spring mvc相关

@ResponseBody 直接返回相应内容

 @RequestMapping(value="test/{sessionId}",method = RequestMethod.GET)

    public String test(@PathVariable("sessionId") String sessionId,Model model, HttpServletResponse response, HttpServletRequest request) {

       logger.info("test:"+sessionId);

       model.addAttribute("message", "Hello World!");

         return "hello";

    }

如果加了 @ResponseBody  则在当前请求页面返回内容.