如何使用Java读取串口的程序(转)
小编给大家分享一下如何使用Java读取串口的程序(转)，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
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这个简单的程序包括以下文件：
IMU.java (主程序)
ReadBuffer.java
(从缓冲区读取一个消息)
ReadSerial.java (读取串口数据并放入缓冲区)
SerialBuffer.java
(缓冲区)
WriteSerial.java (不断的往串口送星号´*´)
测试程序：
SendCom.java
(将一个数据文件往串口发送)
SEND.TXT
(供测试用的数据文件)
在这个通讯程序中使用了一个简单的协议，既不同的消息之间用星号´*´作为分隔。这个程序中的问题是ReadSerial进程和WriteSerial进程不能够同时启动，出错信息是不能够打开串口，因为同样一个串口不能够同时被打开两次(在ReadSerial中声明了FileReader
测试程序：
SendCom.java
(将一个数据文件往串口发送)
SEND.TXT
(供测试用的数据文件)
在这个通讯程序中使用了一个简单的协议，既不同的消息之间用星号´*´作为分隔。这个程序中的问题是ReadSerial进程和WriteSerial进程不能够同时启动，出错信息是不能够打开串口，因为同样一个串口不能够同时被打开两次(在ReadSerial中声明了FileReader和在WriteSerial中声明了FileWriter)。这样是不能够实现全双工通讯的。
------------------------------------------
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();
}
}
---------------------------------------------
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);
}
}
}
-----------------------------------------------
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)
{}
}
}
------------------------------------------------
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();
}
}
-------------------------------------------------
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());
}
}
}
-----------------------------------------------
import
java.io.*;
public class SendCom
{
public static void main(String[]
args)
{
File OutFile = new File("SEND.TXT");
File ComPort = new
File("COM2");
int c;
try
{
FileReader in = new
FileReader(OutFile);
FileWriter out = new FileWriter(ComPort);
while ((c =
in.read()) != -1)
out.write(c);
in.close();
out.close();
} catch
(IOException e)
{}
}
}
----------------------------------------------
SEND.TXT*
This
is a sample of the data file for program testing. *
It should be in the
same directory as the SendCom.class file.*
When you run this sample
program, connect your COM1 and COM2 with a
serial cable so that you can test
this program on one machine. If
you have two machines, you can connect the
two machine via a serial
cable and test it. Modified the definition of
ComPort in the program
if necessary. *
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