Java MVC Controller 中通过不同方式获取 @PathVariable 参数值

1     @RequestMapping(value = "/test/{a}")
2     public @ResponseBody Object test(@PathVariable String a) {
3
4         return a;
5     }

1     @RequestMapping(value = "/test/{a}")
2     public @ResponseBody Object test(@PathVariable String a, HttpServletRequest httpServletRequest) {
3
4         NativeWebRequest webRequest = new ServletWebRequest(httpServletRequest);
5         Map<String, Object> pathVars = (Map<String, Object>) webRequest.getAttribute(View.PATH_VARIABLES, RequestAttributes.SCOPE_REQUEST);
6
7         return pathVars;
8     }

1     @RequestMapping(value = "/test/{a}")
2     public @ResponseBody Object test(HttpServletRequest httpServletRequest) {
3         NativeWebRequest webRequest = new ServletWebRequest(httpServletRequest);
4         Map<String, String> uriTemplateVars = (Map<String, String>) webRequest.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE, RequestAttributes.SCOPE_REQUEST);
6         return uriTemplateVars;
7     }