Method urlExists

output/java8/1.4.17/Misc.java:170–197

(URL url)

    }

    public static boolean urlExists(URL url) {
        try {
            URLConnection connection = url.openConnection();
            if ( connection instanceof JarURLConnection ) {
                JarURLConnection jarURLConnection = (JarURLConnection)connection;
                URLClassLoader urlClassLoader = new URLClassLoader(new URL[] {
                                                                             jarURLConnection.getJarFileURL()
});
                try { return urlClassLoader.findResource(jarURLConnection.getEntryName())!=null; }
                finally {
                    if ( urlClassLoader instanceof Closeable ) {
                        ((Closeable)urlClassLoader).close();
                    }
                }
            }
            InputStream is = null;
            try {
                is = url.openStream();
            }
            finally {
                if ( is!=null ) {
                    is.close();
                }
            }
            return is!=null;
        }
        catch (IOException ioe) { return false; }
    }

    /**
     * Given {@code index} into string {@code s}, compute the line and char