JasperReport

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.HashMap;

import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.util.JRLoader;

public class DopisGenerator {

    public static void main(String[] args) {
        long startTime = System.currentTimeMillis();
        new DopisGenerator().generateReport();
        long estimatedTime = System.currentTimeMillis() - startTime;
        System.out.println("Doba generovani: " + (float) estimatedTime/1000 + "s.");
    }

    public void generateReport() {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            String URL = "jdbc:mysql://localhost/pro3";
            String JMENO = "pro3";
            String HESLO = "pro3";
            Connection db = DriverManager.getConnection(URL, JMENO, HESLO);

            // kompilace sablony:
            // JasperReport jasperReport = JasperCompileManager.compileReport("dopis.jrxml");

            // nacteni zkompilovane sablony:
            JasperReport jasperReport = (JasperReport) JRLoader.loadObjectFromFile("dopis.jasper");

            // nastaveni promennych:
            HashMap<String, Object> hm = new HashMap<String, Object>();
            hm.put("RTF_TEXT", "text.rtf");
            hm.put("JMENO", "Ahoj svete");

            JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, hm, db);

            // export do souboru
            JasperExportManager.exportReportToPdfFile(jasperPrint, "dopis.pdf");
            JasperExportManager.exportReportToHtmlFile(jasperPrint, "dopis.html");

            db.close();
        } catch (JRException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}