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如何在JavaFX中使用FXML和任務或服務類中的線程？如何在JavaFX中使用併發（線程）（使用FXML !!!（JavaFX Scene Builder））？
我需要併發程序，因爲我使用了一個非常長的循環。 如果我使用「手動」（無FXML）編碼，那麼它就可以工作。但使用FXML它不起作用（JavaFX Scene Builder）。而不是打印出控制檯中的「字符串緩衝區」變量，我想將它寫入textarea（這是一個可更新的組件）。但是在這種情況下，當然會出現錯誤消息，因爲它不再屬於JavaFX應用程序線程。我如何使這個組件（TextArea textAreaAusgabe）更新/更新，以便我可以在線程中使用它？ 對不起我的英文不好？ 希望你知道我的問題是什麼（它是FXML：-D）。 如果在NetBeans中有另一個gui構建器，我將使用它構建swing的gui構建器。 據我所知道的是場景生成器我想在我的代碼片段使用TASK3爲JavaFX獨一無二的GUI構建:-(。
。 這裏是我的代碼片段不工作（如果我使用如標籤，文本框等）成分：
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.TextArea;
import java.io.*;
import java.util.Random;
import java.util.Arrays;
import javafx.application.Platform;
import javafx.concurrent.Service;
import javafx.concurrent.Task;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.CheckBox;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressBar;
import javafx.scene.control.ProgressIndicator;
import javax.swing.JOptionPane;
import javax.swing.filechooser.FileSystemView;
public class Kontroller implements Initializable
{
int array [ ] = new int [50];
int counter = 0;
String buffer;
int z;
public TextArea textAreaAusgabe;
public Button buttonBerechnen;
public Button buttonReset;
public Label labelAnzahl;
public ProgressBar progressBar;
public ProgressIndicator progressIndikator;
public CheckBox checkBox1;
public CheckBox checkBox2;
public CheckBox checkBox3;
public CheckBox checkBox4;
public CheckBox checkBox5;
public CheckBox checkBox6;
public CheckBox checkBox7;
public CheckBox checkBox8;
public CheckBox checkBox9;
public CheckBox checkBox10;
Task <Integer> task = new Task <Integer> ()
{
@Override
protected Integer call () throws Exception
{
int i;
for (i = 0; i < 100; i++)
{
if (isCancelled ())
{
break;
}
System.out.println("Anzahl " + i);
}
return i;
}
};
Task <Integer> task2 = new Task <Integer> ()
{
@Override
protected Integer call () throws Exception
{
int j;
for (j = 0; j < 1000; j++)
{
if (isCancelled ())
{
updateMessage ("Abgebrochen");
break;
}
System.out.println ("Anzahl " + j);
updateMessage ("Anzahl " + j);
updateProgress (j, 1000);
try
{
Thread.sleep (1);
} catch (InterruptedException interrupted)
{
if (isCancelled ())
{
updateMessage ("Abgebrochen");
break;
}
}
}
return j;
}
};
Service <Void> service = new Service <Void> ()
{
@Override
protected Task <Void> createTask ()
{
return new Task <Void> ()
{
@Override
protected Void call () throws Exception
{
return null;
}
};
}
@Override
protected void succeeded ()
{
}
};
Task task3 = new Task <Void> ()
{
@Override public Void call () throws IOException
{
File ergebnis = new File (FileSystemView.getFileSystemView ().getHomeDirectory ().getAbsolutePath () + "\\Ergebnis.txt");
final FileWriter fw = new FileWriter (ergebnis);
for (int k = 1; k <= 10000000; k++)
{
if (isCancelled ())
{
break;
}
updateProgress (k, 10000000);
Arrays.fill (array, 0);
// textAreaAusgabe.appendText (buffer); // Does not work
System.out.println (buffer); // Works
System.out.println (counter++);
System.out.println ();
fw.append (System.getProperty ("line.separator"));
fw.append (System.getProperty ("line.separator"));
fw.append (""+counter+"");
fw.append (System.getProperty ("line.separator"));
fw.append (System.getProperty ("line.separator"));
}
return null;
}
};
Thread thread = new Thread (task3);
public void reset ()
{
// Zurücksetzen
}
public void berechnen (ActionEvent event)
{
thread.setDaemon (true);
thread.start ();
}
public void fehler ()
{
// Zeige Stage bei Fehler
}
public void initialize (URL url, ResourceBundle rb)
{
