Decompress Zip file to a directory, optionally deleting the zip file. - Java File Path IO

Java examples for File Path IO:Zip File

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Description

Decompress Zip file to a directory, optionally deleting the zip file.

Demo Code


import java.io.*;
import java.util.zip.*;
import java.lang.RuntimeException;

public class Main{
    private static int BUFFER_SIZE = 2048;
    /**//from ww w . j a  v  a 2  s.  c  o m
     * Decompress Zip file to a directory, optionally deleting the zip file.
     *
     * Oracle "recipe" with a touch of existing file/directory handling
     *
     * @see:
     * http://www.oracle.com/technetwork/articles/java/compress-1565076.html
     * http://android-er.blogspot.com.es/2011/04/unzip-compressed-file-using-javautilzip.html
     */
    public static void decompressZip(String zipFile, String destDir,
            boolean deleteZip) throws RuntimeException {
        Logger.coloredLog("\nDecompressing " + zipFile + " to " + destDir
                + "\n", Logger.ANSI_YELLOW);

        // make sure destination directory ends with "/" for later concating
        if (!destDir.endsWith("/"))
            destDir = destDir.concat("/");

        try {
            BufferedOutputStream bos = null;
            FileInputStream fis = new FileInputStream(zipFile);
            ZipInputStream zis = new ZipInputStream(
                    new BufferedInputStream(fis));
            ZipEntry zipEntry;

            // read all entries (files/directories) from zip file
            while ((zipEntry = zis.getNextEntry()) != null) {
                String zipEntryName = zipEntry.getName();
                File file = new File(destDir + zipEntryName);

                // if file already exists...
                if (file.exists()) {
                    // ...do nothing
                    Logger.coloredLog("Skipping: " + zipEntry
                            + ", already exists", Logger.ANSI_CYAN);
                } else {
                    // if file is a directory...
                    if (zipEntry.isDirectory()) {
                        // ...create it
                        file.mkdirs();
                    } else {
                        // file IS a file, extract...
                        Logger.log("Extracting: " + zipEntry);

                        byte data[] = new byte[BUFFER_SIZE];
                        FileOutputStream fos = new FileOutputStream(file);
                        bos = new BufferedOutputStream(fos, BUFFER_SIZE);
                        int count;

                        while ((count = zis.read(data, 0, BUFFER_SIZE)) != -1) {
                            bos.write(data, 0, count);
                        }

                        bos.flush();
                        bos.close();
                    }
                }
            }
            zis.close();
        } catch (FileNotFoundException ffe) {
            throw new RuntimeException(ffe);
        } catch (IOException ioe) {
            throw new RuntimeException(ioe);
        }

        // optionally delete the zip archive
        if (deleteZip) {
            File zip = new File(zipFile);
            if (zip.exists()) {
                zip.delete();
            }
        }
    }
}

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