最終效果如下圖： 
1、把rxtxParallel.dll、rxtxSerial.dll拷貝到：C:/WINDOWS/system32下。 2、RXTXcomm.jar 添加到項目類庫中。
package serialPort;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.ArrayList;import java.util.Enumeration;import java.util.List;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;/**串口服務類，提供打開、關閉串口，讀取、發送串口數據等服務 */public class SerialTool { PRivate static SerialTool serialTool = null; static { //在該類被ClassLoader加載時就初始化一個SerialTool對象 if (serialTool == null) { serialTool = new SerialTool(); } } //私有化SerialTool類的構造方法，不允許其他類生成SerialTool對象 private SerialTool() {} /** * 獲取提供服務的SerialTool對象 * @return serialTool */ public static SerialTool getSerialTool() { if (serialTool == null) { serialTool = new SerialTool(); } return serialTool; } /** * 查找所有可用端口 * @return 可用端口名稱列表 */ public static final List<String> findPort() { //獲得當前所有可用串口 @SuppressWarnings("unchecked") Enumeration<CommPortIdentifier> portList = CommPortIdentifier.getPortIdentifiers(); List<String> portNameList = new ArrayList<>(); //將可用串口名添加到List并返回該List while (portList.hasMoreElements()) { String portName = portList.nextElement().getName(); portNameList.add(portName); } return portNameList; } /** * 打開串口 * @param portName 端口名稱 * @param baudrate 波特率 * @return 串口對象 * @throws UnsupportedCommOperationException * @throws PortInUseException * @throws NoSuchPortException */ public static final SerialPort openPort(String portName, int baudrate) throws UnsupportedCommOperationException, PortInUseException, NoSuchPortException { //通過端口名識別端口 CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName); //打開端口，并給端口名字和一個timeout（打開操作的超時時間） CommPort commPort = portIdentifier.open(portName, 2000); //判斷是不是串口 if (commPort instanceof SerialPort) { SerialPort serialPort = (SerialPort) commPort; //設置一下串口的波特率等參數 serialPort.setSerialPortParams(baudrate, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); return serialPort; } return null; } /** * 關閉串口 * @param serialport 待關閉的串口對象 */ public static void closePort(SerialPort serialPort) { if (serialPort != null) { serialPort.close(); serialPort = null; } } /** * 往串口發送數據 * @param serialPort 串口對象 * @param order 待發送數據 * @throws IOException */ public static void sendToPort(SerialPort serialPort, byte[] order) throws IOException { OutputStream out = null; out = serialPort.getOutputStream(); out.write(order); out.flush(); out.close(); } /** * 從串口讀取數據 * @param serialPort 當前已建立連接的SerialPort對象 * @return 讀取到的數據 * @throws IOException */ public static byte[] readFromPort(SerialPort serialPort) throws IOException { InputStream in = null; byte[] bytes = null; try { in = serialPort.getInputStream(); int bufflenth = in.available(); //獲取buffer里的數據長度 while (bufflenth != 0) { bytes = new byte[bufflenth]; //初始化byte數組為buffer中數據的長度 in.read(bytes); bufflenth = in.available(); } } catch (IOException e) { throw e; } finally { if (in != null) { in.close(); in = null; } } return bytes; } /**添加監聽器 * @param port 串口對象 * @param listener 串口監聽器 * @throws TooManyListenersException */ public static void addListener(SerialPort port, SerialPortEventListener listener) throws TooManyListenersException { //給串口添加監聽器 port.addEventListener(listener); //設置當有數據到達時喚醒監聽接收線程 port.notifyOnDataAvailable(true); //設置當通信中斷時喚醒中斷線程 port.notifyOnBreakInterrupt(true); }}package serialPort;import java.awt.Color;import java.awt.Font;import java.awt.Image;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.io.IOException;import java.time.Instant;import java.time.LocalDateTime;import java.time.ZoneId;import