eclipse - Connect to serial port in Java using RXTX -

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i'm using eclipse communicate arduino, through arduino platform. can open port using eclipse or arduino, can't connect opened port using eclipse. send integers using eclipse through arduino platform, , received arduino. how can connect eclipse arduino's serial port?

this actual code (i found in utilisation des ports com en java avec rxtx [résolu] (is in french)):

import gnu.io.unsupportedcommoperationexception;  import java.io.ioexception; import java.util.scanner; public class testserialport {      public static void main(string[] args) {         scanner sc = new scanner(system.in);         system.out.println("le port est-il ouvert? ");         string str = sc.nextline();         system.out.println("vous avez saisi : " + str);         string s1 = "non";          if ( s1.equals(str))         {             final rs232 serial = new rs232();             system.out.println("-   ouverture du port   -");             serial.setport("com3");             serial.setvitesse(4800);             serial.setnbbits(8);             serial.setparite("aucune");             serial.setstop("1");             serial.setcontrole("matériel");              serial.ouvrirport();             system.out.println("-   envoie de l'information   -");             serial.ecrireint(9);             system.out.println(" le recu " + serial.getcrecu());              serial.effacercrecu();             serial.fermerport();         }         else         {          }     } }  import gnu.io.*; import java.io.*; import java.util.logging.level; import java.util.logging.logger;  public class rs232 {     private outputstream outstream; //flux d'écriture du port     private inputstream in; //flux de lecture du port     private commportidentifier portid; //identifiant du port     private rxtxport sport; //le port série     private string s; //string de retour d'info     private int vitesse = 4800;     private int nbbits = serialport.databits_8;     private string nomport = "com3";     private int parite = serialport.parity_none;     private int stop = serialport.stopbits_1;     private int controle = serialport.flowcontrol_none;     private rxtxcommdriver w32driver = new rxtxcommdriver();     private ecouteport ecouteport1;     private bufferedreader bufread;      public rs232(){      }      //recupération du nom du port     public string setport(string port){         nomport = port;         s = "";         try {             portid = commportidentifier.getportidentifier(nomport);             s = "port ok";         }         catch (nosuchportexception e) {             s = "port innexistant";         }         return s;     }      //renvoi du nom du port     public string getport(){         return portid.tostring();     }      //recuperation de la vitesse de transmission     public void setvitesse(int v){         vitesse = v;     }      //retour de la vitesse de transmission     public int getvitesse(){         return vitesse;     }      //recupertion du nombre de bits de donées     public string setnbbits(int b){         s = "";         if (b == 5){             nbbits = rxtxport.databits_5;             s = "5 bits de donnée";         }         else if (b == 6){             nbbits = rxtxport.databits_6;             s = "6 bits de donnée";         }         else if (b == 7){             nbbits = rxtxport.databits_7;             s = "7 bist de donnée";         }         else if (b == 8){             nbbits = rxtxport.databits_8;             s = "8 bits de donnée";         }         else {             s = "nombre de bits de donnée incompatible";         }         // system.out.println(s);         return s;     }      //retour du nombre de bits de données     public int getnbbits(){         int b = 0;         if ( nbbits == rxtxport.databits_5){             b = 5;         }         else if (nbbits == rxtxport.databits_6){             b = 6;         }         else if ( nbbits == rxtxport.databits_7){             b = 7;         }         else if ( nbbits == rxtxport.databits_8){             b = 8 ;         }         return b;     }      //recuperation de la parite     public string setparite(string parite){         s = "";         if (parite.equals("aucune")){             parite = rxtxport.parity_none;             s = "pas de parité";         }         else if (parite.equals("paire")){             parite = rxtxport.parity_even;             s = "parité paire";         }         else if (parite.equals("impaire")){             parite = rxtxport.parity_odd;             s = "parité impaire";         }         else if (parite.equals("marque")){             parite = rxtxport.parity_mark;             s = "parité marquée";         }         else if (parite.equals("espace")){             parite = rxtxport.parity_space;             s = "parité espace";         }         else {             s = "parité inconnue";         }         // system.out.println(s);         return s;     }      //retour de la parite     public string getparite(){         s = "";         if (parite == rxtxport.parity_none){             s = "aucune";         }         else if (parite == rxtxport.parity_even){             s = "paire";         }         else if (parite == rxtxport.parity_odd){             s = "impaire";         }         else if (parite == rxtxport.parity_mark){             s = "marque";         }         else if (parite == rxtxport.parity_space){             s = "espace";         }         return s;     }      //recuperation du nombre de bits de stop     public string setstop(string stop){         s = "";         if (stop.equals("1")){             stop = rxtxport.stopbits_1;             s = "1 bit de stop";         }         else if (stop.equals("2")){             