JarInputStream (Java Platform SE 8 )

java.lang.Object
- java.io.InputStream
- - java.io.FilterInputStream
  - - java.util.zip.InflaterInputStream
    - - java.util.zip.ZipInputStream
      - java.util.jar.JarInputStream

All Implemented Interfaces:

Closeable, AutoCloseable
```
public class JarInputStream
extends ZipInputStream
```
The JarInputStream class is used to read the contents of a JAR file from any input stream. It extends the class java.util.zip.ZipInputStream with support for reading an optional Manifest entry. The Manifest can be used to store meta-information about the JAR file and its entries.

Since:

1.2

See Also:

Manifest, ZipInputStream

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`

Fields inherited from class java.util.zip.InflaterInputStream
buf, inf, len

Fields inherited from class java.io.FilterInputStream
in

Constructor Summary

Constructors
Constructor and Description
`JarInputStream(InputStream in)` Creates a new `JarInputStream` and reads the optional manifest.
`JarInputStream(InputStream in, boolean verify)` Creates a new `JarInputStream` and reads the optional manifest.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`protected ZipEntry`	`createZipEntry(String name)` Creates a new `JarEntry` (`ZipEntry`) for the specified JAR file entry name.
`Manifest`	`getManifest()` Returns the `Manifest` for this JAR file, or `null` if none.
`ZipEntry`	`getNextEntry()` Reads the next ZIP file entry and positions the stream at the beginning of the entry data.
`JarEntry`	`getNextJarEntry()` Reads the next JAR file entry and positions the stream at the beginning of the entry data.
`int`	`read(byte[] b, int off, int len)` Reads from the current JAR file entry into an array of bytes.

Methods inherited from class java.util.zip.ZipInputStream
available, close, closeEntry, skip

Methods inherited from class java.util.zip.InflaterInputStream
fill, mark, markSupported, read, reset

Methods inherited from class java.io.FilterInputStream
read

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - 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
  - JarInputStream
```
public JarInputStream(InputStream in)
               throws IOException
```
    Creates a new JarInputStream and reads the optional manifest. If a manifest is present, also attempts to verify the signatures if the JarInputStream is signed.
    
    Parameters:
    
    in - the actual input stream
    
    Throws:
    
    IOException - if an I/O error has occurred
  - JarInputStream
```
public JarInputStream(InputStream in,
                      boolean verify)
               throws IOException
```
    Creates a new JarInputStream and reads the optional manifest. If a manifest is present and verify is true, also attempts to verify the signatures if the JarInputStream is signed.
    
    Parameters:
    
    in - the actual input stream
    
    verify - whether or not to verify the JarInputStream if it is signed.
    
    Throws:
    
    IOException - if an I/O error has occurred
- Method Detail
  - getManifest
```
public Manifest getManifest()
```
    Returns the Manifest for this JAR file, or null if none.
    
    Returns:
    
    the Manifest for this JAR file, or null if none.
  - getNextEntry
```
public ZipEntry getNextEntry()
                      throws IOException
```
    Reads the next ZIP file entry and positions the stream at the beginning of the entry data. If verification has been enabled, any invalid signature detected while positioning the stream for the next entry will result in an exception.
    
    Overrides:
    
    getNextEntry in class ZipInputStream
    
    Returns:
    
    the next ZIP file entry, or null if there are no more entries
    
    Throws:
    
    ZipException - if a ZIP file error has occurred
    
    IOException - if an I/O error has occurred
    
    SecurityException - if any of the jar file entries are incorrectly signed.
  - getNextJarEntry
```
public JarEntry getNextJarEntry()
                         throws IOException
```
    Reads the next JAR file entry and positions the stream at the beginning of the entry data. If verification has been enabled, any invalid signature detected while positioning the stream for the next entry will result in an exception.
    
    Returns:
    
    the next JAR file entry, or null if there are no more entries
    
    Throws:
    
    ZipException - if a ZIP file error has occurred
    
    IOException - if an I/O error has occurred
    
    SecurityException - if any of the jar file entries are incorrectly signed.
  - read
```
public int read(byte[] b,
                int off,
                int len)
         throws IOException
```
    Reads from the current JAR file entry into an array of bytes. If len is not zero, the method blocks until some input is available; otherwise, no bytes are read and 0 is returned. If verification has been enabled, any invalid signature on the current entry will be reported at some point before the end of the entry is reached.
    
    Overrides:
    
    read in class ZipInputStream
    
    Parameters:
    
    b - the buffer into which the data is read
    
    off - the start offset in the destination array b
    
    len - the maximum number of bytes to read
    
    Returns:
    
    the actual number of bytes read, or -1 if the end of the entry is reached
    
    Throws:
    
    NullPointerException - If b is null.
    
    IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off
    
    ZipException - if a ZIP file error has occurred
    
    IOException - if an I/O error has occurred
    
    SecurityException - if any of the jar file entries are incorrectly signed.
    
    See Also:
    
    FilterInputStream.in
  - createZipEntry
```
protected ZipEntry createZipEntry(String name)
```
    Creates a new JarEntry (ZipEntry) for the specified JAR file entry name. The manifest attributes of the specified JAR file entry name will be copied to the new JarEntry.
    
    Overrides:
    
    createZipEntry in class ZipInputStream
    
    Parameters:
    
    name - the name of the JAR/ZIP file entry
    
    Returns:
    
    the JarEntry object just created

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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2018, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

Class JarInputStream

Field Summary

Fields inherited from class java.util.zip.InflaterInputStream

Fields inherited from class java.io.FilterInputStream

Constructor Summary

Method Summary

Methods inherited from class java.util.zip.ZipInputStream

Methods inherited from class java.util.zip.InflaterInputStream

Methods inherited from class java.io.FilterInputStream

Methods inherited from class java.lang.Object

Field Detail

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

JarInputStream

JarInputStream

Method Detail

getManifest

getNextEntry

getNextJarEntry

read

createZipEntry