How to use Session attributes in Spring-mvc

Could you help me write spring mvc style analog so code in jsp and servlets?

session.setAttribute("name","value");

and how to add element, that annotate by

@ModelAttribute

annotation to session and after get acces to it?

If you want to deleting object after each response no need to session,

If you want keep object during user session , It has some ways:

directly add one attribute to session: declare

HttpSession

as a parameter to your controller method

@RequestMapping(method = RequestMethod.GET)
public String testMestod(HttpServletRequest request){
ShoppingCart cart = (ShoppingCart)request.getSession().setAttribute("cart",value);
return "testJsp";
}

and you can get it from controller like this :

ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");

Make your controller session scoped

@Controller
@Scope("session")

Scope the Objects ,for example you have user object that want be in session every time:

@Component
@Scope("session")
public class User
{
String user;
/*  setter getter*/
}

then inject class in each controller that you want

@Autowired
private User user

that keep class on session.

The AOP proxy injection : in spring -xml:

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd"> 
<bean id="user"    class="com.User" scope="session">
<aop:scoped-proxy/>
</bean>
</beans>

then inject class in each controller that you want

@Autowired
private User user

each one has advantage and disadvantage:

@session

may use more memory in cloud systems it copies session to all nodes, and direct method has messy approach, it is not good to unit test.

The below annotated code would set “value” to “name”

@RequestMapping("/testing")
@Controller
public class TestController {
@RequestMapping(method = RequestMethod.GET)
public String testMestod(HttpServletRequest request){
request.getSession().setAttribute("name", "value");
return "testJsp";
}
}

To access the same in JSP use

${sessionScope.name}

.

SessionAttribute

annotation is the simplest and straight forward instead of getting session from request object & setting attribute… Any object can be added to the model in controller and it will stored in session if its name matches with the argument in

@SessionAttributes

annotation. In below eg,

personObj

will be available in session.

@Controller
@SessionAttributes("personObj")
public class PersonController {

@RequestMapping(value="/person-form")
public ModelAndView personPage() {
return new ModelAndView("person-page", "person-entity", new Person());
}

@RequestMapping(value="/process-person")
public ModelAndView processPerson(@ModelAttribute Person person) {
ModelAndView modelAndView = new ModelAndView();
modelAndView.setViewName("person-result-page");

modelAndView.addObject("pers", person);
modelAndView.addObject("personObj", person);

return modelAndView;
}

}