Spring -MVC 在控制器中使用会话属性

Question

我有一个需要参数名称的方法，我将其设置为会话属性，因为它将在整个会话中得到修复。但是，我无法将其添加到函数中。任何帮助表示赞赏。

设置会话属性的LoginController类

@Controller
@SessionAttributes({"name", "date"})
public class LoginController {

@Autowired
LoginService service;


/*
 *  Map /login to this method 
 *  localhost:8080/spring-mvc/login
 *  spring-mvc -> dispatcher (todo-servlet.xml)
 *  dispatcher detects login url
 *  dispatcher use view resolver to find .jsp file based on String. In this case, login
 *  view resolver locates login.jsp and shows the content to user via http
 */
@RequestMapping(value = "/test")
// Mark this method as an actual repsonse back to user
@ResponseBody
public String test() {
    return "Hello, world!";
}

@RequestMapping(value ="/")
public String returnLogin() {
    return "redirect:/loginPage";
}

// Only handles get request from the login page
@RequestMapping(value = "/login", method= RequestMethod.GET)
public String loginPage() { 
    // search through the view resolver for login.jsp
    return "login";
}

// Only handles post request from the login page
@RequestMapping(value = "/login", method= RequestMethod.POST)
// @RequestParm to be used for user input
// Model is used to supply attributes to views
// ModelMap has the same functionality has model except it has an addition function where it allows a collection of attributes
public String handleLogin(@RequestParam String name, @RequestParam String password, ModelMap model) {
    if (service.validateUser(name, password)) {
    // Send name to .jsp 
    // use addAttrible( nameAtJSP, nameInRequestParam ) to check for null
    model.addAttribute("name", name);
    model.addAttribute("passWelcome", password);
    SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy"); 
    String date = sdf.format(new Date());
    model.addAttribute("date", date);
    }
    
    else {
        model.put("errorMessage","Invalid credentials");
        return loginPage();
    }
    return "welcome";   
}

我的控制器类。我已经注释了我需要添加会话属性的部分。

@Controller
public class ToDoController {
    
    @Autowired
    private ToDoService service;
    
    @RequestMapping(value = "/list-todo", method= RequestMethod.GET)
    public String showToDo(ModelMap model, String name, String date) {
        model.addAttribute("toDos", service.retrieveTodos("in28Minutes"));
        model.addAttribute("name", name);
        model.addAttribute("date", date);
        // Only returns to the jsp
        return "list-todos";
    }
    
    
    @RequestMapping(value = "/add-todo", method= RequestMethod.GET)
    public String addToDo() {
        return "addToDo";
    }
    
    
    @RequestMapping(value = "/add-todo", method= RequestMethod.POST)
    public String addToDo(ModelMap model,@RequestParam String description) {
        // SESSION ATTRIBUTE NAME
        model.addAttribute("name");
        service.addTodo((String) model.get("name"), description, new Date(), false);
        model.clear();
        return "redirect:/list-todo";
    }

Answer 1

@SessionAttributes 没有做你想要达到的目标。

来自@SessionAttributes的javadoc：

注意： 使用此注释指示的会话属性对应 到特定处理程序的模型属性，透明地存储 在会话会话中。这些属性将在 处理程序指示其会话会话的完成。所以， 将此功能用于此类会话属性 应该在会话过程中临时存储在会话中 特定处理程序的对话。

对于永久会话属性，例如一个用户认证对象， 请改用传统的session.setAttribute 方法。

那么，你需要做的是：

public String handleLogin(@RequestParam String name, 
                          @RequestParam String password,
                          ModelMap model,
                          HttpSession httpSession) {

    // your code here
    
    httpSession.setAttribute("name", name);

    // your code here
}
    

然后您可以在ToDoController 中检索此会话属性为httpSession.getAttribute("name");