springboot 字符串返回json格式

    /**
     * 根据token获取用户信息
     */
    @GetMapping("/singleLogin/getAccount")
    public void request(@RequestParam("token") String token, HttpServletResponse response) throws IOException {

        token = "TOKEN-"+token;
        redisTemplate.setValueSerializer(new StringRedisSerializer());
        String str = redisTemplate.opsForValue().get(token).toString();

        response.setContentType("application/json;charset=utf-8");

        response.getWriter().write(str);

    }