Common problems and solutions for RXTX Serial and Parallel I/O Libraries
RXTX Serial and Parallel I/O Libraries is a class library that provides serial and parallel communication I/O communication for Java.It is a commonly used library, but during use, some common problems may be encountered.This article will provide some common problems and solutions, with Java code example for reference.
Question 1: How to install the RXTX library?
solution:
1. Download the installation package of the RXTX library (usually a .jar file).
2. Copy the installation package to the Java project in ClassPath.
3. Import the class or method of the RXTX library in the project.
4. Configure the construction path of the project to contain the RXTX library.
Question 2: How to find the available serial port?
Solution: You can use the following code examples to list the available serial port:
import gnu.io.CommPortIdentifier;
import java.util.Enumeration;
public class SerialPortExample {
public static void main(String[] args) {
Enumeration portList = CommPortIdentifier.getPortIdentifiers();
while (portList.hasMoreElements()) {
CommPortIdentifier portId = (CommPortIdentifier) portList.nextElement();
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
System.out.println ("available serial port:" + Portid.getName ());
}
}
}
}
Question 3: How to open and close the serial port?
Solution: You can use the following example examples to open and close the serial port:
import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import java.io.IOException;
public class SerialPortExample {
public static void main(String[] args) {
String portname = "com1"; // serial port name
int Baudrate = 9600; // Potter rate
try {
CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName);
if (portIdentifier.isCurrentlyOwned()) {
System.out.println ("The serial port has been occupied!");
} else {
CommPort commPort = portIdentifier.open("SerialPortExample", 2000);
if (commPort instanceof SerialPort) {
SerialPort serialPort = (SerialPort) commPort;
serialPort.setSerialPortParams(baudRate, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
// Perform reading and writing operations on the serial port here
serialPort.close();
} else {
System.out.println ("You can only open the serial port!"););
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
Question 4: How to read the serial port reading operation?
Solution: You can use the following code examples to perform the read operation of the serial port:
import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import java.io.InputStream;
public class SerialPortExample {
public static void main(String[] args) {
// Open the serial port first (slightly)
try {
InputStream inputStream = serialPort.getInputStream();
byte[] buffer = new byte[1024];
int len = inputStream.read(buffer);
String data = new String(buffer, 0, len);
System.out.println ("Received data:" + data);
} catch (IOException e) {
e.printStackTrace();
}
}
}
Question 5: How to write a serial port writing operation?
Solution: You can use the following example examples to perform a serial port writing operation:
import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import java.io.OutputStream;
public class SerialPortExample {
public static void main(String[] args) {
// Open the serial port first (slightly)
try {
OutputStream outputStream = serialPort.getOutputStream();
String dataToSend = "Hello, World!";
outputStream.write(dataToSend.getBytes());
outputStream.flush();
System.out.println ("Send data:" + Datatosend);
} catch (IOException e) {
e.printStackTrace();
}
}
}
It is hoped that the above common problems and solutions can help you use RXTX Serial and Parallel I/O Libraries.
