Servlet: Cannot forward after response has been committed(Servlet:提交响应后无法转发)
问题描述
我正在开发基于 geo-location
呈现内容的 servlet 页面,我想同时使用 sendRedirect
和 forward
;例如;您从 France
浏览 example.com/aPage.jsp
;首先,我希望 servlet 将您重定向到 example.com/fr/aPage.jsp
,然后将您转发到 resources
页面.
I'm working on servlet page that renders content based on geo-location
, and I want to use both sendRedirect
and forward
together; e.g; you browse example.com/aPage.jsp
from France
; first I want the servlet to redirect you to example.com/fr/aPage.jsp
and then forward you to the resources
page.
这就是我的 servlet 中的内容:
This is what I have in my servlet:
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
....
response.sendRedirect(REDIRECT_URL_BASED_ON_GEO);
// after redirect forward the resources page
RequestDispatcher view = request.getRequestDispatcher(RESOURCES_PAGE);
view.forward(request, response);
...
}
但我明白了:
java.lang.IllegalStateException: Cannot forward after response has been committed
我知道错误出现是因为我不能同时使用 sendRedirect
和 forward
一个又一个,但我不知道如何在没有这个的情况下实现我想要的(如上所述).
I know the error appears because I can't use both sendRedirect
and forward
one after another, but I don't know how to achieve what I want (as described above) without this.
有什么帮助吗?
推荐答案
response.sendRedirect(REDIRECT_URL_BASED_ON_GEO);
// after redirect forward the resources page
在那一行之后,您的回复开始写入 clinet.
After that line , Your response start writing to clinet.
您正在尝试向其中添加其他数据.
And you are trying to add additional data to it.
服务器已经完成响应头的写入,并且正在写入内容的正文,以及您尝试在标题中写入更多内容的点 - 当然它不能倒带.
The server has already finished writing the response header and is writing the body of the content, and which point you are trying to write more to the header - of course it cant rewind.
所以,处理 servlet 时的拇指规则是
So,Thumb rule while dealing with servlet is
在redirect
或forward
添加return语句之前完成你的逻辑.所以执行到此结束.
Finish your logic before redirect
or forward
add return statement.So execution ends there .
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本文标题为:Servlet:提交响应后无法转发
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