I am trying to save the color, text and size (gridheight/gridwidth) of a JLabel in a file. So whenever the program runs I can view past JLabels.
I know how to read/write Strings onto a file but is it possible to save the state of a JLabel?
JLabel is a serialized object, you can save the whole JLabel object in a file using ObjectOutputStream and read it from ObjectInputStream. Like this.
UPDATED THE PREVIOUS CODE ACCORDING TO DataObject CLASS:
public static void main(String[] args) {
// Creating a JLabel
JLabel label = new JLabel("REHAN JAVED");
label.setForeground(Color.RED);
label.setSize(new Dimension(500, 500));
// adding it into the file.
addItIntoFile(new DataObject(label, 200, 50, 0, 1));
// reading file..
DataObject dataObj = readDataObject();
JLabel newLabel = dataObj.getLabel();
int x = dataObj.getXPosition();
// and take all the data from getters.
System.out.println(newLabel.getText()+"\n"+newLabel.getForeground()+"\n"+label.getSize());
}
public static void addItIntoFile(DataObject dataObj) {
File file = new File("data.txt");
try {
file.createNewFile();
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(dataObj);
oos.close();
// You can handle the different exceptions according to you.
} catch (Exception e) {
e.printStackTrace();
}
}
public static DataObject readDataObject() {
DataObject dataObj = null;
try {
ObjectInputStream ois = new ObjectInputStream(new FileInputStream(new File("data.txt")));
dataObj = (DataObject) ois.readObject();
ois.close();
// You can handle the different exceptions according to you.
} catch (Exception e) {
e.printStackTrace();
}
// Handling null data..
if(dataObj == null) {
dataObj = new DataObject(new JLabel(), 0, 0, 0, 0);
}
return dataObj;
}
It will works fine with it. :)
UPDATED VERSION:
To include the grid constraints like width, height, x, and y positions, create a new class and implements the Serializable interface with it and store it directly into the file.
public class DataObject implements Serializable {
private JLabel label;
private int gridWidth;
private int gridHeight;
private int gridXPosition;
private int gridYPosition;
// Your Constructor..
public DataObject(JLabel label, int gridWidth, int gridHeight,
int gridXPosition, int gridYPosition) {
this.label = label;
this.gridWidth = gridWidth;
this.gridHeight = gridHeight;
this.gridXPosition = gridXPosition;
this.gridYPosition = gridYPosition;
}
// your getter and setters...
}
You have to define what you need to save, and how.
What to save
You need to define what is important for you, as an example the color can be the with or without transparency informations.
The text can be a simple string or an object holding informations like character type, size, decorations (bold, underline... ).
How to save
You need to define a format for each information (for example the color can be saved with its name "red" or its hex value "#FF0000" or can be a reference to a custom variable "mainColorTemplate1").
You need also to define a format of the file (xml, json, custom binary, property file, yaml...).
I suggest to try the simplest solution for your knowledge. It is very simple to hold all the data in an object and save it as JSon using libraries like GSon or Faster Jackson.
Here is a possible format in json:
{
"labels": [
{
"text":"My first label",
"x":2,
"y":1,
"color":"#FF0000"
},
{
"text":"My Second label",
"x":4,
"y":3,
"color":"#FFFF00"
}
]
}
One way do it is, by utilizing object Serialization. All Swing components implement Serializable interface. You can save the component and the next time you run the application, the component will be as you left it. Two interesting questions to read about this are: Why is Java Swing serializable? and Swing components and serialization.
I'm trying to create a game from scratch, and my question is directed towards the background image for that said game. This project is probably a precursor for me creating games on a greater scale. In this situation, I'm wanting to change the image it loads for the background depending on what room the game says its in. right now I have two room images, but I can't seem to get it to change the image after it has first been brought up. I don't want to load too big of a file and then use it like a sprite sheet, mainly because I don't want to have framerate issues in the future when the rooms get larger and there is a lot to load as well as the background. My question is, how do I change the image that the background will load in?
