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Java - String2MD5

public static byte[] getKeyedDigest(byte[] buffer, byte[] key) {
   try {
      MessageDigest md5 = MessageDigest.getInstance("MD5");
      md5.update(buffer);
      return md5.digest(key);
   } catch (NoSuchAlgorithmException nsae) {}

   return null;
}
to hash java string md5 text by whitetiger on Feb 28, 2007

Java - Splitta una stringa

	// Splitta una stringa
	private String[] splitString(String str, String delims)
	{
		if(str == null)
			return null;
		else if(str.equals("") || delims == null || delims.length() == 0)
			return new String[]{ str };
		
		String[] s;
	  	Vector v = new Vector();
		
	  	int pos = 0;
		int newpos = str.indexOf(delims, pos);;

		while(newpos != -1)
		{
			v.addElement(str.substring(pos, newpos));
			pos = newpos + delims.length();
			newpos = str.indexOf(delims, pos);
		}
		v.addElement(str.substring(pos));
		
		s = new String[v.size()];
		for(int i=0, cnt=s.length; i<cnt; i++)
			s[i] = (String) v.elementAt(i);
		
		return s;
	}
to java string array text split delims by whitetiger on Feb 26, 2007 3 Comments

J2ME - Alert Bloccante

// description of your code here

import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;

public class MessageBox extends Alert implements CommandListener
{
	protected Chattando midlet;
	
	private boolean isReady = false;
	
	private Displayable dspBACK;
	
	public MessageBox(String title, String text, AlertType type, Chattando midlet)
	{
		super(title, text, null, type);
		
		this.midlet = midlet;
		
		this.setCommandListener(this);
		this.setTimeout(Alert.FOREVER);
		
		// Display Precedente
		dspBACK = midlet.getDisplay().getCurrent();
		
		// Mostra l'alert
		midlet.getDisplay().setCurrent(this);
		
		// Attendi la conferma di chiusura
		waitForDone();
		
		// Visualizza il precedente Display
		midlet.getDisplay().setCurrent(dspBACK);
	}
	
	private void waitForDone()
	{
		try
		{
			while(!isReady)
			{
				synchronized(this)
				{
					this.wait();
					
				}
			}
		}
		catch(Exception error)
		{
			
		}
	}

	public void commandAction(Command cmd, Displayable dsp)
	{
		if(cmd == Alert.DISMISS_COMMAND)
		{
			isReady = true;
			
			synchronized(this)
			{
				this.notify();
			}			
		}
	}
}
to java alert block j2me microedition midlet by whitetiger on Feb 24, 2007

Java - Dom Parser Example

// Simple Parser XML with DOM

package parser;

import java.io.File;
import java.io.IOException;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class DOMParser
{
	private Document doc = null;
	
	public DOMParser()
	{
		try
		{
			doc = parserXML(new File("parser/file.xml"));
			
			visit(doc, 0);
		}
		catch(Exception error)
		{
			error.printStackTrace();
		}
	}
	
	public void visit(Node node, int level)
	{
		NodeList nl = node.getChildNodes();
		
		for(int i=0, cnt=nl.getLength(); i<cnt; i++)
		{
			System.out.println("["+nl.item(i)+"]");
			
			visit(nl.item(i), level+1);
		}
	}
	
	public Document parserXML(File file) throws SAXException, IOException, ParserConfigurationException
	{
		return DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(file);
	}
	
	public static void main(String[] args)
	{
		new DOMParser();
	}
}
to dom java xml parser file by whitetiger on Feb 23, 2007 1 Comments

J2ME - Create Service Bluetooth

// Create Service Bluetooth

import javax.bluetooth.DiscoveryAgent;
import javax.bluetooth.LocalDevice;
import javax.microedition.io.Connector;
import javax.microedition.io.StreamConnection;
import javax.microedition.io.StreamConnectionNotifier;

public class ServerChat
{
	private static final String CHATTANDO_UUID = "A1A2A3A4A5A6A7A8A9A0B1B2B3B4B5B6";
	private static final String CHATTANDO_SERVICE = "Chattando";
	
	private boolean isReady = false;
	
	private StreamConnection stream_connection;
	private StreamConnectionNotifier stream_connection_notifier;
	
