import net.sf.jasperreports.view.JasperViewer;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperManager;
import net.sf.jasperreports.engine.JasperReport;
import java.sql.*;
import java.util.*;
import java.net.URL;

public class Relatório {
    private JasperViewer jasper;

    /** Creates a new instance of Relatório */
    public Relatório() {
 //       JasperPrint impressao = JasperFillManager.fillReport(getClass().getResourceAsStream("teste"), parâmetros, ds);
        ok();
    }

    public void ok()
   {
      try
      {
        Class.forName("org.postgresql.Driver");
        Connection con = DriverManager.getConnection("jdbc:postgresql://inf.upf.br/dbxxxxx","xxxx","xxxx");
        Statement st=con.createStatement();
        st.execute("SET search_path = postosaude, pg_catalog;");
        ResultSet rs=st.executeQuery("SELECT * FROM PACIENTE");

        HashMap parametros=new HashMap();
        URL urlFile = getClass().getClassLoader().getResource("classic.jrxml");

        JasperPrint impressao=JasperManager.fillReport(getClass().getResourceAsStream("classic.jrxml"),parametros,con);
        JasperViewer viewer=new JasperViewer(impressao,true);
        viewer.setTitle("Relatório de Turmas");
        viewer.setBounds(0,0,400,300);
        viewer.show();

        st.close();
        con.close();
     }
     catch(Exception e)
     {
        System.out.println(e);
        e.printStackTrace();
     }
 }

    public static void main(String args[])
    {
        Relatório r = new Relatório();
    }

}