HandshakeInterceptor (Spring Framework 5.2.12.RELEASE API)

所有已知实现类:
HttpSessionHandshakeInterceptor, OriginHandshakeInterceptor
```
public interface HandshakeInterceptor
```
Interceptor for WebSocket handshake requests. Can be used to inspect the handshake request and response as well as to pass attributes to the target WebSocketHandler.
从以下版本开始:
4.0
作者:
Rossen Stoyanchev
另请参阅:
WebSocketHttpRequestHandler, DefaultSockJsService

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`void`	`afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception exception)`	Invoked after the handshake is done.
`boolean`	`beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map<String,Object> attributes)`	Invoked before the handshake is processed.

- 方法详细资料
  - beforeHandshake
```
boolean beforeHandshake(ServerHttpRequest request,
                        ServerHttpResponse response,
                        WebSocketHandler wsHandler,
                        Map<String,Object> attributes)
                 throws Exception
```
    Invoked before the handshake is processed.
    参数:
    request - the current request
    response - the current response
    wsHandler - the target WebSocket handler
    attributes - the attributes from the HTTP handshake to associate with the WebSocket session; the provided attributes are copied, the original map is not used.
    返回:
    whether to proceed with the handshake (true) or abort (false)
    抛出:
    Exception
  - afterHandshake
```
void afterHandshake(ServerHttpRequest request,
                    ServerHttpResponse response,
                    WebSocketHandler wsHandler,
                    @Nullable
                    Exception exception)
```
    Invoked after the handshake is done. The response status and headers indicate the results of the handshake, i.e. whether it was successful or not.
    参数:
    request - the current request
    response - the current response
    wsHandler - the target WebSocket handler
    exception - an exception raised during the handshake, or null if none