I have found several people with the same problem, and there may be answers to this question out there, but I am new-ish to programming so some of the language that is used might be foreign to me.
package com.game.main;
import java.awt.image.BufferedImage;
public class Texture {
SpriteSheet es, ps, ws, bg;
private BufferedImage enemy_sheet = null;
private BufferedImage player_sheet = null;
private BufferedImage weapon_sheet = null;
private BufferedImage background = null;
public BufferedImage[] enemy = new BufferedImage[2];
public BufferedImage[] player = new BufferedImage[9];
public BufferedImage[] weapon = new BufferedImage[9];
public String[] roomim = new String[9];
public BufferedImage room;
public Texture()
{
BuffImLoad loader = new BuffImLoad();
try{
enemy_sheet = loader.loadImage("/SpriteSheetEn1.png");
player_sheet = loader.loadImage("/SpriteSheet.png");
weapon_sheet = loader.loadImage("/SSWeapon.png");
int roomnum = Values.getRoomnum();
background = loader.loadImage(roomloader(roomnum));
}catch(Exception e){
e.printStackTrace();
}
es = new SpriteSheet(enemy_sheet);
ps = new SpriteSheet(player_sheet);
ws = new SpriteSheet(weapon_sheet);
bg = new SpriteSheet(background);
getTextures();
getRoom();
}
private void getTextures(){
enemy[0] = es.grabImage(1,1,56, 53);//idol en1
player[0] = ps.grabImage(1, 1, 34, 50);//temp player image
weapon[0] = ws.grabImage(1, 1, 7, 47);//temp player image
}
private void getRoom(){
room = bg.grabBG(0, 0, 3840 ,2160);
}
private String roomloader(int x){
roomim[0] = ("/Bgtemp.png");
roomim[1] = ("/Bgtemp2.png");
//roomim[1] =
return roomim[x];
}
}
i am learning to write code in java and recently started to write a game as per my assignment.
i have completed almost entire game but stuck with the animation part of the game.
here is what i have done so far,
this is the class that load the image ti display,
public class dpmImage {
private BufferedImage dpm1;
private BufferedImage setDpm1;
public dpmImage() { //this is a constructor
try {
dpm1= ImageIO.read(new File("dpm1Load.png"));
} catch (IOException e) {
e.printStackTrace();
}
setDpm1 = dpm1;
}
private BufferedImage dpm1ImageGet() {
return setDpm1;
}
}
the following code is from main class (Main.java)
private Graphics cGraphcs;
cGraphcs.drawImage(dpmImageInstance.dpm1ImageGet(), 0, 0, null);
The code is working fine and displays the image.
Now, I am allowed to modify anything in dpmImage class but not allowed to modify anything in Main.java and still make this image animate. So I create an array of BufferedImage in dpmImage class and add a second image in the array as follows,
public class dpmImage {
private BufferedImage [] dpm1 = new BufferedImage[2];
private BufferedImage setDpm1;
public dpmImage() { //this is a constructor
try {
dpm1[0]= ImageIO.read(new File("dpm1Load.png"));
dpm1[1]= ImageIO.read(new File("dpm1Load1.png"));
} catch (IOException e) {
e.printStackTrace();
}
setDpm1 = dpm1[0];
setDpm1 = dpm1[1];
}
private BufferedImage dpm1ImageGet() {
return setDpm1;
}
}
But i couldn't get to animate it from first image to 2nd. Can someone please give me any hints on that ? i am not allowed to change the Main.java class
You always return the same BufferedImage from the dpm1ImageGet method. You need to get the instance from the array. Based on the frequency of the update, you can simply use an index like
private int indexImage = 0;
private BufferedImage dpm1ImageGet() {
indexImage = ( indexImage + 1 ) % dpm1.length; //increment and use % to prevent any ArrayOutOfBoundsException
return dpm1[indexImage];
}
Each call will return the next image. Of course, this depends on when you want to get the other image. It could be anything.
This has been driving me up the wall for 2 days now. I can't seem to make the JProgressBar update properly and I'm not sure why. I've read through the concurrency and SwingWorker tutorials, I've tested outside of my program and been able to get it working fine using simple code. I understand the concepts, and am just not seeing why it's not working as the code has been re-written in many different ways and still I can't make it work. I'll post a SSCE using as much code from my program as I can, and explain things best I can here as well.
Basically I have a auto-updater/Installer program to update and/or install World of Warcraft addons to our customers computers. The first thing the 'updater' does is check the server to see if it's version is the same as the version of the updater installer on the server. This works swimmingly! In fact the entire updater works great except for this one issue. If the updater sees that the server has a different version number than the updater it downloads the installer (in a zip) from the server, unzips it, starts the installation from the exe that was contained in the zip and closes the currently open updater so the install can complete properly.
So I have a progress bar on the card (using cardLayout to show the three different cards for the updater, SelfUpdate, Login, and AddonList) for the self updater. as well as a JTextArea below the JProgressBar and that's all that shows on the particular SelfUpdate card. It query's the server for the version number on the server and it compares that version to the version number on the updater currently installed. If the version is the same it changes to the Login card and moves along to the next bits of the program, which work great so far, if the versions are different it sends a query to the server and the server sends the zip file back to the updater for processing.
