CommPortIdentifier.getPortIdentifier（portname）通過異常

在代碼中：CommPortIdentifier.getPortIdentifier（portname）無法識別ComPort。CommPortIdentifier.getPortIdentifier（portname）通過異常

{CommPortIdentifier cpi = null; 
    try { 
     cpi = CommPortIdentifier.getPortIdentifier(portname); 
     if (cpi.isCurrentlyOwned()) { 

    System.out.println("Error: Port is currently in use"); 
} 
     com = (SerialPort) cpi.open("COM", 10); 
     com.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); 
    } catch (Exception e1) { 
     e1.printStackTrace(); 
     return false; 
    }}

我試圖在鏈接how-to-install-java-communications 的解決方案，但失敗了，請幫我有關。

來源

2017-08-09 Harish Chaudhary