InputStreamReader reader = new InputStreamReader(zip, MY_TEXT_FILES_ENCODING);
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, MY_TEXT_FILES_ENCODING));

IOUtils.copy( new ZipInputStream(blob.getBinaryStream()), new FileOutputStream(new File("C:\\" + e.getName())));

BufferedReader r = new BufferedReader(reader, 1024*1024);
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os), 1024*1024);

public static long copyLarge(InputStream input, OutputStream output) throws IOException {

        byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
        long count = 0;
        int n = 0;

        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, n);
            count += n;
        }
        return count;
}

while ((cnt = r.read(bytes))!= -1)
writer.write(cnt);

сopy( new ZipInputStream(blob.getBinaryStream()), new FileOutputStream(new File("C:\\" + e.getName())));

public static long copy(InputStream input, OutputStream output) throws IOException {

        byte[] buffer = new byte[MY_BUFFER_SIZE];
        long count = 0;
        int n = 0;

        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, n);
            count += n;
        }
        return count;
}

BufferedReader r = new BufferedReader(reader);
while ((c = reader.read())!= -1){
  if(c == '\n'){
      doSomething();
  }
}

while ((c = r.read(buf))!= -1){
  for(int i = 0; i < c && i < buf.length; i ++){
      if(buf[i] == '\n'){
         doSomething();
      }
  }  
}