J2EE 过滤器:登录页面无法加载 CSS 或任何图像

Question

我已经访问了Java FilterImplementation的会话检查链接，其中说明了Spring的安全性。我没有得到我需要的帮助。

应用过滤器登录后.jsp无法加载 CSS 和图像。

我正在尝试在 web 中提供过滤器的简单示例.xml并在 login.jsp 以外的页面上应用过滤器。网站.xml文件是：

<filter>
    <filter-name>struts2</filter-name>
    <filter-class>
         org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
    </filter-class>
</filter>
<filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
 <filter>
 <filter-name>AuthenticationFilter2</filter-name>
 <filter-class>filter.AuthorizationFilter2</filter-class>
 <init-param>
    <param-name>avoid-urls</param-name>
    <param-value>login.jsp</param-value>
 </init-param>`
 <filter>

过滤器类是：

    private ArrayList<String> urlList;
public void destroy() {
    // TODO Auto-generated method stub
    System.out.println("authorization filter2 destroy method....");
}


public void doFilter(ServletRequest req, ServletResponse res,
        FilterChain chain) throws IOException, ServletException {
    System.out.println("authorization filter2 doFilter method....");
    HttpServletRequest request = (HttpServletRequest) req;
    HttpServletResponse response = (HttpServletResponse) res;
    String url = request.getServletPath();
    System.out.println("ppp:"+request.getRequestURL());
    System.out.println("url is :"+url);
    boolean allowedRequest = false;
    System.out.println("url list is :"+urlList);
    if(urlList.contains(url.substring(1))) {
        allowedRequest = true;
    }
    System.out.println("request allowed....."+allowedRequest);     
    if (!allowedRequest) {
        Map session = ActionContext.getContext().getSession();
        /*HttpSession session = request.getSession(false);*/
       /* if (null == session) {
            response.sendRedirect("login.jsp");
        }*/
        System.out.println("session contains login :"+session.containsKey("login"));

        if(!session.containsKey("login")){
            response.sendRedirect("login.jsp");
        }
    }
    chain.doFilter(req, res);
}
public void init(FilterConfig config) throws ServletException {
    System.out.println("authorization filter2 init method....");
    String urls = config.getInitParameter("avoid-urls");
    StringTokenizer token = new StringTokenizer(urls, ",");
    urlList = new ArrayList<String>();
    while (token.hasMoreTokens()) {
        urlList.add(token.nextToken());
    }
}

登录页面包含css和images根据要求。

请帮帮我。谢谢。

Answer 1

@Override
public void doFilter(ServletRequest request, ServletResponse response,
        FilterChain chain) throws IOException, ServletException {

    String uri = ((HttpServletRequest)request).getRequestURI();
    @SuppressWarnings("rawtypes")
    Map session = ActionContext.getContext().getSession();
    if ( uri.indexOf("/css") > 0){
        chain.doFilter(request, response);
    }
    else if( uri.indexOf("/images") > 0){
        chain.doFilter(request, response);
    }
    else if( uri.indexOf("/js") > 0){
        chain.doFilter(request, response);
    }
    else if (session.containsKey("login")) {
        chain.doFilter(request, response);
    }
    else {
        ((HttpServletResponse)response).sendRedirect(((HttpServletRequest)request).getContextPath() + "/login?authentication=failed");
    }
}

把这个代码块放在你的动作类中，它可以工作。谢谢大家。

Answer 2

必须在 logjn.jsp 页面上使用的 CSS 文件和图像必须从过滤器中排除