Relatório JasperAssistent

import javax.swing.JPanel;

import java.awt.GraphicsConfiguration;

import java.awt.HeadlessException;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

import javax.swing.JFrame;

import javax.swing.JButton;

import javax.swing.JOptionPane;

import <a href="http://java.io">java.io</a>.*;

private static final long serialVersionUID = 1L;
private JPanel jContentPane = null;
private JButton btAbreRel = null;

public SistemaRelatorio() throws HeadlessException {
	super();
	// TODO Auto-generated constructor stub
	initialize();
}

public SistemaRelatorio(GraphicsConfiguration gc) {
	super(gc);
	// TODO Auto-generated constructor stub
	initialize();
}

public SistemaRelatorio(String title) throws HeadlessException {
	super(title);
	// TODO Auto-generated constructor stub
	initialize();
}

public SistemaRelatorio(String title, GraphicsConfiguration gc) {
	super(title, gc);
	// TODO Auto-generated constructor stub
	initialize();
}
private Connection getConnection( )
{
	Connection con=null;
	try{
	String driver="org.gjt.mm.mysql.Driver";
	String url= "jdbc:mysql://localhost/livraria";
	String user="root";
	String password="v6d3v6";
	Class.forName(driver);
	con = DriverManager.getConnection( url, user, password );
	}
	catch(ClassNotFoundException cnf){mostrarErro("Erro ao se conectar");}
	catch(SQLException sqlex){mostrarErro("Erro ao se conectar");}
	
	return con;
}
private void abreRelatorio( ) throws JRException, Exception
{
	Connection con = getConnection( );

	Map parameters = new HashMap();

	[b]String path = "relatorios/primeiro_relatorio.jasper"[/b];
    File file = new File(path);
    file = file.getAbsoluteFile();
    String repStr2 = file.getPath();
    
    //mostrarErro("Path: "+file);
    
    try{
    	

    	JasperFillManager.fillReportToFile( repStr2, parameters, con );
    	JasperPrint jasperPrint = JasperFillManager.fillReport(repStr2,parameters,con);

	JasperViewer viewer = new JasperViewer(jasperPrint, false);
    viewer.setVisible(true);

    }
    catch(JRException jex){
    	mostrarErro("JasperException: "+jex.getMessage());
    }
    catch(Exception ex){
    	mostrarErro(""+ex.getStackTrace());
    }


}
/**
 * This method initializes btAbreRel	
 * 	
 * @return javax.swing.JButton	
 */
private JButton getBtAbreRel() {
	if (btAbreRel == null) {
		btAbreRel = new JButton();
		btAbreRel.setBounds(new java.awt.Rectangle(78,58,123,40));
		btAbreRel.setText("Abre Relatório");
		btAbreRel.addActionListener(new java.awt.event.ActionListener() {
			public void actionPerformed(java.awt.event.ActionEvent e){
				try{
					abreRelatorio( );
				}
				catch(JRException jre){
					mostrarErro("JasperException: "+jre.getMessage());
				}
				catch(Exception ex){
					mostrarErro(""+ex.getStackTrace());
				}
			}
		});
	}
	return btAbreRel;
}

/**
 * @param args
 */
public static void main(String[] args) {
	new SistemaRelatorio().setVisible(true);

}

/**
 * This method initializes this
 * 
 * @return void
 */
private void initialize() {
	this.setSize(300, 200);
	this.setContentPane(getJContentPane());
	this.setTitle("Relatório de Livros");
	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
    java.awt.Dimension frameSize = this.getSize();
    if (frameSize.height > screenSize.height) {
      frameSize.height = screenSize.height;
    }
    if (frameSize.width > screenSize.width) {
      frameSize.width = screenSize.width;
    }
    this.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
}

/**
 * This method initializes jContentPane
 * 
 * @return javax.swing.JPanel
 */
private JPanel getJContentPane() {
	if (jContentPane == null) {
		jContentPane = new JPanel();
		jContentPane.setLayout(null);
		jContentPane.add(getBtAbreRel(), null);
	}
	return jContentPane;
}
private void mostrarErro(String msg) {
	JOptionPane.showMessageDialog(
	  null,
    msg,
    "Erro encontrado",
    JOptionPane.ERROR_MESSAGE);
}