关于java串口通信的问题

Question

java 发送数据,另一端,有时会正常接收到  有时只会接收前8个字符,,经常数据接收不完整,请问这是怎么回事啊

Answer 1

 
 发送数据 public void WritePortData(byte [] aa){

try{

outputStream = serialPort.getOutputStream(); 
outputStream.write(aa);
outputStream.flush(); }catch(Exception ee){


return ;

}


}

串口连接:public void connectPort() {



if (this.serialPort != null) {
this.serialPort.close();
}
try {
portId = CommPortIdentifier.getPortIdentifier(this.portName);
serialPort = (SerialPort) portId.open("ReadComm", 2000);
this.p3f2.setText(this.portName + " Success\n"); } catch (Exception ee) { JOptionPane.showMessageDialog(this, ee.toString(), "Message",
JOptionPane.INFORMATION_MESSAGE);
this.p3f2.setText(this.portName + " failure\n");
}
try {
serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); } catch (Exception ee) { JOptionPane.showMessageDialog(this,
"Please connect serial port first!", "Message",
JOptionPane.INFORMATION_MESSAGE);
}
try { this.inputStream = serialPort.getInputStream();
this.serialPort.addEventListener(this); } catch (Exception ee) {}
serialPort.notifyOnDataAvailable(true);
}
接收数据代码:
public void serialEvent(SerialPortEvent event) { 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[21];        
             try{                      
              while(inputStream.available()>0){              
                     int numBytes=inputStream.read(readBuffer);                                
              }              
           
              String comStr = new String(readBuffer).trim();                      
              
              }
} catch (Exception e) { }
break;
}
}