Nonoka Tori's questions

如何将在方法中创建的对象传递给控制器main()​​？

例子：

public class MainApp extends Application {

    public static void main(String[] args) {

            Some some = new Some(); // это нужно передать в контроллер, но необходимо создавать в Main

            launch(args); // как я понимаю здесь создается объект контроллера
    }
}

class Controller implements Initializable {
      
       Some some; // используется здесь
       @FXML
       Button btn;

       public void clkBtn(ActionEvent actionEvent) {
            some.somethingDoing("хочу что-то передать");
      }
}

我想尝试处理 Pcap4J 库，但我一开始就卡住了。我找到了现成的项目，通过 Maven 加载了所有必要的库。代码仍然没有运行，抛出异常：

Exception in thread "main" java.lang.UnsatisfiedLinkError: Unable to load library 'wpcap':
Не найден указанный модуль.

Не найден указанный модуль.

Не найден указанный модуль.

Can't obtain InputStream for win32-x86-64/wpcap.dll
    at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:302)
    at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:455)
    at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:397)
    at com.sun.jna.Function.getFunction(Function.java:102)
    at org.pcap4j.core.NativeMappings.<clinit>(NativeMappings.java:44)
    at org.pcap4j.core.Pcaps.findAllDevs(Pcaps.java:56)
    at org.pcap4j.util.NifSelector.selectNetworkInterface(NifSelector.java:34)
    at Main.main(Main.java:16)
    Suppressed: java.lang.UnsatisfiedLinkError: Не найден указанный модуль.

        at com.sun.jna.Native.open(Native Method)
        at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:191)
        ... 7 more
    Suppressed: java.lang.UnsatisfiedLinkError: Не найден указанный модуль.

        at com.sun.jna.Native.open(Native Method)
        at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:204)
        ... 7 more
    Suppressed: java.lang.UnsatisfiedLinkError: Не найден указанный модуль.

        at com.sun.jna.Native.open(Native Method)
        at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:265)
        ... 7 more
    Suppressed: java.io.IOException: Can't obtain InputStream for win32-x86-64/wpcap.dll
        at com.sun.jna.Native.extractFromResourcePath(Native.java:1115)
        at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:276)
        ... 7 more

我做错了什么，他为什么抱怨？也许有人使用过这个库并且可以判断。

项目示例：

import com.sun.jna.NativeLibrary;
import org.pcap4j.core.PcapNetworkInterface;
import org.pcap4j.util.NifSelector;

import java.io.IOException;

public class Main {
    public static void main(String[] args)
    {
        // The class that will store the network device
        // we want to use for capturing.
        PcapNetworkInterface device = null;

        // Pcap4j comes with a convenient method for listing
        // and choosing a network interface from the terminal
        try {
            // List the network devices available with a prompt
            device = new NifSelector().selectNetworkInterface();
        } catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println("You chose: " + device);
    }

}

学习使用 JavaFX 制作桌面应用程序。

当我为 button11 添加 onAction 时遇到问题，程序停止运行并开始给出以下类型的错误：

    Exception in Application start method
java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:835)
Caused by: javafx.fxml.LoadException: Root hasn't been set. Use method setRoot() before load.
/C:/Users/Desktop/Diplom_game/out/production/Diplom_game/scene.fxml:16

    at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2621)
    at javafx.fxml/javafx.fxml.FXMLLoader.access$100(FXMLLoader.java:105)
    at javafx.fxml/javafx.fxml.FXMLLoader$RootElement.constructValue(FXMLLoader.java:1338)
    at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:754)
    at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3237)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3194)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3163)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3136)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3113)
    at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3106)
    at Main.start(Main.java:11)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:389)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
    ... 1 more
Exception running application Main

我试图通过在 getResource() 中设置路径来解决问题 - 它没有帮助。这还可能与什么有关？控制器也在 fxml 中注册。

测试应用：

import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class TestApplication extends javafx.application.Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("scene.fxml"));
        primaryStage.setTitle("XO-game");
        primaryStage.setScene(new Scene(root, 165, 250));
        primaryStage.setResizable(false);
        primaryStage.show();

    }

    public static void main(String[] args) {
        launch(args);
    }
}

控制器：

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
import javafx.scene.layout.GridPane;

import java.awt.*;
import java.net.URL;
import java.util.ResourceBundle;

public class Controller implements Initializable {

    @FXML Label going;
    @FXML private Button button11;   


    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {

    }

    @FXML
    private void actionButton11(ActionEvent actionEvent) {
        button11.setName("WOW");
        going.setText("WOWOWOW");
    }
}