Drawing a color string with swing and Graphics2D
hi guys,
I am trying to draw a string on a JPanel, and can do so successfully with plain boring text using drawString(string, int, int). How can I change the font and color? Thanks!
Read the API for java.awt.Graphics.
db
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RG wrote:
Hello,
I need to search a string with quote and without quote the same way
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Hi all, ;)
First of all, sorry about my poor English.
I have a problem with Swing and Threads, I hope you help me (because I'm in the firsts two weeks in my new job)
I have two classes:
Form1: Its a JPanel class with JProgressBar and JLabel inside.
FormularioApplet: (the main) Its a JPanel class with a form1 inside.
I have to download a file from a server and show the progress of the download in the JProgressBar. To make it I do this:
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The execution of FormularioApplet finishes before the Thread of Form1 (with download the file) download the file. Then, when I call in FormularioApplet the variable with the file an Exception: Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException is generated.
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I put in bold the important lines.
Note: My level of JAVA, you can see, is not elevated.
THANKS A LOT
Form1 class:
package es.cambrabcn.signer.gui;
import java.awt.HeadlessException;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.StringTokenizer;
import java.util.Vector;
import javax.swing.SwingUtilities;
public class Form1 extends javax.swing.JPanel {
//Variables relacionadas con la clase original DownloadProgressBar
private InputStream file;
private int totalCicles;
private int totalFiles;
private int currentProgress;
private SwingWorker worker;
private ByteArrayOutputStream byteArray;
private boolean done;
/** Creates new form prueba */
public Form1() {
initComponents();
this.byteArray = new ByteArrayOutputStream();
progressBar.setStringPainted(true);
//this.totalFiles = totalFiles;
currentProgress = 0;
/** 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.
// <editor-fold defaultstate="collapsed" desc=" C�digo Generado ">
private void initComponents() {
label1 = new javax.swing.JLabel();
progressBar = new javax.swing.JProgressBar();
statusLabel = new javax.swing.JLabel();
setBackground(new java.awt.Color(255, 255, 255));
setMaximumSize(new java.awt.Dimension(300, 150));
setMinimumSize(new java.awt.Dimension(300, 150));
setPreferredSize(new java.awt.Dimension(300, 150));
label1.setFont(new java.awt.Font("Arial", 1, 18));
label1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
label1.setText("Barra de progreso");
statusLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
statusLabel.setText("Cargando");
org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
.add(org.jdesktop.layout.GroupLayout.LEADING, statusLabel, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 280, Short.MAX_VALUE)
.add(org.jdesktop.layout.GroupLayout.LEADING, progressBar, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 280, Short.MAX_VALUE)
.add(org.jdesktop.layout.GroupLayout.LEADING, label1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 280, Short.MAX_VALUE))
.addContainerGap())
layout.setVerticalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
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.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(statusLabel)
.addContainerGap(73, Short.MAX_VALUE))
}// </editor-fold>
// Declaraci�n de variables - no modificar
private javax.swing.JLabel label1;
private javax.swing.JProgressBar progressBar;
private javax.swing.JLabel statusLabel;
// Fin de declaraci�n de variables
public byte[] getDownloadedFile(String documentToSign){
//Variables locales
byte puente[] = null;
try{
//Leemos el documento a firmar
StringTokenizer st = new StringTokenizer(documentToSign, ";");
Vector<URL> fileURL = new Vector<URL>();
HttpSender sender = new HttpSender(null);
//Introducimos la lista de URLs de archivos a bajar en el objeto Vector
for(; st.hasMoreTokens(); fileURL.add(new URL(st.nextToken())));
//Para cada URL descargaremos un archivo
for(int i = 0; i < fileURL.size(); i++) {
file = sender.getMethod((URL)fileURL.get(i));
if(file == null) {
Thread.sleep(1000L);
throw new RuntimeException("Error descarregant el document a signar.");
System.out.println("Form1 Dentro de getDownloadFile, Antes de startDownload()");
//Fijamos el valor del n�mero de ciclos que se har�n seg�n el tama�o del fichero
this.totalCicles = sender.returnCurrentContentLength() / 1024;
this.progressBar.setMaximum(totalCicles);
//Modificamos el texto del JLabel seg�n el n�mero de fichero que estemos descargando
this.statusLabel.setText((new StringBuilder("Descarregant document ")).append(i + 1).append(" de ").append(fileURL.size()).toString());
statusLabel.setAlignmentX(0.5F);
*//Iniciamos la descarga del fichero, este m�todo llama internamente a un Thread*
*this.startDownload();*
*System.out.println("Form1 Dentro de getDownloadFile, Despu�s de startDownload()");*
