javax.servlet.Filter 会拦截 Websocket 消息吗?(Java Servlet API) [英] Will javax.servlet.Filter intercept Websocket messages? (Java Servlet API)

问题描述

当我有一个 websocket 连接时，在 "/ws" 说

When I have a websocket connection, say at "/ws"

/ws"路径上的常规 javax.servlet.Filter 是否会将每条消息作为常规 http 请求拦截?它会只拦截第一个请求(作为握手的一部分?)

Will a regular javax.servlet.Filter on the "/ws" path intercept each message as a regular http request? Will it intercept only the first request (as part of the handshake?)

如果没有，那么我如何为 websocket 消息制作这样的过滤器?

If no, then, how can I make such a filter for websocket messages?

我在规范中没有找到任何关于它的细节.

I don't find any specifics about that in the spec.

推荐答案

不，Servlet 过滤器不会捕获 WebSocket 消息.

No, Servlet Filter won't catch WebSocket messages.

Servlet 根本不支持 WebSocket 协议.你唯一能做的就是注册 HttpUpgradeHandler(参见 HttpServletRequest#升级)，然后在此基础上实现 WebSocket 协议.

Servlet does not support WebSocket protocol at all. Only thing you can do is to register HttpUpgradeHandler (see HttpServletRequest#upgrade)and then implement WebSocket protocol on top of that.

或者...如果您想节省一些时间，请查看 JSR 356 和实现，它们正在此 API 之上工作.我个人在 Tyrus 上工作，它是 JSR 356 的参考实现.(它是 Java EE 7 的一部分，但是您只需要 Servlet 3.1 API).

Or.. if you want to save some time, take a look at JSR 356 and the implementations, they are working on top of this API. I personally work on Tyrus, which is the reference implementation of JSR 356. (It is part of Java EE 7, but you only need Servlet 3.1 API).

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