Building a HTTP Endpoint with Eclipse Vert.x

cescoffier

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01 Introduction

02 Vert.x

03 Creating a HTTP server

04 Producing JSON

05 Getting query parameters

06 Observing the event loop

07 Summary

Previous: Producing JSON Next: Observing the event loop

Retrieving parameters

Let's now extend our code to retrieve a parameter passed in the url (query). You can retrieve query parameters using the getParam method:

Retrieving query parameters

package io.vertx.playground;
import io.vertx.core.Vertx;
import io.vertx.core.json.JsonObject;
public class HttpServerQueryExample {
    public static void main(String... args) {
       Vertx vertx = Vertx.vertx(); 
       vertx.createHttpServer()
        .requestHandler(req -> {
            String name = req.getParam("name");
            String message = "hello " + (name != null && ! name.trim().isEmpty() ? name : "world") + "!";
            JsonObject json = new JsonObject()
                .put("message", message);
           req.response()
                .putHeader("Content-Type", "application/json; charset=UTF8")
                .end(json.encodePrettily());
        })
        .listen(8080);
    }
}

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