package co.wlv.apputil;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.filefilter.TrueFileFilter;

public class CalculateFileSizeInDir {

    public static void main(String args[]) throws Exception {

        String zipFileName = "C:\\path\\to\\my.zip";
        File initialFile = new File(zipFileName);
        InputStream targetStream = new FileInputStream(initialFile);
        File extractDir = new File("output");
        FileUtils.deleteDirectory(extractDir);
        unZipImportData(targetStream, extractDir);

        List files = (List) FileUtils.listFiles(extractDir, TrueFileFilter.INSTANCE, TrueFileFilter.INSTANCE);
        for (File file : files) {
            System.out.println("file: " + file.getCanonicalPath() + " - file Size: " + readableFileSize(file.length()));
        }
    }

    public static String readableFileSize(long size) {
        if (size <= 0)
            return "0";
        final String[] units = new String[] { "B", "kB", "MB", "GB", "TB" };
        int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
        return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + " " + units[digitGroups];
    }

    public static double fileSize(long size) {
        if (size <= 0)
            return 0;
        int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
        return size / Math.pow(1024, digitGroups);
    }

    public static String getUnits(long size) {
        if (size <= 0)
            return "0";
        final String[] units = new String[] { "B", "kB", "MB", "GB", "TB" };
        int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
        return units[digitGroups];
    }

    public static void unZipImportData(InputStream zip, File extractTo) throws Exception {
        ZipInputStream zipInputStream = new ZipInputStream(zip);
        ZipEntry zipEntry;
        try {
            while ((zipEntry = zipInputStream.getNextEntry()) != null) {
                File file = new File(extractTo, zipEntry.getName());
                if (zipEntry.isDirectory() && !file.exists())
                    file.mkdirs();
                else {
                    if (!file.getParentFile().exists())
                        file.getParentFile().mkdirs();

                    BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(file));
                    byte[] buffer = new byte[8192];
                    int read;

                    while (-1 != (read = zipInputStream.read(buffer)))
                        out.write(buffer, 0, read);

                    zipInputStream.closeEntry();
                    out.close();
                }
            }
            zipInputStream.close();
            zipInputStream = null;
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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Posted by Wyatt on October 29, 2015 8:44:00 AM EDT #