в 17:43, 31 мая 2010

2010-05-31T17:43:48Z

Admin: 1 версия

2010-05-31T14:43:51Z

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== 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>

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в 17:43, 31 мая 2010

Admin: 1 версия