest, ZipFile, JarEntry

Field Summary
static String MANIFEST_NAME
          The JAR manifest file name.
 
Fields inherited from class java.util.zip.ZipFile
CENATT, CENATX, CENCOM, CENCRC, CENDSK, CENEXT, CENFLG, CENHDR, CENHOW, CENLEN, CENNAM, CENOFF, CENSIG, CENSIZ, CENTIM, CENVEM, CENVER, ENDCOM, ENDHDR, ENDOFF, ENDSIG, ENDSIZ, ENDSUB, ENDTOT, EXTCRC, EXTHDR, EXTLEN, EXTSIG, EXTSIZ, LOCCRC, LOCEXT, LOCFLG, LOCHDR, LOCHOW, LOCLEN, LOCNAM, LOCSIG, LOCSIZ, LOCTIM, LOCVER, OPEN_DELETE, OPEN_READ
 
Constructor Summary
JarFile(File file)
          Creates a new JarFile to read from the specified File object.
JarFile(File file, boolean verify)
          Creates a new JarFile to read from the specified File object.
JarFile(File file, boolean verify, int mode)
          Creates a new JarFile to read from the specified File object in the specified mode.
JarFile(String name)
          Creates a new JarFile to read from the specified file name.
JarFile(String name, boolean verify)
          Creates a new JarFile to read from the specified file name.
 
Method Summary
 Enumeration entries()
          Returns an enumeration of the ZIP file entries.
 ZipEntry getEntry(String name)
          Returns the ZipEntry for the given entry name or null if not found.
 InputStream getInputStream(ZipEntry ze)
          Returns an input stream for reading the contents of the specified ZIP file entry.
 JarEntry getJarEntry(String name)
          Returns the JarEntry for the given entry name or null if not found.
 Manifest getManifest()
          Returns the JAR file manifest, or null if none.
 
Methods inherited from class java.util.zip.ZipFile
close, finalize, getName, size
 
Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

MANIFEST_NAME

public static final String MANIFEST_NAME
The JAR manifest file name.
Constructor Detail

JarFile

public JarFile(String name)
        throws IOException
Creates a new JarFile to read from the specified file name. The JarFile will be verified if it is signed.
Parameters:
name - the name of the JAR file to be opened for reading
Throws:
FileNotFoundException - if the file could not be found
IOException - if an I/O error has occurred

JarFile

public JarFile(String name,
               boolean verify)
        throws IOException
Creates a new JarFile to read from the specified file name.
Parameters:
name - the name of the JAR file to be opened for reading
verify - whether or not to verify the JarFile if it is signed.
Throws:
FileNotFoundException - if the file could not be found
IOException - if an I/O error has occurred

JarFile

public JarFile(File file)
        throws IOException
Creates a new JarFile to read from the specified File object. The JarFile will be verified if it is signed.
Parameters:
file - the JAR file to be opened for reading
Throws:
FileNotFoundException - if the file could not be found
IOException - if an I/O error has occurred

JarFile

public JarFile(File file,
               boolean verify)
        throws IOException
Creates a new JarFile to read from the specified File object.
Parameters:
file - the JAR file to be opened for reading
verify - whether or not to verify the JarFile if it is signed.
Throws:
FileNotFoundException - if the file could not be found
IOException - if an I/O error has occurred

JarFile

public JarFile(File file,
               boolean verify,
               int mode)
        throws IOException
Creates a new JarFile to read from the specified File object in the specified mode. The mode argument must be either OPEN_READ or OPEN_READ | OPEN_DELETE.
Parameters:
file - the JAR file to be opened for reading
verify - whether or not to verify the JarFile if it is signed.
mode - the mode in which the file is to be opened
Throws:
FileNotFoundException - if the file could not be found
IOException - if an I/O error has occurred
IllegalArgumentException - If the mode argument is invalid
Method Detail

getManifest

public Manifest getManifest()
                     throws IOException
Returns the JAR file manifest, or null if none.
Returns:
the JAR file manifest, or null if none

getJarEntry

public JarEntry getJarEntry(String name)
Returns the JarEntry for the given entry name or null if not found.
Parameters:
name - the JAR file entry name
Returns:
the JarEntry for the given entry name or null if not found.
See Also:
JarEntry

getEntry

public ZipEntry getEntry(String name)
Returns the ZipEntry for the given entry name or null if not found.
Overrides:
getEntry in class ZipFile
Parameters:
name - the JAR file entry name
Returns:
the ZipEntry for the given entry name or null if not found
See Also:
ZipEntry

entries

public Enumeration entries()
Returns an enumeration of the ZIP file entries.
Overrides:
entries in class ZipFile
Following copied from class: java.util.zip.ZipFile
Returns:
an enumeration of the ZIP file entries
Throws:
IllegalStateException - if the zip file has been closed

getInputStream

public InputStream getInputStream(ZipEntry ze)
                           throws IOException
Returns an input stream for reading the contents of the specified ZIP file entry.
Overrides:
getInputStream in class ZipFile
Parameters:
ze - the zip file entry
Returns:
an 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
SecurityException - if any of the JarFile entries are incorrectly signed.
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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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