title: Multi threading in Spring Batch FlatFileItemReader and FlatFileItemWriter
body: <p>My requirement is to read and write a text file with more than 50k lines so I want to implement it in spring batch, </p>
  
  <ol>
  <li><p>I want it to multi threaded and each thread should handle 1k lines and write it to output file using <code>FlatFileItemWriter</code> </p></li>
  <li><p>and also I want to read input and output file names from job parameters to configuration</p></li>
  </ol>
  
  <p>So please help me on this </p>