java.time.format.DateTimeFormatter;import java.util.List;import java.util.Timer;import java.util.TimerTask;import java.util.TooManyListenersException;import javax.swing.JButton;import javax.swing.JComboBox;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.border.TitledBorder;import gnu.io.NoSuchPortException;import gnu.io.PortInUseException;import gnu.io.SerialPort;import gnu.io.SerialPortEvent;import gnu.io.SerialPortEventListener;import gnu.io.UnsupportedCommOperationException;/** * 監測數據顯示類 * @author Zhong * */public class SerialView extends JFrame { /** */ private static final long serialVersionUID = 1L; //設置window的icon Toolkit toolKit = getToolkit(); Image icon = toolKit.getImage(SerialView.class.getResource("computer.png")); DateTimeFormatter df= DateTimeFormatter.ofPattern("YYYY-MM-dd HH:mm:ss.SSS"); private JComboBox<String> commChoice; private JComboBox<String> bpsChoice; private JButton openSerialButton; private JButton sendButton; private JTextArea sendArea; private JTextArea receiveArea; private JButton closeSerialButton; private List<String> commList = null; //保存可用端口號 private SerialPort serialPort = null; //保存串口對象 /**類的構造方法 * @param client */ public SerialView() { init(); TimerTask task = new TimerTask() { @Override public void run() { commList = SerialTool.findPort(); //程序初始化時就掃描一次有效串口 //檢查是否有可用串口，有則加入選項中 if (commList == null || commList.size()<1) { JOptionPane.showMessageDialog(null, "沒有搜索到有效串口！", "錯誤", JOptionPane.INFORMATION_MESSAGE); }else{ commChoice.removeAllItems(); for (String s : commList) { commChoice.addItem(s); } } } }; Timer timer = new Timer(); timer.scheduleAtFixedRate(task, 0, 10000); listen(); } /** */ private void listen(){ //打開串口連接 openSerialButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { //獲取串口名稱 String commName = (String) commChoice.getSelectedItem(); //獲取波特率 String bpsStr = (String) bpsChoice.getSelectedItem(); //檢查串口名稱是否獲取正確 if (commName == null || commName.equals("")) { JOptionPane.showMessageDialog(null, "沒有搜索到有效串口！", "錯誤", JOptionPane.INFORMATION_MESSAGE); }else { //檢查波特率是否獲取正確 if (bpsStr == null || bpsStr.equals("")) { JOptionPane.showMessageDialog(null, "波特率獲取錯誤！", "錯誤", JOptionPane.INFORMATION_MESSAGE); }else { //串口名、波特率均獲取正確時 int bps = Integer.parseInt(bpsStr); try { //獲取指定端口名及波特率的串口對象 serialPort = SerialTool.openPort(commName, bps); SerialTool.addListener(serialPort, new SerialListener()); if(serialPort==null) return; //在該串口對象上添加監聽器 closeSerialButton.setEnabled(true); sendButton.setEnabled(true); openSerialButton.setEnabled(false); String time=df.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(System.currentTimeMillis()),ZoneId.of("Asia/Shanghai"))); receiveArea.append(time+" ["+serialPort.getName().split("/")[3]+"] : "+" 連接成功..."+"/r/n"); receiveArea.setCaretPosition(receiveArea.getText().length()); } catch (UnsupportedCommOperationException | PortInUseException | NoSuchPortException | TooManyListenersException e1) { e1.printStackTrace(); } } } } }); //發送數據 sendButton.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { if(!sendButton.isEnabled())return; String message= sendArea.getText(); //"FE0400030001D5C5" try { SerialTool.sendToPort(serialPort, hex2byte(message)); } catch (IOException e1) { e1.printStackTrace(); } } }); //關閉串口連接 closeSerialButton.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { if(!closeSerialButton.isEnabled())return; SerialTool.closePort(serialPort); String time=df.