简单的Java串口通讯应答示例

java串口通讯第一次使用，找的资料都比较麻烦，一时没有理出头绪，自己在示例的基础上整理了一个简单的应答示例，比较简陋，但演示了java串口通讯的基本过程。

package com.garfield.comm;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import javax.comm.CommPortIdentifier;

import javax.comm.SerialPort;

public class SimpleCommIO implements Runnable {

    static CommPortIdentifier portId;

    static String cmdHand = "I\r\n";

    static String cmdWeight = "WX\r\n";

    static SerialPort serialPort;

    static OutputStream outputStream;

    static String comm="COM11";

    InputStream inputStream;

    Thread readThread;

    public void run() {

        while (true) {

            try {

                byte[] readBuffer = new byte[200];

                try {

                    while (inputStream.available() > 0) {

                        int numBytes = inputStream.read(readBuffer);

                        System.out.print("收到数据："+new String(readBuffer));

                    }

                } catch (IOException e) {

                    e.printStackTrace();

                }

                Thread.sleep(2000);

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

    }

    public void initComm() {

        try{

            portId = CommPortIdentifier.getPortIdentifier(comm);

            serialPort = (SerialPort) portId.open("SimpleCommIO",2000);

            outputStream = serialPort.getOutputStream();

            inputStream = serialPort.getInputStream();

            serialPort.setSerialPortParams(9600,

                    SerialPort.DATABITS_8,

                    SerialPort.STOPBITS_1,

                    SerialPort.PARITY_NONE);

        }catch(Exception e){

            e.printStackTrace();

        }

    }

    public void writeComm(String cmd) {

        try {

            outputStream.write(cmd.getBytes());

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    public static void main(String[] args) {

        SimpleCommIO reader = new SimpleCommIO();

        reader.initComm();

        Thread readThread = new Thread(reader);

        readThread.start();

        System.out.println("发出指令："+cmdHand);

        reader.writeComm(cmdHand);

        //暂停一会儿

        try {

            Thread.sleep ( 2000 ) ;

        } catch (InterruptedException ie)

        {

        }

        System.out.println("发出指令："+cmdWeight);

        reader.writeComm(cmdWeight);

    }

}

另注配置：

将javacomm20-win32 .zip下载的文件解压缩后，在\javacomm20-win32\commapi目录下有必需的三个文件：

comm.jar，javax.comm. properties和win32comm.dll。

将文件comm.jar拷贝到%JAVA_HOME%\jre\lib\ext;

文件 javax.comm. properties拷贝到%JAVA_HOME%\jre\lib;

文件win32comm.dll拷贝到%JAVA_HOME%\bin。

注意%JAVA_HOME%是jdk的路径，而非jre。