在我的代码下面，我为 gps 编写的代码是给我关于 4800 波特率的继续数据，此数据显示由“System.out.println(st)”继续显示，但相同的数据不会显示在 a.setText(st) 中，其中 a 是文本框变量。有些人知道如何像 System.out.println 行那样更新我的文本框。
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Enumeration;
import java.util.TooManyListenersException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.comm.UnsupportedCommOperationException;
import javax.comm.*;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/*
* test.java
*
* Created on Mar 11, 2013, 9:08:52 AM
*/
/**
*
* @author DJ ROCKS
*/
public class test extends javax.swing.JFrame {
public boolean bp=true;
/** Creates new form test */
public test() {
initComponents();
}
/** 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() {
ok = new javax.swing.JButton();
a = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
ok.setText("ok");
ok.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
okActionPerformed(evt);
}
});
a.setText(" ");
a.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
aActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(62, 62, 62)
.addComponent(a, javax.swing.GroupLayout.PREFERRED_SIZE, 394, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(238, 238, 238)
.addComponent(ok)))
.addContainerGap(124, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(a, javax.swing.GroupLayout.PREFERRED_SIZE, 39, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(67, 67, 67)
.addComponent(ok)
.addContainerGap(160, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void okActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
if(evt.getSource()==ok)
{
CommPortIdentifier portId = null;
String wantedPortName="COM16";
Enumeration portIdentifiers = CommPortIdentifier.getPortIdentifiers();
while(portIdentifiers.hasMoreElements())
{
CommPortIdentifier pid = (CommPortIdentifier) portIdentifiers.nextElement();
if(pid.getPortType() == CommPortIdentifier.PORT_SERIAL &&
pid.getName().equals(wantedPortName))
{
portId = pid;
break;
}
}
if(portId == null)
{
System.err.println("Could not find serial port " + wantedPortName);
System.exit(1);
}
else
{
System.out.println("system find gps reciever");
}
SerialPort port = null;
try {
port = (SerialPort) portId.open(
"RMC",
1);
System.out.println("all are ok");
} catch(PortInUseException e) {
System.err.println("Port already in use: " + e);
System.exit(1);
}
try {
//int i=Integer.parseInt(new vps().baud_rate.getItemAt(new vps().baud_rate.getItemCount()));
port.setSerialPortParams(
4800,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
} catch (UnsupportedCommOperationException ex) {
Logger.getLogger(test.class.getName()).log(Level.SEVERE, null, ex);
}
BufferedReader is = null;
try {
is = new BufferedReader(new InputStreamReader(port.getInputStream()));
System.out.println("data is ok");
} catch (IOException e) {
System.err.println("Can't open input stream: write-only");
is = null;
}
//this is variable is ouside of class and define by public it work
while(true)
{
String st = null;
try {
st = is.readLine();
} catch (IOException ex) {
Logger.getLogger(test.class.getName()).log(Level.SEVERE, null, ex);
}
System.out.println(st);
//st = st.replace(st, "");
a.setText(st);
try
{
Thread.sleep(1000);
}
catch(InterruptedException ie)
{
System.out.printf(ie.getMessage());
}
}
/*if (is != null) try {
is.close();
} catch (IOException ex) {
Logger.getLogger(test.class.getName()).log(Level.SEVERE, null, ex);
}
if (port != null) port.close();
*/
}
}
private void aActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new test().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextField a;
private javax.swing.JButton ok;
// End of variables declaration
}