Shikha Upadhyaya

I am developing an application which has to dynamically plot a graph by reading the values in a log file which is refreshed every hour and which resides in a remote machine. I am using JChart2D library for the same. I am unable to find how to start off.

As of now, I am reading all the log files and storing it in the local system. But that would not serve the purpose as the values keep changing every hour. Kindly guide.

I am learning how to create dynamic charts using JChart2D. Can anyone let me know what is this itrace in the following code?
package my.jchart2d; import info.monitorenter.gui.chart.Chart2D; import info.monitorenter.gui.chart.ITrace2D; import info.monitorenter.gui.chart.io.ADataCollector; import info.monitorenter.gui.chart.io.RandomDataCollectorOffset; import info.monitorenter.gui.chart.traces.Trace2DLtd; import java.awt.Color; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; public class JChart2DDemo { private JChart2DDemo() { super(); } public static void main(String[] args) { // Create a chart: Chart2D chart = new Chart2D(); // Create an ITrace: // Note that dynamic charts need limited amount of values!!! ITrace2D trace = new Trace2DLtd(200); trace.setColor(Color.RED); // Add the trace to the chart. This has to be done before adding points (deadlock prevention): chart.addTrace(trace); // Make it visible: // Create a frame. JFrame frame = new JFrame("MinimalDynamicChart"); // add the chart to the frame: frame.getContentPane().add(chart); frame.setSize(400,300); // Enable the termination button [cross on the upper right edge]: frame.addWindowListener( new WindowAdapter(){ public void windowClosing(WindowEvent e){ System.exit(0); } } ); frame.setVisible(true); // Every 50 milliseconds a new value is collected. ADataCollector collector = new RandomDataCollectorOffset(trace, 100); // Start an internal Thread that adds the values: collector.start(); } }

Thanks all

Digen Mahara wrote:Shikha as Michael Dunn said use the dispose() method
eg : if your parent frame is Form1 then it works like this

Form1 form1=new Form1();

JFrame f=new JFrame(); f.setVisible(true); f.setSize(300,200); /*Add this line of code*/ form1.dispose(); //here form1 is the Object of the parent Frame this method shall close the Parent Frame

I am not able to do this because my code is something like this:
public class PmtGui extends JFrame { private JPanel contentPane; private JTextField textFieldHN; private JTextField textFieldPW; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { PmtGui frame = new PmtGui(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public PmtGui() { setTitle("Performance Monitor Tool for 8950 SAM"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); JLabel lblHostName = new JLabel("Host Name:"); lblHostName.setFont(new Font("Tahoma", Font.BOLD, 12)); lblHostName.setBounds(117, 83, 83, 14); contentPane.add(lblHostName); JLabel lblPassword = new JLabel("Password:"); lblPassword.setFont(new Font("Tahoma", Font.BOLD, 12)); lblPassword.setBounds(117, 127, 67, 14); contentPane.add(lblPassword); textFieldHN = new JTextField(); textFieldHN.setBounds(210, 81, 122, 20); contentPane.add(textFieldHN); textFieldHN.setColumns(10); JButton btnConnect = new JButton("Connect"); btnConnect.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String host = textFieldHN.getText(); String passwd = textFieldPW.getText(); try { String user = host.substring(0, host.indexOf('@')); host = host.substring(host.indexOf('@')+1); JSch jsch=new JSch(); Session session=jsch.getSession(user, host, 22); java.util.Properties config = new java.util.Properties(); config.put("StrictHostKeyChecking", "no"); session.setConfig(config); session.setHost(host); session.setPassword(passwd); session.connect(); Channel channel = session.openChannel("shell"); channel.setInputStream(System.in); channel.setOutputStream(System.out); channel.connect(); JOptionPane.showMessageDialog(null, "Connection successful"); contentPane.setVisible(false); JFrame f=new JFrame(); f.setVisible(true); f.setSize(300,200); } catch (Exception e){ JOptionPane.showMessageDialog(null, "Incorrect hostname/password."); } } }); btnConnect.setBounds(117, 193, 89, 23); contentPane.add(btnConnect); JButton btnCancel = new JButton("Cancel"); btnCancel.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent arg0) { PmtGui.this.dispose(); } }); btnCancel.setBounds(234, 193, 89, 23); contentPane.add(btnCancel); JLabel lblConnectToServer = new JLabel("Connect to Server"); lblConnectToServer.setFont(new Font("Tahoma", Font.BOLD, 13)); lblConnectToServer.setBounds(148, 29, 146, 14); contentPane.add(lblConnectToServer); textFieldPW = new JPasswordField(20); textFieldPW.setBounds(210, 125, 122, 20); contentPane.add(textFieldPW); textFieldPW.setColumns(10); } }

I tried this code and it worked fine.
JFrame f=new JFrame(); f.setVisible(true); f.setSize(300,200);
I now want to know how to close the parent frame automatically when the OK button is clicked.

