The advancement of the high -level function of RXTX serial and parallel I/O libraries in the Java class library
The advancement of the high -level function of RXTX serial and parallel I/O libraries in the Java class library
Overview:
RXTX is a powerful serial and parallel I/O library, which is used to achieve communication with serial and port in Java applications.It provides many advanced functions that facilitate developers to customize configuration, data transmission and equipment interaction.This article will introduce the advanced features implemented in the RXTX library in the Java library, and provide some Java code examples to help readers better understand these functions.
1. Open and close of the port:
The RXTX library provides a simple and flexible way to open and close the serial and parallel ports.
import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
// Open the serial port
public static SerialPort openSerialPort(String portName, int baudRate) throws Exception {
CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName);
if (portIdentifier.isCurrentlyOwned()) {
Throw New Exception ("Port has been occupied");
} else {
CommPort commPort = portIdentifier.open(this.getClass().getName(), 2000);
if (commPort instanceof SerialPort) {
SerialPort serialPort = (SerialPort) commPort;
serialPort.setSerialPortParams(baudRate, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
return serialPort;
} else {
Throw New Exception ("port type error");
}
}
}
// Turn off the serial port
public static void closeSerialPort(SerialPort serialPort) {
if (serialPort != null) {
serialPort.close();
serialPort = null;
}
}
2. Data reading and writing:
Through the RXTX library, you can easily read and write serial and parallel ports in Java.
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
// Read data from the serial port
public static byte[] readFromSerialPort(SerialPort serialPort) throws IOException {
InputStream in = serialPort.getInputStream();
byte[] buffer = new byte[1024];
int len;
while ((len = in.read(buffer)) > -1) {
// Process the data you read
// ...
}
return buffer;
}
// Write data to the serial port
public static void writeToSerialPort(SerialPort serialPort, byte[] data) throws IOException {
OutputStream out = serialPort.getOutputStream();
out.write(data);
out.flush();
}
3. Event monitoring:
The RXTX library provides event monitoring, which can detect specific events on serial and parallel ports, such as data receiving and sending.
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
// serial event monitoring device
public class SerialPortListener implements SerialPortEventListener {
@Override
public void serialEvent(SerialPortEvent event) {
switch (event.getEventType()) {
case SerialPortEvent.DATA_AVAILABLE:
// Process the received data
// ...
break;
case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
// Output buffer is empty
// ...
break;
}
}
}
// Add serial incident listener
SerialPort serialPort = openSerialPort("COM1", 9600);
serialPort.addEventListener(new SerialPortListener());
serialPort.notifyOnDataAvailable(true);
4. Custom configuration:
The RXTX library allows developers to customize parameters of configuration serial and parallel ports, such as Potter rate, data bit, stop bit, and verification.
import gnu.io.SerialPort;
// Configure serial port parameters
public static void configureSerialPort(SerialPort serialPort, int baudRate, int dataBits, int stopBits, int parity)
throws IOException {
serialPort.setSerialPortParams(baudRate, dataBits, stopBits, parity);
}
// Example: Configure the serial port parameters of 9,600 Potter, 8 data bits, 1 stop bit, no school test
SerialPort serialPort = openSerialPort("COM1", 9600);
configureSerialPort(serialPort, 9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
in conclusion:
The RXTX library is a very powerful serial and parallel I/O library that implements communication with serial and port in Java applications.It provides many advanced functions that facilitate developers to customize configuration, data transmission and equipment interaction.Through the example code introduced above, readers can better understand the advanced features achieved by the RXTX library in the Java library.
