Servlet Filter 过滤器 对指定页面不拦截

不多说，直接上代码：

java————————》Filter

package niit.dxs.controller;import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.io.IOException;public class LoginFilter implements Filter {    private String excludedPage;    private String[] excludedPages;    @Override    public void init(FilterConfig filterConfig) throws ServletException {        excludedPage = filterConfig.getInitParameter("excludedPages");        if (excludedPage != null && excludedPage.length() > 0){            excludedPages = excludedPage.split(",");        }    }    @Override    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {        // 获取 resquest、response、session        HttpServletRequest request = (HttpServletRequest) servletRequest;        HttpServletResponse response = (HttpServletResponse) servletResponse;        HttpSession session = request.getSession();        // 定义表示变量 并验证用户请求URL 是否包含不过滤路径        boolean flag = false;        for (String page:excludedPages) {            if (request.getServletPath().equals(page)){                flag = true;            }        }        // 验证用户登录        if (flag){            filterChain.doFilter(request,response);        }{            String userName= (String) session.getAttribute("userKey");            System.out.println("userid——————————》"+userName);            if (userName != null){                filterChain.doFilter(request,response);            }else {                request.getRequestDispatcher("index.jsp").forward(request,response);            }        }    }    @Override    public void destroy() {    }}

web.xml

<!--  过滤器   --><filter>    <filter-name>LoginFilter</filter-name>    <filter-class>niit.dxs.controller.LoginFilter</filter-class>    <init-param>        <param-name>excludedPages</param-name>        <param-value>/index.jsp,/register.html,/RegisterServlet,/LoginServlet</param-value>    </init-param></filter><filter-mapping>    <filter-name>LoginFilter</filter-name>    <url-pattern>/*</url-pattern></filter-mapping>

谢谢各位参考！