所属类别：JavaScripts

文章作者：佚名

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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FileRegistry.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。关闭本页

....