ZipDemo.java Source code

Introduction

Here is the source code for ZipDemo.java

Source

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import java.util.zip.ZipException;

class ZipDemo {
    private static final int DEFAULT_BUFFER_SIZE = 4096;

    public static final byte[] compress(final String uncompressed) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        GZIPOutputStream zos = new GZIPOutputStream(baos);

        byte[] uncompressedBytes = uncompressed.getBytes();

        zos.write(uncompressedBytes, 0, uncompressedBytes.length);
        zos.close();

        return baos.toByteArray();
    }

    public static final String uncompress(final byte[] compressed) throws IOException {
        String uncompressed = "";

        try {
            ByteArrayInputStream bais = new ByteArrayInputStream(compressed);
            GZIPInputStream zis = new GZIPInputStream(bais);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            int numBytesRead = 0;
            byte[] tempBytes = new byte[DEFAULT_BUFFER_SIZE];
            while ((numBytesRead = zis.read(tempBytes, 0, tempBytes.length)) != -1) {
                baos.write(tempBytes, 0, numBytesRead);
            }

            uncompressed = new String(baos.toByteArray());
        } catch (ZipException e) {
            e.printStackTrace(System.err);
        }

        return uncompressed;
    }

    public static final String uncompress(final String compressed) throws IOException {
        return ZipDemo.uncompress(compressed.getBytes());
    }

    public static void main(String[] args) throws Exception {
        for (int i = 0; i < args.length; ++i) {
            String uncompressed = "";
            File f = new File(args[i]);

            if (f.exists()) {
                BufferedReader br = new BufferedReader(new FileReader(f));

                String line = "";
                StringBuffer buffer = new StringBuffer();

                while ((line = br.readLine()) != null)
                    buffer.append(line);

                br.close();
                uncompressed = buffer.toString();
            } else {
                uncompressed = args[i];
            }

            byte[] compressed = ZipDemo.compress(uncompressed);

            String compressedAsString = new String(compressed);

            byte[] bytesFromCompressedAsString = compressedAsString.getBytes();

            bytesFromCompressedAsString.equals(compressed);
            System.out.println(ZipDemo.uncompress(compressed));
            System.out.println(ZipDemo.uncompress(compressedAsString));
        }
    }
}