用

Java

得到硬盘空间,有3种方法:

1. 调用system的command,然后分析得到的结果,这种方法有很强的系统依赖性,

Linux

下和win下要分别写程序。下面是一个win下的例子,编译成功之后,运行java Diskspace yourdir(比如c:)

import java.io.BufferedReader;

import java.io.InputStreamReader;

/**

* 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("/.", "");

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]));

}

}

}

}

方法二:使用Jconfig,可以跨平台

从http://www.tolstoy.com/samizdat/jconfig.html上

下载

jconfig.

下载的包的sample里有很简单的例子,如果是要得到磁盘空间的话:

用FileRe

GIS

try.getVolumes()得到DiskVolume 然后call getFreeSpace()和getMaxCapacity() 就是这么简单..:) 方法三:jni 这个是解决所有和os相关的操作的万能利器了. 例子我也懒得写了. 写一个dll然后call之即可.