@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);
 
"message", "Hello World!");
       
return "hello";
    }

如果加了 @ResponseBody  则在当前请求页面返回内容.