最近了解到的需求是需要需激光打刻機(jī)進(jìn)行（RS232）串口通信，
這里使用的是RXTX開(kāi)源包實(shí)現(xiàn)的。
之前并沒(méi)有用java做過(guò)串口通信，而且這方面資料不是很多。
項(xiàng)目實(shí)際應(yīng)用中可能會(huì)采用VB開(kāi)發(fā)（這個(gè)我就不會(huì)了）

只不過(guò)用java嘗試一下，記個(gè)筆記，希望可以對(duì)相關(guān)開(kāi)發(fā)用些幫助。

下面是實(shí)現(xiàn)代碼

      package test;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.Date;
import java.util.Enumeration;
import java.util.TooManyListenersException;

import gnu.io.CommPortIdentifier;
import gnu.io.PortInUseException;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import gnu.io.UnsupportedCommOperationException;

public class CommUtil implements SerialPortEventListener {

	InputStream inputStream; // 從串口來(lái)的輸入流
	OutputStream outputStream;// 向串口輸出的流
	SerialPort serialPort; // 串口的引用
	CommPortIdentifier portId;

	public CommUtil(Enumeration portList, String name) {
		while (portList.hasMoreElements()) {
			CommPortIdentifier temp = (CommPortIdentifier) portList.nextElement();
			if (temp.getPortType() == CommPortIdentifier.PORT_SERIAL) {// 判斷如果端口類型是串口
				if (temp.getName().equals(name)) { // 判斷如果端口已經(jīng)啟動(dòng)就連接
					portId = temp;
				}
			}
		}
		try {
			serialPort = (SerialPort) portId.open("My"+name, 2000);
		} catch (PortInUseException e) {

		}
		try {
			inputStream = serialPort.getInputStream();
			outputStream = serialPort.getOutputStream();
		} catch (IOException e) {
		}
		try {
			serialPort.addEventListener(this); // 給當(dāng)前串口天加一個(gè)監(jiān)聽(tīng)器
		} catch (TooManyListenersException e) {
		}
		serialPort.notifyOnDataAvailable(true); // 當(dāng)有數(shù)據(jù)時(shí)通知
		try {
			serialPort.setSerialPortParams(2400, SerialPort.DATABITS_8, // 設(shè)置串口讀寫(xiě)參數(shù)
					SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
		} catch (UnsupportedCommOperationException e) {
		}
	}

	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:// 當(dāng)有可用數(shù)據(jù)時(shí)讀取數(shù)據(jù),并且給串口返回?cái)?shù)據(jù)
			byte[] readBuffer = new byte[20];

			try {
				while (inputStream.available() > 0) {
					System.out.println(inputStream.available());
					int numBytes = inputStream.read(readBuffer);
					System.out.println(numBytes);
				}
				System.out.println(new String(readBuffer).trim());
			} catch (IOException e) {
				e.printStackTrace();
			}
			break;
		}
	}
	public void send(String content){
		try {
			outputStream.write(content.getBytes());
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public void ClosePort() {
	    if (serialPort != null) {
	      serialPort.close();
	    }
	  }

	
}


    

測(cè)試

      package test;

import gnu.io.CommPortIdentifier;

import java.util.Enumeration;

public class Test {

	public static void main(String[] args) throws InterruptedException {
		Enumeration portList = CommPortIdentifier.getPortIdentifiers(); //得到當(dāng)前連接上的端口
		
		CommUtil comm3 = new CommUtil(portList,"COM3");
		int i = 0;
		while(i<5)
		{
			Thread.sleep(3000);
			comm3.send("hello");
			i++;
		}
		comm3.ClosePort();
	}

}