How to use WebSession in Spring WebFlux to persist data?

Question

I am trying to develop web application using Spring WebFlux5.0.1 and Spring boot v2.0 M6 version. Requirement is to store objects in session and use it in subsequent pages/controllers.

Controller

@Controller
public class TestController {

    @RequestMapping("/")
    public Mono<String> testSession(Model model,ServerWebExchange swe){
        Mono<WebSession> session = swe.getSession();
        System.out.println("In testSession "+session);

        model.addAttribute("account", new Account());
        return Mono.just("account");
    }
}

I was able to get Websession object from ServerWebExchange but i dont see methods to set/get attributes

Need help to understand how to use WebSession object in reactive world

Please read https://stackoverflow.com/help/how-to-ask on how to ask a question. For starters explain (and add the code) on what you have tried. — M. Deinum, Nov 21 '17 at 07:39

score 3 · Accepted Answer · answered Nov 27 '17 at 11:28

3

Is it what you want to do ?

swe.getSession().map(
    session -> { 
        session.getAttribute("foo"); // GET
        session.getAttributes().put("foo", "bar") // SET
    }
);

answered Nov 27 '17 at 11:28

Jean-Baptiste Lemée

800
7
13

I think this is not complete we may have to return something from here. – Ajay Sharma Jan 11 '19 at 11:18
Also how can I get WebSession out of ServerWebExchange I mean not inside lambda but as a instance variable – Ajay Sharma Jan 11 '19 at 11:48
i tried ur code, but the control is not getting inside map(). what could be the reason – VIJ Feb 01 '21 at 09:03

score 3 · Answer 2 · answered Apr 09 '19 at 09:28

The accepted solution is incomplete in my opinion since it doesn't show the whole controller method, here it is how it would be done:

@PostMapping("/login")
fun doLogin(@ModelAttribute credentials: Credentials, swe: ServerWebExchange): Mono<String> {
    return swe.session.flatMap {
        it.attributes["userId"] = credentials.userId
        "redirect:/globalPosition".toMono()
    }
}

How to use WebSession in Spring WebFlux to persist data?

2 Answers2

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