Spring 3 HandlerInterceptor將信息傳遞給控制器​​

Question

我已經設置了一個Spring HandlerInterceptor來向HttpServletRequest添加一個屬性，以便能夠從Controller讀取它，可悲的是，這看起來並不起作用，這對我來說似乎很奇怪。我做錯了什麼？任何想法如何將數據從攔截器傳輸到控制器？

下面是兩個影響類

public class RequestInterceptor implements HandlerInterceptor { 
    @Override 
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) { 
     request.setAttribute("my-role", "superman"); 
    } 
    [...] 
} 

@RestController 
@RequestMapping("Test") 
public class TestController { 
    public final Logger logger = LoggerFactory.getLogger(getClass()); 

    @RequestMapping(value = "something") 
    public void something(HttpServletRequest request) { 
     logger.info(request.getAttribute("my-role")); 
    } 

    [...] 
} 

的request.getAttribute（「我的角色」）返回null的簡化代碼...但如果我在讀的postHandle它返回的值除外的HandlerInterceptor，我覺得我失去了一些東西...

編輯：我發現通過會議與「request.getSession（）。setAttribute」作爲一種魅力，仍然我不明白爲什麼請求本身在這個用例中不起作用。

Answer 1

你可以嘗試會議而不是像下面的請求。

public boolean preHandle(HttpServletRequest request, 
       HttpServletResponse response, Object handler) throws Exception { 
       ... 
       HttpSession session = request.getSession(); 
       session.setAttribute("attributeName", objectYouWantToPassToHandler); 
       .... 
       } 
    In your handler handleRequest method: 

     public ModelAndView handleRequest(HttpServletRequest request, 
      HttpServletResponse response) throws Exception {     

      .... 
      HttpSession session = request.getSession(); 
      objectYouWantToPassToHandler objectYouWantToPassToHandler = session.getAttribute("attributeName"); 
      .... 


    }