*//if (pane.showProgressDialog() == -1) {*
*while (!this.isDone()){*
*System.out.println("No est� acabada la descarga");*
*if (this.isDone()){*
*System.out.println("Thread ACABADO --> Enviamos a puente el archivo");*
*puente = this.byteArray.toByteArray();*
*System.out.println("Form1 getDownloadFile() tama�o puente: " + puente.length);*
*else{*
*Thread.sleep(5000L);*
*// throw new RuntimeException("Proc�s de desc�rrega del document a signar cancel�lat.");*
catch (HeadlessException e) {
//javascript("onSignError", new String[] {
//(new StringBuilder("UI: ")).append(e.getMessage()).toString()});
e.printStackTrace();
catch (MalformedURLException e) {
//javascript("onSignError", new String[] {
//(new StringBuilder("CMS: ")).append(e.getMessage()).toString()});
e.printStackTrace();
catch (HttpSenderException e) {
//javascript("onSignError", new String[] {
//(new StringBuilder("CMS: ")).append(e.getMessage()).toString()});
e.printStackTrace();
catch (InterruptedException e) {
//javascript("onSignError", new String[] {
//(new StringBuilder("CMS: ")).append(e.getMessage()).toString()});
e.printStackTrace();
//System.out.println("Form1 getDownloadFile() tama�o puente: " + puente.length);
return puente;
public void updateStatus(final int i){
Runnable doSetProgressBarValue = new Runnable() {
public void run() {
progressBar.setValue(i);
SwingUtilities.invokeLater(doSetProgressBarValue);
public void startDownload() {
System.out.println("Form1 Inicio startDownload()");
System.out.println("Form1 Dentro de startDownload, antes de definir la subclase SwingWorker");
System.out.println(done);
worker = new SwingWorker() {
public Object construct() {
System.out.println("Form1 Dentro de startDownload, dentro de construct(), Antes de entrar en doWork()");
return doWork();
public void finished() {
System.out.println("Form1 Dentro de startDownload, dentro de finished(), Antes de asignar done = true");
System.out.println(done);
done = true;
System.out.println("Form1 Dentro de startDownload, dentro de finished(), Despu�s de asignar done = true");
System.out.println(done);
statusLabel.setText("Completado, tama�o del archivo: " + (byteArray.size() / 1024) + "KB");
System.out.println("Form1 Dentro de startDownload, antes de worker.start()");
worker.start();
System.out.println("Form1 Dentro de startDownload, antes de salir de startDownload");
System.out.println(done);
System.out.println("Form1 Dentro de startDownload, despu�s de worker.start()");
* M�todo doWork()
* Este m�todo descarga por partes el archivo que es necesario descargar, adem�s de actualizar
* la barra de carga del proceso de carga de la GUI.
public Object doWork() {
System.out.println("Form1 doWork() this.byteArray.size(): " + this.byteArray.size());
try {
byte buffer[] = new byte[1024];
for(int c = 0; (c = this.file.read(buffer)) > 0;) {
this.currentProgress++;
updateStatus(this.currentProgress);
this.byteArray.write(buffer, 0, c);
this.byteArray.flush();
this.file.close();
this.currentProgress = totalCicles;
updateStatus(this.currentProgress);
} catch(IOException e) {
e.printStackTrace();
System.out.println("Form1 doWork() FINAL this.byteArray.size(): " + this.byteArray.size());
//done = true;
System.out.println("AHORA DONE = TRUE");
return "Done";
public boolean isDone() {
return this.done;
FormularioApplet class (main)
package es.cambrabcn.signer.gui;
import java.awt.Color;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import java.security.Security;
import java.util.StringTokenizer;
import java.util.Vector;
import javax.swing.SwingUtilities;
import netscape.javascript.JSObject;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import sun.security.provider.Sun;
import be.cardon.cryptoapi.provider.CryptoAPIProvider;
public class FormularioApplet extends java.applet.Applet {
//Variables globales
int paso = 0;
private static final String JS_ONLOAD = "onLoad";
private static final String JS_ONLOADERROR = "onLoadError";
private static final int SIGNATURE_PDF = 1;
private static final int SIGNATURE_XML = 2;
//private String signButtonValue;
private int signatureType;
private String documentToSign;
private String pdfSignatureField;
private Vector<String> outputFilename;
private Color appletBackground = new Color(255, 255, 255);
private Vector<byte[]> ftbsigned;
* Initializes the applet FormularioApplet
public void init(){
try {
SwingUtilities.invokeLater(new Runnable() {
//SwingUtilities.invokeAndWait(new Runnable() {
//java.awt.EventQueue.invokeAndWait(new Runnable() {
public void run() {
try{
readParameters();
initComponents();
catch(FileNotFoundException e){
javascript(JS_ONLOADERROR, new String[] {
(new StringBuilder("Init: ")).append(e.getMessage()).toString()});
e.printStackTrace();
catch(IOException e) {
javascript(JS_ONLOADERROR, new String[] {
(new StringBuilder("Init: ")).append(e.getMessage()).toString()});
e.printStackTrace();
catch (Exception e) {
javascript(JS_ONLOADERROR, new String[] {
(new StringBuilder("Init: ")).append(e.getMessage()).toString()});
e.printStackTrace();
javascript(JS_ONLOAD, null);
