如何在Spring集成java dsl中创建一个头值路由器并为其分配一个默认的输出通道？

I have it like this currently:

我现在这样：

.route("headers.STATE", new Consumer<RouterSpec<ExpressionEvaluatingRouter>>() {
        @Override
        public void accept(RouterSpec<ExpressionEvaluatingRouter> spec) {
            spec
                .channelMapping(ProcStatus.NORMAL_OPERATION.toString(), "primaryChannel")
                .channelMapping(ProcStatus.FAILED_OVER.toString(), "secondaryChannel")
                .channelMapping(ProcStatus.UNKNOWN.toString(), "stateRetrievalChannel");
                }
            })
.rout