java 如何将请求从 web1/servlet 转发到 web2/servlet？
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How to forward request from web1/servlet to web2/servlet?
提问by wasimbhalli
I've two web applications say web1 and web2. I want to forward a request from web1/servlet1 to web2/servlet2. Is it possible? Please help!
我有两个 Web 应用程序，分别是 web1 和 web2。我想将请求从 web1/servlet1 转发到 web2/servlet2。是否可以？请帮忙！
回答by skaffman
This is a two-step process:
这是一个两步过程：
- Get hold of the
ServletContextrepresentingweb2 - Get the
RequestDispatcherfrom thatServletContextcorresponding toservlet2
- 抓住
ServletContext代表web2 - 获得
RequestDispatcher从ServletContext对应servlet2
So, something like this, from inside servlet1:
所以，像这样，从内部servlet1：
ServletContext web1 = getServletContext();
ServletContext web2 = web1.getContext("/web2");
RequestDispatcher dispatcher = web2.getRequestDispatcher("/servlet2");
dispatcher.forward(request, response);
There's a big caveat to all of this - the container may not be configured to permit cross-context forwarding, since it's a potential security risk. If this is the case, getContext("web2")will return null.
所有这些都有一个很大的警告 - 容器可能未配置为允许跨上下文转发，因为它存在潜在的安全风险。如果是这种情况，getContext("web2")将返回null。
