java – Vertx的路由器问题

早上好,
我从Vertx for java开始,我想创建路由示例,所以我复制过去的行,但似乎在Router.router(顶点)中出现了问题:

  • The type io.vertx.rxjava.core.Vertx cannot be resolved. It is indirectly referenced from
    required .class files

    • The method router(Vertx) from the type Router refers to the missing type Vertx

这是我的代码:

import io.vertx.core.*;
import io.vertx.rxjava.ext.web.*;
import io.vertx.core.http.HttpHeaders;

public class Test extends AbstractVerticle{

@Override
public void start() throws Exception {

    Vertx vertx=Vertx.vertx();
    Router router = Router.router(vertx);

    Route route1 = router.route("localhost:8080/Orsys/").handler(routingContext -> {

          HttpServerResponse response = routingContext.response();
          response.setChunked(true);

          response.write("Orsys\n");

          routingContext.vertx().setTimer(5000, tid -> routingContext.next());
        });

解决方法:

首先,io.vertx.core.AbstractVerticle类中的Vertx实例引用io.vertx.core.Vertx,而不是io.vertx.rxjava.core.Vertx.所以你应该导入io.vertx.ext.web.Router而不是io.vertx.rxjava.ext.web.Router,否则它将不匹配.

其次,Route#route方法不是静态方法,所以首先需要创建一个Router实例:

Router router = Router.router(vertx);

然后调用route方法:

router.route("/Test1").handler(routingContext -> {
            HttpServerResponse response = routingContext.response();
            response.setChunked(true);
            response.write("Test1 \n");

            routingContext.vertx().setTimer(1000, tid ->  routingContext.next());
        });

请注意,route方法不接受绝对URL,因此您无需传递绝对URL.直接传递/ Test1 URL路径,并在createHttpServer时配置主机和端口.

另一个注意事项是,如果要将字节直接写入响应,则应添加response.setChunked(true)或抛出异常:

java.lang.IllegalStateException: You must set the Content-Length header to be the total size of the message body BEFORE sending any data if you are not using HTTP chunked encoding.

或者这更好(总是与结束):

router.route("/Test1").handler(routingContext -> {
            HttpServerResponse response = routingContext.response();
            response.putHeader("content-type", "text/html");
            response.end("<h1>Test1</h1>");
        });

到目前为止,您已经建立了一个简单的路由,因此下一步是创建一个HttpServer:

vertx.createHttpServer()
                .requestHandler(router::accept)
                .listen(8080, "127.0.0.1", res -> {
                    if (res.failed())
                        res.cause().printStackTrace();
                });

好吧,端口和主机可以传递给listen方法.

所以这是更改的正确代码:

import io.vertx.core.AbstractVerticle;
import io.vertx.core.http.HttpServerResponse;
import io.vertx.ext.web.Router;

public class TestVerticle extends AbstractVerticle {

    @Override
    public void start(Future<Void> startFuture) throws Exception {
        Router router = Router.router(vertx);

        router.route("/Test1").handler(routingContext -> {
            HttpServerResponse response = routingContext.response();
            response.setChunked(true);
            response.write("Test1 \n");

            routingContext.vertx().setTimer(1000, tid ->  routingContext.next());
        });

        vertx.createHttpServer()
                .requestHandler(router::accept)
                .listen(8080, "127.0.0.1", res -> {
                    if (res.succeeded())
                        startFuture.complete();
                    else
                        startFuture.fail(res.cause());
                });
    }
}

通过部署Verticle来运行它:

public class Application {

    public static void main(String[] args) {
        Vertx vertx = Vertx.vertx();
        TestVerticle verticle = new TestVerticle();

        vertx.deployVerticle(verticle, res -> {
            if (res.failed())
                res.cause().printStackTrace();
        });
    }
}

所以这只是一个简单的例子.如果您想构建RESTful服务,本文可能会有所帮助:Some Rest with Vert.x

这是我使用Vert.x Web的RESTful服务的示例,它也可能有所帮助:https://github.com/sczyh30/todo-backend-vert.x

我希望这些可以帮到你:)

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