import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
/** GUI for TestOpenMailRelay, lets you run it multiple times in one JVM
* to avoid startup delay.
*
* Starts each in its own Thread for faster return to ready state.
*
* Uses PipedI/OStreams to capture system.out/err into a window.
*/
public class TestOpenMailRelayGUI extends JFrame {
/** The one-line textfield for the user to type Host name/IP */
JTextField hostTextField;
/** Multi-line text area for results. */
JTextArea results;
/** The piped stream for the main class to write into "results" */
PrintStream ps;
/** The piped stream to read from "ps" into "results" */
DataInputStream iis;
/** This inner class is the action handler both for pressing
* the "Try" button and also for pressing <ENTER> in the text
* field. It gets the IP name/address from the text field
* and passes it to process() in the main class.
*/
ActionListener runner = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
new Thread(new Runnable() {
public void run() {
String host = hostTextField.getText().trim();
ps.println("Trying " + host);
TestOpenMailRelay.process(host, ps);
}
}).start();
}
};
/** Construct a GUI and some I/O plumbing to get the output
* of "TestOpenMailRelay" into the "results" textfield.
*/
public TestOpenMailRelayGUI() throws IOException {
super("Tests for Open Mail Relays");
PipedInputStream is;
PipedOutputStream os;
JPanel p;
Container cp = getContentPane();
cp.add(BorderLayout.NORTH, p = new JPanel());
// The entry label and text field.
p.add(new JLabel("Host:"));
p.add(hostTextField = new JTextField(10));
hostTextField.addActionListener(runner);
JButton b;
p.add(b = new JButton("Try"));
b.addActionListener(runner);
results = new JTextArea(20, 60);
// Add the text area to the main part of the window (CENTER).
// Wrap it in a JScrollPane to make it scroll automatically.
cp.add(BorderLayout.CENTER, new JScrollPane(results));
pack(); // end of GUI portion
// Create a pair of Piped Streams.
is = new PipedInputStream();
os = new PipedOutputStream(is);
iis = new DataInputStream(is);
ps = new PrintStream(os);
// Construct and start a Thread to copy data from "is" to "os".
new Thread() {
public void run() {
try {
String line;
while ((line = iis.readLine()) != null) {
results.append(line);
results.append("\n");
}
} catch(IOException ex) {
results.append("\n");
results.append("*** Input or Output error ***\n");
results.append(ex.toString());
return;
}
}
}.start();
}
}
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