Merge multiple Jasper Reports in to Single Report

If you are working with Jasper Reports and JAVA you should meet with this problem

[jasperreports-questions] Merge multiple JasperPrint Objects

Mon, 16 Apr 2007 04:55:31 -0700
I just want to show several JasperPrint Objects in only one JRViewer. Is
there a function to concat 2 or more JasperPrint Objects to one JasperPrint
Object? or something like that?

In pseudo code:
JasperPrint jp1 = JasperFillManager.fillReport(url.openStream(), parameters,
                    new JRBeanCollectionDataSource(inspBean));
JasperPrint jp2 = JasperFillManager.fillReport(url.openStream(), parameters,
                    new JRBeanCollectionDataSource(inspBean));
JasperPrint jp = jp1+jp2

jrviewer= new JRViewer(jp);

I hope its clear what i mean.
Thanks for your help!


a slimier question is [update] http://stackoverflow.com/questions/2666001/how-to-merge-two-pdf-documents-into-a-single-report-in-jasperreports/8278526#8278526

unfortunately the solution is build a sub report and use the 2 different DataSource or what ever connection you used

but there is an easy way to get over with this question :D
just simple no new reports ..... Wolaah

ok lets do it

JasperPrint jp1 = JasperFillManager.fillReport(url.openStream(), parameters,
                    new JRBeanCollectionDataSource(inspBean));
JasperPrint jp2 = JasperFillManager.fillReport(url.openStream(), parameters,
                    new JRBeanCollectionDataSource(inspBean));

ok we have over 2 records ..lets take our first record  jp1 and add jp2 content into it
List pages = jp2 .getPages();
            for (int j = 0; j < pages.size(); j++) {
            JRPrintPage object = (JRPrintPage)pages.get(j);

This work like a charm .. with couple of loops you can merge any number of report together .. without creating new reports  

Questions are welcome


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Anonymous said...

This only works if the page dimensions are the same for both reports. It doesn't work if the first report is portrait and the second report is landscape.

Mikl said...

For the portait/landscape problem, I find this solution : http://ngjweb.wordpress.com/2011/12/09/fix-jasper-report-multi-oriented-pages/
Hope it will help you !

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Fernando Zimmermann said...

Man, aweasome! works fine:

* passar por parametro relatorios a serem concatenados
* referencia eh alterada
* @param relatorios
* @return
* @throws Exception
public static byte[] juntarRelatorios(List relatorios) throws Exception {
JasperPrint primeiro = relatorios.remove(0);
for (JasperPrint jp : relatorios) {
List pages = jp.getPages();
for (JRPrintPage page : pages) {
return JasperExportManager.exportReportToPdf(primeiro);

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