java - 从命令行应用程序访问javafx剪贴板？

Question

这可能是新手提出的一个愚蠢问题，所以请耐心等待。这是我所做的:

import javafx.scene.input.Clipboard;
import javafx.scene.input.ClipboardContent;

import javax.sound.sampled.Clip;

public class Main {
    public static void main(String[] args) {
        final Clipboard clipboard = Clipboard.getSystemClipboard();
        final ClipboardContent content = new ClipboardContent();
        content.putHtml("<b>Some bold html</b>");
        clipboard.setContent(content);
    }
}

我收到以下错误:

/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/bin/java -Didea.launcher.port=7532 "-Didea.launcher.bin.path=/Applications/IntelliJ IDEA 13 CE.app/bin" -Dfile.encoding=UTF-8 -classpath "/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/lib/tools.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/htmlconverter.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Users/kaiyin/IdeaProjects/untitled8/out/production/untitled8:/Applications/IntelliJ IDEA 13 CE.app/lib/idea_rt.jar" com.intellij.rt.execution.application.AppMain com.company.Main
Picked up _JAVA_OPTIONS: -Dawt.useSystemAAFontSettings=lcd                       -Dsun.java2d.xrender=true
Exception in thread "main" java.lang.IllegalStateException: This operation is permitted on the event thread only; currentThread = main
    at com.sun.glass.ui.Application.checkEventThread(Application.java:432)
    at com.sun.glass.ui.ClipboardAssistance.<init>(ClipboardAssistance.java:40)
    at com.sun.javafx.tk.quantum.QuantumToolkit.getSystemClipboard(QuantumToolkit.java:1127)
    at javafx.scene.input.Clipboard.getSystemClipboardImpl(Clipboard.java:410)
    at javafx.scene.input.Clipboard.getSystemClipboard(Clipboard.java:175)
    at com.company.Main.main(Main.java:10)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)

Process finished with exit code 1

是否可以在不创建 GUI 的情况下访问 javafx cliboard？

Answer 1

我会忽略你为什么要这样做的问题......

正如评论中所指出的，您需要启动 FX 应用程序线程才能访问 JavaFX 剪贴板。但是，您实际上不需要在任何时候显示Stage。

以下内容编译并运行:

import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.input.Clipboard;
import javafx.scene.input.ClipboardContent;
import javafx.stage.Stage;

public class ClipboardTest extends Application {

    @Override
    public void start(Stage primaryStage) {
        final Clipboard clipboard = Clipboard.getSystemClipboard();
        final ClipboardContent content = new ClipboardContent();
        content.putHtml("<b>Some bold html</b>");
        clipboard.setContent(content);

        Platform.exit();
    }

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