	public ServerChat()
	{
		startServerChatBluetooth();
	}
	
	// Apre il servizio per la Chat
	public void startServerChatBluetooth()
	{
		new Thread()
		{
			public void run()
			{
				try
				{
					LocalDevice.getLocalDevice().setDiscoverable(DiscoveryAgent.GIAC);
				}
				catch(Exception error)
				{
					error.printStackTrace();
				}
				
				try
				{
					stream_connection_notifier = (StreamConnectionNotifier) Connector.open("btspp://localhost:" + CHATTANDO_UUID + ";name=" + CHATTANDO_SERVICE);
				}
				catch(Exception error)
				{
					error.printStackTrace();
				}
				
				stopServerChatBluetooth();
				
				// Mette in ascolto il Server della Chat
				isReady = true;
				
				try
				{
					while(isReady)
					{
						System.out.println("Sono in ascolto...");
						
						stream_connection = stream_connection_notifier.acceptAndOpen();
						
						System.out.println("Client Connected");
					}
				}
				catch(Exception error)
				{
					error.printStackTrace();
				}
			}
			
		}.start();
	}

	// Chiude il servizio per la Chat
	public void stopServerChatBluetooth()
	{
		if(isReady)
		{
			isReady = false;
			
			try
			{
				stream_connection_notifier.close();
			}
			catch(Exception error)
			{
				error.printStackTrace();
			}
		}
	}
}
to java bluetooth search client service j2me microedition midlet device by whitetiger on Feb 23, 2007

J2ME - Search Service Bluetooth

// Example Search Service Bluetooth

import java.util.Vector;

import javax.bluetooth.DeviceClass;
import javax.bluetooth.DiscoveryAgent;
import javax.bluetooth.DiscoveryListener;
import javax.bluetooth.LocalDevice;
import javax.bluetooth.RemoteDevice;
import javax.bluetooth.ServiceRecord;
import javax.bluetooth.UUID;

public class ClientChat implements DiscoveryListener
{
	private static final String CHATTANDO_UUID = "A1A2A3A4A5A6A7A8A9A0B1B2B3B4B5B6";
	private static final String CHATTANDO_SERVICE = "Chattando";

	protected Chattando midlet;
	
	private boolean searchDone = false;
	
	private DiscoveryAgent discovery_agent;
	
	private Vector remote_device;
	private Vector device_found;
	
	public ClientChat(Chattando midlet)
	{
		this.midlet = midlet;
		
		startScanBluetoothDevices();
	}
	
	// Avvia la ricerca dei dispositivi Bluetooth
	public void startScanBluetoothDevices()
	{
		try
		{
			remote_device = new Vector();
			device_found = new Vector();
			
			discovery_agent = LocalDevice.getLocalDevice().getDiscoveryAgent();
			discovery_agent.startInquiry(DiscoveryAgent.GIAC, this);
		}
		catch(Exception error)
		{
			error.printStackTrace();
		}
	}
	
	// Stoppa la ricerca dei dispositivi Bluetooth
	public void stopScanBluetoothDevices()
	{
		discovery_agent.cancelInquiry(this);
	}

	public void deviceDiscovered(RemoteDevice btDevice, DeviceClass cod) 
	{
		// Aggiungo il dispositivo solo se e' un computer (0x0100) o un cellulare (0x0200)
		if(cod.getMajorDeviceClass() == 0x0100 || cod.getMajorDeviceClass() == 0x0200)
			remote_device.addElement(btDevice);
	}

	public void inquiryCompleted(int discType)
	{
		switch(discType)
		{
			case DiscoveryListener.INQUIRY_COMPLETED:
														System.out.println("Device Search Completed");
														
														break;
				
			case DiscoveryListener.INQUIRY_ERROR:
														System.out.println("Device Search Error");
														
														break;
				
			case DiscoveryListener.INQUIRY_TERMINATED:
														System.out.println("Device Search Terminated");
														
														break;
		}
		
		try
		{
			for(int i=0, cnt=remote_device.size(); i<cnt; i++)
			{
				discovery_agent.searchServices(new int[]{ 0x0100, 0x0200 }, new UUID[]{ new UUID(0x0003), new UUID(CHATTANDO_UUID, false) }, (RemoteDevice) remote_device.elementAt(i), this);
				waitForSearchDone();
			}
		}
		catch(Exception error)
		{
			error.printStackTrace();
		}
	}

