我如何使用javaEE Filter重定向到ajax请求上的另一个url

Question

我正在为我的应用程序创建一个 Web 过滤器，它使用外部身份验证提供程序。如果没有 cookie，或者 cookie 中的令牌无效或过期，则此 Web 过滤器应重定向到登录页面。这对于非 AJAX 请求效果很好，但对于 AJAX 请求，它会向登录表单 URL 发出 AJAX 请求，而不是简单地使用非 AJAX 请求重定向到该 URL。我希望过滤器使用非 AJAX 请求将用户重定向到登录页面，以便用户可以直接输入其凭据。

@WebFilter(urlPatterns = "/*")
public class SecurrityFilter implements Filter {

    @Override
    public void destroy() {
        
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        
        String requestURI = httpRequest.getRequestURI();

        if (requestURI.matches(".*(css|jpg|png|gif|js)")) {
            chain.doFilter(request, response);
            return;
        }
        
        Cookie[] cookies = httpRequest.getCookies();
        boolean cookieExists = false;
        String cookieValue = null;
        if (cookies != null) {
            for (Cookie cookie : cookies) {
                if ("miCookie".equals(cookie.getName())) {
                    cookieExists = true;
                    cookieValue = cookie.getValue();
                    break;
                }
            }
        }
        
        
        if (!cookieExists || !isActiveSession(cookieValue)) {
            if (isAjaxRequest(httpRequest)) {
                //Redirect to http://localhost:8081/login/database using GET method and not using an ajax request 
                return;     
            } else {
                httpResponse.sendRedirect("http://localhost:8081/login/database");
                return;
            }
        }
        
        chain.doFilter(request, response);      
    }

Answer 1

这就是我解决问题的方法

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        
        if (isStaticFileRequest(httpRequest)) {
            chain.doFilter(request, response);
            return;
        }
        
        Optional<String> cookie = getCookie(httpRequest);
        if (cookie.isEmpty() || !isActiveSession(cookie.get())) {
            if (isAjaxRequest(httpRequest)) {
                HttpSession session = ((HttpServletRequest) request).getSession(false);
                session.invalidate();
            } else {
                httpResponse.sendRedirect("http://localhost:8081/login/database");
                return;
            }
        }
        
        chain.doFilter(request, response);      
    }