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


        InputStream            istream;
        InputSource            isource;
        DocumentBuilderFactory builderFactory;
        DocumentBuilder        builder;
        JarURLConnection       jarConnection;
        JarEntry               jarentry;
        JarFile                jarfile;
        URL                    url;


        converterInfoList = new Vector();
        jarfilename       = jar;


        // Get Jar via URL
        //
        url               = new URL("jar:" + jar + "!/META-INF/converter.xml");
        jarConnection     = (JarURLConnection)url.openConnection();
        jarentry          = jarConnection.getJarEntry();
        jarfile           = jarConnection.getJarFile();


        // Build the InputSource
        //
        istream           = jarfile.getInputStream(jarentry);
        isource           = new InputSource(istream);

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            // per-entry attribute is most probably the last resource in the
            // list, therefore search backwards
            for ( int i = res.size() - 1; i >= 0; i-- ) {
                URL jarurl = (URL) res.elementAt( i );
                try {
                    JarURLConnection jarConnection =
                        (JarURLConnection) jarurl.openConnection();
                    Manifest mf = jarConnection.getManifest();
                    Attributes attrs = (Attributes) mf.getAttributes(
                        "com/sun/star/lib/loader/Loader.class" );
                    if ( attrs != null ) {
                        className = attrs.getValue( "Application-Class" );
                        if ( className != null )

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     * Add a resources JAR. The contents of /META-INF/resources/ will be used if
     * a requested resource can not be found in the main context.
     */
    public void addResourcesJar(URL url) {
        try {
            JarURLConnection conn = (JarURLConnection) url.openConnection();
            JarFile jarFile = conn.getJarFile();   
            ZipEntry entry = jarFile.getEntry("/");
            WARDirContext warDirContext = new WARDirContext(jarFile,
                    new WARDirContext.Entry("/", entry));
            warDirContext.loadEntries();
            altDirContexts.add(warDirContext);

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      {
        urlConnection = url.openConnection();
        long lastModified = this.lastModified;
        if (urlConnection instanceof JarURLConnection)
        {
          JarURLConnection jarUrlConnection = (JarURLConnection)urlConnection;
          URL jarFileUrl = jarUrlConnection.getJarFileURL();
          URLConnection jarFileConnection = jarFileUrl.openConnection();
          try
          {
            lastModified = jarFileConnection.getLastModified();
          }

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        // Expand the WAR into the new document base directory
        String canonicalDocBasePrefix = docBase.getCanonicalPath();
        if (!canonicalDocBasePrefix.endsWith(File.separator)) {
            canonicalDocBasePrefix += File.separator;
        }
        JarURLConnection juc = (JarURLConnection) war.openConnection();
        juc.setUseCaches(false);
        JarFile jarFile = null;
        InputStream input = null;
        boolean success = false;
        try {
            jarFile = juc.getJarFile();
            Enumeration<JarEntry> jarEntries = jarFile.entries();
            while (jarEntries.hasMoreElements()) {
                JarEntry jarEntry = jarEntries.nextElement();
                String name = jarEntry.getName();
                File expandedFile = new File(docBase, name);

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        // Calculate the document base directory
        String canonicalDocBasePrefix = docBase.getCanonicalPath();
        if (!canonicalDocBasePrefix.endsWith(File.separator)) {
            canonicalDocBasePrefix += File.separator;
        }
        JarURLConnection juc = (JarURLConnection) war.openConnection();
        juc.setUseCaches(false);
        JarFile jarFile = null;
        try {
            jarFile = juc.getJarFile();
            Enumeration<JarEntry> jarEntries = jarFile.entries();
            while (jarEntries.hasMoreElements()) {
                JarEntry jarEntry = jarEntries.nextElement();
                String name = jarEntry.getName();
                File expandedFile = new File(docBase, name);

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     */
    private synchronized void close() {
        if (conn != null) {
            try {
                if (conn instanceof JarURLConnection) {
                    JarURLConnection juc = (JarURLConnection) conn;
                    JarFile jf = juc.getJarFile();
                    jf.close();
                    jf = null;
                } else if (conn instanceof HttpURLConnection) {
                    ((HttpURLConnection) conn).disconnect();
                }

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            }
        }
    }


    private NonClosingJarInputStream createJarInputStream() throws IOException {
        JarURLConnection jarConn = (JarURLConnection) url.openConnection();
        URL resourceURL = jarConn.getJarFileURL();
        URLConnection resourceConn = resourceURL.openConnection();
        resourceConn.setUseCaches(false);
        return new NonClosingJarInputStream(resourceConn.getInputStream());
    }

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    private JarFile jarFile;
    private Enumeration<JarEntry> entries;
    private JarEntry entry = null;


    public FileUrlJar(URL url) throws IOException {
        JarURLConnection jarConn = (JarURLConnection) url.openConnection();
        jarFile = jarConn.getJarFile();
    }

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        }


        else if (systemId.startsWith("jar:"))
        {
            URL url = new URL(systemId);
            JarURLConnection conn = (JarURLConnection) url.openConnection();
            JarEntry jarEntry = conn.getJarEntry();
            if (jarEntry == null)
            {
                log.fatal("JAR entry '" + systemId + "' not found.");
            }
            //_jarFile.getInputStream(jarEntry);
            stream = conn.getJarFile().getInputStream(jarEntry);
        }
        else
        {
            if (_externalContext == null)
            {

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