在ubuntu上使用Java进行串行端口识别 [英] serial port identification with java on ubuntu

问题描述

我正在尝试使用Java连接ubuntu上的串行应用程序
搜索和阅读资源后，我在库中添加了comm.jar和RXTXcomm.jar.
我使用以下代码来识别这些命令.在我的系统中，有三个端口，但是在ports.hasMoreElements()方法中显示为false.
请查看代码并为我提供帮助.

I'm trying to connect a serial application on ubuntu with Java
After searching and reading resources,I add comm.jar and RXTXcomm.jar in the library.
I use the following code to identify the comports. In my system there are three ports but it is showing false in ports.hasMoreElements() method.
Kindly look into the code and help me.

String wantedPortName = "/dev/ttya";
///dev/ttyS0 و /dev/ttyS1 نیز تست شد
Enumeration portIdentifiers = CommPortIdentifier.getPortIdentifiers();
CommPortIdentifier portId = null;  // will be set if port found
while (portIdentifiers.hasMoreElements())
{
    CommPortIdentifier pid = (CommPortIdentifier) portIdentifiers.nextElement();
    if(pid.getPortType() == CommPortIdentifier.PORT_SERIAL &&
      pid.getName().equals(wantedPortName)) 
  {
    portId = pid;
    break;
  }
}
if(portId == null)
{
     System.err.println("Could not find serial port " + wantedPortName);
     System.exit(1);
}    

推荐答案

在我的情况下，我正在使用Ubuntu，并且我的笔记本没有任何串行或并行端口.

In my case, I'm using Ubuntu, and my notebook does not have any serial or paralel ports.

因此，您必须模拟这种端口:

So, you have to simulate this kind of port:

apt-get install socat

运行它:

socat -d -d pty,raw,echo=0, pty,raw,echo=0

根据输出，请注意创建的设备":

According to output, pay attention to "devices" created:

2014/02/05 01:04:32 socat[7411] N PTY is /dev/pts/2
2014/02/05 01:04:32 socat[7411] N PTY is /dev/pts/3
2014/02/05 01:04:32 socat[7411] N starting data transfer loop with FDs [3,3] and [5,5]

停止socat [CTRL] + [C]并将其符号链接到RXTX将识别为设备的位置(由于前缀"tty")

Stop socat [CTRL]+[C] and symlink it to a location that RXTX will recognise as a device, due to "tty" prefix:

sudo ln -s /dev/pts/2 /dev/ttyUSB02
sudo ln -s /dev/pts/3 /dev/ttyUSB03

现在，再次运行socat

Now, run socat again

socat -d -d pty,raw,echo=0 pty,raw,echo=0

现在，使用以下代码，您将看到2个虚拟端口:

Now, using following code, you will see 2 virtual ports:

        Enumeration portList = CommPortIdentifier.getPortIdentifiers();//this line was false
        System.out.println(portList.hasMoreElements());

        while(portList.hasMoreElements()){
            System.out.println("Has more elements");
             CommPortIdentifier portId = (CommPortIdentifier) portList.nextElement();
               if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                    System.out.println(portId.getName());
               }
               else{
                     System.out.println(portId.getName());
               }
        }

system.out:

system.out:

true
Has more elements
/dev/ttyUSB03
Has more elements
/dev/ttyUSB02

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