Java İle Cep Telefonları İcin Chat Örneği

Java ile cep telefonları için chat örneği
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.util.*;
import java.io.*;
public class ChatMIDlet extends javax.microedition.midlet.MIDlet{
ChatForm form;
public void startApp(){
NickForm nickForm=new NickForm(this,"Chat Form");
Display.getDisplay(this).setCurrent(nickForm);
}
public void pauseApp(){}
public void destroyApp(boolean unconditional){}
public void setNick(String nick){
ChatForm form=new ChatForm("Chat Form",nick);
Display.getDisplay(this).setCurrent(form);
}
}
class ChatForm extends Form implements CommandListener{
String url="http://localhost:8080/examples/midlet_test/MultiMessagesServer.jsp";
Command sendCommand=new Command("Send",Command.SCREEN,2);
Command getCommand=new Command("Get",Command.SCREEN,1);
TextField messageField;
MessagesBox messagesBox;
String nick="";
public ChatForm(String title,String nick){
super(title);
this.nick=nick;
messagesBox=new MessagesBox("","");
messageField=new TextField("","",100,TextField.ANY);
append(messageField);
append(messagesBox);
addCommand(sendCommand);
addCommand(getCommand);
setCommandListener(this);
}
public void commandAction(Command c, Displayable d){
if(c==sendCommand){
try{
String s=messageField.getString();
if(s!=null){
String result=send(s);
messagesBox.append(nick+">"+s);
messageField.setString("");
}else{
messagesBox.append("String null");
}
}catch(Exception e){
messagesBox.append("Exception"+e.getMessage());
}
}else if(c==getCommand){
try{
String s=get();
if(s!=null){
messagesBox.append(s.trim());
}else{
messagesBox.append("String null");
}
}catch(Exception e){
messagesBox.append("Exception"+e.getMessage());
}
}
}
private String send(String message) throws Exception{
HttpConnection connecton=(HttpConnection)Connector.open(url+"?mes sage="+message+"&nick="+nick+"&req=SEND");
InputStream is=connecton.openInputStream();
StringBuffer buffer=new StringBuffer();
int ch;
while ((ch=is.read())!=-1) {
buffer.append((char)ch);
}
is.close();
connecton.close();
return buffer.toString();
}
private String get() throws Exception{
StringBuffer sb=new StringBuffer();
InputStream is=Connector.openInputStream(url+"?req=GET");
int ch;
while((ch = is.read())!=-1) {
sb.append((char) ch);
}
return sb.toString();
}
}
class MessagesBox extends StringItem{
Vector messages=new Vector();
public MessagesBox(String label, String text){
super(label,text);
}
public void append(String message){
messages.addElement(message);
refresh();
}
public void refresh(){
StringBuffer buffer=new StringBuffer();
for(int i=(messages.size()-1);i>-1;i--){
String message=(String)messages.elementAt(i);
buffer.append(message+"\n");
}
setText(buffer.toString());
}
}
class NickForm extends Form implements CommandListener{
Command okCommand=new Command("Ok",Command.SCREEN,1);
TextField field;
ChatMIDlet midlet;
public NickForm(ChatMIDlet midlet,String title){
super(title);
this.midlet=midlet;
field=new TextField("Nick:","",100,TextField.ANY);
append(field);
addCommand(okCommand);
setCommandListener(this);
}
public void commandAction(Command c, Displayable d){
if(c==okCommand){
String nick=field.getString();
midlet.setNick(nick);
}
}
}