Xls ireport

Programação Java
#1

como gerar arquivo excel utilizando o ireport o que devo alterar no CODIGO.:

[code]
import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.HashMap;import java.util.Map;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRResultSetDataSource;
import net.sf.jasperreports.engine.JasperCompileManager;
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.design.JasperDesign;
import net.sf.jasperreports.engine.xml.JRXmlLoader;
import net.sf.jasperreports.view.JasperViewer;

public class relat_calculos {

private static final String url = "org.postgresql.Driver";
private static final String driver = "jdbc:postgresql://localhost/saidas";
private static final String login = "postgres";
private static final String pwd = "4545";

public relat_calculos() {
}

public void gerar( String layout ) throws JRException , SQLException, ClassNotFoundException {
	//gerando o jasper design
	JasperDesign desenho = JRXmlLoader.load( layout );

	//compila o relatório
	JasperReport relatorio = JasperCompileManager.compileReport( desenho );

	//estabelece conexão
	Class.forName( driver );
	Connection con = DriverManager.getConnection( url , login , pwd );
	Statement stm = con.createStatement();
	String query = "select * from calculos";
	ResultSet rs = stm.executeQuery( query );

	//implementação da interface JRDataSource para DataSource ResultSet
	JRResultSetDataSource jrRS = new JRResultSetDataSource( rs );

	//executa o relatório
	Map parametros = new HashMap();
	parametros.put("nota", new Double(10));
	JasperPrint impressao = JasperFillManager.fillReport( relatorio , parametros,    jrRS );

	//exibe o resultado
	//JasperViewer viewer = new JasperViewer( impressao , true );
	//viewer.show();
            JasperExportManager.exportReportToPdfFile( "tested.pdf" );

}

public static void main(String[] args) {
	try {
		new relat_calculos().gerar( "Calculos.jasper" );
	} catch (Exception e) {
		e.printStackTrace();
	}
}

}[/code]

#2