JAVA编写DLT 645串口程序

import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.ArrayList;import java.util.Enumeration;import java.util.TooManyListenersException;import javax.comm.CommPortIdentifier;import javax.comm.NoSuchPortException;import javax.comm.PortInUseException;import javax.comm.SerialPort;import javax.comm.SerialPortEvent;import javax.comm.SerialPortEventListener;import javax.comm.UnsupportedCommOperationException;/*串口工具类*/public class SerialUtil implements SerialPortEventListener {private ArrayList<String> portList;private CommPortIdentifier portId;private SerialPort serialPort;private OutputStream outputStream;private InputStream inputStream;private int packetlength=0;static final char[] HEX_CHAR_TABLE = { '0', '1', '2', '3', '4', '5', '6','7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };/** * 扫描本机的所有COM端口 *  */public void scanPorts() {portList = new ArrayList<String>();Enumeration<?> en = CommPortIdentifier.getPortIdentifiers();CommPortIdentifier portId;while (en.hasMoreElements()) {portId = (CommPortIdentifier) en.nextElement();if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {String name = portId.getName();if (!portList.contains(name)) {portList.add(name);}}}if (null == portList || portList.isEmpty()) {System.out.println("未找到可用的串行端口号,程序无法启动!");}}/** * 打开串行端口 *  */public void openSerialPort(String portname) {// 获取要打开的端口try {portId = CommPortIdentifier.getPortIdentifier(portname);} catch (NoSuchPortException e) {System.out.println("抱歉,没有找到" + portname + "串行端口号!");return;}}/** * 设置端口参数 *  * @param rate * @param data * @param stop * @param parity */public void setSeriaPortParam(int rate, int data, int stop, int parity) {// 打开端口try {serialPort = (SerialPort) portId.open("test", 2000);} catch (PortInUseException e) {System.out.println(serialPort.getName() + "端口已被占用,请检查!");return;}// 设置端口参数try {serialPort.setSerialPortParams(rate, data, stop, parity);} catch (UnsupportedCommOperationException e) {e.printStackTrace();}// 打开端口的IO流管道try {outputStream = serialPort.getOutputStream();inputStream = serialPort.getInputStream();} catch (IOException e) {e.printStackTrace();}// 给端口添加监听器try {serialPort.addEventListener(this);} catch (TooManyListenersException e) {e.printStackTrace();}serialPort.notifyOnDataAvailable(true);}/** * 给串行端口发送数据 *  */public void sendDataToSeriaPort(byte[] b) {try {outputStream.write(b);outputStream.flush();} catch (IOException e) {e.printStackTrace();}}/** * 关闭串行端口 *  */public void closeSerialPort() {try {if (outputStream != null)outputStream.close();if (inputStream != null)inputStream.close();if (serialPort != null)serialPort.close();} catch (Exception e) {e.printStackTrace();}}/** * 事件监听 */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://数据处理String data=toHexString(getPack(packetlength));System.out.println("返回数据"+data);}}public byte[] getPack(int packetlength) {while (true) {// PacketLength为数据包长度byte[] msgPack = new byte[packetlength];for (int i = 0; i < packetlength; i++) {int newData = 0;try {if ((newData = inputStream.read()) != -1) {msgPack[i] = (byte) newData;}} catch (IOException e) {e.printStackTrace();}}return msgPack;}}public String toHexString(byte[] data) {if (data == null || data.length == 0)return null;byte[] hex = new byte[data.length * 2];int index = 0;for (byte b : data) {int v = b & 0xFF;hex[index++] = (byte) HEX_CHAR_TABLE[v >>> 4];hex[index++] = (byte) HEX_CHAR_TABLE[v & 0xF];}return new String(hex);}public int getPacketlength() {return packetlength;}public void setPacketlength(int packetlength) {this.packetlength = packetlength;}}