Java I/O How to - Read from a zip file with ByteBuffer

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Question

We would like to know how to read from a zip file with ByteBuffer.

Answer

import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.zip.GZIPInputStream;
// w  ww  .  j a  v  a  2s  .  co m
public class MainClass {

  public static void main(String[] args) throws IOException {

    FileInputStream fin = new FileInputStream(args[0]);
    GZIPInputStream gzin = new GZIPInputStream(fin);
    ReadableByteChannel in = Channels.newChannel(gzin);

    WritableByteChannel out = Channels.newChannel(System.out);
    ByteBuffer buffer = ByteBuffer.allocate(65536);
    while (in.read(buffer) != -1) {
      buffer.flip();
      out.write(buffer);
      buffer.clear();
    }
  }
}

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