This is where it's not working. The zip is a decent size and of course I want to show the progress of this download. The zip file download works fine (it runs in the SwingWorker doInBackground() method), the updater then unzips the installer.exe file to a folder on the customers system drive, fires off using Runtime and starts the installer.exe which pops up the installer screen, then closes the current updater using System.exit(0). again, all this works but the JProgressBar itself will NOT update. it sits at 0% for the whole thing. Also, the taskOutput JTextArea doesn't get updated either, but the main problem is the progressbar not updating. I can live with that getting fixed and the JTextArea not updating. (tried a JLabel in place of a textarea as well and no joy)
So I know I'm doing something wrong, but I can't imagine what. Here's the bits where the magic happens. :) Forgive me if I explain as I go along here.
So Controller.java handles all the flow of the program here's the parts you need to see.
// Imports packages needed for use in this file.
import javax.swing.*;
import java.awt.CardLayout;
import java.io.*;
// class instantiation
public class Controller {
// Variables needed for use in this class
private static Updater util;
private static int loginReturnState = 0;
/**
* Single contructor for this class
*/
public Controller() {
}
/**
* Main method which runes everything in the updater program
*
*/
public static void main(String[] args) {
util = new Updater();
// Schedule a job for the event dispatch thread.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
// setup a new GUI
util.createGUI();
JFrame rFrame = util.getRootFrame();
JPanel gFrame = util.getCardLayoutFrame();
CardLayout cards = (CardLayout) gFrame.getLayout();
cards.show(gFrame, "UpdateUpdaterPanel");
rFrame.pack();
rFrame.setLocationRelativeTo(null);
rFrame.setVisible(true);
SelfUpdater selfUp = new SelfUpdater();
int needUpdate = selfUp.checkForUpdate(); if (needUpdate == 2) {// Update available for download. Download it.
selfUp.downloadUpdate();
}
}
});
}
}
OK Next file is the Updater class. To put code in here that will hopefully compile and show the issue I need to put this class in there or the utility methods I have in the uPdater class will not be around to be called and I use them extensively.
// Packages needed for use in this file
import javax.swing.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.*;
import java.awt.CardLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseAdapter;
import java.io.*;
// Class instantiation
public class Updater {
// These final variables are set to the path for each of the images used
public static final String BG_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\background.png";
public static final String APP_ICON_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\app-icon.png";
public static final String CLOSE_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\close.png";
public static final String FINOFF_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\FinishedOff.png";
public static final String FINON_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\FinishedOn.png";
public static final String ICON_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\icon.png";
public static final String ICON64_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\icon64x64.png";
public static final String ICON256_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\icon256x256.png";
public static final String INSTOFF_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\InstallUpdatesOFF.png";
public static final String INSTON_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\InstallUpdatesON.png";
public static final String LOGO_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\logo.png";
public static final String MIN_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\minimize.png";
public static final String PROGBACK_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\ProgressBackground.png";
public static final String PROGBAR_IMAGE_PATH = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\ProgressBar.png";
public static final String INSTRUCTIONS_BUTTON = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\instructions.png";
public static final String PURCHASE_BUTTON = "F:\\Java Programs\\Updater\\src\\com\\dynastyaddons\\updater\\images\\Purchase.png";
// These are various final variables for use throughout the updater
public static final String URL_CONNECT = "http://dynastyaddons.com/api/index2.php?";
public static final String TITLE_TEXT = "Dynasty Updater";
public static final int BUFFER_SIZE = 4096;
public static final double UPDATER_VERSION = 1.1;
// Public variables needed for this class workings
private static JFileChooser fc;
private static JFrame rootFrame;
// Private variables for this class use alone
private static String PHPSessionID;
private static boolean debugToggle = true;
private CardLayout cards;
private JPanel guiFrame;
private Point mouseDownCompCoords;
private Login login;
private Addons addons;
/**
* Sole contructor. (For invocation by subclass contructors, typically implicit.)
