Java FileStore
class allows you to access information about a systems files store such as available space, total space and used space.
Setup
private static final String SOURCE = "com/levelup/java/io/get-used-space.txt";
Path source;
@Before
public void setUp () throws IOException, URISyntaxException {
source = Paths.get(this.getClass().getClassLoader().getResource(SOURCE).toURI());
}
Straight up Java
File.getTotalSpace - File.getFreeSpace()
@Test
public void get_used_space () {
File file = source.toFile();
long usedSpace = (file.getTotalSpace() - file.getFreeSpace()) / 1024;
assertTrue(usedSpace > 0);
}
Java 7 File I/O
@Test
public void get_used_space_nio () throws IOException {
FileStore store = Files.getFileStore(source);
long usedSpace = (store.getTotalSpace() -
store.getUnallocatedSpace()) / 1024;
assertTrue(usedSpace > 0);
}