Java连接串口代码

Posted 2023-02-17 TaiJi1985

类库和实例程序下载

https://download.csdn.net/download/TaiJi1985/12538399

代码

import java.util.ArrayList;

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

public class DemoSP 
	public static void main(String[] args) throws Exception 
		ArrayList<String> ret = SerialPortUtil.findPort();
		for(String string : ret)
			System.out.println(string);
		
		
		
		SerialPort p1 = SerialPortUtil.openPort("COM1", 9600, 8, 0, 1);
		
		SerialPortUtil.sendToPort(p1, "hello".getBytes());
		SerialPortUtil.addListener(p1, new SerialPortEventListener() 
			
			@Override
			public void serialEvent(SerialPortEvent e) 
				System.out.println(e.getEventType());
				if(SerialPortEvent.DATA_AVAILABLE != e.getEventType())return;
				try 
					byte[] a = SerialPortUtil.readFromPort(p1);
					System.out.println(new String(a));
				 catch (Exception e1) 
					e1.printStackTrace();
				
				
			
		);
	

下面这个类库是从互联网获取的帮助类

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.TooManyListenersException;

import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.NoSuchPortException;
import gnu.io.PortInUseException;
import gnu.io.SerialPort;
import gnu.io.SerialPortEventListener;
import gnu.io.UnsupportedCommOperationException;

/**
 * 模块名称：projects-parent com.yotrio.common
 * 功能说明：串口服务类，提供打开、关闭串口，读取、发送串口数据等服务（采用单例设计模式）
 * <br>
 * 开发人员：Wangyq 
 * 创建时间： 2018-09-20 10:05
 * 系统版本：1.0.0
 **/

public class SerialPortUtil 

    private static SerialPortUtil serialPortUtil = null;

    static 
        //在该类被ClassLoader加载时就初始化一个SerialTool对象
        if (serialPortUtil == null) 
            serialPortUtil = new SerialPortUtil();
        
    

    //私有化SerialTool类的构造方法，不允许其他类生成SerialTool对象
    private SerialPortUtil() 
    

    /**
     * 获取提供服务的SerialTool对象
     *
     * @return serialPortUtil
     */
    public static SerialPortUtil getSerialPortUtil() 
        if (serialPortUtil == null) 
            serialPortUtil = new SerialPortUtil();
        
        return serialPortUtil;
    


    /**
     * 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
        Enumeration<CommPortIdentifier> portList = CommPortIdentifier.getPortIdentifiers();

        ArrayList<String> portNameList = new ArrayList<>();

        //将可用串口名添加到List并返回该List
        while (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
     * @param databits 数据位
     * @param parity   校验位（奇偶位）
     * @param stopbits 停止位
     * @return 串口对象
     * @throws SerialPortParameterFailure 设置串口参数失败
     * @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, int databits, int parity, int stopbits) throws Exception 

        try 
            //通过端口名识别端口
            CommPortIdentifier 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 commPort = portIdentifier.open(portName, 2000);

            //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等参数
                    serialPort.setSerialPortParams(baudrate, databits, stopbits, parity);
                 catch (UnsupportedCommOperationException e) 
                    throw new Exception("unsupported operation ");
                

                //System.out.println("Open " + portName + " sucessfully !");
                return serialPort;
             else 
                //不是串口
                throw new Exception("no port ");
            
         catch (NoSuchPortException e1) 
            throw new Exception("no such port ");
         catch (PortInUseException e2) 
            throw new Exception(" port in use ");
        
    

    /**
     * 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) throws Exception 
        OutputStream out = null;
        try 
            out = serialPort.getOutputStream();
            out.write(order);
            out.flush();
         catch (IOException e) 
            throw new Exception("send fail");
         finally 
            try 
                if (out != null) 
                    out.close();
                    out = null;
                
             catch (IOException e) 
               
            
        
    

    /**
     * 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) throws Exception 

        InputStream in = null;
        byte[] bytes = null;

        try 
            in = serialPort.getInputStream();
            int bufflenth = in.available();        //获取buffer里的数据长度

            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) 
            throw new Exception("read fail");
         finally 
            try 
                if (in != null) 
                    in.close();
                    in = null;
                
             catch (IOException e) 
            
        

        return bytes;

    

    /**
     * 添加监听器
     *
     * @param port     串口对象
     * @param listener 串口监听器
     * @throws TooManyListeners 监听类对象过多
     */
    public static void addListener(SerialPort port, SerialPortEventListener listener) throws Exception 

        try 
            //给串口添加监听器
            port.addEventListener(listener);
            //设置当有数据到达时唤醒监听接收线程
            port.notifyOnDataAvailable(true);
            //设置当通信中断时唤醒中断线程
            port.notifyOnBreakInterrupt(true);
         catch (TooManyListenersException e) 
            throw new Exception("too many listeners");
        
    

    /**
     * 删除监听器
     *
     * @param port     串口对象
     * @param listener 串口监听器
     * @throws TooManyListeners 监听类对象过多
     */
    public static void removeListener(SerialPort port, SerialPortEventListener listener) 
        //删除串口监听器
        port.removeEventListener();
    


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