如何在Spring Webflux中获得运行时的服务器端口？

import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.server.ServerWebExchange;

@RestController
public class ExampleController {

    @GetMapping("/getServerPort")
    public String getServerPort(ServerWebExchange exchange) {
        ServerHttpRequest request = exchange.getRequest();
        int port = request.getURI().getPort();
        return "Server Port: " + port;
    }
}