最近了解到的需求是需要需激光打刻机进行（RS232）串口通信，这里使用的是RXTX开源包实现的。
之前并没有用java做过串口通信，而且这方面资料不是很多。
项目实际应用中可能会采用VB开发
只不过用java尝试一下，记个笔记，希望可以对相关开发用些帮助。
下面是实现代码
Java代码
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; // 从串口来的输入流
OutputStream outputStream;// 向串口输出的流
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) {// 判断如果端口类型是串口
if (temp.getName().equals(name)) { // 判断如果端口已经启动就连接
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); // 给当前串口天加一个监听器
} catch (TooManyListenersException e) {
}
serialPort.notifyOnDataAvailable(true); // 当有数据时通知
try {
serialPort.setSerialPortParams(2400, SerialPort.DATABITS_8, // 设置串口读写参数
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:// 当有可用数据时读取数据,并且给串口返回数据
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();
}
}
}
测试
Java代码
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(); //得到当前连接上的端口
CommUtil comm3 = new CommUtil(portList,"COM3");
int i = 0;
while(i<5)
{
Thread.sleep(3000);
comm3.send("hello");
i++;
}
comm3.ClosePort();
}
}
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