The part 1 was a comprehensive beginner style Jasper Reports tutorial. This extends that to demonstrate how to pass parameters via a Map using name/value pairs to the Jasper Reports.
Step 1: Add a new custom parameter named "footerText" to display some value in the page footer section. Right-click on "Parameters" and select "Add Parameter" and then rename it to "footerText" as shown below. Also, note than the Text Field in the page footer is mapped to $P{footerText} by right clicking on the "Text Field" and then select "Edit expression" to select the parameter "footerText" from the list.
Step 2: Compile this to the jrxml file and then you can pass the value for "footerText" via Java as shown below in the Main.java file. Take note of the getParameters( ) method.
package com.mycompany.app.jasper; import java.io.IOException; import java.io.InputStream; import java.util.Collection; import java.util.LinkedList; import java.util.List; import net.sf.jasperreports.engine.JRException; import net.sf.jasperreports.engine.JasperCompileManager; import net.sf.jasperreports.engine.JasperFillManager; import net.sf.jasperreports.engine.JasperPrint; import net.sf.jasperreports.engine.JasperReport; import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource; import net.sf.jasperreports.engine.design.JasperDesign; import net.sf.jasperreports.engine.xml.JRXmlLoader;
package com.mycompany.app.jasper;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.design.JasperDesign;
import net.sf.jasperreports.engine.xml.JRXmlLoader;
import net.sf.jasperreports.view.JasperViewer;
public class Main
{
public static JasperDesign jasperDesign;
public static JasperPrint jasperPrint;
public static JasperReport jasperReport;
public static String reportTemplateUrl = "person-template.jrxml";
public static void main(String[] args) throws IOException
{
try
{
InputStream resourceAsStream = Thread.currentThread().getContextClassLoader()
.getResourceAsStream(reportTemplateUrl);
//get report file and then load into jasperDesign
jasperDesign = JRXmlLoader.load(resourceAsStream);
//compile the jasperDesign
jasperReport = JasperCompileManager.compileReport(jasperDesign);
//fill the ready report with data and parameter
jasperPrint = JasperFillManager.fillReport(jasperReport, getParameters(),
new JRBeanCollectionDataSource(
findReportData()));
//view the report using JasperViewer
JasperViewer.viewReport(jasperPrint);
}
catch (JRException e)
{
e.printStackTrace();
}
}
private static Collection findReportData()
{
//declare a list of object
List<Person> data = new LinkedList<Person>();
Person p1 = new Person();
p1.setFirstName("John");
p1.setSurname("Smith");
p1.setAge(Integer.valueOf(5));
data.add(p1);
return data;
}
private static Map<String, Object> getParameters()
{
Map<String, Object> params = new HashMap<String, Object>();
params.put("footerText", "Just to demonstrate how to pass parameters to report");
return params;
}
}
Step 3: Finally, run the Main.java to see the value "Just to demonstrate how to pass parameters to report" in the report footer. The parameters are handy to pass any arbitary name/value pairs to the report.
