Applets/filechooser HELP!!!
i am currently constructing an applet to run online.
i have put in a "select" filechooser box that is supposed to appear when the button "select file" at the bottom of the applet is pressed.
The applet compiles OK but when i do press the select file JButton this error appears:
Starting appletviewer for I:\9603794\Diss\testGUI2.html
Exception occurred during event dispatching:
java.security.AccessControlException: access denied (java.util.PropertyPermission user.home read)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java, Compiled Code)
at java.security.AccessController.checkPermission(AccessController.java, Compiled Code)
at java.lang.SecurityManager.checkPermission(SecurityManager.java, Compiled Code)
at java.lang.SecurityManager.checkPropertyAccess(SecurityManager.java, Compiled Code)
at java.lang.System.getProperty(System.java, Compiled Code)
at javax.swing.filechooser.FileSystemView.getHomeDirectory(FileSystemView.java:113)
at javax.swing.JFileChooser.setCurrentDirectory(JFileChooser.java:408)
at javax.swing.JFileChooser.<init>(JFileChooser.java:271)
at javax.swing.JFileChooser.<init>(JFileChooser.java:233)
at testGUI2.selectFile(testGUI2.java:96)
at testGUI2$SelectActionListener.actionPerformed(testGUI2.java:87)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1066)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1101)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:204)
at java.awt.Component.processMouseEvent(Component.java:3160)
at java.awt.Component.processEvent(Component.java:2999)
at java.awt.Container.processEvent(Container.java:990)
at java.awt.Component.dispatchEventImpl(Component.java:2394)
at java.awt.Container.dispatchEventImpl(Container.java:1035)
at java.awt.Component.dispatchEvent(Component.java, Compiled Code)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2043)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:1827)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1730)
at java.awt.Container.dispatchEventImpl(Container.java:1022)
at java.awt.Component.dispatchEvent(Component.java, Compiled Code)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:287)
at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:92)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:83)
Any help would be much appreciated
THANKS.
The exceptions are thrown out because browser won't allow your applet to access the local file system for security reasons. What you can do, is either write a new policy file which give the permision to the applet to access your local file system, or create a java certificate which assign all the permisions to your applet.
Take a look at this article about certificate:
http://java.sun.com/docs/books/tutorial/security1.2/toolfilex/rstep1.html
Good luck!
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Here is the code and the error msg:
package BrImage;
/* Example 16-3 An Image Previewer Accessory implements BrImagFile*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.io.*;
import java.applet.Applet;
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public void init() {
getContentPane().add(new JLabel("JAppletSwing!"));
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setPreferredSize(new Dimension(150,0));
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contentPane.setLayout(new FlowLayout());
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/* needs to open file on the right html */
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chooser.setFileFilter(new ImageFilter()); /*test filter */
chooser.addPropertyChangeListener(
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if(e.getPropertyName().equals(
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File f = (File)e.getNewValue();
String s = f.getPath(), suffix = null;
int i = s.lastIndexOf('.');
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BrImage/BrImage.java [109:1] non-static variable this cannot be referenced from a static context
JFrame f = new BrImagFile();
^
1 error
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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
import java.util.*;
public class BlackJackClient extends JApplet
private Deck cardDeck;
private BlackjackHand myHand;
private final int SIZE_OF_HAND = 2;
private final String directory = "cards/";
private JLabel[] handLbl = new JLabel[ SIZE_OF_HAND ];
private Container container;
private JPanel panel1,panel2,Flow,Opponent,Player;
private JPanel cardsTop,cardsBottom;
private JLabel Player_Status;
private JLabel top_card1,top_card2,top_card3,top_card4,top_card5;
private JLabel bottom_card1,bottom_card2,bottom_card3,bottom_card4,bottom_card5;
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private TitledBorder Cr1,Cr2,Cr3,Cr4,Cr5;
