Java Programming Code Examples
Java > Applets Code Examples
Socket Applet
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Socket Applet
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
public class SocketApplet extends Applet {
TextField nameTF, passTF, domainTF;
Image im;
Button sendButton;
/** Where the Applet came from */
URL whence;
//+
/** Initialize the GUI nicely. */
public void init() {
Label aLabel;
setLayout(new GridBagLayout());
int LOGO_COL = 1;
int LABEL_COL = 2;
int TEXT_COL = 3;
int BUTTON_COL = 1;
GridBagConstraints gbc = new GridBagConstraints();
gbc.weightx = 100.0; gbc.weighty = 100.0;
gbc.gridx = LABEL_COL; gbc.gridy = 0;
gbc.anchor = GridBagConstraints.EAST;
add(aLabel = new Label("Name:", Label.CENTER), gbc);
gbc.anchor = GridBagConstraints.CENTER;
gbc.gridx = TEXT_COL; gbc.gridy = 0;
add(nameTF=new TextField(10), gbc);
gbc.gridx = LABEL_COL; gbc.gridy = 1;
gbc.anchor = GridBagConstraints.EAST;
add(aLabel = new Label("Password:", Label.CENTER), gbc);
gbc.anchor = GridBagConstraints.CENTER;
gbc.gridx = TEXT_COL; gbc.gridy = 1;
add(passTF=new TextField(10), gbc);
passTF.setEchoChar('*');
gbc.gridx = LABEL_COL; gbc.gridy = 2;
gbc.anchor = GridBagConstraints.EAST;
add(aLabel = new Label("Domain:", Label.CENTER), gbc);
gbc.anchor = GridBagConstraints.CENTER;
gbc.gridx = TEXT_COL; gbc.gridy = 2;
add(domainTF=new TextField(10), gbc);
sendButton = new Button("Send data");
gbc.gridx = BUTTON_COL; gbc.gridy = 3;
gbc.gridwidth = 3;
add(sendButton, gbc);
whence = getCodeBase();
// Now the action begins...
sendButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
String name = nameTF.getText();
if (name.length() == 0) {
showStatus("Name required");
return;
}
String domain = domainTF.getText();
if (domain.length() == 0) {
showStatus("Domain required");
return;
}
showStatus("Connecting to host " + whence.getHost() +
" as " + nameTF.getText());
try {
Socket s = new Socket(getCodeBase().getHost(),
SocketServer.PORT);
PrintWriter pf = new PrintWriter(s.getOutputStream(), true);
// send login name
pf.println(nameTF.getText());
// passwd
pf.println(passTF.getText());
// and domain
pf.println(domainTF.getText());
BufferedReader is = new BufferedReader(
new InputStreamReader(s.getInputStream()));
String response = is.readLine();
showStatus(response);
} catch (IOException e) {
showStatus("ERROR: " + e.getMessage());
}
}
});
}
//-
}
/*
<APPLET CODE="SocketApplet" width=300 height=120>
</APPLET>
*/
