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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.

  See Also:
    Constant Field Values

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:
  `IOException` - if an I/O error has occurred
  `SecurityException` - if access to the file is denied by the SecurityManager

### 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:
  `IOException` - if an I/O error has occurred
  `SecurityException` - if access to the file is denied by the SecurityManager

### 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:
  `IOException` - if an I/O error has occurred
  `SecurityException` - if access to the file is denied by the SecurityManager

### 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:
  `IOException` - if an I/O error has occurred
  `SecurityException` - if access to the file is denied by the SecurityManager.

### 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:
  `IOException` - if an I/O error has occurred
  `IllegalArgumentException` - If the `mode` argument is invalid
  `SecurityException` - if access to the file is denied by the SecurityManager

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
    `IOException`

### 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`
  Returns:
    an enumeration of the ZIP file entries

### 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.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.