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private JTextArea Messages;
private JButton Hit,Stand,JButton1;
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//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++PANELS
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Player=new JPanel();
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cardsBottom=new JPanel(new FlowLayout(FlowLayout.CENTER,10,15));
panel1=new JPanel();
panel2=new JPanel();
box1=new JPanel();
box2=new JPanel();
box3=new JPanel();
box4=new JPanel();
box5=new JPanel();
box6=new JPanel();
box7=new JPanel();
box8=new JPanel();
box9=new JPanel();
box10=new JPanel();
Flow=new JPanel(new FlowLayout(FlowLayout.RIGHT,3,0));
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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label.setForeground(Color.white);
label.setFont(new Font("Futura",Font.BOLD,19));
panel1.add(label);
panel1.setBackground(Color.black);
Icon card1=new ImageIcon("Trapula/c1.png");
top_card1=new JLabel(card1);
Icon card2=new ImageIcon("Trapula/d1.png");
top_card2=new JLabel(card2);
Icon card3=new ImageIcon("Trapula/h1.png");
top_card3=new JLabel(card3);
Icon card4=new ImageIcon("Trapula/s1.png");
top_card4=new JLabel(card4);
Icon card5=new ImageIcon("Trapula/ck.png");
top_card5=new JLabel(card5);
box1.add(top_card1);
cardsTop.add(box1);
box2.add(top_card2);
cardsTop.add(box2);
box3.add(top_card3);
cardsTop.add(box3);
box4.add(top_card4);
cardsTop.add(box4);
box5.add(top_card5);
cardsTop.add(box5);
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box1.setBorder(Cr1);
box1.setBackground(Color.gray);
Cr2 = new TitledBorder(new LineBorder(Color.black,2), "");
box2.setBorder(Cr2);
box2.setBackground(Color.gray);
Cr3 = new TitledBorder(new LineBorder(Color.black,2), "");
box3.setBorder(Cr3);
box3.setBackground(Color.gray);
Cr4 = new TitledBorder(new LineBorder(Color.black,2), "");
box4.setBorder(Cr4);
box4.setBackground(Color.gray);
Cr5 = new TitledBorder(new LineBorder(Color.black,2), "");
box5.setBorder(Cr5);
box5.setBackground(Color.gray);
opponent=new TitledBorder(new LineBorder(Color.black,5),"Opponent");
Opponent.setBorder(opponent);
Opponent.add(cardsTop);
Opponent.setBackground(Color.green);
cardsTop.setBackground(Color.green);
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Icon card6=new ImageIcon("Trapula/s4.png");
bottom_card1=new JLabel(card6);
Icon card7=new ImageIcon("Trapula/s5.png");
bottom_card2=new JLabel(card7);
Icon card8=new ImageIcon("Trapula/s6.png");
bottom_card3=new JLabel(card8);
Icon card9=new ImageIcon("Trapula/s7.png");
bottom_card4=new JLabel(card9);
Icon card10=new ImageIcon("Trapula/s8.png");
bottom_card5=new JLabel(card10);
box6.add(bottom_card1);
cardsBottom.add(box6);
box7.add(bottom_card2);
cardsBottom.add(box7);
box8.add(bottom_card3);
cardsBottom.add(box8);
box9.add(bottom_card4);
cardsBottom.add(box9);
box10.add(bottom_card5);
cardsBottom.add(box10);
B1=new TitledBorder(new LineBorder(Color.black,2), "");
box6.setBorder(B1);
box6.setBackground(Color.gray);
B2=new TitledBorder(new LineBorder(Color.black,2), "");
box7.setBorder(B2);
box7.setBackground(Color.gray);
B3=new TitledBorder(new LineBorder(Color.black,2), "");
box8.setBorder(B3);
box8.setBackground(Color.gray);
B4=new TitledBorder(new LineBorder(Color.black,2), "");
box9.setBorder(B4);
box9.setBackground(Color.gray);
B5=new TitledBorder(new LineBorder(Color.black,2), "");
box10.setBorder(B5);
box10.setBackground(Color.gray);
player=new TitledBorder(new LineBorder(Color.black,5),"Player");
player.setTitleColor(Color.black);
Player.setBorder(player);
JPanel Hand=new JPanel();
JButton1=new JButton("Draw Hand");
JButton1.setActionCommand("Draw a Hand");
JButton1.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e)
{ Object object=e.getSource();
if(e.getSource()==object)
{ cardDeck.restoreDeck();
cardDeck.shuffle();
myHand.discardHand();
for ( int i = 0; i < SIZE_OF_HAND; i++ )
{ Card c = cardDeck.dealCard();
myHand.addCard( c );
handLbl.setIcon( c.getCardImage() );
handLbl[i].setText( c.toString() );
showBlackjackScore();
Hand.add(JButton1);
Hand.setBackground(Color.green);
cardsBottom.setBackground(Color.green);
Player.setBackground(Color.green);
Player.add(cardsBottom);
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Messages=new JTextArea("----------------------------------------------------Messages-------------------------------------------------\n\n\n",10,42);
JScrollPane scroller=new JScrollPane(Messages);
Messages.setEditable(false);
Messages.setForeground(Color.white);
Messages.setBackground(Color.gray);
panel2.setBackground(Color.green);
panel2.add(scroller);
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
