当我尝试使用RXTX从串口com读取字符串缓冲区时，我得到了奇怪的结果。 在向COM写入字符串后，我将字符串存储为回复。这是一个循环。在控制台中打印的字符串有时不会与最后一个写入命令相对应，但属于前一个命令。
while (running) {
char campioni = (char) start;
hexStart = Integer.toHexString(campioni).toUpperCase();
String stringa = ">eL#" + hexStart + "??!\r\n" + "\n";
output.write((">eL" + "L#" + hexStart + "??!\r\n").getBytes());
output.flush();
byte[] buffer = new byte[10000];
n=0;
try {
n = input.read(buffer);
} catch (IOException e1) {
e1.printStackTrace();
}
if(n>0){
String data = new String (buffer,0,n);
System.out.println(new String(buffer));
start=start+5;
Thread.sleep(2000);
}
}
答案 0 :(得分：0)
我找到了两件你可以检查的东西
答案 1 :(得分：0)
以下示例是用户读取rfid阅读器扫描的Rfid值
1) Reader Form Build in netbeans
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package rfid_thumb;
import com.data.access.AbstractDao;
import gnu.io.SerialPort;
/**
*
* @author ANGEL
*/
public class ReaderForm extends javax.swing.JFrame {
/**
* Creates new form ReaderForm
*/
public AbstractDao abstractDao=new AbstractDao();
SerialPort serialPort, serialPort1;
//Communicator object
Communicator communicator = null;
//KeybindingController object
@Override
public void list() {
super.list(); //To change body of generated methods, choose Tools | Templates.
}
public ReaderForm() {
initComponents();
createObjects();
communicator.searchForPorts();
}
private void createObjects()
{
communicator = new Communicator(this);
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
thumbCobBox = new javax.swing.JComboBox();
jLabel6 = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
jScrollPane1 = new javax.swing.JScrollPane();
txtLog = new javax.swing.JTextArea();
jButton1 = new javax.swing.JButton();
Scan = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "RFID and Thumb Scanning", javax.swing.border.TitledBorder.DEFAULT_JUSTIFICATION, javax.swing.border.TitledBorder.DEFAULT_POSITION, new java.awt.Font("Verdana", 1, 14))); // NOI18N
jLabel6.setFont(new java.awt.Font("Verdana", 1, 12)); // NOI18N
jLabel6.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
jLabel6.setText("Thumb Scanning Port");
jLabel6.setOpaque(true);
jLabel7.setFont(new java.awt.Font("Verdana", 1, 12)); // NOI18N
jLabel7.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
jLabel7.setText("Logs");
jLabel7.setOpaque(true);
txtLog.setColumns(20);
txtLog.setRows(5);
jScrollPane1.setViewportView(txtLog);
jButton1.setText("Connect");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
Scan.setText("Scan");
Scan.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ScanActionPerformed(evt);
}
});
jButton3.setText("Enroll");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap(24, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 264, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 143, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 143, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(thumbCobBox, javax.swing.GroupLayout.PREFERRED_SIZE, 260, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 128, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(29, 29, 29)
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 117, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(Scan, javax.swing.GroupLayout.PREFERRED_SIZE, 128, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addGap(34, 34, 34))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap(37, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(thumbCobBox, javax.swing.GroupLayout.PREFERRED_SIZE, 49, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(13, 13, 13))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(Scan, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)))
.addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 117, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(31, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
communicator.connect();
if (communicator.getConnected() == true)
{
if (communicator.initIOStream() == true)
{
communicator.initListener();
}
}
}
private void ScanActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(ReaderForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ReaderForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ReaderForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ReaderForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ReaderForm().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton Scan;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton3;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JPanel jPanel1;
private javax.swing.JScrollPane jScrollPane1;
public javax.swing.JComboBox thumbCobBox;
public javax.swing.JTextArea txtLog;
// End of variables declaration
}
2）用于读取序列值的Communicator类
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package rfid_thumb;
import com.data.model.ThumbTemp;
import gnu.io.*;
import java.awt.Color;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.TooManyListenersException;
import java.util.Vector;
public class Communicator implements SerialPortEventListener
{
//passed from main GUI
ReaderForm window = null;
public Vector<String> inDataVector;
//for containing the ports that will be found
private Enumeration ports = null;
//map the port names to CommPortIdentifiers
private final HashMap portMap = new HashMap();
public int inData = 0, outData = 0, outData1 = 0;
//this is the object that contains the opened port
private final CommPortIdentifier selectedPortIdentifierT = null;
private SerialPort serialPort = null;
private SerialPort serialPortT = null;
String rfid="";
String thumb="";
private InputStream inputT = null;
private OutputStream outputT = null;
//just a boolean flag that i use for enabling
//and disabling buttons depending on whether the program
//is connected to a serial port or not
private boolean bConnected = false;
//the timeout value for connecting with the port
final static int TIMEOUT = 2000;
//some ascii values for for certain things
final static int SPACE_ASCII = 32;
