25 December 2011

Zipping in Java

import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class Zipper
{

    public static byte[] zip(String[] names, byte[][] data) throws IOException
    {
        if (names == null || data == null || names.length == 0 || names.length < data.length)
     throw new IllegalArgumentException("Arguemnts are null or empty or names less than data");

        ByteArrayOutputStream outZipStream = new ByteArrayOutputStream();
        ZipOutputStream out = new ZipOutputStream(outZipStream);

        int l = data.length;
        for (int i=0; i < l; i++)
        {
            out.putNextEntry(new ZipEntry(names[i]));
            out.write(data[i]);
            out.closeEntry();
        }

        out.close();

        return outZipStream.toByteArray();
    }


    public static void main(String[] args) throws IOException
    {
        byte[] file1Data = "File 1 content".getBytes("UTF-8");
        byte[] file2Data = "File 2 content".getBytes("UTF-8");

        byte[] zippedData = zip (new String[] {"file1.txt", "file2.txt"}, new byte[][] {file1Data, file2Data});

        FileOutputStream fileOutputStream = new FileOutputStream("test.zip");
        fileOutputStream.write(zippedData);
        fileOutputStream.close();
    }
}
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