TP 2 : Application SnapTchat 20 février 2015
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1 TP 2 : Application SnapTchat 20 février 2015 SnapTchat : cahier de charges L objectif de ce TP est de développer une simple application d échange de messages courts entre deux utilisateurs. Le cahier des charges de l application souhaitée stipule les besoins suivants : 1. L application permet l échange de messages entre deux utilisateurs. 2. L application offre une interface graphique pour la saisi des messages à envoyer et pour l affiche des messages reçus et envoyés. 3. L échange de message s appuie sur le protocole UDP. 4. Chaque message affiché s efface automatiquement au bout d un temps court (ex. 10 secondes). Travail demandé 1. Proposer une architecture logicielle générique de l application Snapchat. 2. Fournie une implémentation en Java de l architecture proposée. 3. Proposer une extension de l application afin de supporter l échange de messages entre un groupes d utilisateurs. Corrigé interface ClientServeur import java.io.*; public interface ClientServeur { /** on sait à qui on parle : adresse IP (ou nom de machine) et port distants sont connus **/ public void envoyermessage(string message) throws IOException; public String recevoirmessage() throws IOException; 1
2 class ClientServeurUDP import java.net.*; import java.io.*; public abstract class ClientServeurUDP implements ClientServeur { protected DatagramSocket socket; protected InetAddress adresseipdistante; protected int portdistant; public void envoyermessage(string message) throws IOException {// construction du paquet surdimensionné DatagramPacket packet = new DatagramPacket(message.getBytes(),message.length socket.send(packet); // méthode recevoirmessage du serveur public String recevoirmessage()throws IOException { byte buffer[]=new byte[16000]; DatagramPacket packet = new DatagramPacket(buffer,buffer.length);// préparat socket.receive(packet); this.portdistant=packet.getport(); this.adresseipdistante=packet.getaddress(); return(new String(packet.getData()).trim()); //fin de la classe ClientServeurUDP class TableTemp import java.util.*; public class TableTemp extends Observable { private static int mid; /* messge id*/ private Hashtable<Integer,String> tab_m; // table des messges private Hashtable<Integer,STTimer> tab_t; // table de temporisateurs private int timeout; /* duree du temporisateurs */ public TableTemp(int timeout) throws Exception { if (timeout > 1000){ // au moins une second 2
3 this.timeout=timeout; this.tab_m = new Hashtable<Integer,String>(); this.tab_t= new Hashtable<Integer,STTimer>(); public synchronized String gettext(){ // retourner un String formatté content les messges dans tab_m String msg = new String(); for (Enumeration e=this.tab_m.keys() ; e.hasmoreelements();){ msg=msg+this.tab_m.get(e.nextelement())+"\n"; System.out.println("getText : "+msg); return msg; public synchronized void addmessge(string m){ this.mid++; this.tab_m.put(this.mid,m); this.tab_t.put(this.mid,new STTimer(this.timeout,this.mid,this)); this.tab_t.get(this.mid).start(); this.setchanged(); // marquer le changement this.notifyobservers(this.gettext()); public synchronized void removemessge(int mid) throws Exception { this.tab_m.remove(mid); this.setchanged(); // marquer le changement this.notifyobservers(this.gettext()); class STTimer import java.util.*; class STTimer extends Thread { private TableTemp tab; private int timeout; private int mid; // messge id 3
4 public STTimer(int timeout,int mid,tabletemp tab){ this.tab= tab; this.timeout=timeout; this.mid=mid; public void run(){ this.sleep(this.timeout); this.tab.removemessge(mid); catch (Exception e){ class NetHandler import java.io.*; import java.net.*; public class NetHandler extends ClientServeurUDP implements Runnable { private TableTemp tab; public NetHandler(DatagramSocket soc, TableTemp tab){ this.tab=tab; this.socket=soc; public void run(){ while(true){ String str=this.recevoirmessage(); this.tab.addmessge(str); System.out.println(str); catch (Exception e){ 4
5 class STGui import java.awt.*; import javax.swing.*; public class STGui extends JPanel { protected JTextField input; protected JTextArea display; protected JButton send; public STGui() { JPanel up,down; up = new JPanel(); down= new JPanel(); this.setlayout(new BorderLayout()); this.input = new JTextField(40); this.send = new JButton("send"); this.display= new JTextArea(); up.add(this.display); down.add(this.input); down.add(this.send); this.add(up,borderlayout.north); this.add(down,borderlayout.south); public JButton getsendbutton(){ return this.send; public JTextArea getdispaly(){ return this.display; public String gettext(){ return this.input.gettext(); public void cleartextfield(){ 5
6 this.input.settext(""); public void displaymessge(string str){ this.display.settext(str); class SnapTcaht import java.util.*; import java.net.*; import java.awt.*; import javax.swing.*; import java.awt.event.*; public class SnapTchat extends ClientServeurUDP implements ActionListener, Observer { protected NetHandler nethandler; protected TableTemp tab; protected STGui gui; private int localport; public SnapTchat(int lport,inetaddress distadr, int dport) throws Exception{ if ((lport > 1024) && (dport>1024) && distadr!=null){ this.localport= lport; this.socket = new DatagramSocket(lport); this.adresseipdistante=distadr; this.portdistant=dport; this.tab= new TableTemp(5000); this.gui= new STGui(); this.gui.getsendbutton().addactionlistener(this); this.nethandler = new NetHandler(this.socket,this.tab); this.tab.addobserver(this); new Thread(this.netHandler).start(); else{ throw new Exception(); public JPanel getgui(){ return this.gui; 6
7 public void actionperformed(actionevent e){ // activation du button send String str = this.gui.gettext(); this.tab.addmessge(str); this.envoyermessage(str); this.gui.cleartextfield(); catch (Exception ex){ public void update(observable obj, Object arg){ if (obj==this.tab){ String str= (String) arg; this.gui.displaymessge(str); public static void main (String[] args){ SnapTchat s; JFrame win; s= new SnapTchat(Integer.parseInt(args[0]), InetAddress.getByName(args[1]), Integer.parseInt(args[2])); win = new JFrame("Snap Tchat"); win.setcontentpane(s.getgui()); win.setvisible(true); catch (Exception e){ 7
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