java串口编程的实现

本文主要是java串口编程的例子

首先，要有comm.jar包

package cc.dfsoft.ranqi.util;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.text.SimpleDateFormat;import javax.comm.CommPortIdentifier;import javax.comm.NoSuchPortException;import javax.comm.PortInUseException;import javax.comm.SerialPort;import javax.comm.UnsupportedCommOperationException;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import cc.dfsoft.ranqi.bo.MachineCommand;import cc.dfsoft.ranqi.service.bean.gz.zngz.Command10Mgr;import cc.dfsoft.ranqi.service.bean.gz.zngz.impl.Command10;public class SerialBean{protected Log logger = LogFactory.getLog("serialBean");private String PortName;CommPortIdentifier portId;private SerialPort serialPort;private OutputStream out;private InputStream in;static int waitTime = 0;public SerialBean(int PortID) {PortName = "COM" + PortID;if(PortName.equalsIgnoreCase("com6")){logger = LogFactory.getLog("singal");}}/** * 新修改的接口，直接传入串口名称 * @param PortID */public SerialBean(String PortID) {PortName = PortID;if(PortName.equalsIgnoreCase("com6")){logger = LogFactory.getLog("singal");}}/** * * This function initialize the serial port for communication. It startss a * thread which consistently monitors the serial port. Any signal capturred * from the serial port is stored into a buffer area. * 本函数初始化所指定的串口并返回初始化结果。 * 如果初始化成功返回1，否则返回-1。 * 初始化的结果是该串口被SerialBean独占性使用，其参数被设置为9600, N, 8, 1。 * 如果串口被成功初始化，则打开一个进程读取从串口传入的数据并将其保存在缓冲区中。 * */public synchronized int initialize() {int InitSuccess = 1;int InitFail = -1;try {portId = CommPortIdentifier.getPortIdentifier(PortName);SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");try {serialPort = (SerialPort) portId.open("Serial_Communication"+PortName,3600);} catch (PortInUseException e) {e.printStackTrace();return InitFail;}//Use InputStream in to read from the serial port, and OutputStream//out to write to the serial port.InitFail = initStream();//Initialize the communication parameters to 9600, 8, 1, none.try {serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);} catch (UnsupportedCommOperationException e) {logger.info(e.getMessage());e.printStackTrace();return InitFail;}} catch (NoSuchPortException e) {logger.info(e.getMessage());e.printStackTrace();return InitFail;}return InitSuccess;}private int initStream() {try {in = serialPort.getInputStream();out = serialPort.getOutputStream();} catch (IOException e) {logger.info(e.getMessage());e.printStackTrace();return -1;}return 1;}/** * This function returns a string with a certain length from the incomin messages. * 本函数从串口(缓冲区)中读取指定长度的一个字符串。参数Length指定所返回字符串的长度。 */public synchronized byte[] readPort(byte[] aByte) {//logger.fatal("线程---串口：" + PortName + " 主机：" + aByte[0] + " 命令：" + aByte[1] + " 进入readPort方法");//initialize();//initStream();PropertyUtil proUtil = new PropertyUtil();waitTime = Integer.parseInt(proUtil.getCom("waitTime"));//读取配置文件中设置的等待时间byte[] bf = new byte[100];//供接收使用byte[] content = new byte[0];//update in 20070918 by liulei ,锁当前资源try {for (int i = 0; i < aByte.length; i++) {out.write(aByte[i]);}out.flush();//Thread.sleep(waitTime);int j = 0;while(in.available() == 0){Thread.sleep(waitTime);if(j > 2){logger.fatal("跳出循环，当前j== " + j + "无法读到字节数组; 串口：" + PortName + ",主机：" + aByte[0] + " ,命令：" + aByte[1]);//update by liulei in 2007.10.20,关闭串口同时关闭输入输出流//in.close();//out.close();//closePort();return content;}j++;}logger.info(PortName +":读到的字节数组长度----------------" + in.available());} catch (Exception e) {logger.info(e.getMessage());e.printStackTrace();}//update in 20070918 by liulei ,锁当前资源try{//logger.info("读到的字节数组长度：=== " + in.available());while(in.available() > 0){int num = in.read(bf);//从输入流中读取一定数量的字节并将其存储在缓冲区数组bf中content = new byte[num];for(int k = 0;k < num;k++){content[k] =  bf[k];}}} catch (Exception e) {logger.info(e.getMessage());e.printStackTrace();}//logger.info("得到值，关闭串口正常退出！");//update by liulei in 2007.10.20,关闭串口同时关闭输入输出流/*try {in.close();out.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}closePort();*/StringBuffer printResult = new StringBuffer(); if(aByte.length > 0){for (int i = 0; i < aByte.length; i++) {printResult.append(aByte[i]);printResult.append(",");}}logger.error("向串口: " + PortName + " 发送指令 : " + printResult.toString());StringBuffer printResult1 = new StringBuffer(); if(content.length > 0){for (int i = 0; i < content.length; i++) {printResult1.append(content[i]);printResult1.append(",");}}logger.error("从串口: " + PortName + " 返回值 : " + printResult1.toString());//判断10指令的处理结果if(aByte[1] == 16 && printResult1.toString().trim().length() == 9){if(aByte[2] == 0){logger.info("校验不成功......");}if(aByte[2] == 1){logger.info("校验成功......");}}//判断10指令的处理结果if(aByte[1] == 5 && printResult1.toString().trim().length() == 9){logger.info("校验不成功......");}if(aByte.length > 0 && content.length > 0){if(aByte[0] != content[0] || aByte[1] != content[1]){//logger.error("当前线程：" + Thread.currentThread().getName() + "从串口名称: " + PortName + "得到值不一致，进行拦截处理");return new byte[0];}}return content;}/** * This function sends a message through the serial port. * @param aByte The data of byte to be sent. * 本函数向串口发送一个字符串。参数Msg是需要发送的字符串。 */public void writePort(byte[] aByte) {PropertyUtil proUtil = new PropertyUtil();waitTime = Integer.parseInt(proUtil.getCom("waitTime"));//读取配置文件中设置的等待时间//update in 20070918 by liulei ,锁当前资源try {for (int i = 0; i < aByte.length; i++) {out.write(aByte[i]);}Thread.sleep(waitTime);//closePort();//initialize();} catch (Exception e) {e.printStackTrace();}}/** * * This function closes the serial port in use. * 本函数停止串口检测进程并关闭串口。 */public void closePort() {//RT.stop();serialPort.close();}}

图中蓝色部分为主要的初始化工作