How to merge multiple reports into a single report in JasperReports

import java.io.FileOutputStream;

import java.util.ArrayList;

import java.util.HashMap;

import net.sf.jasperreports.engine.JREmptyDataSource;

import net.sf.jasperreports.engine.JRExporter;

import net.sf.jasperreports.engine.JRParameter;

import net.sf.jasperreports.engine.JRPrintPage;

import net.sf.jasperreports.engine.JasperFillManager;

import net.sf.jasperreports.engine.JasperPrint;

import net.sf.jasperreports.engine.JasperReport;

import net.sf.jasperreports.engine.export.JRPdfExporter;

import net.sf.jasperreports.engine.export.JRPdfExporterParameter;

import net.sf.jasperreports.engine.fill.JRFileVirtualizer;

import net.sf.jasperreports.engine.util.JRLoader;

public class JasperReportMerge {

ArrayList reportsList = new ArrayList();

HashMap params = new HashMap();

JasperPrint jrPrint = new JasperPrint();

public void buildReport() throws Exception {

String templateFile = "C://Testing//MergeReportTemplate.jasper";

JasperReport jrReport = (JasperReport) JRLoader.loadObject(templateFile);

JRFileVirtualizer virtualizer = null;

JasperPrint jp = null;

for(int i=0; i<5; i++) {

virtualizer = new JRFileVirtualizer(2, "C://tmp");

virtualizer.setReadOnly(true);

params.put(JRParameter.REPORT_VIRTUALIZER, virtualizer);

// Create dummy data for the each report

params.put("name", "Hello " + i);

params.put("ic", "IC " + i);

params.put("address", i + " Address");

jp = JasperFillManager.fillReport(jrReport, params, new JREmptyDataSource());

reportsList.add(jp); // adding the report into list

// Clean the virtualizer.

// If you didnt clean it, you might encounter error such as

// "The virtualizer is used by more contexts than its in-memory cache size XXX"

virtualizer.cleanup();

}

if (reportsList != null && reportsList.size() > 0) {

jrPrint = mergeReport(); // merge the report

} else {

jrPrint = JasperFillManager.fillReport(jrReport, params, new JREmptyDataSource());

}

exportReport();

}

protected JasperPrint mergeReport() throws Exception {

JasperPrint jrPrint = new JasperPrint();

JasperPrint jp = null;

jp = (JasperPrint) reportsList.get(0);

// set the report layout

jrPrint.setOrientation(jp.getOrientation());

jrPrint.setLocaleCode(jp.getLocaleCode());

jrPrint.setPageHeight(jp.getPageHeight());

jrPrint.setPageWidth(jp.getPageWidth());

jrPrint.setTimeZoneId(jp.getTimeZoneId());

jrPrint.setName(jp.getName());

// get each report and merge it 1 by 1

for(int i=0; i<reportsList.size(); i++) {

jp = (JasperPrint) reportsList.get(i);

ArrayList list = (ArrayList) jp.getPages();

// Merging the reports into 1 single report

for(int j=0; j

jrPrint.addPage((JRPrintPage) list.get(j));

}

}

return jrPrint;

}

protected void exportReport() throws Exception {

FileOutputStream fileOut = new FileOutputStream("C://Testing//MergeReportTemplate.pdf");

JRExporter exporter = new JRPdfExporter();

exporter.setParameter(JRPdfExporterParameter.FORCE_LINEBREAK_POLICY, Boolean.TRUE);

exporter.setParameter(JRPdfExporterParameter.OUTPUT_STREAM, fileOut);

exporter.setParameter(JRPdfExporterParameter.JASPER_PRINT, jrPrint);

System.out.println("Exporting...");

exporter.exportReport();

fileOut.flush();

fileOut.close();

}

public static void main(String[] args) throws Exception {

JasperReportMerge jem = new JasperReportMerge();

jem.buildReport();

System.out.println("Done");

}

}

Compile Basic JasperReports in Java

I used to compile JasperReports in iReport and deploy the .jasper file to production, instead of .jrxml file.

Recently my company request me to change to compilation from iReport to java code. I not sure why they want to change. The changes should be very simple and easy but it took me few days to find out how to compile JasperReports in java.

See below sample code to compile .jrxml file in java. Remember to add iText, JasperReports and jdt-compiler jar files into classpath. Without jdt-compiler jar file you can't compile.

public class BasicJasperReportTest {

public static void main(String[] args) {

try {

JasperDesign jasperDesign = JRXmlLoader.load("C:/report1.jrxml");

JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);

JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, new HashMap(), new JREmptyDataSource());

JasperExportManager.exportReportToPdfFile(jasperPrint,"C:/report1.pdf");

JasperViewer.viewReport(jasperPrint);

} catch (JRException e) {

e.printStackTrace();

}

}

}