ifram框架session过期时，导致框架内部嵌套显示顶层框架的解决

package com.aowin.filter;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.aowin.model.User;public class LogFilter implements Filter{@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)throws IOException, ServletException{HttpServletRequest req=(HttpServletRequest)request;HttpServletResponse resp=(HttpServletResponse)response;User user=(User) req.getSession().getAttribute("user");String uri=req.getRequestURI();String path=req.getContextPath();if(user==null&&!uri.endsWith("login.jsp")){//resp.sendRedirect(path+"/login.jsp");resp.setContentType("text/html;charset=UTF-8");        resp.getWriter().println("<script type=\"text/javascript\">"        + "if(window.opener==null){window.top.location.href=\""+path+"/login.jsp\";}"        + "else{window.opener.top.location.href=\""+path+"/login.jsp\";window.close();}</script>");}elsechain.doFilter(request, response);}@Overridepublic void init(FilterConfig filterConfig) throws ServletException{}@Overridepublic void destroy(){}}