如何利用SpringAOP的返回通知处理数据加密返回

@Aspect
public class ResponseDataEncryptAspect {
    private ObjectMapper objectMapper;
    public ResponseDataEncryptAspect () {
        this.objectMapper = new ObjectMapper();
        // 保持空值也被序列化
        objectMapper.setSerializationInclusion(JsonInclude.Include.ALWAYS);
    }
	// 拦截Controller内带@RequestMapper的方法及衍生注解即可
    @AfterReturning(value = PointCut.CONTROLLER_POINT_CUT, returning = "res")
    public void jsonDateEncrypt(JoinPoint joinPoint, Object res){
        // 只处理JsonResult返回值
        if (res instanceof JsonResult) {
            JsonResult jsonResult = (JsonResult) res;
            Object data = jsonResult.getData();
            if (null != data) {
                // 把data转成json串，再把json串加密，再替换原来的data，vue拦截到data作全局解密，不影响已绑定的功能。
                String json = objectMapper.writeValueAsString(data);
                String cryptResult = ZYCryptUtils.encryptAES(json);
                // 在全局响应结果里添加一个布尔值，方便前端判断到底是密文还是明文
                jsonResult.setEncrypt(true);
                jsonResult.setData(cryptResult);
            }
        }
    }
}