java串口通信实例

package com.yuan;

import gnu.io.CommPortIdentifier;
import gnu.io.NoSuchPortException;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.TooManyListenersException;

public class SerialComm implements SerialPortEventListener, Runnable {
	public final static String PORT_OWER = "MonitorApp";
	private boolean isOpen;
	private boolean isStart;
	private boolean isSave;
	private boolean isPrint;
	private Thread readThread;
	private String portName;
	private String portAddress;
	private CommPortIdentifier portId;
	private SerialPort serialPort;
	private DataInputStream inputStream;
	private OutputStream outputStream;
	private SimpleDateFormat formatter;
	private String dataProtocol;
	private Object readEWriteLock = new Object();
	public SerialComm(){
		this.isOpen = false;
		this.isStart = false;
		this.isSave = true;
		this.isPrint = false;
		formatter = new SimpleDateFormat("[yyyy-MM-dd hh:mm:ss,SSS]");
		portName = "COM1";
		portAddress = "LOCAL";
		dataProtocol = "Gooseli";
	}
	public void init(String port,String protocol ) throws Exception{
		this.portName = port;
		this.portAddress = portName;
		this.dataProtocol = protocol;
		init();
	}
	public void init(String port,String address,String protocol) throws Exception{
		this.portName = port;
		this.portAddress =  address;
		this.dataProtocol = protocol;
	}
	public void init()throws IOException,Exception{
		if(isOpen){
			close();
		}
		try{
			portId = CommPortIdentifier.getPortIdentifier(portName);
			serialPort = (SerialPort)portId.open(PORT_OWER,2000);
			inputStream = new DataInputStream(serialPort.getInputStream());
			outputStream = serialPort.getOutputStream();
			isOpen = true;
		}catch(NoSuchPortException ex){
			throw new Exception(ex.toString());
		}
	}
	public void start()throws Exception{
		if(!isOpen){
			throw new Exception(portName + " has not bean opened!");
		}
		try{
			readThread = new Thread(this);
			readThread.start();
			serialPort.notifyOnDataAvailable(true);
			serialPort.addEventListener(this);
			isStart =  true;
		} catch( TooManyListenersException ex){
			throw new Exception(ex.toString());
		}
	}
	private void close() {
		stop();
		if(isOpen){
			try{
				inputStream.close();
				outputStream.close();
				serialPort.close();
				isOpen = false;
			}catch(IOException ex){
			}
		}
	}
	public void serialEvent(SerialPortEvent event) {
		switch (event.getEventType()) {
		case SerialPortEvent.BI:
		case SerialPortEvent.OE:
		case SerialPortEvent.FE:
		case SerialPortEvent.PE:
		case SerialPortEvent.CD:
		case SerialPortEvent.CTS:
		case SerialPortEvent.DSR:
		case SerialPortEvent.RI:
		case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
			break;
		case SerialPortEvent.DATA_AVAILABLE:// 当有可用数据时读取数据,并且给串口返回数据
			readComm();
			/*byte[] readBuffer = new byte[20];
			try {
				while (inputStream.available() > 0) {
					System.out.println(inputStream.available());
					int numBytes = inputStream.read(readBuffer);
					System.out.println(numBytes);
				}
				data = new String(readBuffer).trim();
				System.out.println(new String(readBuffer).trim());
			} catch (IOException e) {
				e.fillInStackTrace();
			}*/
			break;
		default:break;
		}
		
	}

	private void readComm() {
		byte[] readBuffer = new byte[20];
		try {
			while (inputStream.available() > 0) {
				System.out.println(inputStream.available());
				int numBytes = inputStream.read(readBuffer);
			}
			//data = new String(readBuffer).trim();
			System.out.println(new String(readBuffer).trim());
		} catch (IOException e) {
			e.fillInStackTrace();
		}
		/*StringBuffer readBuffer = new StringBuffer();
		String scannedInput = "";
		Date currentTime = null;
		String TimeStamp = "";
		int c ;
		char a;
		try {
			InputStreamReader fis = new InputStreamReader(inputStream,"utf-8");
			while((c=fis.read())!=-1){
				readBuffer.append((char)c);
			}
			scannedInput = readBuffer.toString().trim();
			currentTime = new Date();
			TimeStamp  = formatter.format(currentTime);
		} catch(IOException ex	){
			ex.printStackTrace();
		} catch(Exception exx){
			exx.printStackTrace();
		}*/
	}
	public void run() {
		/*while(true){
			try {
				Thread.sleep(2000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			String at = "test";
			writeComm(at);
			isPrint = true;
		}*/
		/*String at = "at^hcmgr=1\r";
		String strTemp = at+(char)Integer.parseInt("la",16) + "z";
		writeComm(strTemp);*/
	}
	private void writeComm(String outString) {
		synchronized(readEWriteLock){
			try{
				outputStream.write(outString.getBytes());
			} catch(IOException ex){
				ex.printStackTrace();
			}
		}
	}
	public void stop(){
		if(isStart){
			serialPort.notifyOnDataAvailable(false);
			serialPort.removeEventListener();
			isStart =false;
		}
	}
	public static void main(String[] args){
		SerialComm serialComm = new SerialComm();
		try {
			serialComm.init("COM2","Air");
			serialComm.start();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

 附件libs.rar为响应jar和需要放在jre里面的dll文件

评论

2 楼 smallbee 2012-08-03  

liuwei88212 写道

.dll文件放在哪呢？我放在了jdk/bin下面了，可是报异常了~~~
java.lang.Exception: javax.comm.NoSuchPortException
at 串口通讯.SerialComm.init(SerialComm.java:63)
at 串口通讯.SerialComm.init(SerialComm.java:45)
at 串口通讯.SerialComm.main(SerialComm.java:190)

java.lang.Exception: javax.comm.NoSuchPortException

应该不是dll问题吧，看异常，像是端口问题

1 楼 liuwei88212 2012-08-02  

.dll文件放在哪呢？我放在了jdk/bin下面了，可是报异常了~~~
java.lang.Exception: javax.comm.NoSuchPortException
at 串口通讯.SerialComm.init(SerialComm.java:63)
at 串口通讯.SerialComm.init(SerialComm.java:45)
at 串口通讯.SerialComm.main(SerialComm.java:190)