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(System.currentTimeMillis()),ZoneId.of("Asia/Shanghai"))); receiveArea.append(time+" ["+serialPort.getName().split("/")[3]+"] : "+" 斷開連接"+"/r/n"); receiveArea.setCaretPosition(receiveArea.getText().length()); openSerialButton.setEnabled(true); closeSerialButton.setEnabled(false); sendButton.setEnabled(false); } }); } /** * 主菜單窗口顯示； * 添加JLabel、按鈕、下拉條及相關事件監聽； */ private void init() { this.setBounds(WellcomView.LOC_X, WellcomView.LOC_Y, WellcomView.WIDTH, WellcomView.HEIGHT); this.setTitle("串口調試"); this.setIconImage(icon); this.setBackground(Color.gray); this.setLayout(null); Font font =new Font("微軟雅黑", Font.BOLD, 16); receiveArea=new JTextArea(18, 30); receiveArea.setEditable(false); JScrollPane receiveScroll = new JScrollPane(receiveArea); receiveScroll.setBorder(new TitledBorder("接收區")); //滾動條自動出現 FE0400030001D5C5 receiveScroll.setHorizontalScrollBarPolicy( JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED); receiveScroll.setVerticalScrollBarPolicy( JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED); receiveScroll.setBounds(52, 20, 680,340); this.add(receiveScroll); JLabel chuankou=new JLabel(" 串口選擇： "); chuankou.setFont(font); chuankou.setBounds(50, 380, 100,50); this.add(chuankou); JLabel botelv=new JLabel(" 波 特 率： "); botelv.setFont(font); botelv.setBounds(290, 380, 100,50); this.add(botelv); //添加串口選擇選項 commChoice = new JComboBox<String>(); //串口選擇（下拉框） commChoice.setBounds(145, 390, 100, 30); this.add(commChoice); //添加波特率選項 bpsChoice = new JComboBox<String>(); //波特率選擇 bpsChoice.setBounds(380, 390, 100, 30); bpsChoice.addItem("1500"); bpsChoice.addItem("2400"); bpsChoice.addItem("4800"); bpsChoice.addItem("9600"); bpsChoice.addItem("14400"); bpsChoice.addItem("19500"); bpsChoice.addItem("115500"); this.add(bpsChoice); //添加打開串口按鈕 openSerialButton = new JButton("連接"); openSerialButton.setBounds(540, 390, 80, 30); openSerialButton.setFont(font); openSerialButton.setForeground(Color.darkGray); this.add(openSerialButton); //添加關閉串口按鈕 closeSerialButton = new JButton("關閉"); closeSerialButton.setEnabled(false); closeSerialButton.setBounds(650, 390, 80, 30); closeSerialButton.setFont(font); closeSerialButton.setForeground(Color.darkGray); this.add(closeSerialButton); sendArea=new JTextArea(30,20); JScrollPane sendScroll = new JScrollPane(sendArea); sendScroll.setBorder(new TitledBorder("發送區")); //滾動條自動出現 sendScroll.setHorizontalScrollBarPolicy( JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); sendScroll.setVerticalScrollBarPolicy( JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); sendScroll.setBounds(52, 450, 500,100); this.add(sendScroll); sendButton = new JButton("發 送"); sendButton.setBounds(610, 520, 120, 30); sendButton.setFont(font); sendButton.setForeground(Color.darkGray); sendButton.setEnabled(false); this.add(sendButton); this.setResizable(false); //窗口大小不可更改 this.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE); this.setVisible(true); } /**字符串轉16進制 * @param hex * @return */ private byte[] hex2byte(String hex) { String digital = "0123456789ABCDEF"; String hex1 = hex.replace(" ", ""); char[] hex2char = hex1.toCharArray(); byte[] bytes = new byte[hex1.length() / 2]; byte temp; for (int p = 0; p < bytes.length; p++) { temp = (byte) (digital.indexOf(hex2char[2 * p]) * 16); temp += digital.indexOf(hex2char[2 * p + 1]); bytes[p] = (byte) (temp & 0xff); } return bytes; } /**字節數組轉16進制 * @param b * @return */ private String printHexString(byte[] b) { StringBuffer sbf=new StringBuffer(); for (int i = 0; i < b.length; i++) { String