Get Directory size in java

AskBot

Can anybody help me to know the Directory size which contains
thousands of files. is there any method other than summing the size of
individual file inside the directory.

DrRakha

This class can compute the size of a directory, the key point is to use
recursion.

Code:

import java.io.File;

 
public class What033 {
public static void main(String[] args) {
What033 w = new What033();
File dir = new File("D:\\temp");
System.out.println(w.getDirSizeInMegabytes(dir));
}

long getDirSize(File dir) {
long size = 0;
if (dir.isFile()) {
size = dir.length();
} else {
File[] subFiles = dir.listFiles();

for (File file : subFiles) {
if (file.isFile()) {
size += file.length();
} else {
size += this.getDirSize(file);
}

}
}

return size;
}

long getDirSizeInMegabytes(File dir) {
return this.getDirSize(dir) / 1024 / 1024;
}
}

thushw

you can also use the apache commons io lib:

FileUtils.sizeOfDirectory

Code:

http://commons.apache.org/io/api-release/index.html

Guest

You can use use a FileFilter to visit the folder and compute the disk usage

Code:

import java.io.File;
import java.io.FileFilter;
    public class DiskUsage implements FileFilter
    {
        public DiskUsage(){};        
        private long size = 0;        
        public boolean accept(File file)
        {
            if ( file.isFile())
                size += file.length();
            else
                file.listFiles(this);
            return false;
        }
        public long getSize()
        {
            return size;
        }
    }

Code:

The complete tutorial is available at http://www.java-tutorial.ch/core-java-tutorial/calculate-file-disk-space/usage-with-java

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Get Directory size in java

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