java - 检索具有 2 个不同类的 JTextArea 上的 GPS 数据

Question

我有一个 GPS 接收器。我创建一个类来检索 Eclipse 控制台上的所有 GPS 数据。(这是makia42的代码)

public class COM implements Runnable{
 static   Thread myThread=null;
 static   BufferedReader br;
 static   BufferedWriter wr;
 static   InputStreamReader isr;
 static   OutputStreamWriter osw;
 static   java.io.RandomAccessFile port;

    public  COM(){ /**Constructeur*/
          myThread=new Thread(this);
    }

    public void start(){
        try {
           port=new java.io.RandomAccessFile("COM3","rwd");
           port.writeBytes("\r\n");
           port.writeBytes("c,31,0,0,5\r\n");
           port.writeBytes("T,1000,1\r\n");
        }
        catch (Exception e) {
        System.out.println("start "+e.toString());
        }
        myThread.start();
    }


    public void run() {
          System.out.println("lecture COM...");
          for(;;){
              String st = null;
            try {
                st=port.readLine();
            } catch (IOException e) {System.out.println(e.getMessage());}
                        System.out.println(st);
          }
     }
    public static void main(String[] args) {

              COM temp= new COM();
              temp.start();
    }
}

我有另一个类，它是一个包含按钮和 JTextArea 的框架。该类与我的第一类 COM 进行通信。

当我单击该按钮时，COM 将启动并在 Eclipse 控制台中显示数据。但现在，我想在我的 JTextArea 上显示它。

我该怎么做？

最诚挚的问候，

bean 腐

Answer 1

花点时间阅读 this pattern 。使 Thread一个Subject 。在开始注册包含 JTextArea 的类的实例之前作为Observer以 Thread 为例。在run()使用 notify(String) 而不是在控制台上打印;

public void run() {
      System.out.println("lecture COM...");
      for(;;){
          String st = null;
        try {
            st=port.readLine();
        } catch (IOException e) {System.out.println(e.getMessage());}
                    System.out.println(st);
      }
}

更改为

public void run() {
      System.out.println("lecture COM...");
      for(;;){
          String st = null;
        try {
            st=port.readLine();
        } catch (IOException e) {System.out.println(e.getMessage());}
                   notifyObservers(st); //Pass the data to the observers.
      }
}

编辑:我想你可以重写 Thread到一个简单的类(class)。它会使程序在读取时无响应，这就是为什么你有 Thread 。我想你可以使用 Future<String> 实现更干净的方式

public class GpsReader {
    public class GenericGPSException extends Exception {

        public GenericGPSException(String message, Throwable cause) {
            super(message, cause);
        }
    }

    public static void main(String[] args) {

        // Example of usage

        GpsReader gpsReader = new GpsReader();

        String messageFromDevice;
        try {
            // Try read it
            messageFromDevice = gpsReader.getCoordinate();
        } catch (GenericGPSException e) {
            // Error, what does it says?
            messageFromDevice = e.getMessage();
        }

        JTextArea mockArea = new JTextArea();
        // Show to user anything that comes to it.
        mockArea.setText(messageFromDevice);

    }

    private boolean isReady;

    private RandomAccessFile port;

    public GpsReader() {
    }

    public String getCoordinate() throws GenericGPSException {

        if (!isReady) {
            try {
                port = new RandomAccessFile("COM3", "rwd");
                port.writeBytes("\r\n");
                port.writeBytes("c,31,0,0,5\r\n");
                port.writeBytes("T,1000,1\r\n");
                isReady = true;
            } catch (FileNotFoundException e) {
                throw new GenericGPSException(
                        "Error at starting communication to Device ", e);
            } catch (IOException e) {
                throw new GenericGPSException(
                        "Error at starting communication to Device ", e);
            }

        }

        try {
            return port.readLine();
        } catch (IOException e) {
            throw new GenericGPSException("Error at reading the Device ", e);
        }
    }
}