Spring MVC的Cookie问题

Question

我试图使用cookie值@Cookie.但是如果cookie值为null,我会得到400错误.怎么了？这是我的控制器:

    public String listContacts(Map<String, Object> map,
            HttpServletResponse response, @CookieValue("flag") String flag) {



        response.addCookie(new Cookie("flag", "In use"));
...

Answer 1

尝试required = false在@CookieValue注释中设置:

public String listContacts(Map<String, Object> map,
      HttpServletResponse response, @CookieValue(value = "flag", required = false) String flag) {

默认情况下,spring期望cookie标头存在并抛出异常,否则:

默认值为true,导致在请求中缺少标头时抛出异常.如果您在缺少标题时更喜欢null,请将其切换为false.

或者,提供defaultValue,隐式将此标志设置为false.