Get Hard disk space with Java

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

1. Call the system command, and then analyze the resulting 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 are 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 spaces for directory A.


* @[email PROTECTED]


dirname Name of the directory


* @[email PROTECTED]


free disk spaces 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" 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 ("\.", "");


freeSpace = Freespace.replaceall (",", "");


string[] items = Freespace.split ("");


//The 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;


}


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´ <=´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]);


}


}


}


}