How to know Remaining Disk Space with JDK 1.5

[James Basller]

Hi All,

I have a trouble that how can I find available disk space with JDK 1.5? I think in JDK 1.6 it's provided by IO API. But I have to use JDK1.5. is there any way to find out these things?

Thanks

[Tim McGuire]

I'm reading about jakarta commons IO FileSystemUtils class.

It has the method freeSpaceKb:


public static long freeSpaceKb(String path)
throws IOException

Returns the free space on a drive or volume in kilobytes by invoking the command line.

FileSystemUtils.freeSpaceKb("C:"); // Windows
FileSystemUtils.freeSpaceKb("/volume"); // *nix

The free space is calculated via the command line. It uses 'dir /-c' on Windows, 'df -kP' on AIX/HP-UX and 'df -k' on other Unix.

In order to work, you must be running Windows, or have a implementation of Unix df that supports GNU format when passed -k (or -kP).

(from http://commons.apache.org/io/api-release/index.html?org/apache/commons/io/FileSystemUtils.html )

ALSO:

SIGAR ( http://support.hyperic.com/display/SIGAR/Home )
System Information Gatherer And Reporter

looks full of features for querying system resources, but I've never used it.

[Tim McGuire]

I was just testing out SIGAR and found it very easy to install and use. For example, here is how you would use it to get remaining disk space:

  

import org.hyperic.sigar.FileSystemUsage;
import org.hyperic.sigar.Sigar;
import org.hyperic.sigar.SigarException;

public class MySystemInfos {
	private static Sigar sigar = new Sigar();
	public void checkSystemInfos(){
		
	}
	
	public static void main (String args[]){
		
		getInformationsAboutFileSystem();
		
	}

	private static void getInformationsAboutFileSystem() {
		String dirName = "C:\\";
		FileSystemUsage f = null;
		try{
			
			f = sigar.getFileSystemUsage(dirName);
			
		} catch (SigarException se) {
			se.printStackTrace();
		}
		
		double fAvail = f.getAvail();
		double fUsed = f.getUsed();
		double divisor = 1024 * 1000;	
		
		System.out.println("---------------------");
		System.out.printf("Sigar found %4.2f GB available \n", fAvail/divisor);
		System.out.printf("Sigar found %2.2f GB used \n", fUsed/divisor);
		System.out.println("---------------------");
		
	}
}
  

it was as easy as downloading a package and adding it to the classpath. The resources it reported are the same as what my system reported.