Using session attributes in spring MVC

Question

I am developing a web application using spring MVC. I just want a simple example of how to do session management in this. I have seen lot of forums but I am not able to get a clear picture of this

My requirement is

I have an object, which I would like to be accessible in all controllers and JSP's I would like to set that in the controller and get that in JSP

I am looking for something like

    Session.setAtribute();

Could you please let me know a very simple instance . Thank you

sinuhepop · Accepted Answer · 2012-08-01 16:58:42Z

2

There are different ways of accessing servlet session in Spring MVC. But I think this one is the one that best suits your problem. You can create a session scoped bean, which holds your desired info:

@Component("myObjectHolder")
@Scope(WebApplicationContext.SCOPE_SESSION)
public class MyObjectHolderImpl implements MyObjectHolder {

    private long userId;
    private String username;
    private Theme theme;

    // Getters & Setter
}

Then, you can access to it from other beans:

@Controller
public class MyController {

    @Autowired private MyObjectHolder myObjectHolder;

    @RequestMapping
    public ModelAndView switchTheme(String themeId) {
        ...
        Theme newTheme = themeService.get(themeId);
        myObjectHolder.setTheme(newTheme);      
        ...
    }

}

You can access directly from your view too, but you must configure it:

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    ...
    <property name="exposedContextBeanNames" value="myObjectHolder" />
</bean>

And in your JSP:

Hi ${myObjectHolder.username}, you switched 
application theme to ${myObjectHolder.theme.name}

edited Aug 1, 2012 at 16:58

answered Aug 1, 2012 at 16:44

sinuhepop

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2 Comments

user1562262 Over a year ago

Thank you for your reply.So MyObjectHolderImpl is where I set my seesion object and I can get it from anywhere rite ,.. COz I dun have to set the session object multiple times, I just need to set it once in one of the controlldersin the My

sinuhepop Over a year ago

@user1562262: No, you probably don't really need to access to session object. You can save desired info (such as user id, name, theme, preferences...) in MyObjectHolder. I'll update my answer.

Tomasz Nurkiewicz · Accepted Answer · 2012-08-01 16:38:39Z

1

The simplest approach is to access HttpSession directly by injecting it into your handler method:

@RequestMapping("/page")           
public ModelAndView page(HttpSession session) {           
    session.getAttribute("foo");
}

answered Aug 1, 2012 at 16:38

Tomasz Nurkiewicz

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2 Comments

user1562262 Over a year ago

Thank s for your reply .. I just want to know like, do I have to inject HttpSession session in the controller that sets the session or both only in the controllers that get the session

Tomasz Nurkiewicz Over a year ago

@user1562262: inject HttpSession whenever you need it :-). Also read a little bit more, there are much more convenient ways to access HTTP session attributes in Spring MVC, but requiring a little bit of setup upfront.

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