java的response对象添加Cookie报错：An invalid character [34] was present in the Cookie value

在jsp页面中，我的java代码如下：

    String json = "{\"username\":\"prince\",\"password\":\"123456\"}";
    Cookie cookie = new Cookie("user", json);
    response.addCookie(cookie);

服务器报错：

解决：使用URLEncoder进行转化：

    String json = "{\"username\":\"prince\",\"password\":\"123456\"}";
    Cookie cookie = new Cookie("user", URLEncoder.encode(json, StandardCharsets.UTF_8));
    response.addCookie(cookie);