RXTX串口通信 java
最近项目需要往串口里写消息 翻了翻资料 整理下
windows系统下：
1.需要文件 rxtxSerial.dll ，RXTXcomm.jar
2.dll文件放入到JDK安装路径下的bin文件夹
例：C:\Program Files\Java\jdk1.7.0_17\jre\bin
最好在jre里面也放一份
例：C:\Program Files\Java\jre7\bin
RXTXcomm.jar：——>导入到项目中 ——>添加引用——>右键项目——>Build Path——>Configure Build Path——>Libraries——>找到RXTXcomm.jar展开——>双击Native library location：（None）——>单击External Folder——>指向放入rxtxSerial.dll的bin文件夹
例：C:/Program Files/Java/jre7/bin
3.java代码
SerialReader 类
import gnu.io.*; import java.io.*; import java.util.*; @SuppressWarnings("rawtypes") public class SerialReader extends Observable implements Runnable,SerialPortEventListener{ static CommPortIdentifier portId; int delayRead = 100; int numBytes; // buffer中的实际数据字节数 private static byte[] readBuffer = new byte[1024]; //缓存串口读入的数据 static Enumeration portList; InputStream inputStream; OutputStream outputStream; static SerialPort serialPort; HashMap serialParams; Thread readThread;//端口是否打开了 boolean isOpen = false; // 端口读入数据事件触发后,等待n毫秒后再读取,以便让数据一次性读完 public static final String PARAMS_DELAY = "delay read"; // 延时等待端口数据准备的时间 public static final String PARAMS_TIMEOUT = "timeout"; // 超时时间 public static final String PARAMS_PORT = "port name"; // 端口名称 public static final String PARAMS_DATABITS = "data bits"; // 数据位 public static final String PARAMS_STOPBITS = "stop bits"; // 停止位 public static final String PARAMS_PARITY = "parity"; // 奇偶校验 public static final String PARAMS_RATE = "rate"; // 波特率 public boolean isOpen(){ return isOpen; } /** * 初始化端口操作的参数. * @throws SerialPortException * * @see */ public SerialReader(){ isOpen = false; } public void open(HashMap params){ serialParams = params; if(isOpen){ close(); } try{ // 参数初始化 int timeout = Integer.parseInt( serialParams.get( PARAMS_TIMEOUT ) .toString() ); int rate = Integer.parseInt( serialParams.get( PARAMS_RATE ) .toString() ); int dataBits = Integer.parseInt( serialParams.get( PARAMS_DATABITS ) .toString() ); int stopBits = Integer.parseInt( serialParams.get( PARAMS_STOPBITS ) .toString() ); int parity = Integer.parseInt( serialParams.get( PARAMS_PARITY ) .toString() ); delayRead = Integer.parseInt( serialParams.get( PARAMS_DELAY ) .toString() ); String port = serialParams.get( PARAMS_PORT ).toString(); // 打开端口 portId = CommPortIdentifier.getPortIdentifier( port ); serialPort = ( SerialPort ) portId.open( "SerialReader", timeout ); inputStream = serialPort.getInputStream(); serialPort.addEventListener( this ); serialPort.notifyOnDataAvailable( true ); serialPort.setSerialPortParams( rate, dataBits, stopBits, parity ); isOpen = true; } catch ( PortInUseException e ){ System.out.println("端口"+serialParams.get( PARAMS_PORT ).toString()+"已经被占用"+e); } catch ( TooManyListenersException e ){ System.out.println("端口"+serialParams.get( PARAMS_PORT ).toString()+"监听者过多"+e); } catch ( UnsupportedCommOperationException e ){ System.out.println("端口操作命令不支持"+e); } catch ( NoSuchPortException e ){ System.out.println("端口"+serialParams.get( PARAMS_PORT ).toString()+"不存在"+e); } catch ( IOException e ){ System.out.println("打开端口"+serialParams.get( PARAMS_PORT ).toString()+"失败"+e); } serialParams.clear(); Thread readThread = new Thread( this ); readThread.start(); } public void run(){ try{ Thread.sleep(50); } catch ( InterruptedException e ){ e.printStackTrace(); } } public void start(){ try { outputStream = serialPort.getOutputStream(); } catch (IOException e) { e.printStackTrace(); } try{ readThread = new Thread(this); readThread.start(); } catch (Exception e) { e.printStackTrace(); } } //start() end public void run(String message) { try { Thread.sleep(4); } catch (InterruptedException e) { e.printStackTrace(); } try { if(message!=null&&message.length()!=0) { System.out.println("发送数据:"+message); outputStream.write(message.getBytes()); //往串口发送数据，是双向通讯的。 } } catch (IOException e) { e.printStackTrace(); } } public void close(){ if (isOpen){ try{ serialPort.notifyOnDataAvailable(false); serialPort.removeEventListener(); inputStream.close(); serialPort.close(); isOpen = false; } catch (IOException ex){ ex.printStackTrace(); System.out.println("关闭串口失败"); } } } public void serialEvent( SerialPortEvent event ){ try{ Thread.sleep( delayRead ); } catch ( InterruptedException e ){ e.printStackTrace(); } switch ( event.getEventType() ){ case SerialPortEvent.BI: // 10 case SerialPortEvent.OE: // 7 case SerialPortEvent.FE: // 9 case SerialPortEvent.PE: // 8 case SerialPortEvent.CD: // 6 case SerialPortEvent.CTS: // 3 case SerialPortEvent.DSR: // 4 case SerialPortEvent.RI: // 5 case SerialPortEvent.OUTPUT_BUFFER_EMPTY: // 2 break; case SerialPortEvent.DATA_AVAILABLE: // 1 try{ // 多次读取,将所有数据读入 while (inputStream.available() > 0) { numBytes = inputStream.read(readBuffer); } //打印接收到的字节数据的ASCII码 for(int i=0;i<numBytes;i++){ // System.out.println("msg[" + numBytes + "]: [" +readBuffer[i] + "]:"+(char)readBuffer[i]); } // numBytes = inputStream.read( readBuffer ); changeMessage( readBuffer, numBytes ); } catch ( IOException e ){ e.printStackTrace(); } break; } } // 通过observer pattern将收到的数据发送给observer // 将buffer中的空字节删除后再发送更新消息,通知观察者 public void changeMessage( byte[] message, int length ){ setChanged(); byte[] temp = new byte[length]; System.arraycopy( message, 0, temp, 0, length ); notifyObservers( temp ); } public void openSerialPort(String message){ HashMap<String, Comparable> params = new HashMap<String, Comparable>(); String port="COM1"; String rate = "9600"; String dataBit = ""+SerialPort.DATABITS_8; String stopBit = ""+SerialPort.STOPBITS_1; int parityInt = SerialPort.PARITY_NONE; params.put( SerialReader.PARAMS_PORT, port ); // 端口名称 params.put( SerialReader.PARAMS_RATE, rate ); // 波特率 params.put( SerialReader.PARAMS_DATABITS,dataBit ); // 数据位 params.put( SerialReader.PARAMS_STOPBITS, stopBit ); // 停止位 params.put( SerialReader.PARAMS_PARITY, parityInt ); // 无奇偶校验 params.put( SerialReader.PARAMS_TIMEOUT, 100 ); // 设备超时时间 1秒 params.put( SerialReader.PARAMS_DELAY, 100 ); // 端口数据准备时间 1秒 try { open(params);//打开串口 //LoginFrame cf=new LoginFrame(); //addObserver(cf); //也可以像上面一个通过LoginFrame来绑定串口的通讯输出. if(message!=null&&message.length()!=0) { String str=""; for(int i=0;i<10;i++) { str+=message; } start(); run(str); } } catch (Exception e) { e.printStackTrace(); } } }
SerialInit 类
import gnu.io.SerialPort; import java.util.*; @SuppressWarnings("rawtypes") public class SerialInit implements Observer{ public SerialReader sr=new SerialReader(); public void test(){ openSerialPort(""); //打开串口 } public void update(Observable o, Object arg){ String mt=new String((byte[])arg); System.out.println("接收数据:"+mt); //串口数据 } /** * 打开串口 * @param String message */ public void openSerialPort(String message){ HashMap<String, Comparable> params = new HashMap<String, Comparable>(); String port="COM1"; String rate = "9600"; String dataBit = ""+SerialPort.DATABITS_8; String stopBit = ""+SerialPort.STOPBITS_1; int parityInt = SerialPort.PARITY_NONE; params.put( SerialReader.PARAMS_PORT, port ); // 端口名称 params.put( SerialReader.PARAMS_RATE, rate ); // 波特率 params.put( SerialReader.PARAMS_DATABITS,dataBit ); // 数据位 params.put( SerialReader.PARAMS_STOPBITS, stopBit ); // 停止位 params.put( SerialReader.PARAMS_PARITY, parityInt ); // 无奇偶校验 params.put( SerialReader.PARAMS_TIMEOUT,100 ); // 设备超时时间 1秒 params.put( SerialReader.PARAMS_DELAY, 100 ); // 端口数据准备时间 1秒 try { sr.open(params); sr.addObserver(this); sr.start(); sr.run(); } catch (Exception e) { e.printStackTrace(); } } }
测试类
public class Main { public static void main(String[] args) { SerialInit te=new SerialInit(); te.test(); te.sr.run("hello word!\n"); te.sr.run("你好！"); } }