JButton Exit=new JButton("Exit");
Exit.setToolTipText("Disconnect");
Hit=new JButton("Hit");
Hit.setToolTipText("Ask another card?");
Stand=new JButton("Stand");
Stand.setToolTipText("Satisfied with your card/s?");
JLabel l1=new JLabel(" ");
JLabel l2=new JLabel(" ");
JLabel l3=new JLabel(" ");
JLabel l4=new JLabel(" ");
JLabel l5=new JLabel(" ");
Exit.addActionListener(new ActionListener()
{public void actionPerformed(ActionEvent e)
{System.out.println("Disconnected from BlackJack Thank you for Gambling!");
System.exit(0);
Hit.addActionListener(new ActionListener()
{public void actionPerformed(ActionEvent e)
{Messages.append("Hit Me!!\n");}
Stand.addActionListener(new ActionListener()
{public void actionPerformed(ActionEvent e)
{Messages.append("Stand\n");}
Flow.add(l1);
Flow.add(l2);
Flow.add(l3);
Flow.add(l4);
Flow.add(l5);
Flow.add(Exit);
Flow.add(Hit);
Flow.add(Stand);
Flow.setBackground(Color.green);
p.add(Flow);
//++++++++++++++++++++++++++++++++++++++++++++++++++++
container.add(panel1);
container.add(Opponent);
container.add(Player);
container.add(Hand);
container.add(panel2);
container.add(p);
}//end of Black Jack client constructor
public void init()
{ cardDeck = new Deck();
Iterator suitIterator = Suit.VALUES.iterator();
while ( suitIterator.hasNext() )
{ Suit suit = (Suit) suitIterator.next();
Iterator rankIterator = Rank.VALUES.iterator();
while ( rankIterator.hasNext() )
{ Rank rank = (Rank) rankIterator.next();
String imageFile = directory + Card.getFilename( suit, rank );
ImageIcon cardImage = new ImageIcon( getImage( getCodeBase(), imageFile ) );
Card card = new Card( suit, rank, cardImage );
cardDeck.addCard( card );
}//end of init
private void showBlackjackScore()
int score = myHand.evaluateHand();
if( score == 21 )
{ scoreLbl.setText( score + "!" );
scoreLbl.setForeground( Color.red );
else
{ scoreLbl.setText( "" + score );
scoreLbl.setForeground( Color.black );
}//end of showBlackjackScore
}//end of class Black Jack clientI might be wrong, but maybe the init() method isn't showing any GUI because you're not creating or adding any components there.
Rather than putting all the Swing code in your constructor, put it in a method that returns your top-level component, such as:
private Component createComponents() {
// blah
}Then, in your init() method, try something like:
public void init() {
try {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createComponents();
catch (Exception e) {
System.err.println("Applet could not be created succesfully");
e.printStackTrace();
}Do you get any error messages with your current program?
Message was edited by:
Djaunl -
I have an applet that contains too much information to fit on the screen, so I need a scrollbar so I can view the rest. The kind of scrollbar that's on the side of a web browser that lets you scroll down to view the rest of the page. It's a class that extends Applet and implements MouseListener and ActionListener. I've looked around the internet for the solution for an hour and found nothing. Any help would be much appreciated
Put a JScrollpane your ScrollPane as the main Panel of your applet, then put the content of your applet in a JPanel yourPanel and finaly call yourScrollPane.setViewPortView(yourPanel).
Try that. It should work. -
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So far, I have written code (with the help of the GREAT Forum community here) that executes tcpdump, redirects the standard output to BufferedReadert and then prints that BufferedReader to the screen. Here is the code:
public class tcpdumpReadOutputNonApplet
public static void main(String args[])
try
Process tcpdump = Runtime.getRuntime().exec("/usr/sbin/tcpdump -l -i any");
System.out.println("PROCESS STARTED...");
BufferedReader in = new BufferedReader(new InputStreamReader(tcpdump.getInputStream()));
System.out.println("STREAM READ INTO BUFFER...");
String tcpdumpStream;
while ((tcpdumpStream = in.readLine()) != null)
{ //print the output to screen
System.out.println(tcpdumpStream);
}//end while
}//end try
catch (Exception e)
String error = e.toString();
System.out.println("EXCEPTION OCCURED!");
System.out.println(error);
}//end main()
}//tcpdumpReadOutput()
Once I got that to work, my next step was to try to redirect the BufferedReader to print to a webpage, but it didn't work. I thought (perhaps foolishly) that all I had to do was change this application into an applet and replace System.out.println with a drawString meathod. Well it didn't work. At least over my internal network. Something I might add is that the webpage I tried this on was not being served thru a webserver. It was just an HTML file that was opened over the network. Maybe this has something to do with it but I am doubtful.
