title: Groovy and POI: Can I read/write at the same time?
body: <p>I'm new to groovy, and I've used the ExcelBuilder code referenced below to iterate through an excel spreadsheet to grab data.  Is there an easy to write data as I iterate?</p>
  
  <p>For example, row 1 might have data like this (CSV):</p>
  
  <pre><code>value1,value2
  </code></pre>
  
  <p>And after I iterate, I want it to look like this:</p>
  
  <pre><code>value1,value2,value3
  </code></pre>
  
  <p><a href="http://www.technipelago.se/content/technipelago/blog/44" rel="nofollow">http://www.technipelago.se/content/technipelago/blog/44</a></p>