Here you can find the source of decompress(String path, boolean delete)
public static void decompress(String path, boolean delete) throws Exception
import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.zip.GZIPInputStream; public class Main { public static final int BUFFER = 1024; public static final String EXT = ".gz"; public static byte[] decompress(byte[] data) { ByteArrayInputStream bais = new ByteArrayInputStream(data); ByteArrayOutputStream baos = new ByteArrayOutputStream(); //from w w w . jav a2 s. com decompress(bais, baos); data = baos.toByteArray(); try { baos.flush(); } catch (IOException e) { System.out.println(e.getMessage()); } finally { if (baos != null) { try { baos.close(); } catch (IOException e) { } } if (bais != null) { try { bais.close(); } catch (IOException e) { } } } return data; } public static void decompress(File file) throws Exception { decompress(file, true); } public static void decompress(File file, boolean delete) throws Exception { FileInputStream fis = new FileInputStream(file); FileOutputStream fos = new FileOutputStream(file.getPath().replace( EXT, "")); decompress(fis, fos); fis.close(); fos.flush(); fos.close(); if (delete) { file.delete(); } } public static void decompress(InputStream is, OutputStream os) { GZIPInputStream gis = null; try { gis = new GZIPInputStream(is); int count; byte data[] = new byte[BUFFER]; while ((count = gis.read(data, 0, BUFFER)) != -1) { os.write(data, 0, count); } } catch (IOException e) { System.out.println(e.getMessage()); } finally { if (gis != null) { try { gis.close(); } catch (IOException e) { } } } } public static void decompress(String path) throws Exception { decompress(path, true); } public static void decompress(String path, boolean delete) throws Exception { File file = new File(path); decompress(file, delete); } }