label.setText("值");

 /**
     * 数据接收的监听处理函数
     * @return
     */  
    public void serialEvent(SerialPortEvent arg0){  
        switch(arg0.getEventType()){  
        case SerialPortEvent.BI:/*Break interrupt,通讯中断*/   
        case SerialPortEvent.OE:/*Overrun error，溢位错误*/   
        case SerialPortEvent.FE:/*Framing error，传帧错误*/  
        case SerialPortEvent.PE:/*Parity error，校验错误*/  
        case SerialPortEvent.CD:/*Carrier detect，载波检测*/  
        case SerialPortEvent.CTS:/*Clear to send，清除发送*/   
        case SerialPortEvent.DSR:/*Data set ready，数据设备就绪*/   
        case SerialPortEvent.RI:/*Ring indicator，响铃指示*/  
        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:/*Output buffer is empty，输出缓冲区清空*/   
            break;  
        case SerialPortEvent.DATA_AVAILABLE:/*Data available at the serial port，端口有可用数据。读到缓冲数组，输出到终端*/  
            byte[] readBuffer = new byte[1024];  
            String readStr="";  
            String s2 = "";  
            try {  
                while (inputStream.available() > 0) {  
                    inputStream.read(readBuffer);  
                    readStr += new String(readBuffer).trim();  
                }  
                log("接收到端口返回数据(长度为"+readStr.length()+")："+readStr);  
            } catch (IOException e) {  
                throw new RuntimeException(e.getMessage());  
            } 

弄了半天还是弄不好

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