hex = Integer.toHexString(b[i] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; } sbf.append(hex.toUpperCase()+" "); } return sbf.toString().trim(); } /** * 以內部類形式創建一個串口監聽類 * @author zhong */ class SerialListener implements SerialPortEventListener { /** * 處理監控到的串口事件 */ public void serialEvent(SerialPortEvent serialPortEvent) { switch (serialPortEvent.getEventType()) { case SerialPortEvent.BI: // 10 通訊中斷 JOptionPane.showMessageDialog(null, "與串口設備通訊中斷", "錯誤", JOptionPane.INFORMATION_MESSAGE); break; case SerialPortEvent.OE: // 7 溢位（溢出）錯誤 break; case SerialPortEvent.FE: // 9 幀錯誤 break; case SerialPortEvent.PE: // 8 奇偶校驗錯誤 break; case SerialPortEvent.CD: // 6 載波檢測 break; case SerialPortEvent.CTS: // 3 清除待發送數據 break; case SerialPortEvent.DSR: // 4 待發送數據準備好了 break; case SerialPortEvent.RI: // 5 振鈴指示 break; case SerialPortEvent.OUTPUT_BUFFER_EMPTY: // 2 輸出緩沖區已清空 break; case SerialPortEvent.DATA_AVAILABLE: // 1 串口存在可用數據 String time=df.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(System.currentTimeMillis()),ZoneId.of("Asia/Shanghai"))); byte[] data;//FE0400030001D5C5 try { data = SerialTool.readFromPort(serialPort); receiveArea.append(time+" ["+serialPort.getName().split("/")[3]+"] : "+ printHexString(data)+"/r/n"); receiveArea.setCaretPosition(receiveArea.getText().length()); } catch (IOException e) { e.printStackTrace(); } break; default: break; } } }}package serialPort;import java.awt.Color;import java.awt.Font;import java.awt.Image;import java.awt.Toolkit;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import javax.swing.JFrame;import javax.swing.JLabel;/** * @author bh * 如果運行過程中拋出 java.lang.UnsatisfiedLinkError 錯誤， * 請將rxtx解壓包中的 rxtxParallel.dll，rxtxSerial.dll 這兩個文件復制到 C:/Windows/System32 目錄下即可解決該錯誤。 */public class WellcomView { /** 程序界面寬度*/ public static final int WIDTH = 800; /** 程序界面高度*/ public static final int HEIGHT = 620; /** 程序界面出現位置（橫坐標） */ public static final int LOC_X = 200; /** 程序界面出現位置（縱坐標）*/ public static final int LOC_Y = 70; private JFrame jFrame; /**主方法 * @param args // */ public static void main(String[] args) { new WellcomView(); } public WellcomView() { init(); listen(); } /** */ private void listen() { //添加鍵盤監聽器 jFrame.addKeyListener(new KeyAdapter() { public void keyReleased(KeyEvent e) { int keyCode = e.getKeyCode(); if (keyCode == KeyEvent.VK_ENTER) { //當監聽到用戶敲擊鍵盤enter鍵后執行下面的操作 jFrame.setVisible(false); //隱去歡迎界面 new SerialView(); //主界面類（顯示監控數據主面板） } } }); } /** * 顯示主界面 */ private void init() { jFrame=new JFrame("串口調試"); jFrame.setBounds(LOC_X, LOC_Y, WIDTH, HEIGHT); //設定程序在桌面出現的位置 jFrame.setLayout(null); //設置window的icon（這里我自定義了一下Windows窗口的icon圖標，因為實在覺得哪個小咖啡圖標不好看 = =） Toolkit toolKit = jFrame.getToolkit(); Image icon = toolKit.getImage(WellcomView.class.getResource("computer.png")); jFrame.setIconImage(icon); jFrame.setBackground(Color.white); //設置背景色 JLabel huanyin=new JLabel("歡迎使用串口調試工具"); huanyin.setBounds(170, 80,600,50); huanyin.setFont(new Font("微軟雅黑", Font.BOLD, 40)); jFrame.add(huanyin); JLabel banben=new JLabel("Version：1.0 Powered By：cyq"); banben.setBounds(180, 390,500,50); banben.setFont(new Font("微軟雅黑", Font.ITALIC, 26)); jFrame.add(banben); JLabel enter=new JLabel("————點擊Enter鍵進入主界面————"); enter.setBounds(100, 480,600,50); enter.setFont(new Font("微軟雅黑", Font.BOLD, 30)); jFrame.add(enter); jFrame.setResizable(false); //窗口大小不可更改 jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); jFrame.setVisible(true); //顯示窗口 }}新聞熱點
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