如何实现java链接串口
时间: 2024-01-16 07:05:13 浏览: 24
在Java中,可以通过使用Java Comm API来实现与串口的通信。下面是一个简单的Java代码示例,演示如何连接到串口:
```java
import java.io.*;
import java.util.*;
import javax.comm.*;
public class SerialTest implements SerialPortEventListener {
static CommPortIdentifier portId;
static Enumeration portList;
InputStream inputStream;
SerialPort serialPort;
Thread readThread;
public static void main(String[] args) {
portList = CommPortIdentifier.getPortIdentifiers();
while (portList.hasMoreElements()) {
portId = (CommPortIdentifier) portList.nextElement();
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
if (portId.getName().equals("COM1")) {
SerialTest reader = new SerialTest();
}
}
}
}
public SerialTest() {
try {
serialPort = (SerialPort) portId.open("SerialTestApp", 2000);
} catch (PortInUseException e) {
System.out.println("Port in use: " + e);
}
try {
inputStream = serialPort.getInputStream();
} catch (IOException e) {
System.out.println("IO Exception: " + e);
}
try {
serialPort.addEventListener(this);
} catch (TooManyListenersException e) {
System.out.println("Too many listeners: " + e);
}
serialPort.notifyOnDataAvailable(true);
try {
serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
} catch (UnsupportedCommOperationException e) {
System.out.println("Unsupported serial operation: " + e);
}
readThread = new Thread(this);
readThread.start();
}
public void run() {
try {
Thread.sleep(20000);
} catch (InterruptedException e) {
System.out.println("Interrupted: " + 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:
byte[] readBuffer = new byte[20];
try {
while (inputStream.available() > 0) {
int numBytes = inputStream.read(readBuffer);
}
System.out.print(new String(readBuffer));
} catch (IOException e) {
System.out.println("IO Exception: " + e);
}
break;
}
}
}
```
上面的代码示例中,首先,我们使用CommPortIdentifier来获取可用的串口列表。然后,我们打开指定的串口,并设置串口参数,例如波特率、数据位、停止位、校验位等。最后,我们使用InputStream读取串口接收到的数据,并在控制台上输出。在这个示例中,我们使用了一个SerialPortEventListener来监听串口事件,例如数据可用事件。这是一个非常简单的示例,可以帮助你入门串口通信的Java编程。