So that is my dilemma. Hope this post isn't too painful to read ^_^ -
Does anyone know how to close an applet dynamically from within its own code.
Have tried via javascript but the applet I created using the object tag fails to communicate correctly. Says 'Object does not support this operation'.
If anyone can help I would be grateful as this is a major issue now.
Thanks Andrew MercerThankyou very much for your help.
I can now use java code from an applet to close the window that surrounds this applet.
However I still have one problem that I cannot solve by looking through the documentation.
My applet basically is used to copy files from server to client cache. Once each file is fully copied over then the applet has done its job and can be closed.
The main Browser window stays open all this time and each applet window is opened and file transfered by hitting a link on this window from a list of links that can run into 100's.
The first time this operation is requested the JSObject.getWindow(this) call returns a valid reference to the applet within the window.
Once the first window is closed the next JSOBject.getWindow(this) fails, in fact it goes no further and does not return an exception or suitable message.
This happens even if I have closed the window manually.
How can I use the getWindow(this) call for subsequent windows?
Depending where I put the getWindow(this) I can actually make the applet init operation stall and go no further.
Thanks again.
Andrew Mercer -
Hey everyone,
I'm having an issue understanding why my .jnlp file is seemingly being ignored. I'm trying to deploy an applet as follows:
<body bgcolor="Black">
<br><br><br><br><br>
<center>
<script src="http://www.java.com/js/deployJava.js"></script>
<script>
var attributes = {code:'System.AppletShell', width:800, height:600};
var parameters = {jnlp_href: 'NGEngine.jnlp'};
deployJava.runApplet(attributes, parameters, '1.6');
</script>
</center>
</body>And my jnlp configuration file is as follows:
<?xml version="1.0" encoding="windows-1252"?>
<jnlp codebase="http://localhost/applet">
<information>
<title>Project Foundation</title>
<vendor>Company</vendor>
<homepage href="http://www.company.com"/>
<icon href="EconomicCenter.jpg">
<kind>splash</kind>
<height>100</height>
<height>200</height>
</icon>
<offline-allowed/>
<shortcut online="true">
<desktop/>
<menu submenu="Company"/>
</shortcut>
</information>
<resources>
<java version="1.3+" initial-heap-size="128m" max-heap-size="512m"/>
<jar href="NGEngine.jar"/>
<extension name="jogl" href="http://download.java.net/media/jogl/builds/archive/jsr-231-webstart-current/jogl.jnlp"/>
</resources>
<applet-desc main-class="System.AppletShell" name="Project Foundation" width="800" height="600">
</jnlp>The problem is that I can get the applet to run if I specify to the deployment SCRIPT, the following parameters: code, codebase, and archive. At that point, the applet runs but it can't find my my jogl extension. If I manually feed the .jnlp file to web start everything starts up fine. Also, I am hosting these files via apache, and the .jnlp mime type has been set up correctly afaik (mime.types).
So, why is it that the .jnlp file is seemingly being ignored?
Thanks ahead of time!
Edited by: dyamanoha on Mar 7, 2010 3:57 PMThanks for the reply. Just a quick note, I'm both relatively new at coding in Java, and completely new at deploying anything in Java, so if any of these questions stem from a lack of research on my part, I apologize.
I've been using both these resources as primary references:
1* [http://java.sun.com/docs/books/tutorial/deployment/deploymentInDepth/runAppletFunction.html], and
2* [http://java.sun.com/javase/technologies/desktop/javawebstart/download-spec.html] (the 6.0.10 specification / 6.0.18?)
You stated that "An embedded applet JNLP should have no code base specified... ". However, according to 1*: "... if some deployment options have different values in the attribute name-value pairs and in the JNLP file ... leave the codebase attribute empty or specify an absolute URL. When the codebase attribute is left empty, it defaults to the directory containing the JNLP file." This is a bit confusing for me, because if I remove codebase attribute from the jnlp, which happens to be the "absolute path to the directory containing the JNLP file", I suddenly get an application error from the jdk web start tool: "BadFieldException[ The field <icon>href has an invalid value: EconomicCenter.jpg,EconomicCenter.jpg]". (The jdk tool starts everything perfectly fine if the codebase attribute is present.)
So I thought that specifying the document base might fix this issue, since my EconomicCenter.jpg resides in the same directory as document base, but that didn't seem to work.
Further, I have some confusion surrounding the point of the code attribute that deployJava.runApplet consumes. What is the difference between the code attribute, and the main-class attribute of the jnlp's applet-desc element?
If I try to launch the embedded applet/jnlp, from my browser, I get the error: "load: class System.AppletShell not found.", and the jnlp file is still seems to be ignored.
