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 (bi.hasNext()) {
      String location = bi.next().getLocation();
      if (location.startsWith("jar")) {
        try {
          URL url = new URL(location);
          JarURLConnection urlc = (JarURLConnection) url.openConnection();
          
          // Make sure that we pick up the cached version rather than creating a new one
          urlc.setUseCaches(true);
          urlc.getJarFile().close();
        } catch (IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
      }

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     * @param url The URL of the JAR file
     * @throw IOException Upon failure to open the JAR file URL
     */
    public ArchiveManifest(URL url) throws IOException {
        /* Open a connection to the JAR file and parse out its entries */
        JarURLConnection urlconn = (JarURLConnection) url.openConnection();
        this.url = url;
        this.jarfile = urlconn.getJarFile();
        this.createArchiveMap(this.jarfile);
    }

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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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        // 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 jarEntries = jarFile.entries();
            while (jarEntries.hasMoreElements()) {
                JarEntry 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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                }
            } 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(mark, "jsp.error.tld.unable_to_read", location[0],

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            } catch (IOException e) {
                return COLLECTION;
            }
        } else {
            URL jarURL = new URL("jar:" + url.toString() + "!/");
            JarURLConnection jarConnection = (JarURLConnection) jarURL.openConnection();
            try {
                jarConnection.getManifest();
                return PACKED_ARCHIVE;
            } catch (ZipException e) {
                return RESOURCE;
            }
        }

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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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