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`

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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.

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Method Summary

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.

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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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Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-java/util/jar/JarInputStream.html

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Referenzen

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Inhaltsverzeichnis Haut

Class JarInputStream

Referenzen