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一個使用Java讀取串口的程序(1)

2019-11-18 13:24:42
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來源:轉載
供稿:網友

  以下是我寫的用java讀取串口的程序,應一些網友的要求在這里貼出來。這個程序里面還有一些問題,也希望有經驗的網友能夠給我提點意見。
  
  這個簡單的程序包括以下文件:
  
   IMU.java (主程序)
   ReadBuffer.java (從緩沖區讀取一個消息)
   ReadSerial.java (讀取串口數據并放入緩沖區)
   SerialBuffer.java (緩沖區)
   WriteSerial.java (不斷的往串口送星號'*')
  
  測試程序:
  
   SendCom.java (將一個數據文件往串口發送)
   SEND.TXT (供測試用的數據文件)
  
  在這個通訊程序中使用了一個簡單的協議,既不同的消息之間用星號'*'作為分隔。這個程序中的問題是ReadSerial進程和WriteSerial進程不能夠同時啟動,出錯信息是不能夠打開串口,因為同樣一個串口不能夠同時被打開兩次(在ReadSerial中聲明了FileReader
  
  測試程序:
  
   SendCom.java (將一個數據文件往串口發送)
   SEND.TXT (供測試用的數據文件)
  
  在這個通訊程序中使用了一個簡單的協議,既不同的消息之間用星號'*'作為分隔。這個程序中的問題是ReadSerial進程和WriteSerial進程不能夠同時啟動,出錯信息是不能夠打開串口,因為同樣一個串口不能夠同時被打開兩次(在ReadSerial中聲明了FileReader和在WriteSerial中聲明了FileWriter)。這樣是不能夠實現全雙工通訊的。不知道有沒有做過的大俠能夠講講處理的辦法。
  
  /*
  *
  * IMU.java 1.0
  * Main PRogram for Serial Communication
  *
  * Created: March 27, 2001
  *
  * Author : Qingye Jiang (John)
  * American GNC Corporation
  * 888 Easy St, Simi Valley CA 93065-1812
  *
  * Contact: (805) 582-0582 (Tel), (805) 582-0098 (Fax)
  * qjiang@tsinghua.edu
  *
  */
  
  import java.io.*;
  
  class IMU
  {
   public static void main(String[] args)
   {
   //TO DO: Add your JAVA codes here
  
   File ComPort = new File("COM1");
  
   SerialBuffer SB = new SerialBuffer();
   ReadSerial r1 = new ReadSerial(SB, ComPort);
   ReadBuffer r2 = new ReadBuffer(SB);
   WriteSerial r3 = new WriteSerial(ComPort);
  
   r1.start();
   r2.start();
   r3.start();
   }
  }
  
  /*
  *
  * ReadBuffer.java 1.0
  * Program to Read the Serial Buffer
  *
  * Created: March 27, 2001
  *
  * Author : Qingye Jiang (John)
  * American GNC Corporation
  * 888 Easy St, Simi Valley CA 93065-1812
  *
  * Contact: (805) 582-0582 (Tel), (805) 582-0098 (Fax)
  * qjiang@tsinghua.edu
  
  *
  */
  
  import java.io.*;
  
  public class ReadBuffer extends Thread
  {
   private SerialBuffer ComBuffer;
  
   public ReadBuffer(SerialBuffer SB)
   {
   ComBuffer = SB;
   }
  
   public void run()
   {
   String Msg;
  
   while (true)
   {
   Msg = ComBuffer.GetMsg();
   System.out.println(Msg);
   }
  
   }
  }
  
  /*
  *
  * ReadSerial.java 1.0
  * Program to read characters from the serial port and put it
  * to the buffer
  *
  * Created: March 27, 2001
  *
  * Author : Qingye Jiang (John)
  * American GNC Corporation
  * 888 Easy St, Simi Valley CA 93065-1812
  *
  * Contact: (805) 582-0582 (Tel), (805) 582-0098 (Fax)
  * qjiang@tsinghua.edu
  *
  */
  
  import java.io.*;
  
  public class ReadSerial extends Thread
  {
   private SerialBuffer ComBuffer;
   private File ComPort;
  
   public ReadSerial(SerialBuffer SB, File Port)
   {
   ComBuffer = SB;
   ComPort = Port;
   }
  
   public void run()
   {
   int c;
   try
   {
   FileReader in = new FileReader(ComPort);
   while (true)
   {
   c = in.read();
   ComBuffer.PutChar(c);
   }
   try
   {
   FileReader in = new FileReader(ComPort);
   while (true)
   {
   c = in.read();
  
   ComBuffer.PutChar(c);
   }
   } catch (IOException e) {}
   }
  }
  
  
  /*
  *
  * SerialBuffer.java 1.0
  * Class that implements the serial buffer
  *
  * Created: March 27, 2001
  *
  * Author : Qingye Jiang (John)
  * American GNC Corporation
  * 888 Easy St, Simi Valley CA 93065-1812
  *
  * Contact: (805) 582-0582 (Tel), (805) 582-0098 (Fax)
  * qjiang@tsinghua.edu
  
  *
  */
  
  public class SerialBuffer
  {
   private String Content = "";
   private String CurrentMsg, TempContent;
   private boolean available = false;
  
   public synchronized String GetMsg()
   {
   int SepMark;
  
   if ((SepMark = Content.indexOf('*')) == -1)
  {
   available = false;
   while (available == false)
   {
   try
   {
   wait();
   } catch (InterruptedException e) { }
   }
   SepMark = Content.indexOf('*');
   }
  
   CurrentMsg = Content.substring(0, SepMark);
   TempContent = Content.substring(SepMark+1);
   Content = TempContent;
   notifyAll();
   return CurrentMsg;
   }
  
   public synchronized void PutChar(int c)
   {
   Character d = new Character((char) c);
   Content = Content.concat(d.toString());
   if (c == '*')
   {
   available = true;
   }
   notifyAll();
   }
  }
  
  
  /*
  *
  * WriteSerial.java 1.0
  * Program to send a character to the serial port
  *
  * Created: March 27, 2001
  *
  * Author : Qingye Jiang (John)
  * American GNC Corporation
  * 888 Easy St, Simi Valley CA 93065-1812
  *
  * Contact: (805) 582-0582 (Tel), (805) 582-0098 (Fax)
  * qjiang@tsinghua.edu
  *
  */
  
  import java.io.*;
  
  public class WriteSerial extends Thread
  {
   private SerialBuffer ComBuffer;
   private File ComPort;
  
   public WriteSerial(File Port)
   {
   ComPort = Port;
   }
  
   public void run()
   {
   int c;
   try
   {
   FileWriter out = new FileWriter(ComPort);
   while (true)
   {
   out.write('*');
   }
   } catch (IOException e)
   {
   System.out.println(e.getMessage());
   }
   }
  }
  /*
  *
  * SendCom.java 1.0
  *
  * Project: Java Based Information Exchange Support System
  * Onboard Plug-in System
  * Sending data through serial port
  *
  * Created: March 15, 2001
  *
  * Author : Qingye Jiang (John)
  * American GNC Corporation
  * 888 Easy St, Simi Valley CA 93065-1812
  *
  * Contact: (805) 582-0582 (Tel), (805) 582-0098 (Fax)
  *
  */
  
  import java.io.*;
  
  public class SendCom
  {

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