1.首先下载相应的jar文件
压缩包包括:RXTXcomm.jar(64位环境)、win32com.dll和m.properties。
下载地址:/download/mr_yaoziyang/11939205
介绍：RXTXcomm.jar提供了通讯用的java API，win32com.dll提供了供RXTXcomm.jar调用的本地驱动接口，m.properties是这个驱动的类配置文件
2.拷贝RXTXcomm.jar到<JAVA_HOME>\jre\lib\ext目录下面;
3.拷贝m.properties到<JAVA_HOME>\jre\lib目录下面;
4.拷贝win32com.dll到<JAVA_HOME>\jre\bin目录下面;
5.封装Rs232Util.java 工具类
import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.IOException;import java.io.InputStream;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Calendar;import java.util.Date;import java.util.Enumeration;import java.util.List;import mPort;import mPortIdentifier;import gnu.io.NoSuchPortException;import gnu.io.PortInUseException;import gnu.io.SerialPort;import gnu.io.UnsupportedCommOperationException;public class Rs232Util {private static Rs232Util rs232Util = null;static {// 在该类被ClassLoader加载时就初始化一个SerialTool对象if (rs232Util == null) {rs232Util = new Rs232Util();}}// 私有化SerialTool类的构造方法，不允许其他类生成SerialTool对象private Rs232Util() {}/*** 获取提供服务的SerialTool对象* * @return rs232Util*/public static Rs232Util getSerialTool() {if (rs232Util == null) {rs232Util = new Rs232Util();}return rs232Util;}/*** 查找所有可用端口* * @return 可用端口名称列表*/public static final ArrayList<String> findPort() {// 获得当前所有可用串口@SuppressWarnings("unchecked")Enumeration<CommPortIdentifier> portList = CommPortIdentifier.getPortIdentifiers();ArrayList<String> portNameList = new ArrayList<String>();// 将可用串口名添加到List并返回该Listwhile (portList.hasMoreElements()) {String portName = portList.nextElement().getName();portNameList.add(portName);}return portNameList;}/*** 打开串口* * @param portName 端口名称* @param baudrate 波特率* @return 串口对象* @throws SerialPortParameterFailure 设置串口参数失败* @throws PortInUseException* @throws NoSuchPortException* @throws NotASerialPort 端口指向设备不是串口类型* @throws NoSuchPort 没有该端口对应的串口设备* @throws PortInUse 端口已被占用*/public static final SerialPort openPort(String portName, int baudrate) {// 通过端口名识别端口CommPortIdentifier portIdentifier = null;CommPort commPort = null;try {portIdentifier = CommPortIdentifier.getPortIdentifier(portName);// 打开端口，并给端口名字和一个timeout（打开操作的超时时间）commPort = portIdentifier.open(portName, 5000);} catch (NoSuchPortException e1) {e1.printStackTrace();} catch (PortInUseException e) {e.printStackTrace();}// 判断是不是串口if (commPort instanceof SerialPort) {SerialPort serialPort = (SerialPort) commPort;try {// 设置一下串口的波特率,载波位,停止位,校验位serialPort.setSerialPortParams(baudrate, SerialPort.DATABITS_8, SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);} catch (UnsupportedCommOperationException e) {System.out.println("设置串口参数失败！打开串口操作未完成！");}System.out.println("Open " + portName + " sucessfully !");return serialPort;} else {System.out.println("端口号不是串口！");return null;}}/*** 关闭串口* * @param serialport 待关闭的串口对象*/public static void closePort(SerialPort serialPort) {if (serialPort != null) {serialPort.close();serialPort = null;}}/*** 往串口发送数据* * @param serialPort 串口对象* @param order待发送数据* @throws SendDataToSerialPortFailure 向串口发送数据失败* @throws SerialPortOutputStreamCloseFailure 关闭串口对象的输出流出错*/public static void sendToPort(SerialPort serialPort, byte[] order) {BufferedOutputStream out = null;try {out = new BufferedOutputStream(serialPort.getOutputStream());out.write(order);out.flush();} catch (IOException e) {System.out.println("串口数据发送流关闭失败！");} finally {try {if (out != null) {out.close();out = null;}} catch (IOException e) {System.out.println("串口数据发送流关闭失败！");}}}/*** 从串口读取数据* * @param serialPort 当前已建立连接的SerialPort对象* @return 读取到的数据* @throws ReadDataFromSerialPortFailure从串口读取数据时出错* @throws SerialPortInputStreamCloseFailure 关闭串口对象输入流出错*/public static byte[] readFromPort(SerialPort serialPort) {InputStream in = null;byte[] bytes = null;try {in = new BufferedInputStream(serialPort.getInputStream());// in = serialPort.getInputStream();int bufflenth = in.available(); // 获取buffer里的数据长度if (bufflenth == 0) {closePort(serialPort);throw new NullPointerException("未返回数据");}//System.out.println("获取buffer里的数据长度:::"+bufflenth);while (bufflenth != 0) {bytes = new byte[bufflenth]; // 初始化byte数组为buffer中数据的长度in.read(bytes);bufflenth = in.available();}} catch (IOException e) {System.out.println("读取数据失败！");} finally {try {if (in != null) {in.close();in = null;}} catch (IOException e) {System.out.println("串口数据读取流关闭失败！");}}return bytes;}/*** 16进制转BCD码 发送命令请求* * @param s* @return*/public static byte[] hexStringToByteArray(String s) {int len = s.length();byte[] data = new byte[len / 2];try {for (int i = 0; i < len; i += 2) {data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));}} catch (Exception e) {}return data;}/*** 字节数组转16进制* * @param bytes* @return*/public static String bytesToHex(byte[] bytes) {StringBuffer sb = new StringBuffer();for (int i = 0; i < bytes.length; i++) {String hex = Integer.toHexString(bytes[i] & 0xFF);if (hex.length() < 2) {sb.append(0);}sb.append(hex);}return sb.toString();}/*** @函数功能: BCD码转为10进制串(阿拉伯数据)* @输入参数: BCD码* @输出结果: 10进制串*/public static String bcd2Str(byte[] bytes) {StringBuffer temp = new StringBuffer(bytes.length * 2);for (int i = 0; i < bytes.length; i++) {temp.append((byte) ((bytes[i] & 0xf0) >>> 4));temp.append((byte) (bytes[i] & 0x0f));}return temp.toString().substring(0, 1).equalsIgnoreCase("0") ? temp.toString().substring(1) : temp.toString();}/*** @函数功能: 10进制串转为BCD码* @输入参数: 10进制串* @输出结果: BCD码*/public static byte[] str2Bcd(String asc) {int len = asc.length();int mod = len % 2;if (mod != 0) {asc = "0" + asc;len = asc.length();}byte abt[] = new byte[len];if (len >= 2) {len = len / 2;}byte bbt[] = new byte[len];abt = asc.getBytes();int j, k;for (int p = 0; p < asc.length() / 2; p++) {if ((abt[2 * p] >= '0') && (abt[2 * p] <= '9')) {j = abt[2 * p] - '0';} else if ((abt[2 * p] >= 'a') && (abt[2 * p] <= 'z')) {j = abt[2 * p] - 'a' + 0x0a;} else {j = abt[2 * p] - 'A' + 0x0a;}if ((abt[2 * p + 1] >= '0') && (abt[2 * p + 1] <= '9')) {k = abt[2 * p + 1] - '0';} else if ((abt[2 * p + 1] >= 'a') && (abt[2 * p + 1] <= 'z')) {k = abt[2 * p + 1] - 'a' + 0x0a;} else {k = abt[2 * p + 1] - 'A' + 0x0a;}int a = (j << 4) + k;byte b = (byte) a;bbt[p] = b;}return bbt;}/*** 把byte转为字符串的bit* * @param b* @return*/public static String byteToBit(byte b) {return "" + (byte) ((b >> 7) & 0x1) + (byte) ((b >> 6) & 0x1) + (byte) ((b >> 5) & 0x1)+ (byte) ((b >> 4) & 0x1) + (byte) ((b >> 3) & 0x1) + (byte) ((b >> 2) & 0x1) + (byte) ((b >> 1) & 0x1)+ (byte) ((b >> 0) & 0x1);}/*** 把bit转为字节 byte* * @param byteStr* @return*/public static byte bitToByte(String byteStr) {int re, len;if (null == byteStr) {return 0;}len = byteStr.length();if (len != 4 && len != 8) {return 0;}if (len == 8) {// 8 bit处理if (byteStr.charAt(0) == '0') {// 正数re = Integer.parseInt(byteStr, 2);} else {// 负数re = Integer.parseInt(byteStr, 2) - 256;}} else {// 4 bit处理re = Integer.parseInt(byteStr, 2);}return (byte) re;}/*** 将字符串转成ASCII* * @param value* @return*/public static String stringToAscii(String value) {StringBuffer sbu = new StringBuffer();char[] chars = value.toCharArray();for (int i = 0; i < chars.length; i++) {if (i != chars.length - 1) {sbu.append((int) chars[i]).append(",");} else {sbu.append((int) chars[i]);}}return sbu.toString();}/*** 将ASCII转成字符串的* * @param value* @return*/public static String asciiToString(String value) {StringBuffer sbu = new StringBuffer();String[] chars = value.split(",");for (int i = 0; i < chars.length; i++) {sbu.append((char) Integer.parseInt(chars[i]));}return sbu.toString();}
