如何将路径变量分配给 java dsl http 入站网关中的标头? [英] How to assign path variables to headers in a java dsl http inbound gateway?

问题描述

嘿，我不太明白如何转换这个:

Hey i can't quite figure out how to convert this:

<int-http:inbound-gateway request-channel="eventSinkPayloadChannel"
                          path="/EventSink/{producer}/{consumer}"
                          supported-methods="POST" >
    <int-http:header name="PRODUCER" expression="#pathVariables.producer"/>
    <int-http:header name="CONSUMER" expression="#pathVariables.consumer"/>
</int-http:inbound-gateway>

进入Java DSL.我认为 headerExpression 方法将是使用的方法，

into the Java DSL. I thought the headerExpression method would be the one to use,

        Http.inboundGateway("/EventSink/{producer}/{consumer}")
                      .headerExpression("PRODUCER", expression)
                      .headerExpression("CONSUMER", expression)
                      .get()

但是我真的不能在第二个参数中传递一个字符串，因为它需要类型 Expression，所以我不知道我是否必须在那里实例化一个 SpelExpression 或者我是否实际上使用了正确的方法.

but i can't really pass a string in the second argument, coz it's expecting the type Expression, so i dunno if i have to instantiate a SpelExpression there or if i'm even using the right method actually.

感谢您的帮助.

推荐答案

private static final SpelExpressionParser PARSER = new SpelExpressionParser();

...

    .headerExpression("PRODUCER", PARSER.parseExpression("#pathVariables.producer"))

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