Hi,
I have a form which takes username and password and authenticates the user. I need to open a new form once OK is clicked. How to I do it?

Shahzad Latif wrote:If you want to open multiple files at the same time and extract data from those files then you will have to try multithreading. In this way, you'll be able to read one file per thread. Please see the following two help topics on multithreading in Java:

http://www.roseindia.net/java/thread/Java-Multithreading.shtml (Conceptual)
http://www.tutorialspoint.com/java/java_multithreading.htm (Code Example)

Ok thanks. I will try this.

I have a couple of log files containing CPU usage data, memory usage data etc in a remote system. I have to consolidate them and display them as a dynamic data which will refresh every hour. My question is how to extract only the data what we need from these files (selective extraction) at a time with one click.

I have been able to retrieve one file at a time but not multiple files.

Riaan Nel wrote:Look at line 108. You want to close the frame, but all you do is to make the components on your frame invisible. You need to dispose of the frame.

Something like this.
PmtGui.this.dispose();

The PmtGui.this is used to tell your anonymous inner class (MouseAdapter) that you are referring to the outer class (PmtGui).

On a side note, don't use MouseListeners on buttons. If you disable the button, the MouseListener will still register events. Rather use an ActionListener.

Ok. Thanks It's working now

I am trying to write the mouseClicked event for the "Cancel button" where the entire window has to close on pressing the Cancel button. I wrote the following code:
package my.initPckg; import com.jcraft.jsch.*; import java.awt.*; import javax.swing.*; import java.awt.BorderLayout; import java.awt.EventQueue; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.border.EmptyBorder; import javax.swing.JLabel; import java.awt.Font; import javax.swing.JOptionPane; import javax.swing.SwingConstants; import javax.swing.JTextField; import javax.swing.JPasswordField; import javax.swing.JButton; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; public class PmtGui extends JFrame { private JPanel contentPane; private JTextField textFieldHN; private JTextField textFieldPW; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { PmtGui frame = new PmtGui(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public PmtGui() { setTitle("Performance Monitor Tool for 8950 SAM"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); JLabel lblHostName = new JLabel("Host Name:"); lblHostName.setFont(new Font("Tahoma", Font.BOLD, 12)); lblHostName.setBounds(117, 83, 83, 14); contentPane.add(lblHostName); JLabel lblPassword = new JLabel("Password:"); lblPassword.setFont(new Font("Tahoma", Font.BOLD, 12)); lblPassword.setBounds(117, 127, 67, 14); contentPane.add(lblPassword); textFieldHN = new JTextField(); textFieldHN.setBounds(210, 81, 122, 20); contentPane.add(textFieldHN); textFieldHN.setColumns(10); JButton btnConnect = new JButton("Connect"); btnConnect.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent arg0) { String host = textFieldHN.getText(); String passwd = textFieldPW.getText(); String user = host.substring(0, host.indexOf('@')); host = host.substring(host.indexOf('@')+1); try { JSch jsch=new JSch(); Session session=jsch.getSession(user, host, 22); java.util.Properties config = new java.util.Properties(); config.put("StrictHostKeyChecking", "no"); session.setConfig(config); session.setHost(host); session.setPassword(passwd); session.connect(); Channel channel = session.openChannel("shell"); channel.setInputStream(System.in); channel.setOutputStream(System.out); channel.connect(); } catch (Exception e){ System.out.println(e); } } }); btnConnect.setBounds(117, 193, 89, 23); contentPane.add(btnConnect); JButton btnCancel = new JButton("Cancel"); btnCancel.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent arg0) { contentPane.setVisible(false); } }); btnCancel.setBounds(234, 193, 89, 23); contentPane.add(btnCancel); JLabel lblConnectToServer = new JLabel("Connect to Server"); lblConnectToServer.setFont(new Font("Tahoma", Font.BOLD, 13)); lblConnectToServer.setBounds(148, 29, 146, 14); contentPane.add(lblConnectToServer); textFieldPW = new JPasswordField(20); textFieldPW.setBounds(210, 125, 122, 20); contentPane.add(textFieldPW); textFieldPW.setColumns(10); } }
But, when I run this code, only the contents of the window get erased and the window remains unclosed. Please let me know what has to be written between lines 104 and 110.

Hi, it is working now. I followed this link. But I am not able to figure out what exactly has been done so that my code is working fine now.

Tim Moores wrote:Correct. Is that host name resolvable on the machine where you're running the code? It sure is not on mine.

Yes, the hostname is resolvable. When I tried out this out it is working fine. But when I tried to write something on my own, I is not working out.

Tim Moores wrote:Well, what do you think the error message is trying to tell you?

I guess it is not able to locate the host. Is it right?

Tim Moores wrote:So the problem is solved now?

No. It's not solved.

Tim Moores wrote:Are you going to tell us what exception that was, and in which line of code it happened, or are we supposed to guess?

Oh sorry. Here's the exception:
com.jcraft.jsch.JSchException: UnknownHostKey: krishna.host.com.