Introduction to the RXTX serial and parallel I/O Libraares in the Java class library
RXTX serial and parallel I/O libraries are an important part of the Java class library.It provides the function of input and output operations for serial and parallel devices.These devices include serial port, mouth, Bluetooth adapter, etc.
The RXTX library is a bridge between Java platform applications and local devices.It is based on the improved version of Java Communications API (Javax.comm) and provides more functions and improved performance.The RXTX library uses local code to achieve communication with serial and parallel devices, providing developers with a simple and flexible method to access these devices.
Below is a sample code that uses the RXTX library for serial communication:
import gnu.io.*;
public class SerialCommunicationExample implements SerialPortEventListener {
private SerialPort serialPort;
public static void main(String[] args) {
String portName = "/dev/ttyUSB0";
int baudRate = 9600;
try {
SerialPort serialPort = (SerialPort) CommPortIdentifier.getPortIdentifier(portName).open("SerialCommunicationExample", 2000);
serialPort.setSerialPortParams(baudRate, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
serialPort.addEventListener(new SerialCommunicationExample());
serialPort.notifyOnDataAvailable(true);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void serialEvent(SerialPortEvent event) {
if (event.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
try {
String inputLine = "";
if (serialPort != null) {
byte[] buffer = new byte[1024];
int len = serialPort.getInputStream().read(buffer);
inputLine = new String(buffer, 0, len);
}
System.out.println("Received data: " + inputLine);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
The above code communicates by opening the specified serial port (such as/dev/ttyusb0).In the implementation of the SerialPorteventristener, through the monitoring serial incident, we can process it accordingly when the data arrives.After receiving the data, we can convert it to string and perform subsequent processing.
The RXTX library also provides many other functions, such as setting serial parameters, sending data, etc.When using the RXTX library, you can use these features according to your needs.
In short, RXTX serial and parallel I/O libraries are very useful tools in Java development.It allows developers to easily communicate with serial and parallel equipment, and provide flexible interfaces to meet various needs.Whether it is developing serial communication applications or interaction with Bluetooth device, the RXTX library is a powerful and reliable choice.
