<!-- Session监听器 -->    <filter>        <filter-name>sessionValidateFilter</filter-name>        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>    </filter>    <filter-mapping>        <filter-name>sessionValidateFilter</filter-name>        <url-pattern>/admin/*</url-pattern>    </filter-mapping>

    <!-- 配置登录验证拦截器 -->    <bean id="sessionValidateFilter" class="cn.jxufe.core.filter.SessionValidateFilter"></bean>    

public class SessionValidateFilter implements Filter {    public void destroy() {}    public void doFilter(ServletRequest servletRequest,            ServletResponse servletResponse, FilterChain chain)            throws IOException, ServletException {        HttpServletRequest request = (HttpServletRequest) servletRequest;        HttpServletResponse response = (HttpServletResponse) servletResponse;        HttpSession session = request.getSession();        if ((session == null) || (session.getAttribute("username") == null)) {            String PATH=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";            response.sendRedirect(PATH+"login.jsp");        }        chain.doFilter(request, response);    }    public void init(FilterConfig filterConfig) throws ServletException {}}