串口问题

Question

做串口发送和接受数据是遇到了问题，希望各位前辈帮忙
代码片断
 public void serialEvent(SerialPortEvent event)//实现串口监听中的方法
    {
        switch(event.getEventType())
        {
            case SerialPortEvent.BI:
            case SerialPortEvent.OE:
            case SerialPortEvent.FE:
            case SerialPortEvent.PE:
            case SerialPortEvent.CD:
            case SerialPortEvent.CTS:
            case SerialPortEvent.DSR:
            case SerialPortEvent.RI:
            case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
                break;
            case SerialPortEvent.DATA_AVAILABLE:     
                byte[] readBuffer=new byte[1];
                System.out.println("为什么只执行一遍？");
                try 
                { 
                     while(inputStream.available()!=-1)
                     {  
                        int numBytes=inputStream.read(readBuffer);  
                        area.append(new String(readBuffer));  
                     } 
                     System.out.println("为什么不执行这一句呢？");
                }
                catch(Exception e){}     
            break;
        }
     } 

Answer 1

byte[] readBuffer=new byte[1];//读串口数据,每次读的数据大小
while(inputStream.available()!=-1)//开始不停的接受设备上发过来的数据

Answer 2

一直在while循环里面呢 因为一直有数据过来

Answer 3

不行啊，如果每次读的数据太大，数据长度不够时，就会加空格
while循环就是完了它也不执行后面的代码

Answer 4

看看我的，这个串口接收以TAB开头，ENTER结尾的字符，由于buffer小了接收不完，所以buffer要大，但又会加入空的东西，也就是加上ascii为０的东西，所以要去掉这些东西，你看看改一下下面的
   public void readData()
    {
        readBuffer = new byte[50];
        try
        {
            while (in.available() > 0)
            {
                in.read(readBuffer);                            }
            if (!enter)
            {
                deleteControlChar(readBuffer);
                enter = false;
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }    /**
     * @param readBuffer
     * @return void
     */
    private void deleteControlChar(byte[] readBuffer)
    {
        String buff = new String(readBuffer);
        //boolean tab = false;
        Calendar cal = Calendar.getInstance();
        String time = cal.get(Calendar.HOUR_OF_DAY) + ":"
                + cal.get(Calendar.MINUTE) + ":" + cal.get(Calendar.SECOND);        for (int i = 0; i < buff.length(); i++)
        {
            /*System.out.println("letter: " + buff.charAt(i) + " -> "
             + (int) buff.charAt(i));
             System.out.print("tab: ");
             System.out.println(tab == true);
             System.out.print("enter: ");
             System.out.println(enter == true);*/
            if ((int) buff.charAt(i) == 9 && !enter)
            {
                tab = true;
            }            if (tab && (int) buff.charAt(i) != 0 && (int) buff.charAt(i) != 9)
            {
                if ((int) buff.charAt(i) == 13)
                {
                    tab = false;
                    enter = true;
                    rev = strBuff.toString();
                    String revCS = owner.getCheckSum(rev.substring(0, rev
                            .length() - 1));
                    if (!rev.equals("000X123456789"))
                    {
                        if (revCS.equals(rev))
                        {
                            received++;
                            //System.out.println("received=" + received);
                            System.out.println(time + " received: " + rev);                            setReceived();
                            checkType(rev);
                        }
                        else
                        {
                            System.out.println(time + " received: " + rev);
                            System.out.println("but received should be: "
                                    + revCS);
                            //send also
                            /*received++;
                             setReceived();
                             checkType(rev);*/
                        }
                    }
                    else
                    {
                        System.out.println(time + " received: " + rev);
                    }                    strBuff.delete(0, strBuff.length());
                    break;
                }
                strBuff.append(buff.charAt(i));
            }
        }
    }