title: Add Line before Header in csv using Spring batch
body: <p>I have to add one Disclaimer Line in a CSV file before the headers using Spring Batch implementation.
  For example, below is my expected CSV File:</p>
  <p><strong>Disclaimer-XYZ...</strong>
  <strong>Col1 Col2 Col3</strong>
  <strong>abc  efg  pqr</strong></p>
  <p>Currently, I am using FlatFileItemWriter and FlatFileHeaderCallBack to create the CSV File along with writing headers and their corresponding values in it.</p>
  <p>But I am not able to add a disclaimer and then follow by the Headers as shown above.</p>
  <p>Here is a glimpse of my code:</p>
  <pre><code>stepWriter.setHeaderCallback(new FlatFileHeaderCallback()
      public void writeHeader(Writer writer) throws IOException{`
      writer.write(disclaimer);
      writer.write(“Col1”, “Col2”,”Col3”);
      }
  });
  </code></pre>
  <p>But with the above code the actual CSV looks like this:</p>
  <p><strong>Disclaimer-XYZ Col1 Col2 Col3</strong></p>