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

            int separator = jarUri.indexOf('!');
            if (separator >= 0) {
                jarUri = jarUri.substring(0, separator);
            }


            JarURLConnection jarConn = (JarURLConnection) packageFolderURL.openConnection();
            String rootEntryName = jarConn.getEntryName();
            int rootEnd = rootEntryName.length()+1;


            List<JavaFileObject> result = null;
            Enumeration<JarEntry> entryEnum = jarConn.getJarFile().entries();
            while (entryEnum.hasMoreElements()) {
                String name = entryEnum.nextElement().getName();
                if (name.startsWith(rootEntryName) && name.indexOf('/', rootEnd) == -1 && name.endsWith(".class")) {
                    URI uri = URI.create(jarUri + "!/" + name);
                    String binaryName = name.substring(0, name.length()-6).replace('/', '.');

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                // check files in jar file, entries will list all directories
                // and files in jar


                URLConnection openConnection = location.openConnection();
                if (openConnection instanceof JarURLConnection) {
                    JarURLConnection conn = (JarURLConnection) openConnection;


                    JarFile jarFile = conn.getJarFile();


                    Manifest manifest = jarFile.getManifest();
                    if (manifest == null) {
                        // No manifest so this is not a Vaadin Add-on
                        return;

View Full Code Here

                URL url;
                try {
                    url = new URL("file:"
                            + new File(classpathEntry).getCanonicalPath());
                    url = new URL("jar:" + url.toExternalForm() + "!/");
                    JarURLConnection conn = (JarURLConnection) url
                            .openConnection();
                    debug(url.toString());


                    JarFile jarFile = conn.getJarFile();
                    Manifest manifest = jarFile.getManifest();
                    if (manifest != null) {
                        Attributes mainAttributes = manifest
                                .getMainAttributes();
                        if (mainAttributes.getValue("Vaadin-Widgetsets") != null) {

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     */
    private static void includeJar(File file, Map<String, URL> locations) {
        try {
            URL url = new URL("file:" + file.getCanonicalPath());
            url = new URL("jar:" + url.toExternalForm() + "!/");
            JarURLConnection conn = (JarURLConnection) url.openConnection();
            JarFile jarFile = conn.getJarFile();
            if (jarFile != null) {
                // the key does not matter here as long as it is unique
                locations.put(url.toString(), url);
            }
        } catch (Exception e) {

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     */
    public static Collection<String> listAllEntriesFor(URI uri) {
        final Collection<String> rval = new ArrayList<String>();


        try {
            final JarURLConnection connection = (JarURLConnection) new URI("jar:" + uri + "!/").toURL().openConnection();
            final JarFile jarFile = connection.getJarFile();


            final Enumeration<JarEntry> entries = jarFile.entries();


            while (entries.hasMoreElements()) {
                final JarEntry entry = entries.nextElement();

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        // Disabled: Not really necessary, is it? And not storing/retrieving these items
        // makes the cache file smaller and saves several ms (~200) loading and storing it
        //if (this.cacheEntry.classesValid) { return this.cacheEntry.classes; }


        try {
            final JarURLConnection connection = (JarURLConnection) new URI("jar:" + uri + "!/").toURL().openConnection();
            final JarFile jarFile = connection.getJarFile();


            final Enumeration<JarEntry> entries = jarFile.entries();


            while (entries.hasMoreElements()) {
                final JarEntry entry = entries.nextElement();

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        final String uri = this.entryMapping.get(file);


        if (uri == null) return null;


        try {
            final JarURLConnection connection = (JarURLConnection) new URI("jar:" + new File(uri).toURI() + "!/").toURL().openConnection();
            final JarFile jarFile = connection.getJarFile();


            final Enumeration<JarEntry> entries = jarFile.entries();


            while (entries.hasMoreElements()) {
                final JarEntry entry = entries.nextElement();

View Full Code Here

     */
    @Override
    public InputStream getInputStream(String file) {


        try {
            final JarURLConnection connection = (JarURLConnection) new URI("jar:" + this.location + "!/").toURL().openConnection();
            final JarFile jarFile = connection.getJarFile();


            final Enumeration<JarEntry> entries = jarFile.entries();


            while (entries.hasMoreElements()) {
                final JarEntry entry = entries.nextElement();

View Full Code Here


    // get class name from MANIFEST
    String className = null;
    try {
      URL u = new URL("jar:file:" + jarFileName + "!/");
      JarURLConnection uc = (JarURLConnection) u.openConnection();
      Attributes attr = uc.getMainAttributes();


      if (attr != null) {
        className = attr.getValue(Attributes.Name.MAIN_CLASS);
      }
    } catch (IOException ioe) {

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    // get class name from MANIFEST
    String className = null;
    try {
      URL u = new URL("jar:file:" + jarFileName + "!/");
      JarURLConnection uc = (JarURLConnection) u.openConnection();
      Attributes attr = uc.getMainAttributes();


      if (attr != null)
        className = attr.getValue(Attributes.Name.MAIN_CLASS);
    } catch (IOException ioe) {
    }

View Full Code Here

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