这已经让我呆了两天了。我似乎无法正确更新JProgressBar，也不确定为什么。我已经阅读了并发和SwingWorker教程，已经在程序外部进行了测试，并能够使用简单的代码使其正常工作。我理解这些概念，只是不明白为什么它不起作用，因为已经以许多不同的方式重写了代码，但我仍然无法使它起作用。我将使用程序中尽可能多的代码发布SSCE，并在此处尽我所能解释最好的事情。
基本上，我有一个自动更新程序/安装程序，可以向我们的客户计算机更新和/或安装《魔兽世界》插件。 “更新程序”要做的第一件事是检查服务器，以查看其版本是否与服务器上更新程序安装程序的版本相同。这工作顺畅！实际上，除此问题外，整个更新程序都很好用。如果更新程序发现服务器的版本号与更新程序的版本号不同，则从服务器下载安装程序（以zip格式），解压缩，从zip文件中包含的exe开始安装并关闭当前打开的更新程序，因此安装可以正确完成。
因此，我在卡上有一个进度栏（使用cardLayout为更新器显示了三个不同的更新器卡，SelfUpdate，Login和AddonList）。以及JProgressBar下面的JTextArea，这些都显示在特定的SelfUpdate卡上。它在服务器上查询服务器上的版本号，并将该版本与当前安装的更新程序上的版本号进行比较。如果版本相同，则更改为登录卡，然后移至该程序的下一个位，到目前为止，该位都有效，如果版本不同，则它向服务器发送查询，服务器将zip文件发送回更新程序进行处理。
这是行不通的地方。该zip大小合适，我当然想显示下载进度。 zip文件下载工作正常（它在SwingWorker doInBackground（）方法中运行），然后更新程序将installer.exe文件解压缩到客户系统驱动器上的文件夹中，使用运行时启动并启动installer.exe，这会弹出安装程序屏幕，然后使用System.exit（0）关闭当前更新程序。同样，所有这些都可以，但是JProgressBar本身不会更新。整件事占0％。另外，taskOutput JTextArea也不更新，但主要问题是进度条未更新。我可以忍受这种修复，而JTextArea不会更新。 （也尝试过使用JLabel代替文本区域，并且没有喜悦）
所以我知道我做错了，但是我无法想象。这是魔术发生的地方。 :)如果我在这里讲解，请原谅我。
因此，Controller.java处理程序的所有流程，这是您需要查看的部分。
// 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();
}
}
});
}
}
确定下一个文件是Updater类。将代码放入希望可以编译并显示问题的代码中，我需要将此类放入其中，否则将无法调用uPdater类中拥有的实用程序方法，因此我会大量使用它们。
// 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 <请记住，此类实际上只是在后台执行一些实用程序，并且除了在后台gui中创建并告诉SelfUpdate卡显示以外，可能不涉及任何其他事情。
最后，这是SelfUpdater.java文件，该文件显示带有进度条的SelfUpdater面板，并执行所有服务器查询，这又可以正常工作。请注意我在downloadUpdate方法（在控制器文件中称为）中包含的System.out.println调试语句，因为它们可以正常工作并且可以在控制台中打印出来，没有问题。该方法中的selfUpdateProgress.setValue（int）和taskOutput.setText（txt）语句不执行任何操作。此外，我还将println放在doInBackground中，在该处它执行setProgress（int）并可以打印到控制台，但工具栏不起作用。用setProgress更新。这里是。
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 [email protected]. \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);
}
}
}
我希望，如果您需要查看它们的运行情况，它们都可以正确编译。如果没有，请告诉我，我将进行更新以使它在编译时有效。因此，我尝试了很多事情，使SelfUpdater类实现PropertyChangeListener并实现PropertyChange（event），并尝试将JProgressBar馈送到Task类中的构造函数。我尝试在SwingWorker中输出一个Integer，并使用“发布和处理”来更新taskOutput和JProgressBar，我尝试重新编写整个该死的类以修正代码，并使其更容易找出问题。我已经使用教程和一些代码进行了测试，以使其正常工作（它们工作得很好），但是每次我回到这里的更新程序代码时，该进度条都不会更新。我真的很祈祷有人可以给我一些关于这个问题的见解，这样我就可以结束这个项目并开始一些新的事情！这是我必须修复的最后一件事（除非Mac上有问题），并且我已经完成了，可以返回测试并分发给我们的客户。
我也很乐于对代码的任何部分发表评论（我可能做过的任何愚蠢的事情），我总是在批评我的代码，特别是如果我没有根据良好的设计做某事的话。冻结这里忘记了这个词。当然，如果需要更多信息，我可以轻松地粘贴组成该更新程序的7个类中的所有代码。
一切都可以编译，并且工作正常，除了这个jprogressbar不会显示进度，即使我可以在控制台中将其打印出来。在此先感谢您，为这里的迷你小说感到抱歉，还没有问过一个问题，并且已经能够弄清别人的问题和答案中的所有内容，现在已经迷住了，并准备好了！ ：D
如果我在此处张贴了一些错误的内容，我事先表示歉意，请记住这是我的第一篇文章，虽然我已经阅读了数百篇文章，但是我敢肯定，我的傻瓜弄乱了某些内容，请随时为我的错误提起公诉这样我可以解决它们。 🙂
编辑更新了selfUpdater.java以反映仅使用一种弹簧布局。
参考方案
您所遇到的是布局问题，与SwingWorker无关。 JProgressBar的更新很好，您看不到它。
检查您的主要方法。您正在创建两个SelfUpdater实例，将其中一个添加到GUI并更新另一个。
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();
}
}
});
}
如果未将组件添加到任何地方，则不能期望它们会被显示。 🙂
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