Spring-Batch Multi-line record Item Writer with variable number of lines per record

Question

I have the below requirement but am not able to decide on the approach to take:

I need to write data to a fixed format out put file where each record spans over mult

Answer 1

there is a multiline records writer example in the official spring-batch-samples, search for multiline.xml and MultiLineTradeItemWriter

its basically the usual delegate principle, you just need a proper domain object with supposable a list of those 1..n intermediate lines

    public class MultiLineTradeItemWriter implements ItemWriter, ItemStream {

    private FlatFileItemWriter delegate;

    public void write(List items) throws Exception {
                List lines = new ArrayList();
              for (Trade t : items) {
              lines.add("BEGIN");
              lines.add("INFO," + t.getIsin() + "," + t.getCustomer());
              lines.add("AMNT," + t.getQuantity() + "," + t.getPrice());
              lines.add("END");
            }
            this.delegate.write(lines);
     }
    }