progressBar.progressProperty ().bind (task3.progressProperty ());
progressIndikator.progressProperty ().bind (task3.progressProperty ());
}
}
如果我註釋掉行：
// textAreaAusgabe.appendText (buffer); // Does not work
出現以下錯誤：
Exception in thread "Thread-4" java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-4
而且這是在NetBeans輸出完整的錯誤消息：
ant -f D:\\Users\\Benutzer\\Documents\\NetBeansProjects\\Threading jfxsa-run
init:
Deleting: D:\Users\Benutzer\Documents\NetBeansProjects\Threading\build\built-jar.properties
deps-jar:
Updating property file: D:\Users\Benutzer\Documents\NetBeansProjects\Threading\build\built-jar.properties
Compiling 1 source file to D:\Users\Benutzer\Documents\NetBeansProjects\Threading\build\classes
warning: [options] bootstrap class path not set in conjunction with -source 1.5
warning: [options] source value 1.5 is obsolete and will be removed in a future release
warning: [options] target value 1.5 is obsolete and will be removed in a future release
warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
4 warnings
compile:
Detected JavaFX Ant API version 1.3
Launching <fx:jar> task from F:\Java\Java Development Kit\Java Development Kit (1.8.0_20) (x64)\jre\..\lib\ant-javafx.jar
Warning: From JDK7u25 the Codebase manifest attribute should be used to restrict JAR repurposing.
Please set manifest.custom.codebase property to override the current default non-secure value '*'.
Launching <fx:deploy> task from F:\Java\Java Development Kit\Java Development Kit (1.8.0_20) (x64)\jre\..\lib\ant-javafx.jar
jfx-deployment-script:
jfx-deployment:
jar:
Copying 12 files to D:\Users\Benutzer\Documents\NetBeansProjects\Threading\dist\run1389427067
jfx-project-run:
Executing D:\Users\Benutzer\Documents\NetBeansProjects\Threading\dist\run1389427067\Threading.jar using platform F:\Java\Java Development Kit\Java Development Kit (1.8.0_20) (x64)\jre/bin/java
Exception in thread "Thread-4" java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-4
at com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:204)
at com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:364)
at javafx.scene.Scene.addToDirtyList(Scene.java:485)
at javafx.scene.Node.addToSceneDirtyList(Node.java:424)
at javafx.scene.Node.impl_markDirty(Node.java:415)
at javafx.scene.shape.Shape.impl_markDirty(Shape.java:942)
at javafx.scene.Node.impl_geomChanged(Node.java:3784)
at javafx.scene.text.Text.impl_geomChanged(Text.java:763)
at javafx.scene.text.Text.needsTextLayout(Text.java:194)
at javafx.scene.text.Text.needsFullTextLayout(Text.java:189)
at javafx.scene.text.Text.access$200(Text.java:96)
at javafx.scene.text.Text$2.invalidated(Text.java:386)
at javafx.beans.property.StringPropertyBase.markInvalid(StringPropertyBase.java:109)
at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:143)
at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:49)
at javafx.scene.text.Text.setText(Text.java:367)
at com.sun.javafx.scene.control.skin.TextAreaSkin.lambda$new$231(TextAreaSkin.java:571)
at com.sun.javafx.scene.control.skin.TextAreaSkin$$Lambda$256/235779996.invalidated(Unknown Source)
at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:349)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.scene.control.TextInputControl$TextProperty.fireValueChangedEvent(TextInputControl.java:1123)
at javafx.scene.control.TextInputControl$TextProperty.markInvalid(TextInputControl.java:1127)
at javafx.scene.control.TextInputControl$TextProperty.invalidate(TextInputControl.java:1066)
at javafx.scene.control.TextInputControl$TextProperty.access$1300(TextInputControl.java:1038)