*/
public Updater() {
// First instantiate any variables needed
PHPSessionID = "notset";
guiFrame = new JPanel();
cards = new CardLayout();
guiFrame.setLayout(cards);
}
// Various methods follow
/**
* This will create the root gui for showing in the main method
*
*/
public void createGUI() {
rootFrame = new JFrame();
SpringLayout rootLayout = new SpringLayout();
// setup root frame
rootFrame.setUndecorated(true);
rootFrame.setBackground(new Color(0,0,0,0));
rootFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
rootFrame.setPreferredSize(new Dimension(800,600));
rootFrame.setTitle(TITLE_TEXT);
// add the background image
JLabel bg = new JLabel(new ImageIcon(BG_IMAGE_PATH));
bg.setLayout(rootLayout);
rootFrame.add(bg);
// setup title bar
mouseDownCompCoords = null;
mouseDownCompCoords = null;
rootFrame.addMouseListener(new MouseListener() {
public void mouseReleased(MouseEvent e){ mouseDownCompCoords = null; }
public void mousePressed(MouseEvent e){ mouseDownCompCoords = e.getPoint(); }
public void mouseExited(MouseEvent e){}
public void mouseEntered(MouseEvent e){ }
public void mouseClicked(MouseEvent e){ }
});
rootFrame.addMouseMotionListener(new MouseMotionListener() {
public void mouseMoved(MouseEvent e){}
public void mouseDragged(MouseEvent e){
Point currCoords = e.getLocationOnScreen();
rootFrame.setLocation(currCoords.x - mouseDownCompCoords.x, currCoords.y - mouseDownCompCoords.y);
}
});
// Display and place the logo
JLabel logo = new JLabel(new ImageIcon(LOGO_IMAGE_PATH));
bg.add(logo);
// add Close and Minimize buttons
JPanel cmButt = createCloseAndMinButtons();
bg.add(cmButt);
// create card frame
guiFrame.setPreferredSize(new Dimension(800, 435));
guiFrame.setOpaque(false);
bg.add(guiFrame);
// Constrain the parts of your BG
rootLayout.putConstraint(SpringLayout.WEST, logo, 30, SpringLayout.WEST, rootFrame);
rootLayout.putConstraint(SpringLayout.NORTH, logo, 70, SpringLayout.NORTH, rootFrame);
rootLayout.putConstraint(SpringLayout.NORTH, cmButt, 0, SpringLayout.NORTH, rootFrame);
rootLayout.putConstraint(SpringLayout.EAST, cmButt, 0, SpringLayout.EAST, rootFrame);
rootLayout.putConstraint(SpringLayout.SOUTH, guiFrame, 0, SpringLayout.SOUTH, rootFrame);
rootLayout.putConstraint(SpringLayout.WEST, guiFrame, 0, SpringLayout.WEST, rootFrame);
rootLayout.putConstraint(SpringLayout.EAST, guiFrame, 0, SpringLayout.EAST, rootFrame);
// Create self updater panel and get it ready to show
SelfUpdater selfUp = new SelfUpdater();
JPanel selfUpd = selfUp.getSelfUpdatePanel();
// get the cardlayout and add the three panels to it, then show the self-updater to begin.
guiFrame.add(selfUpd, "UpdateUpdaterPanel"); }
/**
* Creates a panel which has the close and minimize buttons on it.
*/
private static JPanel createCloseAndMinButtons() {
JPanel a = new JPanel();
SpringLayout closeLO = new SpringLayout();
a.setLayout(closeLO);
a.setPreferredSize(new Dimension(150,150));
a.setOpaque(false);
// Close Button
JButton cButt = new JButton(new ImageIcon(Updater.CLOSE_IMAGE_PATH));
cButt.setBorderPainted(false);
cButt.setContentAreaFilled(false);
cButt.setFocusPainted(false);
cButt.setOpaque(false);
cButt.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) { System.exit(0); }
});
a.add(cButt);
// Minimize Button
JButton mButt = new JButton(new ImageIcon(Updater.MIN_IMAGE_PATH));
mButt.setBorderPainted(false);
mButt.setContentAreaFilled(false);
mButt.setFocusPainted(false);
mButt.setOpaque(false);
mButt.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) { rootFrame.setState(JFrame.ICONIFIED); }
});
a.add(mButt);
// Constrain parts on panel
closeLO.putConstraint(SpringLayout.EAST, cButt, 12, SpringLayout.EAST, a);
closeLO.putConstraint(SpringLayout.NORTH, cButt, -2, SpringLayout.NORTH, a);
closeLO.putConstraint(SpringLayout.EAST, mButt, 30, SpringLayout.WEST, cButt);
closeLO.putConstraint(SpringLayout.NORTH, mButt, -2, SpringLayout.NORTH, a);
// Return the jframe
return a;
}
/**
* Returns the guiFrame which holds the cardlayout for the changing of the panels.
*
* #return JPanel Returns the frame which holds the cardlayout.
