Clase para la Conexion de Netbeans con Postgres

package proyecto;
import java.sql.*;
public class DatosBD
{
static String baseDatos = "nombreBD";
static String puerto = "5432";
static String usuario = "postgres";
static String clave = "contraaseña";
static String ip = "localhost";


public static ResultSet consultar (String consulta) throws Exception
{
ResultSet reg = null; Connection conex = null;
Statement SQL = null;
try
{
conex=conexion();
SQL = conex.createStatement (ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
reg = SQL.executeQuery(consulta);
} catch (Exception e){}
return reg;
}
public static Connection conexion()
{
Connection conex = null;
String URL = "jdbc:postgresql://localhost:5432/nombreBD";

try
{
Class.forName("org.postgresql.Driver" ;.
conex = DriverManager.getConnection(URL,"postgres", "contraseña" ;.
} catch (ClassNotFoundException ex) {System.out.println(ex.getMessage());}
catch(SQLException ex){System.out.println(ex.getMessage());}
return conex;
}
public int ejecutar(String consulta)
{
int conclusion = -1;
Connection conex;Statement sql = null;
try
{
conex = conexion();
sql = conex.createStatement();
sql.executeUpdate(consulta);
sql.close();conex.close();
conclusion = 1;
}catch(SQLException ex){System.out.println(ex.getMessage());}
catch(Exception ex){System.out.println(ex.getMessage());}
return conclusion;

}
public static boolean verificar(String x, String campo, String tabla)
{
ResultSet reg;
try
{
String consulta = "Select count ("+campo+" ) from "+tabla+" where "+campo+" = '"+x+"'";
reg = consultar(consulta);
reg.first();
int n = reg.getInt(1);
if (n>0)
{ return true; }
else
{ return false;}
}catch(Exception e){}
return false;
}
public ResultSet Registros(String consulta)
{
ResultSet reg=null;Connection conex=null;
Statement sql=null;
try
{
conex=conexion();
sql=conex.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
reg=sql.executeQuery(consulta);
}catch(Exception e){}
return reg;
}
}