RXTX Serial and Parallel I/O Libraries in the Java Library

Application of RXTX serial and parallel I/O libraries in the Java class library Overview: RXTX Serial and Parallel I/O Libraares is an open source serial and parallel I/O library for the Java platform.It provides the function of communicating with serial port equipment, parallel port devices and other serial/parallel devices.This article will introduce the application of the RXTX library in the Java library and some example code using it. Installation of RXTX library: Before using the RXTX library, you need to install it first.The following is the step of installing the RXTX library in the Java project: 1. Download the installation program of the RXTX library, you can find it on the RXTX official website (http://ritx.qbang.org/). 2. According to the operating system used, select the correct version and install in the installation program. 3. After completing the installation, find the JAR file of the RXTX library and this glory file (.dll, .SO, etc.) matched with the operating system. Serial I/O communication: It is very simple to use the RXTX library to communicate in the serial port.Here are a Java code example using the RXTX library for serial I/O communication: import gnu.io.CommPort; import gnu.io.CommPortIdentifier; import gnu.io.SerialPort; import java.io.InputStream; import java.io.OutputStream; public class SerialCommunication { public static void main(String[] args) throws Exception { // Get the serial signs CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier("/dev/ttyUSB0"); // Open the serial port CommPort commPort = portIdentifier.open("SerialCommunication", 2000); // Check the serial type type if (commPort instanceof SerialPort) { SerialPort serialPort = (SerialPort) commPort; // Configure serial port serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); // Get the input and output stream InputStream inputStream = serialPort.getInputStream(); OutputStream outputStream = serialPort.getOutputStream(); // Read the data byte[] buffer = new byte[1024]; int len = 0; while ((len = inputStream.read(buffer)) > -1) { String data = new String(buffer, 0, len); System.out.println("Received data: " + data); } // send data String message = "Hello! This is a test message."; outputStream.write(message.getBytes()); // Close the flow and serial port inputStream.close(); outputStream.close(); serialPort.close(); } } } In the above example, first of all, we obtained a serial identifier and opened the serial port.We then set the parameters of the serial port, such as Potter rate, data digits, stop digits and verification.Next, we obtained the input and output stream of the serial port, and used the input stream to read data and the output stream sent data.Finally, when we do not need a serial port, we turn off the input output stream and serial port. Parallel I/O communication: Use the RXTX library to perform parallel I/O communication similar to serial communication.Here are a Java code example using the RXTX library for parallel I/O communication: import gnu.io.CommPort; import gnu.io.CommPortIdentifier; import gnu.io.ParallelPort; import java.io.InputStream; import java.io.OutputStream; public class ParallelCommunication { public static void main(String[] args) throws Exception { // Get the parallel port identifier CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier("/dev/parport0"); // Open the parallel port CommPort commPort = portIdentifier.open("ParallelCommunication", 2000); // Check the parallel port type if (commPort instanceof ParallelPort) { ParallelPort parallelPort = (ParallelPort) commPort; // Get the input and output stream InputStream inputStream = parallelPort.getInputStream(); OutputStream outputStream = parallelPort.getOutputStream(); // Read the data byte[] buffer = new byte[1024]; int len = 0; while ((len = inputStream.read(buffer)) > -1) { String data = new String(buffer, 0, len); System.out.println("Received data: " + data); } // send data String message = "Hello! This is a test message."; outputStream.write(message.getBytes()); // Close the flow and parallel port inputStream.close(); outputStream.close(); parallelPort.close(); } } } Similar to serial communication, in the above example, we first obtained a identifier of a parallel port and opened the parallel port.Then, we obtained the input and output stream of the parallel port, and using the input streaming data and using the output stream to send data.Finally, when we do not need a parallel port, we turn off the input output stream and parallel port. Summarize: RXTX Serial and Parallel I/O Libraries is a powerful Java library to communicate with serial and parallel devices.Through a simple example code, this article introduces the method of using the RXTX library in the Java class library for serial and parallel I/O communication.With these libraries, you can easily communicate with serial port equipment, parallel port equipment, and other serial/parallel devices, and achieve various applications.