Get the amount of free or total bytes on file system using the Java 7 NIO API

file-size.java

        long freeSpace = 0;
        long totalSpace = 0;
        try {
            FileStore fileStore = Files.getFileStore(Paths.get("."));
            freeSpace = fileStore.getUsableSpace();
            totalSpace = fileStore.getUsableSpace();
        } catch (IOException ioEx) {
            Logger.getGlobal().log(Level.WARNING, "Cannot calculate free/total disk space", ioEx);
        }