在Spring的Session / HttpSession对象中存储对象列表

Question

Hi all i want to store list of objects in session object. To store 1 obj i've got this code:

@Controller
@SessionAttributes("temp")
@RequestMapping(value = "/test")
public class TestController {
    @ModelAttribute("temp")
    public Temp setObj() {
        return new Temp();
    }

    @RequestMapping(method = RequestMethod.GET)
    public String test(Model model) {
        model.addAttribute("temp", new Temp());
        return "testInput";
    }

    @RequestMapping()
    public String add(@ModelAttribute("temp") Temp temp, Model model) {
        model.addAttribute("temp", temp);
        return "test";
    }

    @RequestMapping(value = "/get") // or "/getList" to ensure it works
    public String kek(@ModelAttribute("temp") Temp temp, Model model) {
        model.addAttribute("temp", temp);
        return "test";
    }
}

Where

class Temp implements Serializible {
    //constructor fields, methods
} 

PS storing 1 object works fine.

But how can i store List<Temp> in Session object and add extra Temp obj with controller? Or maybe i should use smth like:

class TempList {
    private List<Temp> list
    //constructor, get/set addToList methods
}

If yes, how can i init this class and use tempListObj.addToList(Temp temp) method?

Answer 1

For your information if your store object into session with @SessionAttributes annotation so this object will be available only in scope of this controller. If you want to store List to session, you can just define @SessionAttributes({"temp"}) on class level, and set this into session in any controller method like this:

model.addAttribute("temp", new ArrayList<Temp>());

Then you can get access to this by this way:

public String someMethod(@ModelAttribute("temp") List<Temp> temp) {...}