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用JAVA得到硬盘空间的三种不同方法

  一般来讲,要用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.

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