QuoteClientAppletpublic class QuoteClientApplet extends Applet
Fields Summary |
---|
boolean | DEBUG | InetAddress | address | TextField | portField | Label | display | DatagramSocket | socket |
Methods Summary |
---|
public boolean | action(java.awt.Event event, java.lang.Object arg)
int port;
try {
port = Integer.parseInt(portField.getText());
} catch (NumberFormatException e) {
//No integer entered. Should warn the user.
return true;
}
doIt(port);
return true;
| void | doIt(int port)
DatagramPacket packet;
byte[] sendBuf = new byte[256];
packet = new DatagramPacket(sendBuf, 256, address, port);
try { // send request
if (DEBUG) {
System.out.println("Applet about to send packet to address "
+ address + " at port " + port);
}
socket.send(packet);
if (DEBUG) {
System.out.println("Applet sent packet.");
}
} catch (IOException e) {
System.out.println("Applet socket.send failed:");
e.printStackTrace();
return;
}
packet = new DatagramPacket(sendBuf, 256);
try { // get response
if (DEBUG) {
System.out.println("Applet about to call socket.receive().");
}
socket.receive(packet);
if (DEBUG) {
System.out.println("Applet returned from socket.receive().");
}
} catch (IOException e) {
System.out.println("Applet socket.receive failed:");
e.printStackTrace();
return;
}
String received = new String(packet.getData(), 0);
if (DEBUG) {
System.out.println("Quote of the Moment: " + received);
}
display.setText(received);
| public void | init()
//Initialize networking stuff.
String host = getCodeBase().getHost();
try {
address = InetAddress.getByName(host);
} catch (UnknownHostException e) {
System.out.println("Couldn't get Internet address: Unknown host");
// What should we do?
}
try {
socket = new DatagramSocket();
} catch (IOException e) {
System.out.println("Couldn't create new DatagramSocket");
return;
}
//Set up the UI.
GridBagLayout gridBag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints();
setLayout(gridBag);
Label l1 = new Label("Quote of the Moment:", Label.CENTER);
c.anchor = GridBagConstraints.SOUTH;
c.gridwidth = GridBagConstraints.REMAINDER;
gridBag.setConstraints(l1, c);
add(l1);
display = new Label("(no quote received yet)", Label.CENTER);
c.anchor = GridBagConstraints.NORTH;
c.weightx = 1.0;
c.fill = GridBagConstraints.HORIZONTAL;
gridBag.setConstraints(display, c);
add(display);
Label l2 = new Label("Enter the port (on host " + host
+ ") to send the request to:",
Label.RIGHT);
c.anchor = GridBagConstraints.SOUTH;
c.gridwidth = 1;
c.weightx = 0.0;
c.weighty = 1.0;
c.fill = GridBagConstraints.NONE;
gridBag.setConstraints(l2, c);
add(l2);
portField = new TextField(6);
gridBag.setConstraints(portField, c);
add(portField);
Button button = new Button("Send");
gridBag.setConstraints(button, c);
add(button);
validate();
| public java.awt.Insets | insets()
return new Insets(4,4,5,5);
| public void | paint(java.awt.Graphics g)
Dimension d = size();
Color bg = getBackground();
g.setColor(bg);
g.draw3DRect(0, 0, d.width - 1, d.height - 1, true);
g.draw3DRect(3, 3, d.width - 7, d.height - 7, false);
|
|