Examples of java.net.JarURLConnection

java.net.JarURLConnection
oo.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 {@link java.io.OutputStream} to modify or write to the underlying JAR file using this class.
Examples:

A Jar entry
jar:http://www.foo.com/bar/baz.jar!/COM/foo/Quux.class
A Jar file
jar:http://www.foo.com/bar/baz.jar!/
A Jar directory
jar:http://www.foo.com/bar/baz.jar!/COM/foo/

!/ is refered to as the separator.
When constructing a JAR url via new URL(context, spec), the following rules apply:
- if there is no context URL and the specification passed to the URL constructor doesn't contain a separator, the URL is considered to refer to a JarFile.
- if there is a context URL, the context URL is assumed to refer to a JAR file or a Jar directory.
- if the specification begins with a '/', the Jar directory is ignored, and the spec is considered to be at the root of the Jar file.
  Examples:
  
  context: jar:http://www.foo.com/bar/jar.jar!/, spec:baz/entry.txt
  url:jar:http://www.foo.com/bar/jar.jar!/baz/entry.txt
  context: jar:http://www.foo.com/bar/jar.jar!/baz, spec:entry.txt
  url:jar:http://www.foo.com/bar/jar.jar!/baz/entry.txt
  context: jar:http://www.foo.com/bar/jar.jar!/baz, spec:/entry.txt
  url:jar:http://www.foo.com/bar/jar.jar!/entry.txt
@see java.net.URL @see java.net.URLConnection @see java.util.jar.JarFile @see java.util.jar.JarInputStream @see java.util.jar.Manifest @see java.util.zip.ZipEntry @author Benjamin Renaud @since 1.2

        if (!docBase.mkdir()) {
            throw new IllegalStateException(String.format("Unable to create directory: %s", docBase.getAbsolutePath()));
        }


        // Expand the jar into the new document base directory
        JarURLConnection juc = (JarURLConnection) jar.openConnection();
        juc.setUseCaches(false);
        JarFile jarFile = null;
        InputStream input = null;
        try {
            jarFile = juc.getJarFile();
            Enumeration<JarEntry> jarEntries = jarFile.entries();
            while (jarEntries.hasMoreElements()) {
                JarEntry jarEntry = jarEntries.nextElement();
                String name = jarEntry.getName();
                int last = name.lastIndexOf('/');

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                if ("zip".equals(resourceUrl.getProtocol())) {
                    url = url.replaceAll("zip:", "jar:file:");
                }
                final URL jarUrl = new URL(url);


                final JarURLConnection connection = (JarURLConnection) jarUrl.openConnection();
                final JarFile jarFile = connection.getJarFile();
                String blockName = jarFile.getManifest().getMainAttributes().getValue("Cocoon-Block-Name");
                if (blockName == null) {
                    String jarPath = jarFile.getName();
                    // extract jar name
                    String jarName = jarPath.substring(jarPath.lastIndexOf(File.separatorChar) + 1);

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                // "jar:{url-to-jar}!/{resource-path}"
                // to open the jar, we can simply remove everything after "!/"
                int pos = url.indexOf('!');
                url = url.substring(0, pos + 2); // +2 as we include "!/"
                final URL jarUrl = new URL(url);
                final JarURLConnection connection = (JarURLConnection) jarUrl.openConnection();
                final JarFile jarFile = connection.getJarFile();
                deploy(jarFile, pattern, destinationDirectory);
            }
        }
    }

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      }
  } else {
      try {
    // It does not work with the filesystem: we must
    // be in the case of a package contained in a jar file.
    JarURLConnection conn = (JarURLConnection)url.openConnection();
    String starts = conn.getEntryName();
    JarFile jfile = conn.getJarFile();
    Enumeration e = jfile.entries();
    while (e.hasMoreElements()) {
        ZipEntry entry = (ZipEntry)e.nextElement();
        String entryname = entry.getName();
        if (entryname.startsWith(starts)

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        @Override
        protected URLConnection openConnection(URL u) throws IOException
        {
            return new JarURLConnection(u)
            {
                @Override
                public JarFile getJarFile() throws IOException
                {
                    BundleRevisionImpl revision = (BundleRevisionImpl) m_revision.get();

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        "resources/install.oak/sub/five.jar"
    };
    
    private ClassLoader mockClassLoader(String ... paths) throws MalformedURLException, IOException {
        final ClassLoader cl = Mockito.mock(ClassLoader.class);
        final JarURLConnection conn = Mockito.mock(JarURLConnection.class);
        final URLStreamHandler handler = new URLStreamHandler() {
            @Override
            protected URLConnection openConnection(final URL url) throws IOException {
                if(throwExceptionOnOpenConnection) {
                    throw new IOException("Throwing up for testing that");
                }
                return conn;
            }
        };
        final JarFile f = Mockito.mock(JarFile.class);
        final URL url = new URL("jar://some.jar", "localhost", 1234, "some.jar", handler);
        
        final Vector<JarEntry> entries = new Vector<JarEntry>();
        for(String path : paths) {
            entries.add(new JarEntry(path));
        }
        
        when(cl.getResource(Matchers.contains("install"))).thenReturn(url);
        when(conn.getJarFile()).thenReturn(f);
        when(f.entries()).thenReturn(entries.elements());
        
        return cl;
    }

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                }
            } else {
                // Tag library is packaged in JAR file
                try {
                    URL jarFileUrl = new URL("jar:" + location[0] + "!/");
                    JarURLConnection conn = (JarURLConnection) jarFileUrl
                            .openConnection();
                    conn.setUseCaches(false);
                    conn.connect();
                    jarFile = conn.getJarFile();
                    ZipEntry jarEntry = jarFile.getEntry(location[1]);
                    in = jarFile.getInputStream(jarEntry);
                    parseTLD(ctxt, location[0], in, jarFileUrl);
                } catch (Exception ex) {
                    err.jspError("jsp.error.tld.unable_to_read", location[0],

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                        try {
                            URLConnection urlConnection = url.openConnection();
                            urlConnection.setUseCaches(false);


                            if (urlConnection instanceof JarURLConnection) {
                                JarURLConnection jarUrlConnection = (JarURLConnection) urlConnection;
                                return jarUrlConnection.getManifest();
                            } else {
                                jis = new JarInputStream(urlConnection.getInputStream());
                                return jis.getManifest();
                            }
                        } catch (IOException e) {

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                        ignoredPackages);
            } catch (URISyntaxException e) {
                throw new IOException(e.getMessage());
            }
        } else if (location.getProtocol().equals("jar")) {
            JarURLConnection juc = (JarURLConnection) location.openConnection();
            findPackages(juc, basePackage, baseClass, classes);
        }


        Collections.sort(classes, new Comparator<Class<? extends T>>() {

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                        ignoredPackages);
            } catch (URISyntaxException e) {
                throw new IOException(e.getMessage());
            }
        } else if (location.getProtocol().equals("jar")) {
            JarURLConnection juc = (JarURLConnection) location.openConnection();
            findClassesInJar(juc, basePackage, baseClass, classes);
        }


        Collections.sort(classes, new Comparator<Class<? extends T>>() {

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