socket

   private Socket soc = null;             // Client socket.
   private DataOutputStream out = null;   // Data writer (send to Server).
   private DataInputStream in = null;     // Data reader (received from Server). 
　　　：
      this.soc = new Socket(this.machine.ipadres,port);
      this.out = new DataOutputStream(this.soc.getOutputStream());
      this.in = new DataInputStream(this.soc.getInputStream());
　　　：
   private void loginLoop(Machine machine) throws IOException{
      StringBuffer sb = new StringBuffer();
      int c0;
      while(true){
         c0 = this.in.readUnsignedByte();
         if (c0 == 255){      // IAC ?
            recvIAC(c0);      // IAC送受信
         }else{    // Normal charaters. Dump onto tty.
            sb.append((char)c0);
            if (machine.loginprompt.length()>0){
               if (sb.toString().endsWith(machine.loginprompt)){
                  this.out.writeBytes(machine.loginID+"\r\n");
                  this.out.flush();
               }
            }
            if (sb.toString().endsWith(machine.passwdprompt)){
               this.out.writeBytes(machine.password+"\r\n");
               this.out.flush();
               break;
            }
            if(sb.toString().endsWith(machine.prompt)){
               break;       // 既にログイン済みなら次へ
            }   
         }
      }      
   }

   /** 
    * IAC受信
    */
   private void recvIAC(int c0) throws IOException {
      int c1,c2,c3=0;
      c1 = c0;
      c1 = this.in.readUnsignedByte ();
      if (c1 >= 251 && c1 <= 254) {  // WILL / DO
         c2 = in.readUnsignedByte();
         switch(c1){
            case 251: // WILL
            case 252: // WON'T
                    c3 = 254;  // DON'T
                 break;
            case 253: // DO
            case 254:
                    c3 = 252;  // WON'T
                 break;
         }
         this.out.write(255);   // IAC
         this.out.write(c3);    // DON'T/WON'T
         this.out.write(c2);    // option
         this.out.flush();
      }
   }