Extract .gz files in java
<p>I'm trying to unzip some .gz files in java. After some researches i wrote this method:</p>

<pre><code>    public static void gunzipIt(String name){

    byte[] buffer = new byte[1024];

    try{

        GZIPInputStream gzis = new GZIPInputStream(new FileInputStream("/var/www/html/grepobot/API/"+ name + ".txt.gz"));
        FileOutputStream out = new FileOutputStream("/var/www/html/grepobot/API/"+ name + ".txt");

        int len;
        while ((len = gzis.read(buffer)) &gt; 0) {
            out.write(buffer, 0, len);
        }

        gzis.close();
        out.close();

        System.out.println("Extracted " + name);

    } catch(IOException ex){
        ex.printStackTrace();
    }
}
</code></pre>

<p>when i try to execute it i get this error:
java.util.zip.ZipException: Not in GZIP format</p>

<p>how can i solve it? Thanks in advance for your help</p>