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

            path = path + "/";
        }


        URL sourceURL = classLoader.getResource(prefix + path);
        URLConnection conn = sourceURL.openConnection();
        JarURLConnection jarConn = (JarURLConnection) conn;
        JarFile jarFile = jarConn.getJarFile();
        JarEntry sourceEntry = jarConn.getJarEntry();
        byte[] buf = new byte[1024 * 8];
        for (Enumeration entries = jarFile.entries(); entries.hasMoreElements();) {
            JarEntry entry = (JarEntry) entries.nextElement();
            if (entry.getName().startsWith(sourceEntry.getName())) {
                String entryName = entry.getName();

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        }


        // extract the manifest
        Manifest manifest;
        try {
            JarURLConnection jarConnection = (JarURLConnection) url.openConnection();
            manifest = jarConnection.getManifest();
        } catch (IOException e) {
            System.err.println("Startup jar does not contain a manifest: " + url);
            System.exit(1);
            throw new AssertionError();
        }

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        assertNotNull(beansXmlUrl);
    }




    private static void readJarEntries(URL location, String basePath, Map<String, URL> resources) throws IOException {
        JarURLConnection conn = (JarURLConnection) location.openConnection();
        JarFile jarfile = null;
        jarfile = conn.getJarFile();


        Enumeration<JarEntry> entries = jarfile.entries();
        while (entries != null && entries.hasMoreElements()) {
            JarEntry entry = entries.nextElement();
            String name = entry.getName();

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            }
        }
    }


    private static void readJarEntries(URL location, String basePath, Map<String, URL> resources) throws IOException {
        JarURLConnection conn = (JarURLConnection) location.openConnection();
        JarFile jarfile = null;
        jarfile = conn.getJarFile();


        Enumeration<JarEntry> entries = jarfile.entries();
        while (entries != null && entries.hasMoreElements()) {
            JarEntry entry = entries.nextElement();
            String name = entry.getName();

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                    * used, getJarFile() will throw an exception if the
                    * entry doesn't exist.
                    */
                    URL jarURL = ((JarURLConnection) currentUrl.openConnection()).getJarFileURL();
                    JarFile jarFile;
                    JarURLConnection juc;
                    try {
                        juc = (JarURLConnection) new URL("jar", "", jarURL.toExternalForm() + "!/").openConnection();
                        jarFile = juc.getJarFile();
                    } catch (IOException e) {
                        // Don't look for this jar file again
                        search[i] = null;
                        throw e;
                    }


                    try {
                        juc = (JarURLConnection) new URL("jar", "", jarURL.toExternalForm() + "!/").openConnection();                        
                        jarFile = juc.getJarFile();
                        String entryName;
                        if (currentUrl.getFile().endsWith("!/")) {
                            entryName = resourceName;
                        } else {
                            String file = currentUrl.getFile();
                            int sepIdx = file.lastIndexOf("!/");
                            if (sepIdx == -1) {
                                // Invalid URL, don't look here again
                                search[i] = null;
                                continue;
                            }
                            sepIdx += 2;
                            StringBuffer sb = new StringBuffer(file.length() - sepIdx + resourceName.length());
                            sb.append(file.substring(sepIdx));
                            sb.append(resourceName);
                            entryName = sb.toString();
                        }
                        if (entryName.equals("META-INF/") && jarFile.getEntry("META-INF/MANIFEST.MF") != null) {
                            return targetURL(currentUrl, "META-INF/MANIFEST.MF");
                        }
                        if (jarFile.getEntry(entryName) != null) {
                            return targetURL(currentUrl, resourceName);
                        }
                    } finally {
                        if (!juc.getUseCaches()) {
                            try {
                                jarFile.close();
                            } catch (Exception e) {
                            }
                        }

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                    classNames.addAll(jar(location));
                } else if (location.getProtocol().equals("file")) {
                    try {
                        // See if it's actually a jar
                        URL jarUrl = new URL("jar", "", location.toExternalForm() + "!/");
                        JarURLConnection juc = (JarURLConnection) jarUrl.openConnection();
                        juc.getJarFile();
                        classNames.addAll(jar(jarUrl));
                    } catch (IOException e) {
                        classNames.addAll(file(location));
                    }
                }

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        while (urls.hasMoreElements()) {
            URL url = urls.nextElement();
            //from jar files 
            if (url.toString().startsWith("jar")) {
                
                JarURLConnection jarConnection = (JarURLConnection)url.openConnection();
                
                JarFile jarFile = jarConnection.getJarFile();
                
                Enumeration<JarEntry> entry = jarFile.entries();
                
                while (entry.hasMoreElements()) {
                    JarEntry ele = (JarEntry)entry.nextElement();

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        URL url = ConfigurationUtil.class.getClassLoader().getResource("META-INF/startup-jar");


        File directory = null;
        if (url != null) {
            try {
                JarURLConnection jarConnection = (JarURLConnection) url.openConnection();
                url = jarConnection.getJarFileURL();


                URI baseURI = new URI(url.toString()).resolve("..");
                directory = new File(baseURI);
            } catch (Exception ignored) {
                log.error("Error while determining the installation directory of Apache Geronimo", ignored);

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      // Ask for all resources for the path
      Enumeration<URL> resources = cld.getResources(pckgname.replace('.', '/'));
      while (resources.hasMoreElements()) {
        URL res = resources.nextElement();
        if (res.getProtocol().equalsIgnoreCase("jar")) {
          JarURLConnection conn = (JarURLConnection) res.openConnection();
          JarFile jar = conn.getJarFile();
          for (JarEntry e : Collections.list(jar.entries())) {


            if (e.getName().startsWith(pckgname.replace('.', '/'))
                && e.getName().endsWith(".class") && !e.getName().contains("$")) {
              String className = e.getName().replace("/", ".").substring(0,

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    private JarFile getJarFile(URL jarFileUrl) throws IOException {
        JarFile jarFile = null;


        if (jarFileUrl != null) {
            JarURLConnection conn = (JarURLConnection) jarFileUrl.openConnection();
            conn.setUseCaches(false);
            conn.connect();
            jarFile = conn.getJarFile();
        }


        return jarFile;
    }

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