[HttpSession从角度请求时不返回检索值

Question

嗨，我已经保存了通过HttpSession中的servlet生成的验证码，并将其发送到Angular组件。现在，当用户发回他在那看到的验证码时，我无法将其与HttpSession中的验证码进行比较，因为它为null。

控制器

@PostMapping(value = "/register")
public GenericResponse registerNewUserAccount(@RequestBody UserVO user,
Model model, HttpServletRequest request) throws Exception {
    if (user.getCaptchaResponse() != null ) {
        if (user.getCaptchaResponse().equals(request.getAttribute("captcha"))) {
        ...
        } else {
        ...
        }
}
else {
        ...
} }

将会话视为：

公共类CaptchServlet扩展HttpServlet {

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    String captchaStr = "";
    captchaStr = CaptchUtility.generateCaptchaTextMethod2(6);
    try {
        HttpSession session = request.getSession();
        session.setAttribute("captcha", captchaStr);
        OutputStream outputStream = response.getOutputStream();
        ImageIO.write(cpimg, FILE_TYPE, outputStream);
        outputStream.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    doPost(request, response);
}

}

在控制器session.getAttribute（“ captcha”）为空。

Answer 1

向语音通话添加{withCredentials: true}

this.http.get(someUrl, {withCredentials: true})

这将随请求一起发送cookie，这是造成问题的最可能原因