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

                // and files in jar


                URLConnection openConnection = location.openConnection();


                if (openConnection instanceof JarURLConnection) {
                    JarURLConnection conn = (JarURLConnection) openConnection;


                    JarFile jarFile = conn.getJarFile();


                    Enumeration<JarEntry> e = jarFile.entries();
                    while (e.hasMoreElements()) {
                        JarEntry entry = e.nextElement();
                        String entryname = entry.getName();

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            String pkgPath = pckgname.replace('.', '/');
            Enumeration<URL> resources = cld.getResources(pkgPath);
            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(pkgPath)
                                && e.getName().endsWith(".class")) {
                            String className = e.getName().replace("/", ".")

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            logger.log("  Have created expansion directory " +
                docBase.getAbsolutePath());
        }


        // Expand the WAR into the new document base directory
        JarURLConnection juc = (JarURLConnection) war.openConnection();
        juc.setUseCaches(false);
        JarFile jarFile = null;
        InputStream input = null;
        try {
            jarFile = juc.getJarFile();
            if (debug >= 2) {
                logger.log("  Have opened JAR file successfully");
            }
            Enumeration jarEntries = jarFile.entries();
            if (debug >= 2) {

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        try {
            URL url = ctxt.getResource(resourcePath);
            if (url == null) return;
            url = new URL("jar:" + url.toString() + "!/");
            JarURLConnection conn =
                (JarURLConnection) url.openConnection();
            jarFile = conn.getJarFile();
            Enumeration entries = jarFile.entries();
            while (entries.hasMoreElements()) {
                JarEntry entry = (JarEntry) entries.nextElement();
                String name = entry.getName();
                if (!name.startsWith("META-INF/")) continue;

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            JarFile jarFile = null;
            try {
                Manifest manifest = null;
                if (repository.startsWith("jar:")) {
                    URL url = new URL(null, repository, streamHandler);
                    JarURLConnection conn =
                        (JarURLConnection) url.openConnection();
                    conn.setAllowUserInteraction(false);
                    conn.setDoInput(true);
                    conn.setDoOutput(false);
                    conn.connect();
                    jarFile = conn.getJarFile();
                } else if (repository.startsWith("file://")) {
                    jarFile = new JarFile(repository.substring(7));
                } else if (repository.startsWith("file:")) {
                    jarFile = new JarFile(repository.substring(5));
                } else if (repository.endsWith(".jar")) {
                    URL url = new URL(null, repository, streamHandler);
                    URLConnection conn = url.openConnection();
                    JarInputStream jis =
                        new JarInputStream(conn.getInputStream());
                    manifest = jis.getManifest();
                } else {
                    throw new IllegalArgumentException
                        ("addRepositoryInternal:  Invalid URL '" +
                         repository + "'");

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        File resources = Support_Resources.createTempFolder();
        Support_Resources.copyFile(resources, null, "hyts_att.jar");
        URL fUrl1 = new URL("jar:file:" + resources.getPath()
                + "/hyts_att.jar!/");
        JarURLConnection con1 = (JarURLConnection) fUrl1.openConnection();
        map = con1.getRequestProperties();
        assertNotNull(map);
        assertEquals(0, map.size());
        try {
            // the map should be unmodifiable
            map.put("hi", Arrays.asList(new String[] { "bye" }));

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        assertTrue(headers.size() > 1);
        File resources = Support_Resources.createTempFolder();
        Support_Resources.copyFile(resources, null, "hyts_att.jar");
        URL fUrl1 = new URL("jar:file:" + resources.getPath()
                + "/hyts_att.jar!/");
        JarURLConnection con1 = (JarURLConnection) fUrl1.openConnection();
        headers = con1.getHeaderFields();
        assertNotNull(headers);
        assertEquals(0, headers.size());
        try {
            // the map should be unmodifiable
            headers.put("hi", Arrays.asList(new String[] { "bye" }));

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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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            JarFile jarFile = null;
            try {
                Manifest manifest = null;
                if (repository.startsWith("jar:")) {
                    URL url = new URL(null, repository, streamHandler);
                    JarURLConnection conn =
                        (JarURLConnection) url.openConnection();
                    conn.setAllowUserInteraction(false);
                    conn.setDoInput(true);
                    conn.setDoOutput(false);
                    conn.connect();
                    jarFile = conn.getJarFile();
                } else if (repository.startsWith("file://")) {
                    jarFile = new JarFile(repository.substring(7));
                } else if (repository.startsWith("file:")) {
                    jarFile = new JarFile(repository.substring(5));
                } else if (repository.endsWith(".jar")) {
                    URL url = new URL(null, repository, streamHandler);
                    URLConnection conn = url.openConnection();
                    JarInputStream jis =
                        new JarInputStream(conn.getInputStream());
                    manifest = jis.getManifest();
                } else {
                    throw new IllegalArgumentException
                        ("addRepositoryInternal:  Invalid URL '" +
                         repository + "'");

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    public void test_getJarFile() throws MalformedURLException, IOException {
        URL url = null;
        url = new URL("jar:"
                + BASE.toString()+"/lf.jar!/missing");


        JarURLConnection connection = null;
        connection = (JarURLConnection) url.openConnection();
        try {
            connection.connect();
            fail("Did not throw exception on connect");
        } catch (IOException e) {
            // expected
        }


        try {
            connection.getJarFile();
            fail("Did not throw exception after connect");
        } catch (IOException e) {
            // expected
        }


        File resources = Support_Resources.createTempFolder();


        Support_Resources.copyFile(resources, null, "hyts_att.jar");
        File file = new File(resources.toString() + "/hyts_att.jar");
        URL fUrl1 = new URL("jar:file:" + file.getPath() + "!/");
        JarURLConnection con1 = (JarURLConnection) fUrl1.openConnection();
        ZipFile jf1 = con1.getJarFile();
        JarURLConnection con2 = (JarURLConnection) fUrl1.openConnection();
        ZipFile jf2 = con2.getJarFile();
        assertTrue("file: JarFiles not the same", jf1 == jf2);
        jf1.close();
        assertTrue("File should exist", file.exists());
        new URL("jar:" + BASE.toString()+"/lf.jar!/");
        con1 = (JarURLConnection) fUrl1.openConnection();
        jf1 = con1.getJarFile();
        con2 = (JarURLConnection) fUrl1.openConnection();
        jf2 = con2.getJarFile();
        assertTrue("http: JarFiles not the same", jf1 == jf2);
        jf1.close();
    }

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