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有必要制作一个自定义控制台。我有以下代码:如何制作自定义的Java/JavaFX控制台?
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;
}
控制器文件:
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;
}
而所有这些都是从被称为 '开始()':
@Override
public void start(Stage primaryStage) throws IOException {
...
System.setErr(new PrintStream(Console.getInstance(rb)));
}
在异常没有被印在Console.fxml
的textArea
,但引发以下异常:
异常在线程“的JavaFX应用程序线程” 例外:显示java.lang.NullPointerException在线程“的JavaFX应用程序线程”
什么我做错了从UncaughtExceptionHandler的抛出?
------ 编辑 --------
理解,它是需要使用多个线程后,我有以下代码:
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;
}
但结果只是:“启动控制台”,没有结果controller.appendText("Thread" + type + "started");
,所以看起来这个线程没有启动。但为什么?
东西是空(我不知道是什么)。 [Java 8](http://jdk8.java.net/download.html)允许你[为JavaFX应用程序线程设置未捕获的异常处理程序](https://javafx-jira.kenai.com/browse/RT -15332)。也许如果你在Java 8中测试你的应用程序并设置了一个未捕获的异常处理程序,你将能够获得更多的信息(如堆栈跟踪),这可能会帮助你调试你的问题。 – jewelsea
您可能也对[系统错误和系统输出控制台记录器](https://github.com/jewelsea/conception/blob/master/src/org/jewelsea/conception/LogArea.java)感兴趣,我为JavaFX迷你IDE项目。这可能不是处理这种问题的最有效的方式,但它对我有效。 – jewelsea
@jewelsea:我使用了你的记录器代码,并且明白我需要单独的控制台线程。现在我有另一个问题 - 这些线程不想开始。 – Eugene