Spring 3 HandlerInterceptor将信息传递给控制器​​

Question

我已经设置了一个Spring HandlerInterceptor来向HttpServletRequest添加一个属性，以便能够从Controller读取它，可悲的是，这看起来并不起作用，这对我来说似乎很奇怪。我做错了什么？任何想法如何将数据从拦截器传输到控制器？

下面是两个影响类

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的简化代码...但如果我在读的postHandle它返回的值除外的HandlerInterceptor，我觉得我失去了一些东西...

编辑：我发现通过会议与“request.getSession（）。setAttribute”作为一种魅力，仍然我不明白为什么请求本身在这个用例中不起作用。

Answer 1

你可以尝试会议而不是像下面的请求。

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"); 
      .... 


    }