*/
public JPanel getCardLayoutFrame() {
return guiFrame;
}
/**
* This will return the cardlayout for use in the controller.
*
* #return CardLayout Returns the cardlayout for use in the Controller.
*/
public CardLayout getCardLayout() { return cards; }
/**
* Returns the current version of this updater as a double
*
* #return the version of this updater as a double.
*/
public double getUpdaterVersion() { return UPDATER_VERSION; }
/**
* Returns a string that tells if the customer is useing windows or mac
*
* #return the operating system in use by the customer
*/
public static String getOSType() {
String retString = "";
String oST = System.getProperty("os.name").toLowerCase();
int spacePos = oST.indexOf(" ");
if (spacePos > 0) {
retString = oST.substring(0, spacePos);
}
retString.trim();
return retString;
}
/**
* Returns the main root frame for display purposes in controller.java
*
* #return JFrame returns rootFrame.
*/
public JFrame getRootFrame() { return rootFrame; }
}
OK< Keep in mind this class really just does some utility stuff in the background and likely isn't involved in anything other than creatin the background gui and tellin the SelfUpdate card to show up.
Finally here's the SelfUpdater.java file which displays the SelfUpdater panel with the progress bar in it and does all the server querying which works fine again. Pay attention to the System.out.println debug statements I have in the downloadUpdate method (which is called in the controller file), as they work fine and print out in the console no problem. The selfUpdateProgress.setValue(int) and taskOutput.setText(txt) statements in that method do nothing .Also I've put a println in the doInBackground where it does setProgress(int) and that prints to the console fine but the bar doesn't update with setProgress. Here it is.
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
import java.util.zip.*;
// Create and start class
public class SelfUpdater extends JPanel {
// These are the variables needed for use in this class
private JPanel selfUpdatePanel;
private JProgressBar selfUpdateProgress;
private Task task;
private JTextArea taskOutput;
private Updater util;
/**
* Default class constructor, instantiates variables and sets up GUI.
*
*
**/
public SelfUpdater() {
// Progress Bar
selfUpdateProgress = new JProgressBar(0, 100);
selfUpdateProgress.setValue(0);
selfUpdateProgress.setStringPainted(true);
selfUpdateProgress.setPreferredSize(new Dimension(470,29));
// Layout
SpringLayout selfUpdateLayout = new SpringLayout();
SpringLayout pBarLayout = new SpringLayout();
// Font and color setup for Task Output
Font myFont = new Font("Serif", Font.BOLD, 16);
Color myColor = new Color(255, 170, 0);
// Description of progress pane
taskOutput = new JTextArea("Checking server for updates to the updater.", 1, 39);
taskOutput.setFont(myFont);
taskOutput.setForeground(myColor);
taskOutput.setEditable(false);
taskOutput.setOpaque(false); // this is false after setting up the window.
//extras needed for the class workings
util = new Updater();
// Images for progress bar setup
JLabel pBar = new JLabel(new ImageIcon(util.PROGBACK_IMAGE_PATH));
pBar.setOpaque(false);
//pBar.setLayout(pBarLayout);
//pBar.add(taskOutput);
//pBar.add(selfUpdateProgress);
// Main panel
selfUpdatePanel = new JPanel();
selfUpdatePanel.setPreferredSize(new Dimension(800, 435));
selfUpdatePanel.setLayout(selfUpdateLayout);
selfUpdatePanel.setOpaque(false);
selfUpdatePanel.add(taskOutput);
selfUpdatePanel.add(selfUpdateProgress);
selfUpdatePanel.add(pBar);
// Constrain your bits.
// First constrain PBar to the self update panel
selfUpdateLayout.putConstraint(SpringLayout.SOUTH, pBar, -40, SpringLayout.SOUTH, selfUpdatePanel);
selfUpdateLayout.putConstraint(SpringLayout.WEST, pBar, 150, SpringLayout.WEST, selfUpdatePanel);
selfUpdateLayout.putConstraint(SpringLayout.SOUTH, taskOutput, -50, SpringLayout.SOUTH, selfUpdatePanel);
selfUpdateLayout.putConstraint(SpringLayout.WEST, taskOutput, 175, SpringLayout.WEST, selfUpdatePanel);
selfUpdateLayout.putConstraint(SpringLayout.SOUTH, selfUpdateProgress, -84, SpringLayout.SOUTH, selfUpdatePanel);
selfUpdateLayout.putConstraint(SpringLayout.WEST, selfUpdateProgress, 171, SpringLayout.WEST, selfUpdatePanel); }
/**
* Will return the jpanel that contains the gui elements for the Self-Update
*
* #return JPanel The Self-Update gui.
