Java by API/javax.microedition.io/Connector

Connector: open(String name) throws IOException

   <source lang="java">

import java.io.IOException; import java.util.Calendar; import java.util.Date; import javax.microedition.io.Connector; import javax.microedition.io.Datagram; import javax.microedition.io.DatagramConnection; public class J2METimeServer {

   public static void main(String[] args) {
               
       try {
           Calendar cal = Calendar.getInstance();
           DatagramConnection receiver = 
                   (DatagramConnection)Connector.open("datagram://");
           byte[] buffer = new byte[256];
           Datagram dgram = receiver.newDatagram(buffer, buffer.length);
           for (;;) {
               dgram.setLength(buffer.length);
               receiver.receive(dgram);
               cal.setTime(new Date());
               String time = cal.toString();
               byte[] dataBytes = time.getBytes();
               System.arraycopy(dataBytes, 0, buffer, 0, dataBytes.length);
               dgram.setLength(dataBytes.length);
               receiver.send(dgram);
           }
       } catch (IOException ex) {
           System.out.println("IOException: " + ex);
       }
   }

}

 </source>
   
  
 
  

Connector.READ_WRITE

   <source lang="java">

import java.io.InputStream; import java.io.IOException; import java.io.OutputStream; import javax.microedition.io.Connector; import javax.microedition.io.HttpConnection; import javax.microedition.lcdui.Alert; import javax.microedition.lcdui.AlertType; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.StringItem; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; import javax.microedition.midlet.MIDletStateChangeException; public class HttpMIDlet extends MIDlet implements CommandListener, Runnable {

 private Display display;
 private Form addressForm = new Form("HTTP Client");
 private Form connectForm = new Form("Connecting");
 private Form displayForm = new Form("Server Reply");
 private TextField serverURL = new TextField("URL:", "", 256, TextField.ANY);
 private StringItem messageLabel = new StringItem(null, "Connecting...\nPlease wait.");
 private Command okCommand = new Command("OK", Command.OK, 0);
 private Command exitCommand = new Command("Exit", Command.EXIT, 0);
 private Command backCommand = new Command("Back", Command.BACK, 0);
 
 protected void startApp() throws MIDletStateChangeException {
   display = Display.getDisplay(this);
   addressForm.append(serverURL);
   addressForm.addCommand(okCommand);
   addressForm.addCommand(exitCommand);
   addressForm.setCommandListener(this);
   connectForm.append(messageLabel);
   connectForm.addCommand(backCommand);
   connectForm.setCommandListener(this);
   displayForm.append(messageLabel);
   displayForm.addCommand(backCommand);
   displayForm.setCommandListener(this);
   display.setCurrent(addressForm);
 }
 protected void pauseApp() {
 }
 protected void destroyApp(boolean unconditional)
     throws MIDletStateChangeException {
 }
 public void commandAction(Command cmd, Displayable d) {
   if (cmd == okCommand) {
     Thread t = new Thread(this);
     t.start();
     display.setCurrent(connectForm);
   } else if (cmd == backCommand) {
     display.setCurrent(addressForm);
   } else if (cmd == exitCommand) {
     try {
       destroyApp(true);
     } catch (MIDletStateChangeException ex) {
     }
     notifyDestroyed();
   }
 }
 public void run() {
   InputStream is = null;
   HttpConnection conn = null;
   try {
     String url = serverURL.getString();
     if (!url.startsWith("http://") && !url.startsWith("https://")) {
       url = "http://" + url;
     }
     conn = (HttpConnection) Connector.open(url, Connector.READ_WRITE);
     if (conn.getResponseCode() == HttpConnection.HTTP_OK) {
       is = conn.openInputStream();
       final int MAX_LENGTH = 128;
       byte[] buf = new byte[MAX_LENGTH];
       int total = 0;
       while (total < MAX_LENGTH) {
         int count = is.read(buf, total, MAX_LENGTH - total);
         if (count < 0) {
           break;
         }
         total += count;
       }
       is.close();
       String reply = new String(buf, 0, total);
       messageLabel.setText(reply);
     } else {
       messageLabel.setText("Failed: error " + conn.getResponseCode() + "\n"+ conn.getResponseMessage());
     }
     conn.close();
     display.setCurrent(displayForm);
   } catch (IOException ex) {
     System.out.println(ex);
     ex.printStackTrace();
     Alert alert = new Alert("I/O Error","An error occurred while communicating with the server.", null,AlertType.ERROR);
     alert.setTimeout(Alert.FOREVER);
     display.setCurrent(alert, addressForm);
     return;
   }
 }

}

 </source>