您不想专门编写示例代码中已经存在的读取函数，如TheMerovingian指出的，您可以在读取之前检查输入Buffer，这是我在一个项目中使用的工作代码。
import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.OutputStream;import gnu.io.CommPortIdentifier; import gnu.io.SerialPort;import gnu.io.SerialPortEvent; import gnu.io.SerialPortEventListener; import java.util.Enumeration;public class SerialTest implements SerialPortEventListener {SerialPort serialPort; private static final String PORT_NAMES[] = { "/dev/tty.usbserial-A9007UX1", // Mac OS X "/dev/ttyUSB0", // Linux "COM35", // Windows};private BufferedReader input;private OutputStream output;private static final int TIME_OUT = 2000;private static final int DATA_RATE = 9600;public void initialize() { CommPortIdentifier portId = null; Enumeration portEnum = CommPortIdentifier.getPortIdentifiers(); //First, Find an instance of serial port as set in PORT_NAMES. while (portEnum.hasMoreElements()) { CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement(); for (String portName : PORT_NAMES) { if (currPortId.getName().equals(portName)) { portId = currPortId; break; } } } if (portId == null) { System.out.println("Could not find COM port."); return; } try { serialPort = (SerialPort) portId.open(this.getClass().getName(), TIME_OUT); serialPort.setSerialPortParams(DATA_RATE, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); // open the streams input = new BufferedReader(new InputStreamReader(serialPort.getInputStream())); output = serialPort.getOutputStream(); serialPort.addEventListener(this); serialPort.notifyonDataAvailable(true); } catch (Exception e) { System.err.println(e.toString()); }}public synchronized void close() { if (serialPort != null) { serialPort.removeEventListener(); serialPort.close(); }}public synchronized void serialEvent(SerialPortEvent oEvent) { if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) { try { String inputLine=null; if (input.ready()) { inputLine = input.readLine(); System.out.println(inputLine); } } catch (Exception e) { System.err.println(e.toString()); } } // Ignore all the other eventTypes, but you should consider the other ones.}public static void main(String[] args) throws Exception { SerialTest main = new SerialTest(); main.initialize(); Thread t=new Thread() { public void run() { //the following line will keep this app alive for 1000 seconds, //waiting for events to occur and responding to them (printing incoming messages to console). try {Thread.sleep(1000000);} catch (InterruptedException ie) {} } }; t.start(); System.out.println("Started");}}编辑：serialEvent函数负责读取缓冲区。
public synchronized void serialEvent(SerialPortEvent oEvent) { if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) { try { String inputLine=null; if (input.ready()) { inputLine = input.readLine(); System.out.println(inputLine); } } catch (Exception e) { System.err.println(e.toString()); } }// Ignore all the other eventTypes, but you should consider the other ones.}
