title: How to convert FileInputStream to InputStream?
body: <p>I just want to convert a <code>FileInputStream</code> to an <code>InputStream</code>, how can I do that?</p>
  
  <p>e.g </p>
  
  <pre><code>FileInputStream fis = new FileInputStream("c://filename");
  InputStream is = ?; 
  fis.close();
  </code></pre>