Using JavaBeans as datasource

[olu_guy]

Hi All, this question has been asked several times on this forum and other forums but unfortunately there's been no post (s) that actually provides a proper example or solution.

 

I am trying to use javabeans as the datasource for my jasper reports. Does anyone have an example on how to implement this step by step ? I have seen some examples but none of them addresses the problem or provide a step by step guide.

 

If there links to tutorials on using javabeans as a datasource in ireports or jasper reports that will be fully appreciated.

 

Cheers.

[rsilverns.sympatico.ca]

To use java beans is fairly straight forward. Just create either a collection or an array of the bean object and encapsulate that in either a JRBeanArrayDataSource or JRBeanCollectionDataSource. Just make sure the object your encapsulating adheres to the beans standard...

1. No public visibility fields

2. Properly named getter/setter methods.

3. Default no-args c-tor

 

To fill your report, you would have something like...

 

 

 

Code:

	ArrayList al = new ArrayList();
		al.add(new SomeBean("SomeParam"«»));
		al.add(new SomeBean("SomeParam"«»));
		al.add(new SomeBean("SomeParam"«»));
		al.add(new SomeBean("SomeParam"«»));
		al.add(new SomeBean("SomeParam"«»));
		al.add(new SomeBean("SomeParam"«»));
		al.add(new SomeBean("SomeParam"«»));
			
		JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(al);
	
		
		 JasperReport jasperReport;
		 JasperPrint jasperPrint;
		    try
		    {
			    	
		      jasperReport = JasperCompileManager.compileReport(ROOT_DIR + "myReport.jrxml"«»);
		      Map customParameters = new HashMap(); 
		      
				  jasperPrint = JasperFillManager.fillReport(
						  		jasperReport, customParameters, ds);
				  
		      JasperExportManager.exportReportToPdfFile(
		          jasperPrint, "c:\test_output.pdf"«»);
		      
		    }
		    catch (JRException e)
		    {
			  e.printStackTrace();
		    }

 

HTH,

Robin

[rsilverns.sympatico.ca]

As a follow-up...

 

the fields in your report would be the field names in the bean objects. As well, if you have a sub-report you can pass a collection/array of beans field to the sub-report as its own datasource by using the datasource expression of "new JRBeanCollectionDataSource($F{someBeanList}).

 

HTH,

Robin

[olu_guy]

Thanks robin, I will implement the solution using the guide as provided by you. I dont thnik I will run into problems. That looks to be simple and easy and not complicated as I first thought. I'll write up a manual afterwards so people can benefit from such an example.

 

Cheers.

[midrag]

a sample with nested Beans and Subreports can be found here:

 

here.