Also, I downloaded janela although it hasn't helped terribly much to get my feet off the ground yet, but here's the output in any case (with codebase removed from the jnlp open tag).
JaNeLA Report - version 10.03.07
Report for http://localhost/applet/ngengine.jnlp
XML encoding not known, but declared as UTF-8
Codebase not specified. Defaulting to http://localhost/applet/
Desktop icons were subject to bug nnnn in earlier J2SE versions
Downloads can be optimized by specifying a resource size for 'NGEngine.jar'.
The resource download at NGEngine.jar can be optimized by removing the (default) value of download='eager'.
The resource download at NGEngine.jar can be optimized by removing the (default) value of main='false'.
It might be possible to optimize the start-up of the app. by specifying download='lazy' for the NGEngine.jar resource.
Lazy downloads might not work as expected for NGEngine.jar unless the download 'part' is specified.
Downloads can be optimized by specifying a resource size for 'EconomicCenter.jpg'.
Icon loading & use can be optimized by specifying the width and height for EconomicCenter.jpgHere's the updated javascript call and jnlp with hopefully corrected changes:
<script src="http://www.java.com/js/deployJava.js"></script>
<script>
var attributes = {code:'System.AppletShell', width:800, height:600};
var parameters = {jnlp_href: 'NGEngine.jnlp'};
deployJava.runApplet(attributes, parameters, '1.6');
</script>
<?xml version="1.0" encoding="UTF-8"?>
<jnlp>
<information>
<title>Project Foundation</title>
<vendor>Company</vendor>
<icon href="EconomicCenter.jpg"/>
<offline-allowed/>
<shortcut online="true">
<desktop/>
<menu submenu="Company"/>
</shortcut>
</information>
<resources>
<java version="1.3+" initial-heap-size="128m" max-heap-size="512m"/>
<jar href="NGEngine.jar"/>
<extension name="jogl" href="http://download.java.net/media/jogl/builds/archive/jsr-231-webstart-current/jogl.jnlp"/>
</resources>
<applet-desc main-class="System.AppletShell" documentbase="http://localhost/applet/applet.html" name="Project Foundation" width="800" height="600"/>
</jnlp>And just in case I'm screwing up my file structure:
Directory of C:\Program Files (x86)\Apache Software Foundation\Apache2.2\htdocs\applet
03/08/2010 12:26 PM <DIR> .
03/08/2010 12:26 PM <DIR> ..
03/07/2010 03:48 PM 353 applet.html
03/05/2010 03:09 PM 988 AppletShell - Copy.html
01/31/2010 02:54 AM <DIR> cachedir
03/08/2010 12:26 PM 0 directory.txt
03/05/2010 10:50 PM 163,002 EconomicCenter.jpg
01/31/2010 02:21 AM <DIR> lib
03/05/2010 03:32 PM 51,930,853 NGEngine.jar
03/08/2010 12:15 PM 756 NGEngine.jnlp
6 File(s) 52,095,952 bytes
4 Dir(s) 30,308,773,888 bytes freeEdited by: dyamanoha on Mar 8, 2010 12:37 PM -
Javascript-Applet connection: Help!
Hi,
Below is a JSP page followed by the Applet that it loads. The applet displays an inputDialog in the init() method and another int he setNum(...) method. Init() displays the dialog correctly, but setNum hangs IE completely when it displays de dialog. Where did I go wrong?
Thanks for your help.
Miguel
PS Type a number in the text box and push the "Do" button.<HTML>
<HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
function send() {
alert("send");
var num = parseInt(document.forms[0].Num.value);
document.applets[0].SetNum(num);
alert("send: num..." + num);
</SCRIPT>
</HEAD>
<BODY>
<FORM>
<BR>Num: <INPUT TYPE=TEXT NAME=Num>
<BR><INPUT TYPE=BUTTON NAME="Do" VALUE="Do" onClick="send()">
</FORM>
<APPLET CODE="test.class" WIDTH = 500 HEIGHT = 250 MYSCRIPT>
</APPLET>
</BODY>
</HTML>
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class test extends JApplet {
public void init() {
String str = JOptionPane.showInputDialog("init....");
public void SetNum(int num) {
String str2 = JOptionPane.showInputDialog("SetNum: " + num);zneroladivad,
Thanks for your reply. My Tomcat console window does not show any output other than the messages during startup. I searched all of my computer but I could not find a file called plugin.trace.
Just in case, the inputDialog actually shows the information I expected. The only trouble is that I can't dismiss it, I can't type data in it and, I can't select any IE options other than close the main window with the X at the top right corner.
I hope this helps,
Miguel -
The height parameter of the applet tag can be entered either in terms of number of pixels or % of the browser height.
