Proxy en java

public class PServer {
    final static int localport = 8080;
    
    
    public static void main(String[] args) throws IOException {
        
        ServerSocket serveur = null;
        try{
            serveur = new ServerSocket(localport);
            System.out.println("Serveur proxy démarré sur le port " + localport);
            // Ecoute infinie des requêtes des clients
            while(true){
                Socket client = serveur.accept();
                Clients c = new Clients(client);
            }
        }
        catch (Exception e){System.err.println(e);}
        finally{
            try{
                if (serveur != null) serveur.close();
            }
            catch (Exception e){System.err.println(e);}
        }
    }
    
} // ! PServ class

class Clients extends Thread {
    private Socket client;
    private String url;
    private URL Url;
    private InputStream sin;
    private OutputStream sout;
    
    public Clients(Socket client){
        try{
            this.client = client;
            start();
        }
        catch (Exception e){System.err.println(e);}
    } // !constructeur
    
    public void run(){
        try{
            sin = client.getInputStream();
            BufferedReader from_client = new BufferedReader(new InputStreamReader(sin));
            sout = client.getOutputStream();
            byte [] buffer = new byte[4096];
            int lus;
            
            String tmp;
	    String requete = "";
            int position;
            boolean fini = false;
            int cpt = 0;
	    
            // Lecture de l'url que le client demande
            while (((tmp = from_client.readLine()) != null) && !fini){
	    	System.out.println(tmp);
		//System.out.println((tmp != null) && !fini);
		
		//System.out.println("ICI" + tmp.trim().toUpperCase());
                if (tmp.trim().toUpperCase().startsWith("GET")) {
                    position = tmp.trim().toUpperCase().lastIndexOf("HTTP") > 0 ? tmp.toUpperCase().lastIndexOf("HTTP") : tmp.length();
                    url = tmp.trim().substring(3,position).trim();
		    requete = requete + tmp;
		    //System.out.println("URL :" + url);
                    //fini = true;
                }
		
		// il faut recuperer le User-Agent et le Host
		String regex = "^User-Agent: +(.*\\))$";
		Pattern p = Pattern.compile(regex);
		Matcher m = p.matcher(tmp);
		
		while (m.find()){
			requete = requete + m.group(0);
			/*for (int i=0; i <= m.groupCount(); i++){
			System.out.println("Groupe " + i + " : " + m.group(i));
			}*/
		}
		
		String regex2 = "^Host: +(.*)";
		Pattern p2 = Pattern.compile(regex2);
		Matcher m2 = p2.matcher(tmp);
		
		while (m2.find()){
			requete = requete + m2.group(0);
			/*for (int i=0; i <= m2.groupCount(); i++){
			System.out.println("Groupe " + i + " : " + m2.group(i));
			}*/
		}
		
		cpt++;
		//System.out.println(cpt);
		if (cpt >= 5) {
			fini = true;
			//System.out.println("fini" + fini);
			//System.out.println("URL ?" + url);
			}
		//System.out.println("URL ? " + url);
		//System.out.println("la requete envoyée au serveur : " + requete);
            }
            
            // création d'une connexion sur le serveur http cible
            System.out.println("Url demandée : " + url);
	    
	    //appel à la classe proxyClient
	    proxyClient p = new proxyClient(client, requete, url);
	    
	    
            /*URL Url = new URL(url);
            InputStream httpin = Url.openStream();
            
            while( (lus = httpin.read(buffer)) != -1) sout.write(buffer,0,lus);
            httpin.close();
            client.close();*/
        }
        catch (Exception e){System.err.println(e);}
    } // ! run() method
} // ! Clients class


class proxyClient extends Thread {

private Socket client;
private String requete;
private String url;
public static int port = 8080;
public static String  host = "localhost";



	public proxyClient(Socket client, String requete, String url){
        	try{
            		this.client = client;
			this.requete = requete;
			this.url = url;
            		start();
        	}
        	catch (Exception e){System.err.println(e);}
    	} // !constructeur
	
	public void run(){
	String tmp = "";
	int position;
	int count=-1;
	 
        try { 
		/*URL Url = new URL(url);
            	InputStream httpin = Url.openStream();
            
            	while( (lus = httpin.read(buffer)) != -1) sout.write(buffer,0,lus);
            	httpin.close();*/
		Socket socket = new Socket(InetAddress.getByName(host),port);
		System.out.println("socket créé");
		
		
		
		socket.close();
		client.close();
		
	}
        catch (Exception e){System.err.println(e);}
	
    } // ! run() method

} // ! proxyClient class