Programming Forums > Application Development > Java

Mendicant · Dec 15th, 2005, 3:27 PM

Hello,

I'm currently developing a Java swing mud client, and have run into some trouble sending valid data to a listening mud.

My main class contains the following declarations

(Toggle Plain Text)

private Socket socket;
private BufferedReader in;
private BufferedOutputStream os;

where socket is the connection that I open, in is the text stream received from the mud server I connect to, and os is the output stream from which I send information to the mud.

I receive messages from the mud successfully and with no problem. Sending data back is the problem. I've fiddled with other output stream such as DataOutputStream, but it seems a lot of these format the data before sending it, which results in problems.

Here is the relevent code.

(Toggle Plain Text)

    private void connectToMud(String host, int port)
    {
        String x;
        try
        {
            socket = new Socket(host, port);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            os = new BufferedOutputStream(socket.getOutputStream());
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
        connected = true;
        Thread thread = new Thread(this);
        thread.start(); // We need the Socket-listening to be on a separate thread or
                        // Swing gets horribly confused and will freeze. :(
    }

    public void run() // method of Runnable interface!
    {
        try
        {
            int x;
            while(connected == true)
            {
                x = in.read();
                textArea.append(new Character((char)x).toString());
                repaint();
            }
            in.close();
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
    }

    private void sendInputToMud()
    {
        try
        {
            String str = textInput.getText();
            //char strchar[] = new char[str.length()];
            //strchar = str.toCharArray();
            //os.writeUTF(str);
            //os.flush();
            os.write(new Byte("r")); // The mud doesn't even receive this R!
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
    }

I've searched Google tirelessly and turned up nothing that helps me. Does anyone know the best way to go about this?

Thanks in advance.

andro · Dec 15th, 2005, 4:10 PM

A small snippet of code:

(Toggle Plain Text)

bw = new BufferedWriter(new OutputStreamWriter(smtpSock.getOutputStream()));

bw.write(data + CRLF);
bw.flush();

Mendicant · Dec 15th, 2005, 4:28 PM

Wonderful! This does it! Thanks so much. Now I have to clean up my output more and get some better error-handling.

Mendicant · Dec 15th, 2005, 7:49 PM

Ok, I've run into my next snag. I use a JTextArea to display information sent to my client from the MUD. This JTextArea is inside a JScrollPane named scrollPane.

Now, whenever I append text to this textArea, I don't want the vertical scrollbar to stay situated in the northern part of the JTextArea, I want it to become situated in the southern part. I've accomplished this through the following code whenever the textArea receives more text.

(Toggle Plain Text)

JScrollBar bar = scrollPane.getVerticalScrollBar();
bar.setValue(bar.getMaximum());

While this code works, it's rather jumpy and the bar will not always situate itself perfectly after receiving text quickly in succession. I've tried figuring out through the Java documentation if there is a way to change the JScrollPane's behavior so that it is essentially reversed but there is not. setPolicy merely lets you determine when/if scrollBars are displayed.

Anybody have any ideas how to go about this in a more efficient manner? I've also tried setting the caret position in the JTextArea to the last character, but that is even worse in regard to "jumpiness" and lag.

Thanks in advance.

Mendicant · Dec 15th, 2005, 9:45 PM

I hate replying to my own posts, but I figured out the problem. The best way to do something like this is to use the following code.

(Toggle Plain Text)

textArea.setCaretPosition(textArea.getDocument().getLength());

Rather than requesting and unrequesting the focus on the textArea, just set the caret's position. No noticeable lag and the scroll bars adjust properly.

At the bare minimum, I hope these posts help someone in the future who runs into this problem.

lectricpharaoh · Dec 19th, 2005, 5:33 AM

Quote:

Originally Posted by Mendicant

I hate replying to my own posts, but I figured out the problem. The best way to do something like this is to use the following code.

(Toggle Plain Text)

textArea.setCaretPosition(textArea.getDocument().getLength());

Rather than requesting and unrequesting the focus on the textArea, just set the caret's position. No noticeable lag and the scroll bars adjust properly.

At the bare minimum, I hope these posts help someone in the future who runs into this problem.

This should help me, thanks. I was planning on using a JTextArea inside a JScrollPane, just as you did, for one of my projects. Having not yet added enough text to cause scrolling, I didn't realize this would be an issue, but your information has pre-emptively allowed me to solve the problem.

Mendicant · Dec 19th, 2005, 8:44 PM

Awesome. Glad I could help.

