I want to create a final variable, but get its value from a session started, for example
final static String variable = (String) new HttpServletRequest.getSession().getAttribute("codigoVerificacion");I hope you can help me, since that code marks error.
I do not know why you do new HttpServletRequest when the request should already be defined
String codigoVerificacion = (String)request.getAttribute("codigoVerificacion");
In Spring, you can use @SessionAttributes , to put the object to the session first, as shown below:
@Controller
@SessionAttributes({"estudiante"})
public class Three {
@RequestMapping(value = "/", method = RequestMethod.GET)
public String printWelcome(ModelMap model) {
EstudianteDTO estudiante = new EstudianteDTO();
estudiante.setNombre("Juan");
model.addAttribute("greeting", "Hola");
model.addAttribute("estudiante",estudiante);
return "holamundo";
}
}
This is the DTO:
public class EstudianteDTO implements Serializable {
private static final long serialVersionUID = -5801289994733718288L;
private String nombre;
public String getNombre() {
return nombre;
}
public void setNombre(String nombre) {
this.nombre = nombre;
}
}
And to obtain the student attribute of the session with @SessionAttributes and @ModelAttribute in another Controller as follows:
@Controller
@SessionAttributes({"estudiante"})
public class Obtener {
@RequestMapping(value="/obtener.htm", method=RequestMethod.GET)
public String handleRequest(ModelMap model,@ModelAttribute("estudiante") EstudianteDTO estudiante){
String datoNombre = "Nombre Estudiante:"+estudiante.getNombre();
model.addAttribute("datoNombre", datoNombre);
return "hola";
}
}
to use it in a jsp, as shown below:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>HelloWorld page</title>
</head>
<body>
Hola: ${estudiante.nombre}
</body>
</html>