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System Space
This following example shows how to access disk space information from File API.
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package com.bethecoder.tutorials.system;
import java.io.File;
import java.text.DecimalFormat;
import java.text.NumberFormat;
public class SystemSpace {
public static void main(String[] args) {
File [] sysRoots = File.listRoots();
for (int i = 0; i < sysRoots.length; i++) {
System.out.println(sysRoots[i] + " drive free space : " +
bytes2String(sysRoots[i].getFreeSpace()));
System.out.println(sysRoots[i] + " drive usable space : " +
bytes2String(sysRoots[i].getUsableSpace()));
System.out.println(sysRoots[i] + " drive total space : " +
bytes2String(sysRoots[i].getTotalSpace()));
System.out.println();
}
}
public static final long SPACE_KB = 1024;
public static final long SPACE_MB = 1024 * SPACE_KB;
public static final long SPACE_GB = 1024 * SPACE_MB;
public static String bytes2String(double dataSize) {
NumberFormat nf = new DecimalFormat();
nf.setMaximumFractionDigits(2);
try {
if ( dataSize < SPACE_KB ) {
return nf.format(dataSize) + " Bytes";
} else if ( dataSize < SPACE_MB ) {
return nf.format(dataSize/SPACE_KB) + " KB";
} else if ( dataSize < SPACE_GB ) {
return nf.format(dataSize/SPACE_MB) + " MB";
} else {
return nf.format(dataSize/SPACE_GB) + " GB";
}
} catch (Exception e) {
return dataSize + " Bytes";
}
}/* end of bytes2String method */
}
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It gives the following output,
A:\ drive free space : 0 Bytes
A:\ drive usable space : 0 Bytes
A:\ drive total space : 0 Bytes
C:\ drive free space : 1.06 GB
C:\ drive usable space : 1.06 GB
C:\ drive total space : 9.32 GB
D:\ drive free space : 764.45 MB
D:\ drive usable space : 764.45 MB
D:\ drive total space : 18.62 GB
E:\ drive free space : 938.19 MB
E:\ drive usable space : 938.19 MB
E:\ drive total space : 18.62 GB
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