我正在学习 JavaFX 并尝试它。我尝试构建一个控制台/命令提示符。但我不知道如何将输入/输出/错误从 ProcessBuilder 重定向到 TextArea。
代码:
public class JavaFXConsole extends Application {
ProcessBuilder pb;
Process process;
TextArea ta;
String input = "";
int counter = 0;
//static BufferedReader stdInput, stdError;
//static Thread outputThread;
@Override
public void start(Stage primaryStage) {
ta = new TextArea("$");
ta.setOnKeyTyped(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent event) {
{
input = input.concat(event.getCharacter());
System.out.println(input);
}
}
});
final KeyCombination keyComb1 = new KeyCodeCombination(KeyCode.C,
KeyCombination.CONTROL_DOWN);
ta.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent event) {
if (event.getCode() == KeyCode.ENTER) {
getOutPut(input);
input = "";
System.out.println("Command Sent");
} else if (keyComb1.match(event)) {
System.out.println("Control+C pressed");
}
}
});
HBox root = new HBox();
root.getChildren().add(ta);
pb = new ProcessBuilder("bash");
try {
process = pb.start();
} catch (IOException ex) {
Logger.getLogger(JavaFXConsole.class.getName()).log(Level.SEVERE, null, ex);
}
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
public void getOutPut(String command) {
Thread outputThread = new Thread(new Runnable() {
@Override
public void run() {
try {
BufferedReader stdInput, stdError;
stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));
stdError = new BufferedReader(new InputStreamReader(process.getErrorStream()));
OutputStream out;
out = process.getOutputStream();
out.write(command.getBytes());
//out.flush();
out.close();
// read the output from the command
System.out.println("Here is the standard output of the command:\n");
String s = null;
String output = "";
int ocounter = 0;
while ((s = stdInput.readLine()) != null) {
ocounter++;
System.out.println(s);
String str = s;
Platform.runLater(new Runnable() {
@Override
public void run() {
ta.appendText(">"+str + "\n");
}
});
}
output = "";
ocounter = 0;
// read any errors from the attempted command
System.out.println("Here is the standard error of the command (if any):\n");
while ((s = stdError.readLine()) != null) {
ocounter++;
System.out.println(s);
String str = s;
Platform.runLater(new Runnable() {
@Override
public void run() {
ta.appendText("*"+str + "\n");
}
});
}
Platform.runLater(new Runnable() {
@Override
public void run() {
ta.appendText("$");
}
});
// stdError.close();
// stdInput.close();
} catch (IOException ex) {
Logger.getLogger(JavaFXConsole.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
outputThread.start();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
任何建议都会有帮助。 :)
编辑:1
确实改进了一点，但现在出现异常，只能执行一个命令
如果我没有在out.close();中关闭流。命令将不会执行。
Jan 22, 2015 10:54:57 PM javafxconsole.JavaFXConsole$2 handle
SEVERE: null
java.io.IOException: Stream closed
at java.lang.ProcessBuilder$NullOutputStream.write(ProcessBuilder.java:433)
at java.io.OutputStream.write(OutputStream.java:116)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
at java.io.FilterOutputStream.close(FilterOutputStream.java:158)
at javafxconsole.JavaFXConsole$2.handle(JavaFXConsole.java:69)
at javafxconsole.JavaFXConsole$2.handle(JavaFXConsole.java:58)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$KeyHandler.process(Scene.java:3931)
at javafx.scene.Scene$KeyHandler.access$1800(Scene.java:3877)
at javafx.scene.Scene.impl_processKeyEvent(Scene.java:2006)
at javafx.scene.Scene$ScenePeerListener.keyEvent(Scene.java:2468)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(GlassViewEventHandler.java:197)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(GlassViewEventHandler.java:147)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleKeyEvent(GlassViewEventHandler.java:227)
at com.sun.glass.ui.View.handleKeyEvent(View.java:544)
at com.sun.glass.ui.View.notifyKey(View.java:954)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$45(GtkApplication.java:126)
at com.sun.glass.ui.gtk.GtkApplication$$Lambda$42/379110473.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
最佳答案
我解决了这个问题，不需要关闭流。仅在每个命令末尾附加 \n 并刷新流。特别感谢我的 friend Julio Gessar，他在查看代码后为我提供了解决方案。这是代码。我希望这段代码可用于使用 Java 和 JavaFX 创建自定义终端或终端模拟器。感谢@colti 回答我的问题。
这是代码:
/**
*
* @author nika
*/
public class JavaFXConsole extends Application {
ProcessBuilder pb;
Process process;
TextArea ta;
String input = "";
int counter = 0;
BufferedReader stdInput, stdError;
OutputStream out;
//static BufferedReader stdInput, stdError;
//static Thread outputThread;
@Override
public void start(Stage primaryStage) throws InterruptedException {
ta = new TextArea("/bin/bash\n");
ta.setOnKeyTyped(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent event) {
{
input = input.concat(event.getCharacter());
System.out.println(input);
}
}
});
final KeyCombination keyComb1 = new KeyCodeCombination(KeyCode.C,
KeyCombination.CONTROL_DOWN);
ta.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent event) {
if (event.getCode() == KeyCode.ENTER) {
try {
//getOutPut(input+"\n");
String command = input.replaceAll("\r", "") + "\n";
command = input.replaceAll("\b", "");
out.write(command.getBytes());
out.flush();
//getOutPut(command);
input = "";
System.out.println("Command Sent");
} catch (IOException ex) {
Logger.getLogger(JavaFXConsole.class.getName()).log(Level.SEVERE, null, ex);
}
} else if (keyComb1.match(event)) {
System.out.println("Control+C pressed");
}else if (event.getCode()== KeyCode.BACK_SPACE){
// input=input.substring(0, input.length()-1);
// System.out.println(input);
}
}
});
HBox root = new HBox();
root.getChildren().add(ta);
pb = new ProcessBuilder("/bin/bash");
new Thread(new Runnable() {
@Override
public void run() {
try {
process = pb.start();
stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));
stdError = new BufferedReader(new InputStreamReader(process.getErrorStream()));
//OutputStream out;
out = process.getOutputStream();
StreamGobbler errorGobbler = new StreamGobbler(process.getErrorStream(), "ERROR");
// any output?
StreamGobbler outputGobbler = new StreamGobbler(process.getInputStream(), "OUTPUT");
// start gobblers
outputGobbler.start();
errorGobbler.start();
process.waitFor();
} catch (IOException ex) {
Logger.getLogger(JavaFXConsole.class.getName()).log(Level.SEVERE, null, ex);
} catch (InterruptedException ex) {
Logger.getLogger(JavaFXConsole.class.getName()).log(Level.SEVERE, null, ex);
}
}
}).start();
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
private class StreamGobbler extends Thread {
InputStream is;
String type;
private StreamGobbler(InputStream is, String type) {
this.is = is;
this.type = type;
}
@Override
public void run() {
try {
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line = null;
while ((line = br.readLine()) != null) {
System.out.println(type + "> " + line);
String str =line;
Platform.runLater(new Runnable() {
@Override
public void run() {
ta.appendText(">" + str + "\n");
}
});
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
关于JavaFX : Redirect Input/Output/Error From ProcessBuilder to TextArea?，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28070841/