Filter拦截跳出FrameSet

1、在项目中我们用Filter拦截判断session是否已失效或已超时，若如此则跳转至登陆页。

如下：

public void doFilter(ServletRequest req, ServletResponse resp,FilterChain chain) throws IOException, ServletException {// TODO 自动生成的方法存根HttpServletRequest request = (HttpServletRequest) req;HttpServletResponse response = (HttpServletResponse) resp;        if(request.getSession().getAttribute("userId")==null||request.getSession(false)==null){        response.getWriter().println("<script>");        response.getWriter().println("self.top.location.href='/CISS/theme/current/loginform.html'");        response.getWriter().println("</script>");        }else{            chain.doFilter(request, response);        }}

并用Filter配置多个拦截路径：

    <filter>         <filter-name>biosFilter</filter-name>         <filter-class>com.fix.ciss.login.BiosFilter</filter-class>    </filter>    <filter-mapping>         <filter-name>biosFilter</filter-name>         <url-pattern>/ReportEmitter</url-pattern>    </filter-mapping>    <filter-mapping>         <filter-name>biosFilter</filter-name>         <url-pattern>/bios/*</url-pattern>    </filter-mapping>