OSB processing of gz gzip files

Taking example from this post, I have developed this Java Callout class:

package com.acme.osb.utilities;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.zip.GZIPInputStream;

public class UnzipAndWriteToFile {
 public static String inputFileName = "c:\\pierre\\myfile.txt.gz";
 public static String outputFileName = "c:\\pierre\\myfile.txt";

 public static void main(String[] args) throws Exception {
  unzipGZIPFile(inputFileName, outputFileName);
 }

 /*
  * Read from a gz byte[] and writes to a file
  */
 public static String processBytes(byte[] data, String outputFile) throws Exception {
  ByteArrayInputStream bais = new ByteArrayInputStream(data);
  fromGZStreamToFile(outputFile, bais);
  return "OK";
 }

 /**
  * Read from a gz file and writes the unzipped content to another file
  * 
  * @param fileName
  * @param outputFile
  * @throws Exception
  */
 public static void unzipGZIPFile(String fileName, String outputFile) throws Exception {
  FileInputStream in = new FileInputStream(fileName);
  fromGZStreamToFile(outputFile, in);
 }

 /**
  * Persist a gz stream to a file
  * @param outputFile
  * @param in
  * @throws IOException
  * @throws FileNotFoundException
  */
 private static void fromGZStreamToFile(String outputFile, InputStream in) throws IOException, FileNotFoundException {
  GZIPInputStream gzip = new GZIPInputStream(in);
  BufferedReader br = new BufferedReader(new InputStreamReader(gzip));
  PrintWriter pw = new PrintWriter(outputFile);
  String line;
  while ((line = br.readLine()) != null) {
   pw.println(line);
  }
  br.close();
  pw.close();
 }
}

Our aim is to read a gz file from HTTP server and write it locally, before we further process it.
We do a Service Callout to a Business Service (response type is binary), and it returns us this response: <con:binary-content ref="cid:-34da800e:1442fd94091:-7fae" xmlns:con="http://www.bea.com/wli/sb/context"/> .
We can pass this variable as such to the "public static String processBytes(byte[] data, String outputFile)" function, as this variable represents a reference to an array of bytes which is the binary content of the gz file. processBYtes will persist the unzipped content to a give file (specify full path)