Is there a way to specify the height as the maximum of two: a fixed size, say, 500 pixels, and a fixed percent, say, 70%, of the browser height? If a Javascript is necessary, could someone help me out with that?
Thanks in advance,
Sooby Bhattacharjee, SDSUIt is possible to use a % height in the html document and resize() the applet (within the applet) to 500 pixels in height if smaller.
Faifai -
Hi all,
I made program work fine as an application, but I cannot get it to work as an applet. I'm trying to write an applet that asks the user to enter two floating-point numbers, obtain the two numbers from the user and draws the sum, product, difference, and quotient of the two numbers.I appreicate any help. My main errors are in the calculations og *,/,-,+ .... I do not know how to fix this though I suspect it simple. Thanks for any help.
import java.awt.Graphics;
import javax.swing.*;
public class Math extends JApplet {
double sum, product, difference, quotient;
public void init ()
String firstNumber,
secondNumber;
Double number1,number2;
firstNumber = JOptionPane.showInputDialog ("Enter first floating pt value" );
secondNumber = JOptionPane.showInputDialog ("Enter second floating pt value");
number1 = Double.parseDouble( firstNumber );
number2 = Double.parseDouble( secondNumber );
sum = number1 + number2;
product = number1 * number2;
difference = number1 - number2;
quotient = number1 / number2;
public void paint( Graphics g )
g.drawRect(15, 10, 270, 20);
g.drawString("The sum is: " + sum + "\n" +
"The difference is: " + difference + "\n" + "The qoutient is: "
+ quotient + "\n" + "The product is: " + product, 25,25);
System.exit (0);
}Arrgg.... When I use this code in HTML it doesn't drop lines.
public void paint( Graphics g )
g.drawRect(15, 10, 270, 20);
g.drawString("The sum is: " + sum + "\n" +
"The difference is: " + difference + "\n" + "The qoutient is: "
+ quotient + "\n" + "The product is: " + product, 25,25);
Why are the "\n" not working? Any thoughts?
HTML:
<html>
<applet code="Math.class" width=500 height=200>
</applet>
</html> -
Sending emails from inside an applet (Please help!)
Hi all!
I�d like to send an email from inside the applet. For this reason I need to get the Systemproperties, don't I ?
Properties props = System.getProperties();
props.put("mail.smtp.host", mailhost);
... and set the mail.smtp.host Property my smtp-host.
But as I try to get the systemproperties from the applet, I get the exception:
com.ms.security.SecurityExceptionEx[Sendmsg.<init>]: Unable to access system properties.
Can somebody tell me, how I can solve this problem? Which properties are needed to send mails?
Does it work, if I just create my Properties, and set only the smtp.host?
As I continued my experiments, I realised that it is not only the mail.smtp.host property, that is needed by the applet, but java.home, and many more...
So is it possible to send emails in this form at all??
Pleeaaaase help, I have to hand in my project very soon!
Thanks a lot,
GaborI've found a site about signing:
http://www.suitable.com/Doc_CodeSigning.shtml
I think you can read german, therefore the german newsgroup de.comp.lang.java is a good point to search. Use http://groups.google.com to search the group.
Uwe -
Don't get expected results from my Applet
and Applet does not compile.
// expected results in the JTextField "box"
// AF.PA;36,39;4/5/2007;17h35;+1,25;35,53;36,62;35,52;2547827
// LVMH.PA;84,28;4/3/2007;17h38;+1,16;83,80;84,58;83,32;1963844
import java.applet.AppletContext;
import javax.swing.*;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.awt.event.*;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.*;
�
public class ShowDocument extends JApplet
implements ActionListener {
the_URLWindow the_URLWindow;
�
public void init() {
//Execute a job on the event-dispatching thread:
//creating this applet's GUI.
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
createGUI();
} catch (Exception e) {
System.err.println("createGUI didn't successfully complete");
�
private void createGUI() {
JButton button = new JButton("Bring up the_URL window");
button.addActionListener(this);
add(button);
�
JFrame.setDefaultLookAndFeelDecorated(true);
the_URLWindow = new the_URLWindow(getAppletContext());
the_URLWindow.pack();
�
public void destroy() {
//Execute a job on the event-dispatching thread:
//creating this applet's GUI.
