java串口扩展包的配置介绍
1.下载
sun的官方下载 http://java.sun.com/products/javacomm/只提供solaris平台的x86/sparc架构及linux平台x86架构的扩展API，目前最新版本为3.0。
windows平台的扩展包到以下地址下载，http://llk.media.mit.edu/projects/cricket/software/javaSerial.zip（两个文件夹里面有所需的3个文件），http://mdubuc.freeshell.org/Jolt/javacomm20-win32.zip和（完整的2.0版本，还有examples）。
2.配置
将解压得到的三个文件分别放入以下位置，
javax.comm.properties--------> %JAVA_HOME%/jre/lib
comm.jar--------> %JAVA_HOME%/jre/lib/ext
win32com.dll--------> %JAVA_HOME%/jre/bin
3.测试
启动eclilpse 新建工程，导入samples/simple/文件夹中SimpleRead.java(添加一些代码，查看代码)，将comm.jar添加到构建路径中，运行程序。
4.程序运行结果（在我机器上的效果）
port COM4 port COM6 port COM5 port LPT1 port LPT2
* 如果使用eclipse，需要设置<窗口>/<首选项>/<java>/<已安装的jre>为上述所说的jdk路径。
/*SimpleRead.java*/
import java.io.*; import java.util.*; import javax.comm.*;
public class SimpleRead implements Runnable, SerialPortEventListener { static CommPortIdentifier portId; static Enumeration portList;
InputStream inputStream; SerialPort serialPort; Thread readThread;
public static void main(String[] args) { portList = CommPortIdentifier.getPortIdentifiers(); while (portList.hasMoreElements()) { portId = (CommPortIdentifier) portList.nextElement(); System.out.println("port "+portId.getName()); if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) { if (portId.getName().equals("COM1")) { //if (portId.getName().equals("/dev/term/a")) { SimpleRead reader = new SimpleRead(); } } } }
public SimpleRead() { try { serialPort = (SerialPort) portId.open("SimpleReadApp", 2000); } catch (PortInUseException e) {} try { inputStream = serialPort.getInputStream(); } catch (IOException e) {} try { serialPort.addEventListener(this); } catch (TooManyListenersException e) {} serialPort.notifyOnDataAvailable(true); try { serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); } catch (UnsupportedCommOperationException e) {} readThread = new Thread(this); readThread.start(); }
public void run() { try { Thread.sleep(20000); } catch (InterruptedException e) {} }
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: byte[] readBuffer = new byte[20];
try { while (inputStream.available() > 0) { int numBytes = inputStream.read(readBuffer); } System.out.print(new String(readBuffer)); } catch (IOException e) {} break; } } }