zoukankan      html  css  js  c++  java
  • 异常信息:java.lang.IllegalStateException: Cannot forward after response has been committed

    1.给后台加了登录过滤器

    2. 登录后出现异常:

    java.lang.IllegalStateException: Cannot forward after response has been committed

             at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:328)

             at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318)

             at com.zuikc.bookstore.admin.web.filter.AdminFilter.doFilter(AdminFilter.java:32)

             at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)

             at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)

             at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)

             at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)

             at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)

             at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141

    这个异常意味response已经被提交,不能再跳转了。这个错误的出现是因为response多次提交或在跳转到页面后仍有跳转请求。

    3.好像过滤器有问题:

    异常信息中有这么一句: at com.zuikc.bookstore.admin.web.filter.AdminFilter.doFilter(AdminFilter.java:32)

    4.过滤器代码如下:

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

                       /*

                        * 从session中获取admin

                        * 如果admin!=null,放行

                        * 如果为null,保存异常信息到request域,转发到login.jsp

                        */

                                HttpServletRequest httpRequest = (HttpServletRequest) request;

                                Admin admin = (Admin) httpRequest.getSession().getAttribute("session_admin");

                                if(admin != null)chain.doFilter(request, response);                          

                                request.setAttribute("msg", "未登录用户不能访问访问此页面,请先登录");

                                httpRequest.getRequestDispatcher("/adminjsps/login.jsp").forward(httpRequest, response);                                               

             }

    5.解决方法:

    if判断这里出了问题,上面的代码导致放行后后面的代码还是执行了,即又放行又转发。所有才会提示:Cannot forward after response has been committed

    修改代码如下:

    或者:

  • 相关阅读:
    Spring整合MyBatis(一)MyBatis独立使用
    Spring AOP源码分析(三)创建AOP代理
    Spring AOP源码分析(二)动态A0P自定义标签
    Spring AOP源码分析(一)使用示例
    JDK(十)JDK1.7&1.8源码对比分析【集合】ConcurrentHashMap
    JDK(九)JDK1.7源码分析【集合】HashMap的死循环
    JDK(八)JDK1.7&1.8源码对比分析【集合】HashMap
    MySQL(五)SELECT语句执行顺序
    版本控制器:SVN
    springmvc
  • 原文地址:https://www.cnblogs.com/rachelgarden/p/10620268.html
Copyright © 2011-2022 走看看