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
destroyGUI();
} catch (Exception e) { }
private void destroyGUI() {
the_URLWindow.setVisible(false);
the_URLWindow = null;
�
public void actionPerformed(ActionEvent event) {
the_URLWindow.setVisible(true);
�
class the_URLWindow extends JFrame
implements ActionListener {
JTextField the_URL_Field;
JComboBox choice;
AppletContext appletContext;
�
public the_URLWindow(AppletContext appletContext) {
super("Show a Document!");
this.appletContext = appletContext;
�
JPanel contentPane = new JPanel(new GridBagLayout());
setContentPane(contentPane);
contentPane.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
�
JLabel label1 = new JLabel("the_URL of document to show: ",
JLabel.TRAILING);
add(label1, c);
�
the_URL_Field = new JTextField("http://fr.finance.yahoo.com/d/quotes.txt?m=PA&f=sl1d1t1c1ohgv&e=.csv&s=AF.PA&s=LVMH.PA", 20);
label1.setLabelFor(the_URL_Field);
the_URL_Field.addActionListener(this);
c.gridwidth = GridBagConstraints.REMAINDER;
c.weightx = 1.0;
add(the_URL_Field, c);
�
JLabel label2 = new JLabel("Window/frame to show it in: ",
JLabel.TRAILING);
c.gridwidth = 1;
c.weightx = 0.0;
add(label2, c);
�
String[] strings = {
"(browser's choice)", //don't specify
"My Personal Window", //a window named "My Personal Window"
"_blank", //a new, unnamed window
"_self",
"_parent",
"_top" //the Frame that contained this applet
choice = new JComboBox(strings);
label2.setLabelFor(choice);
c.fill = GridBagConstraints.NONE;
c.gridwidth = GridBagConstraints.REMAINDER;
c.insets = new Insets(5,0,0,0);
c.anchor = GridBagConstraints.LINE_START;
add(choice, c);
JTextField box = new JTextField("Results");
//box.setLines(10);
box.setColumns(100);
c.fill = GridBagConstraints.NONE;
c.gridwidth = GridBagConstraints.REMAINDER;
c.insets = new Insets(5,100,100,0);
c.anchor = GridBagConstraints.LINE_START;
add(box, c);
JButton button = new JButton("Show document");
button.addActionListener(this);
c.weighty = 1.0;
c.ipadx = 10;
c.ipady = 10;
c.insets = new Insets(10,0,0,0);
c.anchor = GridBagConstraints.PAGE_END;
add(button, c);
public void actionPerformed(ActionEvent event) {
String the_URL_String = the_URL_Field.getText();
URL the_URL = null;
try {
the_URL = new URL(the_URL_String);
} catch (MalformedURLException e) {
System.err.println("Malformed URL: " + the_URL_String);
�
if (the_URL != null) {
box.setText(showDocument(the_URL));// *********** Java Compiler error *************
URLConnection conn = the_URL.openConnection();
BufferedReader in =
new BufferedReader(new InputStreamReader(conn.getInputStream()));
String inputLine;
�
while ((inputLine = in.readLine()) != null) {
System.out.println(inputLine);
in.close();
if (choice.getSelectedIndex() == 0) {
appletContext.showDocument(the_URL);
} else {
appletContext.showDocument(the_URL,
(String)choice.getSelectedItem());
}Simple but compiler error.
If I uncomments the following lines:
if (choice.getSelectedIndex() == 0) {
appletContext.showDocument(the_URL);
} else {
appletContext.showDocument(the_URL,
(String)choice.getSelectedItem());
*/I get the info but the ASCII file is downloaded in my default downloads folder "/Downloads".
Right now I have 12 dozens of files named "quotes. txt quotes-1.txt etc ... quotes-n.txt"
correspondind to n clicks on the button. Unmanageable.
Just want to get the following in my JTextField named "box":
AF.PA;36,39;4/5/2007;17h35;+1,25;35,53;36,62;35,52;2547827
LVMH.PA;84,28;4/3/2007;17h38;+1,16;83,80;84,58;83,32;1963844
1 - If I succeed I will read the content of the JTextField - line by line - do a split(";")
on each line to get a vector of data and finnally connect with connector/J to
add records to a mySQL database.
2 - If I succeed for step 1, I will create a Thread calling the stuff every 20 mn.
This is my final objective.
All the working and not working stuff is at http://www.edelphy.com/ShowDocumentOK/ShowDocument.html
Please help,
TIA
Message was edited by: me
dimitryous
Message was edited by:
dimitryous// expected results in the JTextField "box"
// AF.PA;36,39;4/5/2007;17h35;+1,25;35,53;36,62;35,52;2547827
// LVMH.PA;84,28;4/3/2007;17h38;+1,16;83,80;84,58;83,32;1963844
import java.applet.AppletContext;
import javax.swing.*;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.awt.event.*;
import java.net.URL;
import java.net.MalformedURLException;
import java.net.URLConnection;
import java.io.*;
public class ShowDocument extends JApplet
implements ActionListener {
the_URLWindow the_URLWindow;
public void init() {
//Execute a job on the event-dispatching thread:
//creating this applet's GUI.
