Spring 3.0设置并获取会话属性 [英] Spring 3.0 set and get session attribute

问题描述

我想从会话范围读取域对象（UserVO）。

I want to read a domain object (UserVO) from session scope.

我在名为WelcomeController的控制器中设置UserVO

I am setting the UserVO in a controller called WelcomeController

@Controller
@RequestMapping("/welcome.htm")
public class WelcomeController {
@RequestMapping(method = RequestMethod.POST)
    public String processSubmit(BindingResult result, SessionStatus status,HttpSession session){
      User user = loginService.loginUser(loginCredentials);
     session.setAttribute("user", user);
         return "loginSuccess";
    }
}

我能够在jsp页面中使用该对象< h1> $ {user.userDetails.firstName}< / h1>

I am able to use the object in jsp pages <h1>${user.userDetails.firstName}</h1>

但我无法从另一个Controller读取值，

But I am not able to read the value from another Controller,

我正在尝试读取会话属性，如下所示：

I am trying to read the session attribute as follows:

@Controller
public class InspectionTypeController {
@RequestMapping(value="/addInspectionType.htm", method = RequestMethod.POST )
 public String addInspectionType(InspectionType inspectionType, HttpSession session)
 {
           User user = (User) session.getAttribute("user");
           System.out.println("User: "+ user.getUserDetails().getFirstName);

        }
} 

推荐答案

您显示的代码应该工作 - HttpSession 在控制器之间共享，并且您使用相同的属性名称。因此，你没有向我们展示其他东西。

The code you've shown should work - the HttpSession is shared between the controllers, and you're using the same attribute name. Thus something else is going wrong that you're not showing us.

然而，无论它是否有效，Spring提供了一种更优雅的方法来保存模型对象在会话中，使用 @SessionAttribute 注释（参见 docs ）。

However, regardless of whether or not it works, Spring provides a more elegant approach to keeping your model objects in the session, using the @SessionAttribute annotation (see docs).

例如（我还没有）测试了这个，但它给你的想法）：

For example (I haven't tested this, but it gives you the idea):

@Controller
@RequestMapping("/welcome.htm")
@SessionAttributes({"user"})
public class WelcomeController {
    @RequestMapping(method = RequestMethod.POST)
    public String processSubmit(ModelMap modelMap){
       User user = loginService.loginUser(loginCredentials);
       modelMap.addtAttribute(user);
       return "loginSuccess";
    }
}

然后

@Controller
@SessionAttributes({"user"})
public class InspectionTypeController {

   @RequestMapping(value="/addInspectionType.htm", method = RequestMethod.POST )
   public void addInspectionType(InspectionType inspectionType, @ModelAttribute User user) {
      System.out.println("User: "+ user.getUserDetails().getFirstName);
   }
} 

但是，如果您的原始代码不起作用，然后这也不会起作用，因为你的会话有其他问题。

However, if your original code isn't working, then this won't work either, since something else is wrong with your session.

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