java - 我缺少类似 : 'isConnected' on ClientDolphin class (open-dolphin) 的内容

Question

如果我按照 java 类运行，没有异常或错误消息发生，但我确定无法建立连接(GrailsApplication1 未运行，并且“url”未指向任何 bean):

public class ConnectNow {

private void connect() {
    ClientDolphin dClient = new ClientDolphin();

    dClient.setClientModelStore(new ClientModelStore(dClient));
    String url = "http://localhost:8080/GrailsApplication1/";
    ClientConnector connector = new HttpClientConnector(dClient, url);
    connector.setCodec(new JsonCodec());
    dClient.setClientConnector(connector);
    dClient.send("Hi from client");
}

public static void main(String[] args) {
    ConnectNow cn = new ConnectNow();
    cn.connect();
    System.out.println("End");
}

Soo，我如何识别连接是否建立？我是客户端/服务器开发的新手，所以我可能遗漏了一些明显的东西。

感谢您的任何建议或文档引用!

Answer 1

现在，我想通了...关键是我必须将代码作为应用程序运行，在本例中为 javafx 应用程序。然后，如果您尝试传输某些内容(dClient 发送“嗨... - 在这种情况下)，应用程序会尝试发送一条消息，并且您会收到 ConnectException: Connection refused，如果没有任何内容正在运行网址。

在我看来，这是 open-dolphin 服务器可访问性测试的最短版本:

import javafx.application.Application;
import javafx.stage.Stage;
import org.opendolphin.core.client.ClientDolphin;
import org.opendolphin.core.client.ClientModelStore;
import org.opendolphin.core.client.comm.ClientConnector;
import org.opendolphin.core.client.comm.HttpClientConnector;
import org.opendolphin.core.comm.JsonCodec;

/**
 *
 * @author Václav Hanton
 */
public class ConnectNow extends Application {

    private void connect() {
        ClientDolphin dClient = new ClientDolphin();

        ClientModelStore mStore = new ClientModelStore(dClient);
        dClient.setClientModelStore(mStore);
        String url = "http://localhost:8080/GrailsApplication1/";
        ClientConnector connector = new HttpClientConnector(dClient, url);
        connector.setCodec(new JsonCodec());

        dClient.setClientConnector(connector);
        dClient.send("Hi from client");
    }

    public static void main(String[] args) {
        ConnectNow cn = new ConnectNow();
        cn.connect();
        Application.launch();
    }

    @Override
    public void start(Stage stage) throws Exception {
        System.out.println("Started");
    }
}