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
createGUI();
} catch (Exception e) {
System.err.println("createGUI didn't successfully complete");
private void createGUI() {
JButton button = new JButton("Bring up the_URL window");
button.addActionListener(this);
add(button);
JFrame.setDefaultLookAndFeelDecorated(true);
the_URLWindow = new the_URLWindow(getAppletContext());
the_URLWindow.pack();
public void destroy() {
//Execute a job on the event-dispatching thread:
//creating this applet's GUI.
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
destroyGUI();
} catch (Exception e) { }
private void destroyGUI() {
the_URLWindow.setVisible(false);
the_URLWindow = null;
public void actionPerformed(ActionEvent event) {
the_URLWindow.setVisible(true);
class the_URLWindow extends JFrame
implements ActionListener {
JTextField the_URL_Field;
JComboBox choice;
AppletContext appletContext;
JTextField box;
public the_URLWindow(AppletContext appletContext) {
super("Show a Document!");
this.appletContext = appletContext;
JPanel contentPane = new JPanel(new GridBagLayout());
setContentPane(contentPane);
contentPane.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
JLabel label1 = new JLabel("the_URL of document to show: ",
JLabel.TRAILING);
add(label1, c);
the_URL_Field = new JTextField("http://fr.finance.yahoo.com/d/quotes.txt?m=PA&f=sl1d1t1c1ohgv&e=.csv&s=AF.PA&s=LVMH.PA", 20);
label1.setLabelFor(the_URL_Field);
the_URL_Field.addActionListener(this);
c.gridwidth = GridBagConstraints.REMAINDER;
c.weightx = 1.0;
add(the_URL_Field, c);
JLabel label2 = new JLabel("Window/frame to show it in: ",
JLabel.TRAILING);
c.gridwidth = 1;
c.weightx = 0.0;
add(label2, c);
String[] strings = {
"(browser's choice)", //don't specify
"My Personal Window", //a window named "My Personal Window"
"_blank", //a new, unnamed window
"_self",
"_parent",
"_top" //the Frame that contained this applet
choice = new JComboBox(strings);
label2.setLabelFor(choice);
c.fill = GridBagConstraints.NONE;
c.gridwidth = GridBagConstraints.REMAINDER;
c.insets = new Insets(5,0,0,0);
c.anchor = GridBagConstraints.LINE_START;
add(choice, c);
box = new JTextField("Results");
//box.setLines(10);
box.setColumns(100);
c.fill = GridBagConstraints.NONE;
c.gridwidth = GridBagConstraints.REMAINDER;
c.insets = new Insets(5,100,100,0);
c.anchor = GridBagConstraints.LINE_START;
add(box, c);
JButton button = new JButton("Show document");
button.addActionListener(this);
c.weighty = 1.0;
c.ipadx = 10;
c.ipady = 10;
c.insets = new Insets(10,0,0,0);
c.anchor = GridBagConstraints.PAGE_END;
add(button, c);
public void actionPerformed(ActionEvent event) {
String the_URL_String = the_URL_Field.getText();
URL the_URL = null;
try {
the_URL = new URL(the_URL_String);
} catch (MalformedURLException e) {
System.err.println("Malformed URL: " + the_URL_String);
if (the_URL != null) {
box.setText("Hellooooooooooo");// *********** Java Compiler error *************
try{
URLConnection conn = the_URL.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null) {
System.out.println(inputLine);
in.close();
} catch (Exception e) {
e.printStackTrace();
if (choice.getSelectedIndex() == 0) {
appletContext.showDocument(the_URL);
} else {
appletContext.showDocument(the_URL,
(String)choice.getSelectedItem());
}Create a HTML page as
<HTML>
<HEAD>
<TITLE>ShowDocument</TITLE>
</HEAD>
<BODY>
<H1>ShowDocument</H1>
<BR>
<APPLET CODE="ShowDocument" WIDTH=600 HEIGHT=50>
If you can see this, your browser does not support Java applets.
</APPLET>
</BODY>
</HTML> -
Simple passing ball applet! HELP
Absolutely a beginner and in need of a bit of help/guidance plz!!!
trying to design a simple game with 2 players who pass a ball between one-another. Once the ball has been passed the player without/ or both players (which ever is simplier) must randomly move to another point in the applet before the next pass. The ball during the pass must move directly to the other player. Every pass adds 1 point to the score. Once score = 5 game finished.
The ball should never bounce around the applet. and there should be no involvement from the user.
cheers
soupssdiffernt to pong in fact that players move all over applet and ball does not move around applet freely.
graeme
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