登录失败后,我想将用户重定向到错误页面并显示有意义的错误消息.是否可以添加将传递给后续请求的Flash属性？

下面显示的代码不起作用. RequestContextUtils.getOutputFlashMap()返回null.

public class CustomAuthenticationFailureHandler implements AuthenticationFailureHandler
{
    @Override
    public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response, AuthenticationException exception) throws IOException, ServletException
    {
        FlashMap outputFlashMap = RequestContextUtils.getOutputFlashMap(request);
        if (outputFlashMap != null)
        {
            outputFlashMap.put("error", "Error message");
        }
        response.sendRedirect(request.getContextPath() + "/error");
    }
}

解决方法:

我猜这是空的,因为您是从过滤器链中调用该函数的,而flash映射是由Spring的DispatcherServlet维护的,该请求此时尚未通过.

为什么不只使用参数？即

 response.sendRedirect(request.getContextPath()+"/error?error=" + "Error Message");