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check free diskspace

Is there a way to check the free diskspace using JDK 1.4?Tanx for your help !

[91 byte] By [thtthta] at [2007-9-27 12:08:27]

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# 1

I think this is scheduled for release in 2056 http://developer.java.sun.com/developer/bugParade/bugs/4057701.html

luke_hillarya at 2007-7-9 7:05:28 >

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# 2

You do it by invoking a system process that reads in the contents of a directory and then parse out the file size. But that is somewhat operating system specific as to how you get the directory structure with the file size. But is possible that way.Bryan

csbnoa at 2007-7-9 7:05:28 >

# 3

You can do that by using the java.io classes. One way is to get the file lengths for all the files and deduct it from the total disk space. You have convienient methods readymade for doing that. Check it out.

har_vara at 2007-7-9 7:05:28 >

# 4

If it's that simple - how do you get the total disk space? And who wants to iterate over all 32,000 files on a filesystem to obtain an inaccurate assessment of used space? Not to mention that any space used by metadata won't generally be reported by File.length() so disk free space won't be accurate, anyway.

I would look at JConfig.

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

smithsa at 2007-7-9 7:05:28 >

# 5

I used native methods, written in C/C++ (jpath is the path of a directory where you need the disk space, such as "c:\"):

// Returns amount of free disk space

// Returns -1 on error

JNIEXPORT jlong JNICALL Java_com_diskFree

(JNIEnv *env, jclass cls, jstring jPath)

{

long freeMb = -1;

char*path;

#ifdef _WINDOWS

ULARGE_INTEGER freeAvail;

ULARGE_INTEGER totalBytes;

ULARGE_INTEGER freeBytes;

#else

struct statvfs buf;

#endif

path = (char *)((*env)->GetStringUTFChars(env, jPath, NULL));

#ifdef _WINDOWS

if (GetDiskFreeSpaceEx(path,

&freeAvail, &totalBytes, &freeBytes) > 0)

{

if ((freeAvail.QuadPart/1000000) >= LONG_MAX)

freeMb = LONG_MAX;

else if ((freeAvail.QuadPart/1000000) > 1)

freeMb = (freeAvail.QuadPart/(1024 * 1024));

if (freeMb < 0)

{

if ((freeBytes.QuadPart/1000000) >= LONG_MAX)

freeMb = LONG_MAX;

else if ((freeBytes.QuadPart/1000000) > 1)

freeMb = (freeBytes.QuadPart/(1024 * 1024));

}

#else

if (statvfs(path, &buf) == 0)

freeMb = buf.f_bavail * buf.f_frsize / (1024 * 1024);

#endif

(*env)->ReleaseStringUTFChars(env, jPath, path);

return freeMb;

}

sjaguirrea at 2007-7-9 7:05:28 >

# 6

I work on a Windows Platform and did a method like this:

public static String getFreeDiskSpace() throws IOException {

Runtime rt = Runtime.getRuntime();

Process p = rt.exec("a.bat");

BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));

String value = "";

String s = null;

while ((s = br.readLine()) != null)

value = s;

return value.trim();

}

The "a.bat" file looks like this:

dir

That means that the method runs the "dir"-command, retrieves the output from the dir and returns the last row which includes the number of free bytes. Of course, this line can be parsed if necessary.

Sample return from dir:

C:\OMlink3.x\nordiska\OMLINK3.1\src>dir

Volume in drive C has no label.

Volume Serial Number is CCCE-4A7B

Directory of C:\src

02-10-30 16:26 <DIR> .

02-10-30 16:26 <DIR> ..

02-10-30 16:13 3 a.bat

02-10-22 15:473 545 compile.bat

02-10-30 16:262 149 DiskTest.class

02-10-30 16:261 342 DiskTest.java

02-08-19 09:20 <DIR> om

02-10-22 15:551 136 settings.bat

02-10-22 15:47 64 vssver.scc

02-10-30 16:26 0 x.txt

10 File(s) 8 239 bytes

244 345 856 bytes free

In this case, my method returns "244 345 856 bytes free".

Hope this helps someone.

/Hampus

Hampusa at 2007-7-9 7:05:28 >

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