*
*/
public JPanel getSelfUpdatePanel() { return selfUpdatePanel; }
/**
* This will check the server to see if an update is available for the updater
*
* #return int Returns an int that will describe the answer from the server.
* Possible Return values:
* 0 = Problem checking for update: Server return NULL
* 1 = Second type of problem checking for update: Server returned empty string
* 2 = Update available.
* 3 = Update not needed.
*
*/
public int checkForUpdate() {
// ask the server what version it's updater is.
String serverUpdaterVersion = "";
try {
HttpConnect conn = new HttpConnect();
String urlRequest = util.URL_CONNECT + "action=get_updater&platform=" + util.getOSType();
serverUpdaterVersion = conn.textRequest(urlRequest, 1);
} catch (MalformedURLException e) {
JOptionPane.showMessageDialog(null, "We were unable to connect to the server while checking for an updater update, please check your internet connection.", "Attention!",JOptionPane.ERROR_MESSAGE);
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "We were unable to open the connection to the server while checking for an updater update, please check your internet connection.", "Attention!",JOptionPane.ERROR_MESSAGE);
}
// check for errors and return proper int.
if (serverUpdaterVersion == null) { // There is an error if the server returns null, return 0
return 0;
} else if (serverUpdaterVersion.equals("")) { // if the server returns an empty string return 1 for an error
return 1;
} else { // not null or empty string. check versions
// Check version of this updater to servers version
double sVers = Double.parseDouble(serverUpdaterVersion);
if((double)sVers == util.getUpdaterVersion()) { // return 3 if no update needed here.
return 3;
} else { // otherwise return 2 so we can get the update
return 2;
}
}
}
/**
* This will download the update from the server.
*
* #return File The downloaded file from the server. A zip file usually.
*
*/
public void downloadUpdate() {
// turn on wait cursor
util.getRootFrame().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
// start a new task which does the download
// Instances of javax.swing.SwingWorker are not reusuable, so
// we create new instances as needed.
task = new Task();
// add a property listener to the task so it knows to update the progress meter.
task.addPropertyChangeListener(new PropertyChangeListener() {
#Override
public void propertyChange(PropertyChangeEvent evt) {
switch(evt.getPropertyName()) {
case "progress":// set the progress value and the task output value.
selfUpdateProgress.setIndeterminate(false);
int prg = (Integer) evt.getNewValue();
selfUpdateProgress.setValue(prg);
taskOutput.setText("Downloading and unzipping update. Progress = " + prg + "%");
System.out.println("Percent progress: " + prg + "%");
break;
}
}
});
// execute or start the task.
task.execute();
}
/**
* This method will unzip the downloaded file, and start the installation.
* Then it will close this program while the installation completes.
*
*
*/
public void unzipNewUpdater() {
// create strings for naming the zip file to open up and where to put it.
String zipFile = "NewUpdater.zip";
String outputFolder = System.getenv("SystemDrive") + "\\DynastyAddons";
// Try the unzipping and catch any errors.
try {
// Setup the input stream and get the entry ready to unzip.
ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFile));
ZipEntry ze = zis.getNextEntry();
// loop to open each entry and output it to the output folder and file.
while(ze!=null) {
// Get the name
String entryName = ze.getName();
// get the file to unzip
File f = new File(outputFolder + File.separator + entryName);
// Create folders needed to hold the unzipped stuff
f.getParentFile().mkdirs();
// get output stream setup to copy the file to from the zip
FileOutputStream fos = new FileOutputStream(f);
// get length of file to make sure we get the whole thing moved
int len;
byte buffer[] = new byte[1024];
// loop thru the entry writing the whole file to the output directory
while((len = zis.read(buffer)) > 0){
fos.write(buffer, 0, len);
}
// close the output stream and get the next entry ready for the next iteration of the loop.
fos.close();
ze = zis.getNextEntry();
}
// close the entry and input stream since we're done.
zis.closeEntry();
zis.close();
} catch (FileNotFoundException ex) {
// throw error
} catch (IOException ex) {
// throw error
}
}
// This private class handles the download and unzip of the new updater if needed.
