JasperReports: How to call the report in jsp page

I made one jasper report using iReport 3.7.4 version, now i have to use that or call that report in my java application where i am using servlets, jsp and struts framework, apache tomcat as server.

I want steps regarding how to call the jasper report with some example.

1. Compile the report in iReport
2. Place the compiled report on the classpath

3. load it with

   JasperReport jasperReport = (JasperReport) JRLoader.loadObject(inputStream);
   

4. Fill it with data. dataSource is the DataSource instance you have - for example a BeanCollectionDataSource

   JasperPrint jasperPrint = 
        JasperFillManager.fillReport(jasperReport, params, dataSource);
   

5. Export it

   JRPdfExporter exporter = new JRPdfExporter();
   exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, outputStream);
   exporter.exportReport();
   

6. The outputStream above may be either a response.getOutputStream() or a FileOutputStream(), depending on whether you want to send it to a client or you want to store it as a file. If you want to send it to the client, you'd have to send the Content-Disposition header, and some more, but that depends on the format you want to save to. In case you want to print on the client, it's quite a different question - you'd need some client-side code, an applet, for example.

After 6 years @Bozho answer now (v5 and v6) contains deprecated code on point 5 JRExporterParameter.OUTPUT_STREAM, but I will try to improve the other points while I'm at it

3. Load the report
   
   compiled version .jasper

   JasperReport jasperReport = (JasperReport) JRLoader.loadObject(inputStream);
   

   or the non compiled version .jrxml (slower since need to compile but feasible)

   JasperReport jasperReport = JasperCompileManager.compileReport("path/to/myReport.jrxml");
   

4. Fill the report
   
   with nothing (datasource generated inside report or just static text)

   JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params);
   

   with datasource:

   JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params, dataSource);
   

   with database connection (may the most common, sql executed inside report)

   JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params, connection);
   

5. Export report
   
   

   JRPdfExporter exporter = new JRPdfExporter()
   exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
   exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(outputStream));
   SimplePdfExporterConfiguration configuration = new SimplePdfExporterConfiguration();
   configuration.setMetadataAuthor("Petter"); //Set your pdf configurations, 
   exporter.setConfiguration(configuration);
   exporter.exportReport();
   

6. If you like to stream the report directly to web page this is how contentType and Content-disposition is set and how you retrieve the outputStream
   
   

   response.setContentType("application/x-pdf");
   response.setHeader("Content-disposition", "inline; filename=myReport.pdf");
   OutputStream outputStream = response.getOutputStream();
   

This piece of code should give you some idea on how to do it

JasperReport jr=JasperCompileManager.compileReport("yourJRXMLFilePath");
JasperPrint jrPrint = JasperFillManager.fillReport(jr,mapWithParameters,aJRDataSource);
JasperExportManager.chooseYourFavoriteMethod(jrPrint,"destinationFile");

Otherwise, check the api The first line can be ommited if you had already compiled the file with iReport. Check the api for the correct method on JasperFillManager in this case.