/** This method is called from within the init() method to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" C�digo Generado ">
private void initComponents() {
this.setSize(350, 450);
appletPanel = new javax.swing.JPanel();
jPanel1 = new javax.swing.JPanel();
jTextField1 = new javax.swing.JLabel();
jPanel2 = new javax.swing.JPanel();
label = new javax.swing.JLabel();
jPanel3 = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
setLayout(new java.awt.BorderLayout());
appletPanel.setBackground(new java.awt.Color(255, 255, 255));
appletPanel.setMaximumSize(new java.awt.Dimension(350, 430));
appletPanel.setMinimumSize(new java.awt.Dimension(350, 430));
appletPanel.setPreferredSize(new java.awt.Dimension(350, 430));
jPanel1.setBackground(new java.awt.Color(255, 255, 255));
jPanel1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 102, 204)));
jTextField1.setFont(new java.awt.Font("Arial", 1, 18));
jTextField1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jTextField1.setText("SIGNATURA ELECTRONICA");
org.jdesktop.layout.GroupLayout jPanel1Layout = new org.jdesktop.layout.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.add(jTextField1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 308, Short.MAX_VALUE)
.addContainerGap())
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.add(jTextField1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 24, Short.MAX_VALUE)
.addContainerGap())
jPanel2.setBackground(new java.awt.Color(255, 255, 255));
jPanel2.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 102, 204)));
label.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
label.setIcon(new javax.swing.ImageIcon("C:\\java\\workspaces\\cambrabcn\\firmasElectronicas\\logo.gif"));
org.jdesktop.layout.GroupLayout jPanel2Layout = new org.jdesktop.layout.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.add(label, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 308, Short.MAX_VALUE)
.addContainerGap())
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.add(label)
.addContainerGap(229, Short.MAX_VALUE))
jPanel3.setBackground(new java.awt.Color(255, 255, 255));
jPanel3.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 102, 204)));
//this.jButton1.setVisible(false);
//this.jButton2.setVisible(false);
jButton1.setText("Seg\u00fcent");
jButton1.setAlignmentX(0.5F);
//Cargamos el primer formulario en el JPanel2
loadFirstForm();
//Modificamos el texto del bot�n y el contador de pasos.
//this.jButton1.setText("Siguiente");
//this.jButton1.setVisible(true);
//this.jButton2.setVisible(true);
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
jButton2.setText("Cancel\u00b7lar");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
org.jdesktop.layout.GroupLayout jPanel3Layout = new org.jdesktop.layout.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, jPanel3Layout.createSequentialGroup()
.addContainerGap()
.add(jButton1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 94, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, 112, Short.MAX_VALUE)
.add(jButton2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 102, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
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jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, jPanel3Layout.createSequentialGroup()
.addContainerGap()
.add(jPanel3Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(jButton2)
.add(jButton1))
.addContainerGap())
org.jdesktop.layout.GroupLayout appletPanelLayout = new org.jdesktop.layout.GroupLayout(appletPanel);
appletPanel.setLayout(appletPanelLayout);
appletPanelLayout.setHorizontalGroup(
appletPanelLayout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, appletPanelLayout.createSequentialGroup()
.addContainerGap()
.add(appletPanelLayout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
.add(org.jdesktop.layout.GroupLayout.LEADING, jPanel2, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.add(org.jdesktop.layout.GroupLayout.LEADING, jPanel1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.add(org.jdesktop.layout.GroupLayout.LEADING, jPanel3, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addContainerGap())
appletPanelLayout.setVerticalGroup(
appletPanelLayout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, appletPanelLayout.createSequentialGroup()
.addContainerGap()
.add(jPanel1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(jPanel2, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(jPanel3, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
add(appletPanel, java.awt.BorderLayout.CENTER);
}// </editor-fold>
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
this.destroy();
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
changeForms(this.paso);
// Declaraci�n de variables - no modificar
private javax.swing.JPanel appletPanel;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JLabel jTextField1;
private javax.swing.JLabel label;
// Fin de declaraci�n de variables
* M�todo readParameters
* M�todo que inicializa los valores de los par�metros internos, recibidos por par�metro.