class Task extends SwingWorker<Void, Void> {
#Override
public Void doInBackground() {
try {
HttpConnect conn = new HttpConnect();
String downloadURL = util.URL_CONNECT + "action=download_updater&platform=" + util.getOSType();
conn.downloadFile(downloadURL);
InputStream inputStream = conn.getInputStream();
FileOutputStream outputStream = new FileOutputStream(System.getenv("SystemDrive") + "\\DynastyAddons\\NewUpdater.zip");
byte[] buffer = new byte[util.BUFFER_SIZE];
int bytesRead = -1;
long totalBytesRead = 0;
int percentCompleted = 0;
long fileSize = conn.getContentLength();
taskOutput.setText("Downloading Newest Updater.");
//setProgress(0);
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
totalBytesRead += bytesRead;
percentCompleted = (int) (totalBytesRead * 100 / fileSize);
setProgress(percentCompleted);
}
outputStream.close();
conn.disconnect();
} catch (IOException ex) {
JOptionPane.showMessageDialog(util.getRootFrame(), "Error downloading Updater file. Please send this entire error to support#dynastyaddons.com. \n Error: " + ex.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
setProgress(0);
}
return null;
}
#Override
public void done() {
// Create msg window saying update downloaded.
JOptionPane.showMessageDialog(util.getRootFrame(), "The new updater has been downloaded. \nClick OK to close this updater and start the installation of the new version.", "Attention", JOptionPane.PLAIN_MESSAGE);
// Unzip the updater
unzipNewUpdater();
// Tell the cursor we're not busy anymore
setProgress(100);
selfUpdateProgress.setValue(100);
taskOutput.setText("Done Downloading New Updater. Installing...");
util.getRootFrame().setCursor(null);
// Create command used to open the udpater installer.
String cmd = "cmd /c " + System.getenv("SystemDrive") + "\\DynastyAddons\\InstallDynastyAddonsUpdater.exe";
// Here is where we run the exe that will install the new updater.
try{
Runtime.getRuntime().exec(cmd);
}catch (FileNotFoundException ex){
// handle this error
}catch (IOException ex) {
// handle this error
}
// Now close this updater so the new one can install.
System.exit(0);
}
}
}
I'm hopin it'll all compile properly if you need to see it working. If not let me know and i'll update stuff to make it work on a compile. So I've tried a number of things, making the SelfUpdater class implement PropertyChangeListener and implementing PropertyChange(event), I've tried feeding the JProgressBar to a constructor in the Task class. I've tried outputting an Integer in the SwingWorker and using Publish and Process to update the taskOutput and JProgressBar, I've tried re-writing the whole damn class to fix up the code and make it eaiser to pick out issues. I've done tests using the tutorials and some of my code to make it work (they worked great) but every time I come back to my updater code here, the darn progressbar wont update. I'm really prayin someone can give me a bit of insight on this problem so I can wrap up this project and start on something new! This is the very last thing I have to fix (unless there's problems on the Mac) and I'm done it and can go back to testing and getting it distributed to our customers.
Feel more than free to comment on any part of the code as well (anything I maybe did stupid or something) I'm always lookin for critisim on my code especially if I'm not doing something according to good design and.. ugh brain froze forgot the word here. and definitely if more info is needed I can easily just paste in all the code in the 7 classes that make up this updater.
It all compiles, and works fine, except this jprogressbar wont display the progress, even tho I can get it to pring out in the console. Thank you in advance, sorry for the mini-novel here, Haven't had to ask a question yet, and have been able to figure everything eout from other peoples questions and answers, just stumped now and ready to be done with this! :D
I apologize in advance if I've screwed something up in the post here, remember it's my first post and while I've read hundreds of them, I'm sure my noobness has messed something up so feel free to castigate me for my mistakes so I can fix them. :)
EDIT Updated the selfUpdater.java to reflect using of only one spring layout.
What you have there are layout problems, not anything SwingWorker related. The JProgressBar is updating nicely, you just can't see it.
Check your main method. You are creating two instances of SelfUpdater, adding one to your GUI and updating the other.
public static void main(String[] args) {
util = new Updater(); // <-- don't do this, it calls Swing code from a thread that is not EDT
// Schedule a job for the event dispatch thread.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
// setup a new GUI
util.createGUI(); // <-- creates an instance of SelfUpdater and adds it to GUI
JFrame rFrame = util.getRootFrame();
JPanel gFrame = util.getCardLayoutFrame();
CardLayout cards = (CardLayout) gFrame.getLayout();
cards.show(gFrame, "UpdateUpdaterPanel");
rFrame.pack();
rFrame.setLocationRelativeTo(null);
rFrame.setVisible(true);
SelfUpdater selfUp = new SelfUpdater(); // <-- creates another instance
int needUpdate = selfUp.checkForUpdate();
if (needUpdate == 2) {// Update available for download. Download it.
selfUp.downloadUpdate();
}
}
});
}
You can't expect components to be shown, if they are not added anywhere. :)
Have you tried to put the updating code of the jProgressBar in an extra thread? http://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html
I had a similar problem once, the progressbar didn't progress and when it was all done, the progressbar showed 100%.
