Passing the List of primitive type objects as datasource for subreport

Question

I need to pass to my subreport a dataSource with help of master report\'s List parameter. I don\'t know what is

Answer 1

You can use this datasource expression for passing java.util.List (via parameter) to subreport:

The working sample, master report:

    
    
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The subreport:

The Java code for passing List:

Map params = new HashMap();

List beansList = new ArrayList();

// The TestBean class constructor is: 
//public TestBean(String city, Integer id, String station)
TestBean bean = new TestBean("Dallas", 10, "Central park st.");
beansList.add(bean);

bean = new TestBean("Dallas", 11, "Railway st.");
beansList.add(bean);

bean = new TestBean("Dallas", 12, "Market st.");
beansList.add(bean);

bean = new TestBean("Lyon", 20, "Airport st.");
beansList.add(bean);

params.put("listParam", beansList);

JasperReport jasperReport = JasperCompileManager.compileReport(reportSource);
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params, getDemoHsqldbConnection());

JasperExportManager.exportReportToPdfFile(jasperPrint, outputFileName);

The result will be (view of generated PDF file):

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You can look at the implementations of net.sf.jasperreports.engine.JRDataSource. The most appropriate for your case are: JRBeanCollectionDataSource and JRBeanArrayDataSource. As you can see they are both Bean-based.

I think you can easily convert your List to the List.

Or you can implement your own JRDataSource.