private void readParameters() throws FileNotFoundException, IOException {
???????????????? deleted for the forum
addSecurityProviders();
* M�tode loadFirstForm
* Aquest m�tode carrega a jPanel2 el formulari que informa sobre la c�rrega dels arxius
private void loadFirstForm(){
//Form1 f1 = new Form1(stream, i + 1, fileURL.size(), sender.returnCurrentContentLength(), appletBackground);
//Form1 f1 = new Form1(fileURL.size(), sender.returnCurrentContentLength());
Form1 f1 = new Form1();
//Lo dimensionamos y posicionamos
f1.setSize(310, 150);
f1.setLocation(10, 110);
//A�adimos el formulario al JPanel que lo contendr�
this.jPanel2.add(f1);
//Validem i repintem el JPanel
jPanel2.validate();
jPanel2.repaint();
//Descarreguem l'arxiu a signar
*System.out.println("FormularioApplet Dentro de loadFirstForm(), antes de llamar a getDownloadFile()");*
*byte obj[] = f1.getDownloadedFile(this.documentToSign);*
if (obj == null){
System.out.println("Lo que devuelve f1.getDownloadedFile(this.documentToSign) es NULL");
else{
System.out.println("Lo que devuelve f1.getDownloadedFile(this.documentToSign) NO es NULL");
System.out.println("obj: " + obj.length);
this.ftbsigned.add(obj);
System.out.println("FormularioApplet Dentro de loadFirstForm(), despu�s de llamar a getDownloadFile()");
//Indicamos que el primer paso ya se ha efectuado
this.paso++;
* M�tode changeForms
* Aquest m�tode carrega a jPanel2 un formulari concret segons el valor de la variable global "paso"
private void changeForms(int paso){
/*A cada paso se cargar� en el JPanel y formulario diferente
* Paso previo: Se realiza en la inicializaci�n, carga el formulario, descarga el archivo y muestra la barra de carga.
* Case 1: Se carga el formulario de selecci�n de tipo de firma.
* Case 2: Se carga el formulario de datos de la persona que firma.
this.paso = paso;
switch(paso){
case 1:
//Creamos un objeto de formulario (seleccion de tipo de firma)
Form2 f2 = new Form2();
//Lo dimensionamos y posicionamos
f2.setSize(310, 185);
f2.setLocation(10, 110);
//Quitamos el formulario 1 y a�adimos el formulario 2 al JPanel
this.jPanel2.remove(1);
this.jPanel2.add(f2);
//Validem i repintem el JPanel
jPanel2.validate();
jPanel2.repaint();
//Modificamos el contador de pasos.
this.paso++;
break;
case 2:
//Creamos un objeto de formulario (seleccion de tipo de firma)
Form3 f3 = new Form3();
//Lo dimensionamos y posicionamos
f3.setSize(310, 175);
f3.setLocation(15, 130);
//Quitamos el formulario 1 y a�adimos el formulario 3 al JPanel
this.jPanel2.remove(1);
this.jPanel2.add(f3);
//Validem i repintem el JPanel
jPanel2.validate();
jPanel2.repaint();
//Modificamos el texto del bot�n y el contador de pasos.
this.jButton1.setText("Finalizar");
this.paso++;
break;
default:
//Finalizar el Applet
//C�digo que se encargue de guardar el archivo en el disco duro del usuario
break;
private void addSecurityProviders() throws FileNotFoundException, IOException {
Security.addProvider(new CryptoAPIProvider());
if (signatureType == SIGNATURE_PDF) {
Security.addProvider(new BouncyCastleProvider());
else {
Security.addProvider(new Sun());
private File createOutputFile(String filename, int index) {
return new File((String)outputFilename.get(index));
protected Object javascript(String function, String args[]) throws RuntimeException {
//Remove
if (true) return null;
try {
Vector<String> list = new Vector<String>();
if(args != null) {
for(int i = 0; i < args.length; i++) {
list.addElement(args);
if(list.size() > 0) {
Object objs[] = new Object[list.size()];
list.copyInto(objs);
return JSObject.getWindow(this).call(function, objs);
} catch(UnsatisfiedLinkError e) {
e.printStackTrace();
throw new RuntimeException((new StringBuilder()).append(e).append("\nFunci�: ").append(function).toString());
} catch(Throwable e) {
e.printStackTrace();
throw new RuntimeException((new StringBuilder()).append(e).append("\nFunci�: ").append(function).toString());
return JSObject.getWindow(this).call(function, new Object[0]);
Edited by: Kefalegereta on Oct 31, 2007 3:54 AM
Edited by: Kefalegereta on Oct 31, 2007 4:00 AMLook at iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
Additional things to try.
