/** * Determine free disk space for a given Directory by * parsing the output of the dir command. * This class is inspired by the code at * Works only under Windows under certain circumstances. * Yes, it's that shaky. * Requires Java 1.4 or higher. * @[EMAIL PROTECTED] *Marco Schmidt */ public class Diskspace { private Diskspace() { // prevent instantiation of this class }
/** * Return available free disk space for a directory. * @[EMAIL PROTECTED] dirName name of the directory * @[EMAIL PROTECTED] free disk space in bytes or -1 if unknown */ public static long getFreeDiskSpace(String dirName) { try { // guess correct 'dir' command by looking at the // Operating system name String os = System.getProperty("os.name"); String command; if (os.equals("Windows NT") os.equals("windows 2000")) { command = "cmd.exe /c dir " + dirName; } else { command = "command.com /c dir " + dirName; } // run the dir command on the argument directory name Runtime runtime = Runtime.getRuntime(); Process process = null; process = runtime.exec(command); if (process == null) { return -1; } // read the output of the dir command // only the last line is of interest BufferedReader in = new BufferedReader( new InputStreamReader(process.getInputStream())); String line; String freeSpace = null; while ((line = in.readLine()) != null) { freeSpace = line; } if (freeSpace == null) { return -1; } process.destroy(); // remove dots & commas & leading and trailing whitespace freeSpace = freeSpace.trim(); freeSpace = freeSpace.replaceAll("http://.", ""); freeSpace = freeSpace.replaceAll(",", ""); String[] items = freeSpace.split(" "); // the first valid numeric value in items after(!) index 0 // is probably the free disk space int index = 1; while (index < items.length) { try { long bytes = Long.parseLong(items[index++]); return bytes; } catch (NumberFormatException nfe) { } } return -1; } catch (Exception exception) { return -1; } }
/** * Command line program to print the free diskspace to stdout * for all 26 potential root directories A:/ to Z:* (when no parameters are given to this program) * or for those directories (drives) specified as parameters. * @[EMAIL PROTECTED] args program parameters */ public static void main(String[] args) { if (args.length == 0) { for (char c = 'A'; c <= 'Z'; c++) { String dirName = c + "://"; System.out.println(dirName + " " + getFreeDiskSpace(dirName)); } } else { for (int i = 0; i < args.length; i++) { System.out.println(args[i] + " " + getFreeDiskSpace(args[i])); } } } }
