Cannot create a session after the response has been committed

有时候在操作Session时，系统会抛出如下异常

java.lang.IllegalStateException: Cannot create a session after the response has been committed

之所以会出现此类问题是因为我们在Response输出响应后才创建Session的。

(因为那时候服务器已经将数据发送到客户端了，即：就无法发送Session ID 了)

解决办法：

你只需要在你的程序中将创建访问Session的语句【request.getSession()】提前至Response输出数据之前就好了。

例如改成下面的写法OK：

ServletOutputStream out = response.getOutputStream();
// 最好这样紧挨着 response.getOutputStream()
HttpSession seesion = request.getSession();
seesion.setAttribute("xxx", rand);

// 输出数据
out.print("<h1>hello</h1>");
out.close();

http://hi.baidu.com/matrix286/item/63085d33459a0027b3c0c565

转载于:https://blog.51cto.com/fzqmcn/1270679

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