	// Aspetta che la ricerca dei servizi per il dispositivo sia terminata
	private void waitForSearchDone()
	{
		searchDone = false;
		
		try
		{
			while(!searchDone)
			{
				synchronized(this)
				{
					this.wait();
				}
			}
		}
		catch(Exception error)
		{
			
		}
	}
	
	public void serviceSearchCompleted(int transID, int respCode)
	{
		switch(respCode)
		{
			case DiscoveryListener.SERVICE_SEARCH_COMPLETED:
																		System.out.println("Service Search Completed");
																		
																		break;
				
			case DiscoveryListener.SERVICE_SEARCH_DEVICE_NOT_REACHABLE:
																		System.out.println("Service Search Device not Reachable");
																		
																		break;
				
			case DiscoveryListener.SERVICE_SEARCH_ERROR:
																		System.out.println("Service Search Error");
																		
																		break;
				
			case DiscoveryListener.SERVICE_SEARCH_NO_RECORDS:
																		System.out.println("Service Search No Records");
																		
																		break;
				
			case DiscoveryListener.SERVICE_SEARCH_TERMINATED:
																		System.out.println("Service Search Terminated");
																		
																		break;
		}
		
		searchDone = true;
		
		// Risveglia il processo in attesa del completamento della ricerca dei servizi per un dispositivo
		synchronized(this)
		{
			this.notifyAll();
		}
	}

	public void servicesDiscovered(int transID, ServiceRecord[] servRecord)
	{
		for(int i=0, cnt=servRecord.length; i<cnt; i++)
		{
			if(((String) servRecord[i].getAttributeValue(0x0100).getValue()).equalsIgnoreCase(CHATTANDO_SERVICE))
			{
				device_found.addElement(servRecord[i].getHostDevice());
			}
		}
	}
}
to java bluetooth search client service j2me microedition midlet device by whitetiger on Feb 23, 2007

Java - PasswordField

JPasswordField passField = new JPasswordField(10);
passField.setEchoChar('*');
to java text password field by whitetiger on Jan 16, 2007

J2ME - Rescale Image

// description of your code here

private Image rescaleImage(Image image, int width, int height)
	{
		int sourceWidth = image.getWidth();
		int sourceHeight = image.getHeight();
	
		Image newImage = Image.createImage(width, height);
		Graphics g = newImage.getGraphics();
		
		for(int y=0; y<height; y++)
		{
			for(int x=0; x<width; x++)
			{
				g.setClip(x, y, 1, 1);
				int dx = x * sourceWidth / width;
				int dy = y * sourceHeight / height;
				g.drawImage(image, x-dx, y-dy, Graphics.LEFT | Graphics.TOP);
			}
		}
		
		return Image.createImage(newImage);
	}
to java image size scale j2me by whitetiger on Jan 08, 2007

Java - Float Approximate

// Float approximate

float a = 10F;
float b = 3F;
float c = a/b;
	
NumberFormat nf = NumberFormat.getInstance();

System.out.println(nf.format(c));
to java float approximate NumberFormat by whitetiger on Nov 28, 2006

Java - Erode

// JAI Filter erode

public RenderedImage erode(BufferedImage img)
	{
		KernelJAI kernel = new KernelJAI(7, 7, new float[]{
															0, 0, 0, 0, 0, 0, 0,
															0, 1, 1, 1, 1, 1, 0,
															0, 1, 1, 1, 1, 1, 0,
															0, 1, 1, 1, 1, 1, 0,
															0, 1, 1, 1, 1, 1, 0,
															0, 1, 1, 1, 1, 1, 0,
															0, 0, 0, 0, 0, 0, 0
															});
		ParameterBlock pb = new ParameterBlock();
		pb.addSource(img);
		pb.add(kernel);
		
		return JAI.create("erode", pb);
	}
to java images image RGB filter jpg j2me gray JAI by whitetiger on Nov 05, 2006
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