RXTX 在 ubuntu 中不起作用

问题描述

终于设法从 Windows 中的 rxtx 读取，但现在我无法让它在 Ubuntu 中工作.我使用 apt-get 获取 rxtx 库，但是当我运行应用程序时，我什么也看不到，尝试了几次-catch 块，我什至没有得到异常，而且由于目前无法进行基于 Ubuntu 的调试，因此我无法查明问题.(Ubuntu 是 12.04 64 位).

Finally managed to read from rxtx in windows but now I just cannot make it work in Ubuntu.I get the rxtx libs using apt-get ,but when i run the application,i can not see anything,tried a couple of try-catch blocks and i don't even get the exceptions,and since Ubuntu based debugging is not possible for now, i can not pinpoint the problem.(Ubuntu is 12.04 64 bit).

import gnu.io.*;
import java.io.*;
import javax.swing.JOptionPane;

public class ReadComPort {

    public static void main(String[] s) {
        readcomport();
    }

    public static String readcomport() {
        String value = null;

        try {
            // CommPortIdentifier portIdentifier = CommPortIdentifier
            // .getPortIdentifier("COM1");

            // String comportidentifier = "COM1"; //*win
            String comportidentifier = "/dev/ttyS0";

            CommPortIdentifier portIdentifier = null;
            portIdentifier = CommPortIdentifier.getPortIdentifier(comportidentifier);

            if (portIdentifier.isCurrentlyOwned()) {
                JOptionPane.showMessageDialog(null, "port in use");
            } else {

                SerialPort serialPort = (SerialPort) portIdentifier.open("ReadComPort", 500);
                JOptionPane.showMessageDialog(null, serialPort.getBaudRate());

                serialPort.setSerialPortParams(serialPort.getBaudRate(), SerialPort.DATABITS_8, SerialPort.STOPBITS_1,
                        SerialPort.PARITY_NONE);
                // serialPort.setFlowControlMode(SerialPort.FLOWCONTROL_RTSCTS_IN | SerialPort.FLOWCONTROL_RTSCTS_OUT);
                serialPort.setDTR(true);
                serialPort.setRTS(true);

                InputStream mInputFromPort = serialPort.getInputStream();

                Thread.sleep(500);
                byte mBytesIn[] = new byte[32];
                mInputFromPort.read(mBytesIn);

                value = new String(mBytesIn);

                mInputFromPort.close();
                serialPort.close();
            }
        } catch (Exception ex) {
            JOptionPane.showMessageDialog(null, "Exception : " + ex.getMessage());

        }

        return value;

    }
}

推荐答案

昨天遇到了同样的问题，发现 这个:

I had the same problem yesterday, and found this:

String serialPortID = "/dev/ttyAMA0";
System.setProperty("gnu.io.rxtx.SerialPorts", serialPortID);

也就是说，你需要设置gnu.io.rxtx.SerialPorts系统属性，值应该是你要打开的端口名.

Thath is, you need to set the gnu.io.rxtx.SerialPorts system property, and the value should be the name of the port you want to open.

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