@ResponseEntity返回值(怪異)

定制相應頭

/**
     * 將返回數據放在響應體中
     * 
     * ResponseEntity<String>：響應體中內容的類型
     * @return
     */
    //@ResponseBody
    @RequestMapping("/haha")
    public ResponseEntity<String> hahah(){
        
        MultiValueMap<String, String> headers = new HttpHeaders();
        String body = "<h1>success</h1>";
        headers.add("Set-Cookie", "username=hahahaha");
        
        return new ResponseEntity<String>(body , headers, HttpStatus.OK);
    }