How to print all invoiceIds and loop them using ireport

Question

I have created a report to print details. I need to print all the invoiceIds in the same document and loop through them, but I cannot find a way to do it. How do I

Answer 1

You could change you report (query and structure), to take the List<Integer> as parameter and then generate all the invoice in same report, to generate a new page for every invoice you group on idInvoice and set group to page break, <group name="idInvoice" isStartNewPage="true"></group>.

However a pure java approach to avoid modifying the report is adding all the pages of multiple single id report to a single JasperPrint object

Example

//Method to add multiple single id report to single JasperPrint
public JasperPrint getMultipleIdReport(List<Integer> idInvoiceList, JasperReport report) throws JRException { 
  List<JasperPrint> printList = new ArrayList<JasperPrint>();
  for (Integer id : idInvoiceList) {
    printList.add(getSingleIdReport(id, report));
  }

  JasperPrint printFinal = null;
  for (JasperPrint jp : printList) {
    if (printFinal == null) {
        printFinal = jp;
    } else {
        List<JRPrintPage> pages = jp.getPages();
        for (JRPrintPage page : pages) {
            printFinal.addPage(page);
        }
    }
  }
  return printFinal;
}

//Method to get a single id report, similar to your current code
public JasperPrint getSingleIdReport(int idInvoice, JasperReport report) throws JRException {
   //fill the parameter and the return the the JasperPrint for single id
   return JasperFillManager.fillReport(report, parameters, connection);
}