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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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