JarFile (Java Platform SE 8 )

java.lang.Object
- java.util.zip.ZipFile
- - java.util.jar.JarFile

All Implemented Interfaces:

Closeable, AutoCloseable
```
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.
Unless otherwise noted, passing a null argument to a constructor or method in this class will cause a NullPointerException to be thrown. If the verify flag is on when opening a signed jar file, the content of the file is verified against its signature embedded inside the file. Please note that the verification process does not include validating the signer's certificate. A caller should inspect the return value of JarEntry.getCodeSigners() to further determine if the signature can be trusted.

Since:

1.2

See Also:

Manifest, ZipFile, JarEntry

Field Summary

Fields
Modifier and Type	Field and 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 JAR manifest file name.

Fields inherited from class java.util.zip.ZipFile
OPEN_DELETE, OPEN_READ

Constructor Summary

Constructors
Constructor and Description
`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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Enumeration<JarEntry>`	`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.
`Stream<JarEntry>`	`stream()` Return an ordered `Stream` over the ZIP file entries.

Methods inherited from class java.util.zip.ZipFile
close, finalize, getComment, 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
  - 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
  - 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 jar file 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 jar file 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 jar file 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
    
    Since:
    
    1.3
- 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
    
    Throws:
    
    IllegalStateException - may be thrown if the jar file has been closed
    
    IOException - if an I/O error has occurred
  - 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.
    
    Throws:
    
    IllegalStateException - may be thrown if the jar file has been closed
    
    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
    
    Throws:
    
    IllegalStateException - may be thrown if the jar file has been closed
    
    See Also:
    
    ZipEntry
  - entries
```
public Enumeration<JarEntry> entries()
```
    Returns an enumeration of the zip file entries.
    
    Overrides:
    
    entries in class ZipFile
    
    Returns:
    
    an enumeration of the ZIP file entries
  - stream
```
public Stream<JarEntry> stream()
```
    Description copied from class: ZipFile
    
    Return an ordered Stream over the ZIP file entries. Entries appear in the Stream in the order they appear in the central directory of the ZIP file.
    
    Overrides:
    
    stream in class ZipFile
    
    Returns:
    
    an ordered Stream of entries in this ZIP file
  - 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 file format error has occurred
    
    IOException - if an I/O error has occurred
    
    SecurityException - if any of the jar file entries are incorrectly signed.
    
    IllegalStateException - may be thrown if the jar file has been closed

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Class JarFile

Field Summary

Fields inherited from class java.util.zip.ZipFile

Constructor Summary

Method Summary

Methods inherited from class java.util.zip.ZipFile

Methods inherited from class java.lang.Object

Field Detail

MANIFEST_NAME

LOCSIG

EXTSIG

CENSIG

ENDSIG

LOCHDR

EXTHDR

CENHDR

ENDHDR

LOCVER

LOCFLG

LOCHOW

LOCTIM

LOCCRC

LOCSIZ

LOCLEN

LOCNAM

LOCEXT

EXTCRC

EXTSIZ

EXTLEN

CENVEM

CENVER

CENFLG

CENHOW

CENTIM

CENCRC

CENSIZ

CENLEN

CENNAM

CENEXT

CENCOM

CENDSK

CENATT

CENATX

CENOFF

ENDSUB

ENDTOT

ENDSIZ

ENDOFF

ENDCOM

Constructor Detail

JarFile

JarFile

JarFile

JarFile

JarFile

Method Detail

getManifest

getJarEntry

getEntry

entries

stream

getInputStream