如何从RoutingContext获取消息体？

import io.vertx.core.Handler;
import io.vertx.core.Vertx;
import io.vertx.core.http.HttpServerRequest;
import io.vertx.ext.web.Route;
import io.vertx.ext.web.Router;
import io.vertx.ext.web.RoutingContext;

public class ExampleServer {
    public static void main(String[] args) {
        Vertx vertx = Vertx.vertx();
        Router router = Router.router(vertx);

        Route route = router.get("/example");
        route.handler(new ExampleHandler());

        vertx.createHttpServer()
                .requestHandler(router)
                .listen(8080);
    }
}

class ExampleHandler implements Handler<RoutingContext> {
    @Override
    public void handle(RoutingContext routingContext) {
        HttpServerRequest request = routingContext.request();
        String body = routingContext.getBodyAsString();

        // 处理获取到的消息体
        System.out.println("Received body: " + body);

        routingContext.response().end("Request processed");
    }
}