使用java查看磁盘空间大小

类别:Java 点击:0 评论:0 推荐:

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。

本文地址:http://com.8s8s.com/it/it15535.htm