如何制作自定义Java/JavaFX控制台? [英] How to make custom Java/JavaFX console?
问题描述
有必要制作一个自定义控制台.我有以下代码:
It's necessary to make a custom console. I have the following code:
public class Console extends OutputStream{
private Console(ResourceBundle resourceBundle) throws IOException {
FXMLLoader loader = new FXMLLoader(this.getClass().getResource("Console.fxml"), resourceBundle);
controller = loader.getController();
Scene scene = new Scene((Parent) loader.load());
stage = new Stage();
stage.setScene(scene);
show();
}
@Override
public void write(int b) throws IOException {
controller.append(b);
}
public static Console getInstance(ResourceBundle resourceBundle) {
if (console == null) {
try {
console = new Console(resourceBundle);
} catch (IOException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
}
return console;
}
public void show() {
stage.show();
}
private static Console console = null;
private ConsoleController controller;
private Stage stage;
}
控制文件:
public class ConsoleController implements Initializable {
@Override
public void initialize(URL url, ResourceBundle resourceBundle) {
}
@FXML
public void append(int i) {
textArea.appendText(String.valueOf((char) i));
}
@FXML
private TextArea textArea;
}
所有这些都是从"start()"调用的:
And all these are called from the 'start()':
@Override
public void start(Stage primaryStage) throws IOException {
...
System.setErr(new PrintStream(Console.getInstance(rb)));
}
在异常期间，Console.fxml的textArea中不会打印任何内容，但是会引发以下异常:
During the exception nothing is printed in the textArea of the Console.fxml, but the following exception is thrown:
线程"JavaFX Application Thread"中的异常 异常:线程"JavaFX Application Thread"中的UncaughtExceptionHandler引发了java.lang.NullPointerException
Exception in thread "JavaFX Application Thread" Exception: java.lang.NullPointerException thrown from the UncaughtExceptionHandler in thread "JavaFX Application Thread"
我在做什么错了?
------ 编辑 --------
------EDIT--------
了解必须使用多个线程后，我将获得以下代码:
After understanding that it's necessary to use several threads I have the following code:
public class Console{
private Console(ResourceBundle resourceBundle) throws IOException {
FXMLLoader loader = new FXMLLoader(this.getClass().getResource("Console.fxml"), resourceBundle);
Parent root = (Parent) loader.load();
controller = loader.getController();
Scene scene = new Scene(root);
stage = new Stage();
stage.setScene(scene);
show();
if (errorOutputThread != null) {
errorOutputThread.interrupt();
try {
errorOutputThread.join();
} catch (InterruptedException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
errorOutputThread = null;
}
if (outOutputThread != null) {
outOutputThread.interrupt();
try {
outOutputThread.join();
} catch (InterruptedException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
outOutputThread = null;
}
System.err.flush();
System.out.flush();
outPipedInputStream = new PipedInputStream();
outPipedOutputStream = new PipedOutputStream(outPipedInputStream);
System.setOut(new PrintStream(outPipedOutputStream));
errorPipedInputStream = new PipedInputStream();
errorPipedOutputStream = new PipedOutputStream(errorPipedInputStream);
System.setErr(new PrintStream(errorPipedOutputStream));
outOutputThread = new Thread(new ConsoleStream(outPipedInputStream, "OUT"));
outOutputThread.setDaemon(true);
outOutputThread.start();
errorOutputThread = new Thread(new ConsoleStream(errorPipedInputStream, "ERROR"));
errorOutputThread.setDaemon(true);
errorOutputThread.start();
controller.appendText("Start Console");
}
public static Console getInstance(ResourceBundle resourceBundle) {
if (console == null) {
try {
console = new Console(resourceBundle);
} catch (IOException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
}
return console;
}
public void show() {
stage.show();
}
private class ConsoleStream implements Runnable {
private ConsoleStream(InputStream in, String type) {
inputStream = in;
this.type = type;
}
public void run() {
try {
InputStreamReader is = new InputStreamReader(inputStream);
BufferedReader br = new BufferedReader(is);
String read = null;
read = br.readLine();
while(read != null) {
controller.appendText(read + "\n");
read = br.readLine();
}
} catch (IOException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
controller.appendText("Thread" + type + "started");
}
private final InputStream inputStream;
private String type;
}
private static Console console = null;
private ConsoleController controller;
private Stage stage;
private PrintStream printStream;
private PipedOutputStream customPipedOutputStream;
private PipedOutputStream errorPipedOutputStream;
private PipedOutputStream outPipedOutputStream;
private PipedInputStream customPipedInputStream;
private PipedInputStream errorPipedInputStream;
private PipedInputStream outPipedInputStream;
private Thread customOutputThread;
private Thread outOutputThread;
private Thread errorOutputThread;
}
但是结果仅是:启动控制台"，没有controller.appendText("Thread" + type + "started");的结果，因此看来该线程无法启动.但是为什么呢?
But the result is only: "Start Console", there are no results of controller.appendText("Thread" + type + "started"); so it seems that this threads don't start. But why?
推荐答案
我认为您必须先加载表单，然后才能获取控制器实例
I think you have to load the form before you can get the controller instance
FXMLLoader loader = new FXMLLoader(this.getClass().getResource("Console.fxml"),resourceBundle);
Parent p = (Parent) loader.load()
controller = loader.getController();
Scene scene = new Scene(p);
这篇关于如何制作自定义Java/JavaFX控制台?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
