问题
I am integrating an existing spring MVC web application with spring websockets. I was successfully able to integrate by following the instructions in
https://spring.io/guides/gs/messaging-stomp-websocket/
The existing web application has a filter, which sets a few of the attributes. I have a requirement to access the attributes set by the filter in the controller i,e in @MessageMapping method.
Could some one tel how can we access the request object in the @MessageMapping method?
回答1:
When a STOMP client connects to the application, it first has to request a protocol upgrade to switch to websocket. Once using that websocket connection, the messages sent/received don't go through your regular Servlet filter - only the first HTTP request (the "Handshake") did.
Depending on your use case, there are several ways to achieve this.
If it's related to Authentication, then there are existing features for this in the Spring Framework, but also in Spring Security.
If it's related to the HTTP session, you can easily ask for all HTTP session attributes to be copied into the websocket session - or even customize the Handshake for your own needs (see reference doc). Once done, you can inject the Websocket scope in a @MessageMapping controller method and get those attributes (see reference doc).
来源：https://stackoverflow.com/questions/29215393/how-to-access-request-object-in-messagemapping-method-with-spring-websocket-imp