Try this first. Turn Off your iPad. Then turn Off (disconnect power cord) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
Change the channel on your wireless router. Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
Another thing to try - Go into your router security settings and change from WEP to WPA with AES.
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
If none of the above suggestions work, look at this link.
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
Cheers, Tom -
Problem with JFileChooser and ImageIcon
I'm trying to create an ImageIcon object from file selected in JFileChooser. The problem is that jfc.getSelectedFile().getAbsolutePath() returns a string with backslashes and the constructor of ImageIcon requires the string to have slashes. I`ve tried to create it via URL but it doesn't work as well...
String lastUsedPath;
URL imageURL;
JFileChooser fc = new JFileChooser();
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
int returnVal = fc.showDialog(frame,title);
if(returnVal==JFileChooser.APPROVE_OPTION){
lastUsedPath = fc.getSelectedFile().getAbsolutePath();
imageURL = getClass().getResource(lastUsedPath); //don't really get this but I copied it from Java Swing Tutorial
}else{
return null;
int curH, curW;
ImageIcon srcIcon = new ImageIcon(imageURL);
curW = srcIcon.getIconWidth();
curH = srcIcon.getIconHeight();If I use it this way imageURL is set to null.
If I set the imageURL as 'fc.getSelectedFile().toURL()' the string is eg.: "file:/E:/file.jpg" instead of "E:/file.jpg". After that the ImageIcon is created but width and height return -1.
If I try to create ImageIcon by 'new ImageIcon(lastUsedPath)' I get a not null object but the width & height of the ImageIcon is -1 as well.
What do I have to do to be able to create an ImageIcon from file selected in JFileChooser? Why is this so hard and mind blowing?It still returns the ImageIcon object with width & height set to -1.
EDIT:
Got it finally:
lastUsedPathForStupidImageIcon = fc.getSelectedFile().getPath();
img = ImageIO.read(new File(lastUsedPathForStupidImageIcon));
curH = img.getHeight(this);
curW = img.getWidth(this);The key was to use another String variable and hold the path instead of the absolute path
Edited by: Beholder on Jan 17, 2010 1:35 PM -
Alright, before you guys flip out and say post it to the swing forum, why does the swing forum say read only? Now I have searched the forum but cannot find anything that deals with swing and the kind I am doing. So if you can provide some advice or some help, it would be greatly appreciated. This is my last hurdle to tackle in my school project.
I tried a StringBuffer approach but it kept giving me an error saying it would not work with JTextArea? Maybe the code was wrong?
This needs to take the text on the screen which I have and post it reversed when the "Reverse" button is clicked... I have been searching the web and these forums and all the different reverse methods and theories are confusing me, I try to copy them and get them to work but I just keep receiving errors. What is the best way to do this with using GUI?
else if (actionCommand.equals("Reverse"))
reverseMemo = theText.getText();
/*Is this where I would put the reverse code?*/
theText.setText(reverseMemo);
}Thanks,
JessJust write a method to reverse the text
read the string in reverse and start plugging the values into a string buffer (inside a loop of course)
then display results:
textfield.setText(stringbuffer.toString());
This is my last hurdle to tackle in my school project.I highly doubt it.
The fact you are asking this question shows me you did not learn anything about Java much less computer science. Your question has nothing to do with swing. -
Parsing a string to formula and executing to int value
Hi ,
I have a String from the database which will hold symbols + - etc.
Eg: String a =((((2+5)/(80*76)) -65)*)The above shows a string with operators and numeric values. I need to execute this String and obtain a integer value.
How i can accomplish this. From database ill be getting may different string with different formula values.
Any help is highly appreciated.
Thanks in advance.
Regards,
Satheesh Kannan.A.BWe already have [this post|http://forums.sun.com/thread.jspa?threadID=5144807],
may also try [this link|http://sourceforge.net/projects/expression-tree/]. -
it is possible to create a standalone file, that works with swing and it can take less than 0.5MB (JRE takes 9MB)
What's jView?
There's a JViewport() in the API but no JView?
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