/****************************************** *　程序文件名稱：ReadComm.java * 功能：從串行口COM1中接收數(shù)據(jù) ******************************************/import java.awt.event.*;import java.io.*;import java.util.*;import javax.comm.*;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextArea;import javax.swing.JTextField;class R_Frame extends JFrame implements Runnable, ActionListener,		SerialPortEventListener {	/* 檢測系統(tǒng)中可用的通訊端口類 */	static CommPortIdentifier portId;	/* Enumeration 為枚舉型類,在java.util中 */	static Enumeration portList;	InputStream inputStream;	/* 聲明RS-232串行端口的成員變量 */	SerialPort serialPort;	/** 讀取串口線程 */	Thread readThread;	/** 寫串口線程 */	Thread writeThread;		JPanel panOut = new JPanel();	JPanel panIn = new JPanel();	JPanel panBtn = new JPanel();		String str = "";	JTextField txtInmessage = new JTextField("上面文本框顯示接收到的數(shù)據(jù)");	JTextArea txtArea_In = new JTextArea();	JTextField txtOutmessage = new JTextField("上面文本框顯示發(fā)送的數(shù)據(jù)");	JTextArea txtArea_Out = new JTextArea();	JButton btnOpen = new JButton("打開串口");	JButton btnClose = new JButton("關(guān)閉串口");	JButton btnSend = new JButton("發(fā)送數(shù)據(jù)");	//發(fā)送數(shù)據(jù)變量	byte data[] = new byte[10240];	OutputStream outputStream;	/* 建立窗體 */	R_Frame() {		this.getContentPane().setLayout(null);				panBtn.setLayout(null);		panBtn.setBounds(0,0,300,30);		panBtn.add(btnOpen);		panBtn.add(btnClose);		panBtn.add(btnSend);		btnOpen.setBounds(0, 0, 100, 30);		btnClose.setBounds(100, 0, 100, 30);		btnSend.setBounds(200, 0, 100, 30);		this.getContentPane().add(panBtn);						btnOpen.addActionListener(this);		btnClose.addActionListener(this);		btnSend.addActionListener(this);				//發(fā)送區(qū)域		panOut.setLayout(null);		panOut.setBounds(0,30,300,200);		txtArea_Out.setBounds(0,0,300,180);		txtOutmessage.setBounds(0,180,300,20);		panOut.add(txtArea_Out);		panOut.add(txtOutmessage);				this.getLayeredPane().add(panOut);		//接受區(qū)域		panIn.setLayout(null);		panIn.setBounds(0,230,300,200);		txtArea_In.setBounds(0,0,300,180);		txtInmessage.setBounds(0,180,300,20);		panIn.add(txtArea_In);		panIn.add(txtInmessage);				this.getLayeredPane().add(panIn);			} // R_Frame() end	/* 點擊按扭所觸發(fā)的事件：打開串口,并監(jiān)聽串口. */	public void actionPerformed(ActionEvent event) {		if(event.getSource().equals(btnOpen)) {			//讀取用戶配置端口名稱			String portName = ConfigFile.findProperty("CommPort");			/* 獲取系統(tǒng)中所有的通訊端口 */			portList = CommPortIdentifier.getPortIdentifiers();			/* 用循環(huán)結(jié)構(gòu)找出串口 */			while (portList.hasMoreElements()) {				/* 強(qiáng)制轉(zhuǎn)換為通訊端口類型 */				portId = (CommPortIdentifier) portList.nextElement();				if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {					if (portId.getName().equals(portName)) {						try {							serialPort = (SerialPort) portId.open("ReadComm", 2000);							txtInmessage.setText("已打開端口COM1 ,正在接收數(shù)據(jù)..... ");						} catch (PortInUseException e) {						}						/* 設(shè)置串口監(jiān)聽器 */						try {							serialPort.addEventListener(this);						} catch (TooManyListenersException e) {						}						/* 偵聽到串口有數(shù)據(jù),觸發(fā)串口事件 */						serialPort.notifyOnDataAvailable(true);												/* 設(shè)置串口輸出流 */						try {							outputStream = serialPort.getOutputStream();						} catch (IOException e) {						}					} // if end				} // if end			} // while end			readThread = new Thread(this);			readThread.start(); // 線程負(fù)責(zé)每接收一次數(shù)據(jù)休眠20秒鐘					}		if(event.getSource().equals(btnClose)){						if(serialPort!=null) {				serialPort.close();				txtInmessage.setText("端口已關(guān)閉");			}		}		if(event.getSource().equals(btnSend)){			/* 設(shè)置串口通訊參數(shù) */			try {				serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,						SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);			} catch (UnsupportedCommOperationException e) {			}			/* 從文本區(qū)按字節(jié)讀取數(shù)據(jù) */			data = txtArea_Out.getText().getBytes();			/* 發(fā)送數(shù)據(jù)流(將數(shù)組data[]中的數(shù)據(jù)發(fā)送出去) */			try {				outputStream.write(data);			} catch (IOException e) {			}		}			} // actionPerformed() end	/* 接收數(shù)據(jù)后休眠20秒鐘 */	public void run() {		try {			Thread.sleep(20000);		} catch (InterruptedException e) {		}	} // run() end	/* 串口監(jiān)聽器觸發(fā)的事件，設(shè)置串口通訊參數(shù)，讀取數(shù)據(jù)并寫到文本區(qū)中 */	public void serialEvent(SerialPortEvent event) {		/* 設(shè)置串口通訊參數(shù)：波特率、數(shù)據(jù)位、停止位、奇偶校驗 */		try {			serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,					SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);		} catch (UnsupportedCommOperationException e) {		}		byte[] readBuffer = new byte[20];		try {			inputStream = serialPort.getInputStream();		} catch (IOException e) {		}		try {			/* 從線路上讀取數(shù)據(jù)流 */			while (inputStream.available() > 0) {				int numBytes = inputStream.read(readBuffer);			} // while end			str = new String(readBuffer);			/* 接收到的數(shù)據(jù)存放到文本區(qū)中 */			txtArea_In.append(str + "\n");		} catch (IOException e) {		}	} // serialEvent() end} // 類R_Frame endpublic class ReadComm {	public static void main(String args[]) {		R_Frame frame = new R_Frame();		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);		frame.setResizable(false); //設(shè)置窗口為固定大小		frame.setSize(300,460);  		frame.setLocation(200, 200);		frame.setVisible(true);			}}