I want to call the return statement tempimage in load_picture by passing it to showWindow, but I'm not sure how. heres a snippet of my code. edit:
i guess what I'm trying to say is, I'm not exactly sure what to do with the hardcoded "picture1.gif". I understand that I need to call a method to load the image, but I'm not too sure what to put in place of it.
:
package project3;
import java.util.Scanner;
import javax.swing.;
import java.awt.;
import java.net.*;
public class Project3 {
//initializing global
static Project3 theobject = new Project3();
final static int MIN_NUMBER=1;
final static int MAX_NUMBER=8;
static int image_number=1;
static Image theimage;
// This routine will load an image into memory, non-static requires an object
// It expects the name of the image file name and a JFrame passed to it
// It will assume an Internet conection is available
// It can only be called AFTER the program object has been created
// It will return a type Image variable, call it like this: theimage = object.load_picture("picture1.gif", frame);
// (hard code 'picture1.gif' only when testing - USE a method or variable for 'real' call)
// This code requires you to do an 'import java.awt.*' and an 'import java.net.*'
// Note: this method is using parameter and return type for input/output
// This routine will load an image into memory, non-static requires an object
// It expects the name of the image file name and a JFrame passed to it
// It will assume an Internet conection is available
// It can only be called AFTER the program object has been created
// It will return a type Image variable, call it like this: theimage = object.load_picture("picture1.gif", frame);
// (hard code 'picture1.gif' only when testing - USE a method or variable for 'real' call)
// This code requires you to do an 'import java.awt.*' and an 'import java.net.*'
// Note: this method is using parameter and return type for input/output
public Image load_picture(String imagefile, JFrame theframe)
{
Image tempimage;
// Create a MediaTracker to inform us when the image has
// been completely loaded.
MediaTracker tracker;
tracker = new MediaTracker(theframe);
// getImage() returns immediately. The image is not
// actually loaded until it is first used. We use a
// MediaTracker to make sure the image is loaded
// before we try to display it.
String startURL;
if (imagefile.startsWith("http"))
startURL = "";
else
startURL = "http://www.canyons.edu/departments/comp_sci/ferguson/cs111/images/";
URL myURL=null;
try
{
myURL = new URL(startURL + imagefile);
}
catch(MalformedURLException e) {
System.out.println("Error caught " + e.toString());
}
//tempimage = getImage(myURL); // JApplet version
tempimage = Toolkit.getDefaultToolkit().getImage(myURL); // stand alone program version
// Add the image to the MediaTracker so that we can wait for it
tracker.addImage(tempimage, 0);
try { tracker.waitForID(0); }
catch ( InterruptedException err) { System.err.println(err); }
return tempimage;
}
// This class/method uses a global variable that MUST be set before calling/using
// note: You can not call the paint routine directly, it is called when frame/window is shown
// look up the repaint() routine in the book
// Review Listings 8.5 and 8.6
//
public static class MyPanel extends JPanel {
public void paintComponent (Graphics g) {
JPanel panel= new JPanel();
int xpos,ypos;
super.paintComponent(g);
// set the xpos and ypos before you display the image
xpos = 300; // you pick the position
ypos = 200; // you pick the position
if (theimage != null) {
g.drawImage(theimage,xpos,ypos,this);
// note: theimage global variable must be set BEFORE paint is called
}
}
}
public static void showWindow( String filename ) {
// create, size and show a GUI window frame, you may need to click on taskbar to see window
//display the filename in the title of the window frame, otherwise the window will be blank (for now)
JFrame frame1= new JFrame();
theimage = theobject.load_picture("picture1.gif", frame1);
//"picture1.gif" is hardcoded, I want to call this using a method
frame1.setTitle(filename);
frame1.setSize(440,302);
frame1.setLocation(400,302);
frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame1.setVisible(true);
}
Any help is appreciated. Thanks
The value that is returned by the load_picture method can be sent directly to the showWindow method, or you can assign it to a variable:
String filename = "your/filename";
JFrame theFrame = new JFrame();
Project3 project = new Project3();
MyPanel.showWindow(project.load_picture(filename, theFrame);
From within the showWindow method, just call the load_picture method as follows:
Image tempImage = load_picture(filename, frame1);
From here you can do anything you like with the tempImage object.