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 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 declared in class java.util.zip.InflaterInputStream
buf, inf, len
Fields declared in class java.io.FilterInputStream
in
-
Constructor Summary
Constructors Constructor Description JarInputStream(InputStream in)
Creates a newJarInputStream
and reads the optional manifest.JarInputStream(InputStream in, boolean verify)
Creates a newJarInputStream
and reads the optional manifest. -
Method Summary
Modifier and Type Method Description protected ZipEntry
createZipEntry(String name)
Creates a newJarEntry
(ZipEntry
) for the specified JAR file entry name.Manifest
getManifest()
Returns theManifest
for this JAR file, ornull
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 declared in class java.util.zip.ZipInputStream
available, close, closeEntry, skip
Methods declared in class java.util.zip.InflaterInputStream
fill, mark, markSupported, read, reset
Methods declared in class java.io.FilterInputStream
read
Methods declared in class java.io.InputStream
nullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo
-
Field Details
-
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 Details
-
JarInputStream
Creates a newJarInputStream
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
Creates a newJarInputStream
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 streamverify
- whether or not to verify the JarInputStream if it is signed.- Throws:
IOException
- if an I/O error has occurred
-
-
Method Details
-
getManifest
Returns theManifest
for this JAR file, ornull
if none.- Returns:
- the
Manifest
for this JAR file, ornull
if none.
-
getNextEntry
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 classZipInputStream
- Returns:
- the next ZIP file entry, or null if there are no more entries
- Throws:
ZipException
- if a ZIP file error has occurredIOException
- if an I/O error has occurredSecurityException
- if any of the jar file entries are incorrectly signed.
-
getNextJarEntry
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 occurredIOException
- if an I/O error has occurredSecurityException
- if any of the jar file entries are incorrectly signed.
-
read
Reads from the current JAR file entry into an array of bytes. Iflen
is not zero, the method blocks until some input is available; otherwise, no bytes are read and0
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 classZipInputStream
- Parameters:
b
- the buffer into which the data is readoff
- the start offset in the destination arrayb
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
- Ifb
isnull
.IndexOutOfBoundsException
- Ifoff
is negative,len
is negative, orlen
is greater thanb.length - off
ZipException
- if a ZIP file error has occurredIOException
- if an I/O error has occurredSecurityException
- if any of the jar file entries are incorrectly signed.- See Also:
FilterInputStream.in
-
createZipEntry
Creates a newJarEntry
(ZipEntry
) for the specified JAR file entry name. The manifest attributes of the specified JAR file entry name will be copied to the newJarEntry
.- Overrides:
createZipEntry
in classZipInputStream
- Parameters:
name
- the name of the JAR/ZIP file entry- Returns:
- the
JarEntry
object just created
-