Create a Report using Jasper Reports in Java

The report is very important to a program. It will help view the data from MySQL database or any database you are using in a paper format.

When using this feature, you can view and generate the report into pdf, word, and excel file format. This means that you cannot depend on the data stored in your database because by using this feature, you can generate and print the data directly to a paper and become your hard copy data.

In this tutorial, I am using Jasper reports together with my Netbeans IDE so that this feature works properly. You can download the standalone jasper reports and install it to your computer or you can add it as plugins from your Netbeans using your downloaded plugins with nbm format.

Before anything else, make sure that you already created your report using your Jasper Reports plugins or installer. This tutorial shows only the code on how to display a report using Jasper in Java. When generating your report, it will create a file with .jasper file format. We use that format in viewing the report. If you need to change the report, you can edit the .jrxml file and complied again to generate or create a new .jasper file.

Code for accessing Jasper Libraries.

	import net.sf.jasperreports.engine.JRException;
	import net.sf.jasperreports.engine.JasperFillManager;
	import net.sf.jasperreports.engine.JasperPrint;
	import net.sf.jasperreports.swing.JRViewer;

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Code for viewing the report.

	String reportName = "yourproject/report1.jasper";
	InputStream is = this.getClass().getClassLoader().getResourceAsStream(reportName);
	HashMap hm = new HashMap();
	hm.put("lastname", city.getSelectedItem().toString());
	JasperPrint jp;
	try {
	jp = JasperFillManager.fillReport(is, hm, conn);
	JRViewer jv = new JRViewer(jp);
	JInternalFrame bl = new JInternalFrame();
	JDesktopPane desktopPane = getDesktopPane();
	desktopPane.add(bl);
	bl.getContentPane().add(jv);
	bl.setVisible(true);
	bl.setSize(new Dimension(1024,600));
	bl.setClosable(true);
	bl.setTitle("Report Viewer");
	} catch (JRException ex) {
	Logger.getLogger(Reports.class.getName()).log(Level.SEVERE, null, ex);
	}

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The code uses HashMap, it will help to identify the data in WHERE section from your MySQL database. The code also uses JInternalFrame to display the report form.

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