stop = rxtxport.stopbits_2;             s = "2 bits de stop";         }         else if (stop.equals("1,5")){             stop = rxtxport.stopbits_1_5;             s = "bit de stop 1,5";         }         else {             s = "bit de stop inconnu";         }         // system.out.println(s);         return s;     }      //retour du nombre de bits de stop     public string getstop(){         s = "";         if (stop == rxtxport.stopbits_1){             s = "1";         }         else if (stop == rxtxport.stopbits_2){             s = "2";         }         else if (stop == rxtxport.stopbits_1_5){             s = "1,5";         }         return s;     }      //recuperation du controle     public void setcontrole(string controle){         if (controle.equals("matériel")){             controle = serialport.flowcontrol_rtscts_in;         }         else if (controle.equals("xon/xoff")){             controle = serialport.flowcontrol_xonxoff_in;         }         else {             controle = serialport.flowcontrol_none;         }     }      //retour du controle     public string getcontrole(){         string c = null;         if (controle == serialport.flowcontrol_none){             c = "aucun";         }         if (controle == serialport.flowcontrol_rtscts_in){             c = "matériel";         }         if (controle == serialport.flowcontrol_xonxoff_in){             c = "xon/xoff";         }         return c;     }      //ouvrir le port et les flux     public void ouvrirport(){         w32driver.initialize();         //ouverture du port         try {             sport = (rxtxport) portid.open("java_rs232", 2000);         }         catch (portinuseexception e) {             system.err.println(e);         }          if (sport != null) {             //règle les paramètres de la connexion             try {                 sport.setflowcontrolmode(controle);                 sport.setserialportparams(vitesse,                                           nbbits,                                           stop,                                           parite);                  //récupération du flux de lecture et écriture du port                 outstream = sport.getoutputstream();                 in = sport.getinputstream();                 bufread = new bufferedreader(new inputstreamreader(sport.getinputstream()));                 ecouteport1 = new ecouteport(in);                  (new thread(ecouteport1)).start();             }             catch (unsupportedcommoperationexception e) {               system.err.println(e);             }         }     }      // retour de la chaine recu     public string getcrecu(){         string c = "";         if (sport != null) {             c = ecouteport1.recu();         }         return c;     }      //effacer la chaine recu     public void effacercrecu(){         if (sport != null) {             ecouteport1.effacerrecu();         }     }      // ecrire un caractere     public void ecrirechar(char envoie){         if (sport != null) {             try {                 //demande de poids                 outstream.write((int) envoie);                 outstream.close();             }             catch (ioexception e) {             }         }     }      //ecrire un tablea de bytes     public boolean ecrirebytes(byte[] envoie){         boolean b = false;          if (sport != null) {             try {                 outstream.write(envoie);                 outstream.close();                 b = true;             }             catch (ioexception e) {                 system.err.println(e);             }         }         return b;     }      public boolean ecrireint(int envoie){         boolean b = false;          if (sport != null) {             try {                 outstream.write(envoie);                 outstream.close();                 b = true;             }             catch (ioexception e) {                 system.err.println(e);             }         }         return b;     }      //fermer le port     public void fermerport(){         if (sport != null) {         try {             outstream.close();         }         catch (ioexception e) {             system.err.println(e);         }          ecouteport1.stopthread();             sport.close();         }     } }   //thread d'ecoutedu port  class ecouteport implements runnable{     private boolean running = true;     private inputstream in;     private string caractrecu;     private string srecu = new string();      public ecouteport(inputstream in){         this.in = in;     }      @override     public void run(){         while (running){             byte[] buffer = new byte[1024];             int len = -1;             try             {                 while ( ( len = this.in.read(buffer)) > -1 )                 {                     caractrecu = new string(buffer,0,len);                     srecu = srecu.concat(caractrecu);                     //byte[]  retourtrame = caractrecu.getbytes();                     //for (int t = 0;t<retourtrame.length;t++){                     //  system.out.println((int)retourtrame[t]& 0xff);                     //}                     try {                         // pause                         thread.sleep(100);                     }                     catch (interruptedexception ex) {}                  }              }              catch ( ioexception e )              {                  e.printstacktrace();              }          }      }       //arrette le thread      public void stopthread(){          this.running = false;      }       //eface les caractere recu      public void effacerrecu(){          srecu = "";      }       //renvoi les caractere recu      public string recu(){          return srecu;      }  }


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