Java programming to get hard disk space

Because the forum was asked this question, so I wrote this article. Hope to help you.

Generally speaking, to use Java to get hard disk space, there are 3 ways:

1. Call the system command, and then analyze the results, this method has a strong system-dependent, Linux and win under the separate write program.

Here is a win under the example, after the successful compilation, run Java DiskSpace yourdir (such as C:\)

Import Java.io.BufferedReader; 
Import Java.io.InputStreamReader;
/** * Determine free disk spaces for a given directory by * parsing the output of the dir command.
* This class was inspired by the code in * 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 thi
S Class}/** * return available free disk spaces for directory A. * @[email PROTECTED] dirname name of the directory * @[email PROTECTED] free disk spaces in bytes or-1 if unknown * * Publ IC Static Long Getfreediskspace (String dirname) {try {//guess correct ' dir ' command by looking at the//op
　　　erating system name String OS = System.getproperty ("Os.name");
　　　String command; if (Os.equals ("Windows NT") | |
　　　Os.equals ("Windows Watts")) {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 "The last" is of interest bufferedreader in = new Bufferedrea
　　　Der (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 ("\.", "");
　　　FreeSpace = Freespace.replaceall (",", "");
　　　string[] items = Freespace.split ("");
　　　The 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;
　　The catch (NumberFormatException nfe) {}} return-1;
　　catch (Exception Exception) {return-1;
}/** * Command line program to print the free diskspace to stdout * for all potential root directories a:\ to Z:\
* (when no parameters are given) * 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])); } 　　} 　} }