JAVA对串口设备进行操作

转自：http://blog.csdn.net/kingvan/article/details/53843

 

做金融终端开发经常需要写一些设备的控制程序，提取出了一个串口操作的基本框架以防日后忘记，当然针对具体串口设备可能要作相关修改。

import java.io.*;
import javax.comm.*;

public class SomeSerial implements SerialPortEventListener {
  private byte[] readinfo;
  private InputStream in;
  private OutputStream out;
  private SerialPort serialPort = null;

  public SomeSerial(String port) throws Exception {
    CommPortIdentifier portId = CommPortIdentifier.getPortIdentifier(port);
    serialPort = (SerialPort)portId.open("Serial_Communication", 2000);
      serialPort.setSerialPortParams(9600,
                                     SerialPort.DATABITS_8,
                                     SerialPort.STOPBITS_1,
                                     SerialPort.PARITY_NONE);
  }

  public synchronized void serialEvent(SerialPortEvent event) {
    switch (event.getEventType()) {
      case SerialPortEvent.BI:
        break;
      case SerialPortEvent.OE:
        break;
      case SerialPortEvent.FE:
        break;
      case SerialPortEvent.PE:
        break;
      case SerialPortEvent.CD:
        break;
      case SerialPortEvent.CTS:
        break;
      case SerialPortEvent.DSR:
        break;
      case SerialPortEvent.RI:
        break;
      case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
        break;
      case SerialPortEvent.DATA_AVAILABLE:
        synchronized (this) {
          try {
            int count = in.available();
            readinfo = new byte[count];
            in.read(readinfo);
          }
          catch (Exception e) {
            e.printStackTrace();
          }
          this.notify();
        }
        break;
    }
  }

  public int nstop() throws Exception {
    in.close();
    out.close();
    serialPort.close();
    return 0;
  }

  private void getData() throws Exception {
    serialPort.removeEventListener();
    serialPort.addEventListener(this);
    serialPort.notifyOnDataAvailable(true);
    in = serialPort.getInputStream();
  }
 
  public synchronized int doSomething() throws Exception {
    try {
      synchronized (this) {
        out = serialPort.getOutputStream();
        //发送指令；
        out.write(new byte[] {...});
        out.flush();
        getData();
        wait();
        //可继续进行处理
        ...
      }
    }
    catch (Exception e) {
      e.printStackTrace();
      return 1;
    }
    return 0;
  }
}