public abstract class JarURLConnection extends URLConnection
The syntax of a JAR URL is:
jar:<url>!/{entry}
for example:
jar:http://www.foo.com/bar/baz.jar!/COM/foo/Quux.class
Jar URLs should be used to refer to a JAR file or entries in a JAR file. The example above is a JAR URL which refers to a JAR entry. If the entry name is omitted, the URL refers to the whole JAR file: jar:http://www.foo.com/bar/baz.jar!/
Users should cast the generic URLConnection to a JarURLConnection when they know that the URL they created is a JAR URL, and they need JAR-specific functionality. For example:
URL url = new URL("jar:file:/home/duke/duke.jar!/"); JarURLConnection jarConnection = (JarURLConnection)url.openConnection(); Manifest manifest = jarConnection.getManifest();
JarURLConnection instances can only be used to read from JAR files. It is not possible to get a OutputStream
to modify or write to the underlying JAR file using this class.
Examples:
jar:http://www.foo.com/bar/baz.jar!/COM/foo/Quux.class
jar:http://www.foo.com/bar/baz.jar!/
jar:http://www.foo.com/bar/baz.jar!/COM/foo/
!/
is referred to as the separator.
When constructing a JAR url via new URL(context, spec)
, the following rules apply:
Examples:
Modifier and Type | Field | Description |
---|---|---|
protected URLConnection |
jarFileURLConnection |
The connection to the JAR file URL, if the connection has been initiated. |
allowUserInteraction, connected, doInput, doOutput, ifModifiedSince, url, useCaches
Modifier | Constructor | Description |
---|---|---|
protected |
Creates the new JarURLConnection to the specified URL. |
Modifier and Type | Method | Description |
---|---|---|
Attributes |
getAttributes() |
Return the Attributes object for this connection if the URL for it points to a JAR file entry, null otherwise. |
Certificate[] |
getCertificates() |
Returns the Certificate objects for this connection if the URL for it points to a JAR file entry, null otherwise. |
String |
getEntryName() |
Return the entry name for this connection. |
JarEntry |
getJarEntry() |
Return the JAR entry object for this connection, if any. |
abstract JarFile |
getJarFile() |
Return the JAR file for this connection. |
URL |
getJarFileURL() |
Returns the URL for the Jar file for this connection. |
Attributes |
getMainAttributes() |
Returns the main Attributes for the JAR file for this connection. |
Manifest |
getManifest() |
Returns the Manifest for this connection, or null if none. |
addRequestProperty, connect, getAllowUserInteraction, getConnectTimeout, getContent, getContent, getContentEncoding, getContentLength, getContentLengthLong, getContentType, getDate, getDefaultAllowUserInteraction, getDefaultRequestProperty, getDefaultUseCaches, getDefaultUseCaches, getDoInput, getDoOutput, getExpiration, getFileNameMap, getHeaderField, getHeaderField, getHeaderFieldDate, getHeaderFieldInt, getHeaderFieldKey, getHeaderFieldLong, getHeaderFields, getIfModifiedSince, getInputStream, getLastModified, getOutputStream, getPermission, getReadTimeout, getRequestProperties, getRequestProperty, getURL, getUseCaches, guessContentTypeFromName, guessContentTypeFromStream, setAllowUserInteraction, setConnectTimeout, setContentHandlerFactory, setDefaultAllowUserInteraction, setDefaultRequestProperty, setDefaultUseCaches, setDefaultUseCaches, setDoInput, setDoOutput, setFileNameMap, setIfModifiedSince, setReadTimeout, setRequestProperty, setUseCaches, toString
protected URLConnection jarFileURLConnection
protected JarURLConnection(URL url) throws MalformedURLException
url
- the URLMalformedURLException
- if no legal protocol could be found in a specification string or the string could not be parsed.public URL getJarFileURL()
public String getEntryName()
public abstract JarFile getJarFile() throws IOException
IOException
- if an IOException occurs while trying to connect to the JAR file for this connection.public Manifest getManifest() throws IOException
IOException
- if getting the JAR file for this connection causes an IOException to be thrown.public JarEntry getJarEntry() throws IOException
IOException
- if getting the JAR file for this connection causes an IOException to be thrown.public Attributes getAttributes() throws IOException
IOException
- if getting the JAR entry causes an IOException to be thrown.public Attributes getMainAttributes() throws IOException
IOException
- if getting the manifest causes an IOException to be thrown.public Certificate[] getCertificates() throws IOException
null
IOException
- if getting the JAR entry causes an IOException to be thrown.
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/net/JarURLConnection.html