How to compress and decompress files in GZIP format ?

Compress a file in GZIP format

Gzip is not a ZIP tool, it only use to compress a file into a “.gz” format, not compress several files into a single archive.

String OUTPUT_GZIP_FILE = "/home/shaan/file1.gz";

String SOURCE_FILE = "/home/shaan/file1.txt";

byte[] buffer = new byte[1024];

GZIPOutputStream gzos =

       new GZIPOutputStream(new FileOutputStream(OUTPUT_GZIP_FILE));

FileInputStream in = new FileInputStream(SOURCE_FILE);

int len;

while ((len = in.read(buffer)) > 0) {

  gzos.write(buffer, 0, len);

}

in.close();

gzos.finish();

gzos.close();

Decompress file from GZIP file

String INPUT_GZIP_FILE = "/home/shaan/file1.gz";

String OUTPUT_FILE = "/home/shaan/file1.txt";

byte[] buffer = new byte[1024];

GZIPInputStream gzis =

        new GZIPInputStream(new FileInputStream(INPUT_GZIP_FILE));

FileOutputStream out = new FileOutputStream(OUTPUT_FILE);

int len;

while ((len = gzis.read(buffer)) > 0) {

  out.write(buffer, 0, len);

}

gzis.close();

out.close();