Guide to use RXTX serial and parallel I/O libraries in the Java class library
Guide to use RXTX serial and parallel I/O libraries in the Java class library
Overview:
RXTX is a serial and parallel I/O library for Java language, which can achieve cross -platform serial and parallel communication.This article will introduce how to use RXTX libraries in Java, including installation, configuration and sample code.
1. Install the RXTX library:
First of all, you need to download the RXTX library file for specific operating systems from the RXTX official website.After downloading, unzip the library file and copy the jar file and the corresponding local library file (.dll or .SO file) to the Java project in the ClassPath of the Java project.
2. Configure serial and parallel port:
Before using the RXTX library, you need to configure serial and parallel ports.You can use RXTXCOMMDRIVER for configuration, which is provided in the RXTX library.
Below is a sample code, showing how to configure serial and parallel ports:
import gnu.io.CommPortIdentifier;
public class PortConfiguration {
public static void main(String[] args) {
// Get all available serial and parallel ports
CommPortIdentifier[] portIdentifiers = CommPortIdentifier.getPortIdentifiers();
// Traversing all ports
while (portIdentifiers.hasMoreElements()) {
CommPortIdentifier portIdentifier = portIdentifiers.nextElement();
// Output serial and parallel port information
System.out.println ("port name:" + portablentifier.getName ());
System.out.println ("port type:" + portablentifier.getportype ());
}
}
}
3. Open and close the serial and parallel port:
Before opening the serial and parallel port, you need to get the corresponding port identifier.You can use the static method of the CommptIdIdifier class to get the port identifier.After opening the port, you can read and write operations by obtaining the corresponding input flow and output stream.Finally, use the Close method to close the port.
import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class PortCommunication {
public static void main(String[] args) {
String portname = "/dev/ttys0"; // serial or parallel port name
try {
// Get the identifier of the corresponding port
CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName);
// Open the port and set the reading and writing timeout time
CommPort commPort = portIdentifier.open("PortCommunication", 2000);
if (commPort instanceof SerialPort) {
SerialPort serialPort = (SerialPort) commPort;
// Configure the serial port parameters (baud rate, data bit, stop bit, verification position, etc.)
serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
// Open the input flow and output flow of the port
InputStream in = serialPort.getInputStream();
OutputStream out = serialPort.getOutputStream();
// Read and write operations on the input flow and output stream
// Turn off the port
serialPort.close();
} else {
System.out.println ("Not serial port");
}
} catch (Exception e) {
System.err.println(e.toString());
}
}
}
Note: After using the RXTX library, you must remember to close the serial and parallel ports to prevent the leakage of resource.
in conclusion:
This article introduces the basic method of using RXTX libraries in Java for basic use.First, you need to install and configure the RXTX library, and then you can use the RXTXCOMMDRIVER class to configure serial and parallel port.Finally, read and write operations by obtaining input flow and output flow.
It is hoped that this article can help readers understand how to use the RXTX library in Java for serial and parallel communication, so that in development, it can handle serial and parallel I/O operations more flexibly.