Dec 15th, 2005, 3:27 PM	#1
Mendicant Newbie Join Date: Dec 2005 Location: PA, USA Posts: 8 Rep Power: 0	best way to send data to a listening mud server Hello, I'm currently developing a Java swing mud client, and have run into some trouble sending valid data to a listening mud. My main class contains the following declarations (Toggle Plain Text) private Socket socket; private BufferedReader in; private BufferedOutputStream os; private Socket socket; private BufferedReader in; private BufferedOutputStream os; where socket is the connection that I open, in is the text stream received from the mud server I connect to, and os is the output stream from which I send information to the mud. I receive messages from the mud successfully and with no problem. Sending data back is the problem. I've fiddled with other output stream such as DataOutputStream, but it seems a lot of these format the data before sending it, which results in problems. Here is the relevent code. (Toggle Plain Text) private void connectToMud(String host, int port) { String x; try { socket = new Socket(host, port); in = new BufferedReader(new InputStreamReader(socket.getInputStream())); os = new BufferedOutputStream(socket.getOutputStream()); } catch(Exception e) { System.out.println(e); } connected = true; Thread thread = new Thread(this); thread.start(); // We need the Socket-listening to be on a separate thread or // Swing gets horribly confused and will freeze. :( } public void run() // method of Runnable interface! { try { int x; while(connected == true) { x = in.read(); textArea.append(new Character((char)x).toString()); repaint(); } in.close(); } catch(Exception e) { System.out.println(e); } } private void sendInputToMud() { try { String str = textInput.getText(); //char strchar[] = new char[str.length()]; //strchar = str.toCharArray(); //os.writeUTF(str); //os.flush(); os.write(new Byte("r")); // The mud doesn't even receive this R! } catch(Exception e) { System.out.println(e); } } private void connectToMud(String host, int port) { String x; try { socket = new Socket(host, port); in = new BufferedReader(new InputStreamReader(socket.getInputStream())); os = new BufferedOutputStream(socket.getOutputStream()); } catch(Exception e) { System.out.println(e); } connected = true; Thread thread = new Thread(this); thread.start(); // We need the Socket-listening to be on a separate thread or // Swing gets horribly confused and will freeze. :( } public void run() // method of Runnable interface! { try { int x; while(connected == true) { x = in.read(); textArea.append(new Character((char)x).toString()); repaint(); } in.close(); } catch(Exception e) { System.out.println(e); } } private void sendInputToMud() { try { String str = textInput.getText(); //char strchar[] = new char[str.length()]; //strchar = str.toCharArray(); //os.writeUTF(str); //os.flush(); os.write(new Byte("r")); // The mud doesn't even receive this R! } catch(Exception e) { System.out.println(e); } } I've searched Google tirelessly and turned up nothing that helps me. Does anyone know the best way to go about this? Thanks in advance.

Dec 15th, 2005, 4:10 PM	#2
andro Professional Programmer Join Date: Oct 2005 Location: California Posts: 310 Rep Power: 3	A small snippet of code: (Toggle Plain Text) bw = new BufferedWriter(new OutputStreamWriter(smtpSock.getOutputStream())); bw.write(data + CRLF); bw.flush(); bw = new BufferedWriter(new OutputStreamWriter(smtpSock.getOutputStream())); bw.write(data + CRLF); bw.flush();

Dec 15th, 2005, 7:49 PM	#4
Mendicant Newbie Join Date: Dec 2005 Location: PA, USA Posts: 8 Rep Power: 0	Scrollpane Magic Ok, I've run into my next snag. I use a JTextArea to display information sent to my client from the MUD. This JTextArea is inside a JScrollPane named scrollPane. Now, whenever I append text to this textArea, I don't want the vertical scrollbar to stay situated in the northern part of the JTextArea, I want it to become situated in the southern part. I've accomplished this through the following code whenever the textArea receives more text. (Toggle Plain Text) JScrollBar bar = scrollPane.getVerticalScrollBar(); bar.setValue(bar.getMaximum()); JScrollBar bar = scrollPane.getVerticalScrollBar(); bar.setValue(bar.getMaximum()); While this code works, it's rather jumpy and the bar will not always situate itself perfectly after receiving text quickly in succession. I've tried figuring out through the Java documentation if there is a way to change the JScrollPane's behavior so that it is essentially reversed but there is not. setPolicy merely lets you determine when/if scrollBars are displayed. Anybody have any ideas how to go about this in a more efficient manner? I've also tried setting the caret position in the JTextArea to the last character, but that is even worse in regard to "jumpiness" and lag. Thanks in advance.

Dec 15th, 2005, 9:45 PM	#5
Mendicant Newbie Join Date: Dec 2005 Location: PA, USA Posts: 8 Rep Power: 0	I hate replying to my own posts, but I figured out the problem. The best way to do something like this is to use the following code. (Toggle Plain Text) textArea.setCaretPosition(textArea.getDocument().getLength()); textArea.setCaretPosition(textArea.getDocument().getLength()); Rather than requesting and unrequesting the focus on the textArea, just set the caret's position. No noticeable lag and the scroll bars adjust properly. At the bare minimum, I hope these posts help someone in the future who runs into this problem.

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Dec 15th, 2005, 4:28 PM	#3
Mendicant Newbie Join Date: Dec 2005 Location: PA, USA Posts: 8 Rep Power: 0	Wonderful! This does it! Thanks so much. Now I have to clean up my output more and get some better error-handling.

Dec 19th, 2005, 8:44 PM	#7
Mendicant Newbie Join Date: Dec 2005 Location: PA, USA Posts: 8 Rep Power: 0	Awesome. Glad I could help.

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Programming Forums > Application Development > Java

best way to send data to a listening mud server