RXTX串口通信 java代码实现

package com.runtrial.lms.rxtx;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.TooManyListenersException;

import gnu.io.CommPortIdentifier;
import gnu.io.PortInUseException;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;  

/**
 * @项目名称 :illegalsms
 * @文件名称 :SerialPort.java
 * @所在包 :org.serial
 * @功能描述 : 串口类
 * @修改记录 :
 */
public class DSerialPort implements Runnable, SerialPortEventListener {

    private String appName = "串口通讯测试[集成显卡2012]";
    private int timeout = 2000;// open 端口时的等待时间
    private int threadTime = 0;

    private CommPortIdentifier commPort;
    private SerialPort serialPort;
    private InputStream inputStream;
    private OutputStream outputStream;

    /**
     * @方法名称 :listPort
     * @功能描述 :列出所有可用的串口
     * @返回值类型 :void
     */
    @SuppressWarnings("rawtypes")
    public void listPort() {
        CommPortIdentifier cpid;
        Enumeration en = CommPortIdentifier.getPortIdentifiers();

        System.out.println("now to list all Port of this PC：" + en);

        while (en.hasMoreElements()) {
            cpid = (CommPortIdentifier) en.nextElement();
            if (cpid.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                System.out.println(cpid.getName() + ", " + cpid.getCurrentOwner());
            }
        }
    }

    /**
     * @方法名称 :selectPort
     * @功能描述 :选择一个端口，比如：COM1
     * @返回值类型 :void
     * @param portName
     */
    @SuppressWarnings("rawtypes")
    public void selectPort(String portName) {

        this.commPort = null;
        CommPortIdentifier cpid;
        Enumeration en = CommPortIdentifier.getPortIdentifiers();

        while (en.hasMoreElements()) {
            cpid = (CommPortIdentifier) en.nextElement();
            if (cpid.getPortType() == CommPortIdentifier.PORT_SERIAL && cpid.getName().equals(portName)) {
                this.commPort = cpid;
                break;
            }
        }

        openPort();
    }

    /**
     * @方法名称 :openPort
     * @功能描述 :打开SerialPort
     * @返回值类型 :void
     */
    private void openPort() {
        if (commPort == null)
            log(String.format("无法找到名字为'%1$s'的串口！", commPort.getName()));
        else {
            log("端口选择成功，当前端口：" + commPort.getName() + ",现在实例化 SerialPort:");

            try {
                serialPort = (SerialPort) commPort.open(appName, timeout);
                log("实例 SerialPort 成功！");
            } catch (PortInUseException e) {
                throw new RuntimeException(String.format("端口'%1$s'正在使用中！", commPort.getName()));
            }
        }
    }

    /**
     * @方法名称 :checkPort
     * @功能描述 :检查端口是否正确连接
     * @返回值类型 :void
     */
    private void checkPort() {
        if (commPort == null)
            throw new RuntimeException("没有选择端口，请使用 " + "selectPort(String portName) 方法选择端口");

        if (serialPort == null) {
            throw new RuntimeException("SerialPort 对象无效！");
        }
    }

    /**
     * @方法名称 :write
     * @功能描述 :向端口发送数据，请在调用此方法前 先选择端口，并确定SerialPort正常打开！
     * @返回值类型 :void
     * @param message
     */
    public void write(String message) {
        checkPort();

        try {
            outputStream = new BufferedOutputStream(serialPort.getOutputStream());
        } catch (IOException e) {
            throw new RuntimeException("获取端口的OutputStream出错：" + e.getMessage());
        }

        try {
            outputStream.write(message.getBytes("GBK"), 0, message.getBytes("GBK").length);
            //outputStream.write(message.getBytes());
            log("信息发送成功！"+new String(message.getBytes()));
        } catch (IOException e) {
            throw new RuntimeException("向端口发送信息时出错：" + e.getMessage());
        } finally {
            try {
                outputStream.close();
            } catch (Exception e) {
            }
        }
    }

    /**
     * @方法名称 :startRead
     * @功能描述 :开始监听从端口中接收的数据
     * @返回值类型 :void
     * @param time
     *            监听程序的存活时间，单位为秒，0 则是一直监听
     */
    public void startRead(int time) {
        checkPort();

        try {
            inputStream = new BufferedInputStream(serialPort.getInputStream());
        } catch (IOException e) {
            throw new RuntimeException("获取端口的InputStream出错：" + e.getMessage());
        }

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {
            throw new RuntimeException(e.getMessage());
        }

        serialPort.notifyOnDataAvailable(true);

        log(String.format("开始监听来自'%1$s'的数据--------------", commPort.getName()));
        if (time > 0) {
            this.threadTime = time * 1000;
            Thread t = new Thread(this);
            t.start();
            log(String.format("监听程序将在%1$d秒后关闭。。。。", threadTime));
        }
    }

    /**
     * @方法名称 :close
     * @功能描述 :关闭 SerialPort
     * @返回值类型 :void
     */
    public void close() {
        serialPort.close();
        serialPort = null;
        commPort = null;
    }

    public void log(String msg) {
        System.out.println(appName + " --> " + msg);
    }

    /**
     * 数据接收的监听处理函数
     */
    @Override
    public void serialEvent(SerialPortEvent arg0) {
        switch (arg0.getEventType()) {
        case SerialPortEvent.BI:/* Break interrupt,通讯中断 */
        case SerialPortEvent.OE:/* Overrun error，溢位错误 */
        case SerialPortEvent.FE:/* Framing error，传帧错误 */
        case SerialPortEvent.PE:/* Parity error，校验错误 */
        case SerialPortEvent.CD:/* Carrier detect，载波检测 */
        case SerialPortEvent.CTS:/* Clear to send，清除发送 */
        case SerialPortEvent.DSR:/* Data set ready，数据设备就绪 */
        case SerialPortEvent.RI:/* Ring indicator，响铃指示 */
        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:/*
                                                     * Output buffer is
                                                     * empty，输出缓冲区清空
                                                     */
            break;
        case SerialPortEvent.DATA_AVAILABLE:/*
                                             * Data available at the serial
                                             * port，端口有可用数据。读到缓冲数组，输出到终端
                                             */
            byte[] readBuffer = new byte[1024];
            String readStr = "";
            String s2 = "";

            try {

                while (inputStream.available() > 0) {
                    inputStream.read(readBuffer);
                    readStr += new String(readBuffer).trim();
                }

                s2 = new String(readBuffer).trim();

                log("接收到端口返回数据(长度为" + readStr.length() + ")：" + readStr);
                log(s2);
            } catch (IOException e) {
            }
        }
    }

    @Override
    public void run() {
        try {
            Thread.sleep(threadTime);
            serialPort.close();
            log(String.format("端口''监听关闭了！", commPort.getName()));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

  public static void main(String[] args) { 
      DSerialPort dp = new DSerialPort();
     dp.listPort();
     dp.selectPort("COM2");
     dp.write("我要报警啦");
     dp.startRead(30);

    
     }

}