final static int DASH_ASCII = 45;
final static int NEW_LINE_ASCII = 10;
public boolean dataReady=false, dataReady1=false, receivedPin=false;
//a string for recording what goes on in the program
//this string is written to the GUI
String logText = "";
public Communicator(ReaderForm window)
{
this.window = window;
inDataVector = new Vector<String>();
dataReady = false;
dataReady1 = false;
}
//search for all the serial ports
//pre: none
//post: adds all the found ports to a combo box on the GUI
public void searchForPorts()
{
ports = CommPortIdentifier.getPortIdentifiers();
while (ports.hasMoreElements())
{
CommPortIdentifier curPort = (CommPortIdentifier)ports.nextElement();
//get only serial ports
if (curPort.getPortType() == CommPortIdentifier.PORT_SERIAL)
{
//window.rfidComBox.addItem(curPort.getName());
window.thumbCobBox.addItem(curPort.getName());
portMap.put(curPort.getName(), curPort);
}
}
}
//connect to the selected port in the combo box
//pre: ports are already found by using the searchForPorts method
//post: the connected comm port is stored in commPort, otherwise,
//an exception is generated
public void connect()
{
//String selectedPort = (String)window.rfidComBox.getSelectedItem();
String selectedPortT = (String)window.thumbCobBox.getSelectedItem();
//selectedPortIdentifier = (CommPortIdentifier)portMap.get(selectedPort);
//selectedPortIdentifierT = (CommPortIdentifier)portMap.get(selectedPortT);
CommPort commPort = null;
CommPort commPortT = null;
try
{
//the method below returns an object of type CommPort
// commPort = selectedPortIdentifier.open("TigerControlPanel", TIMEOUT);
commPortT = selectedPortIdentifierT.open("TigerControlPanel1", TIMEOUT);
//the CommPort object can be casted to a SerialPort object
serialPort = (SerialPort)commPort;
serialPortT = (SerialPort)commPortT;
//for controlling GUI elements
setConnected(true);
//logging
logText = selectedPortT + " opened successfully.";
window.txtLog.setForeground(Color.black);
window.txtLog.append(logText + "\n");
//CODE ON SETTING BAUD RATE ETC OMITTED
//XBEE PAIR ASSUMED TO HAVE SAME SETTINGS ALREADY
//enables the controls on the GUI if a successful connection is made
//window.keybindingController.toggleControls();
}
catch (PortInUseException e)
{
logText = selectedPortT + " is in use. (" + e.toString() + ")";
window.txtLog.setForeground(Color.RED);
window.txtLog.append(logText + "\n");
}
catch (Exception e)
{
logText = "Failed to open " + selectedPortT + "(" + e.toString() + ")";
window.txtLog.append(logText + "\n");
window.txtLog.setForeground(Color.RED);
}
}
//open the input and output streams
//pre: an open port
//post: initialized intput and output streams for use to communicate data
public boolean initIOStream()
{
//return value for whather opening the streams is successful or not
boolean successful = false;
try {
//
//input = serialPort.getInputStream();
//output = serialPort.getOutputStream();
inputT = serialPortT.getInputStream();
outputT = serialPortT.getOutputStream();
//writeData(0, 0);
successful = true;
return successful;
}
catch (IOException e) {
logText = "I/O Streams failed to open. (" + e.toString() + ")";
window.txtLog.setForeground(Color.red);
window.txtLog.append(logText + "\n");
return successful;
}
}
//starts the event listener that knows whenever data is available to be read
//pre: an open serial port
//post: an event listener for the serial port that knows when data is recieved
public void initListener()
{
try
{
//serialPort.addEventListener(this);
//serialPort.notifyOnDataAvailable(true);
serialPortT.addEventListener(this);
serialPortT.notifyOnDataAvailable(true);
}
catch (TooManyListenersException e)
{
logText = "Too many listeners. (" + e.toString() + ")";
window.txtLog.setForeground(Color.red);
window.txtLog.append(logText + "\n");
}
}
//disconnect the serial port
//pre: an open serial port
//post: clsoed serial port
public void disconnect()
{
//close the serial port
try
{
serialPort.removeEventListener();
serialPort.close();
serialPortT.removeEventListener();
serialPortT.close();
//input.close();
//output.close();
inputT.close();
outputT.close();
setConnected(false);
//window.keybindingController.toggleControls();
logText = "Disconnected.";
window.txtLog.setForeground(Color.red);
window.txtLog.append(logText + "\n");
}
catch (Exception e)
{
logText = "Failed to close " + serialPort.getName() + "(" + e.toString() + ")";
window.txtLog.setForeground(Color.red);
window.txtLog.append(logText + "\n");
}
}
final public boolean getConnected()
{
return bConnected;
}
public void setConnected(boolean bConnected)
{
this.bConnected = bConnected;
}
//what happens when data is received
//pre: serial event is triggered
//post: processing on the data it reads
public void serialEvent(SerialPortEvent evt) {
if (evt.getEventType() == SerialPortEvent.DATA_AVAILABLE)
{
try
{
while (inputT.available() > 0) {
inData = inputT.read();
//inDataVector.add(new String("" + (char) inData));
System.out.print(new String("" + (char) inData));
thumb+=new String("" + (char) inData);
ThumbTemp thumbTemp=(ThumbTemp)window.abstractDao.getById("id", 1, ThumbTemp.class);
if(thumb.length()==100){
thumbTemp.setValue(thumb.split("#")[1].substring(0,2));
window.abstractDao.update(thumbTemp);
window.txtLog.append("Thumb Id : "+thumb+"\n");
thumb="";
}
else
{
thumbTemp.setValue("none");
//window.abstractDao.update("");
}
window.abstractDao.update(thumbTemp);
}
//rfid="";
}
catch (Exception e)
{
logText = "Failed to read data. (" + e.toString() + ")";
window.txtLog.setForeground(Color.red);
window.txtLog.append(logText + "\n");
}
}
}
//method that can be called to send data
//pre: open serial port
//post: data sent to the other device
public void writeData(int id)
{
try
{
outputT.write(id);
}
catch (Exception e)
{
logText = "Failed to write data. (" + e.toString() + ")";
window.txtLog.setForeground(Color.red);
window.txtLog.append(logText + "\n");
}
}
}