swingworker | 易学教程

Opening JDialog with SwingWorker?

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问题 I have a project J2SE that use JPA. In some JDialogs I do returns getResultList() and populate JTable, JComboBox, JList etc. at constructor of class. So when I will create any instance for these dialogs sometimes are slow. I think use SwingWorker and JProgressbar and create a (loading) to open JDialogs is a good solution, but I don't know how to do this. I'm trying this. // JProgressbar progress = new JProgressBar(); //custommer dialog JDialog custommer = new JDialog(); //here slow because I

SwingWorker In multithreaded Jframes

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问题 I am creating 4 threads and each thread is associated with a UI. The UI performs a long running task, for that I have used a SwingWorker. But the problem that arises is instead of running as a multithreaded app, it is running in queue. Interesting to note that when I remove the SwingWorker it behaves and runs as multithreaded. My code is as: NewClass package thread; public class NewClass { public static void main(String[] args) throws Exception { for(int i=0; i<4 ; i++) { new ThreadFront()

Best practice to start a swing application

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问题 What is the best practice way to start a java swing application? Maybe there is another way to do it. I want to know if i have to use the SwingUtilities class to start the application (secound possibility) or not (first possibility). public class MyFrame extends JFrame { public void createAndShowGUI() { this.setSize(300, 300); this.setDefaultCloseOperation(EXIT_ON_CLOSE); // add components and stuff this.setVisible(true); } public static void main(String[] args) { // First possibility MyFrame

SwingWorker does not update JProgressBar without Thread.sleep() in custom dialog panel

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I have a SwingWorker class which loads a text file and slices it to chunks for further processing. This is the SwingWorker class: public class ConverterWorker extends SwingWorker<String, String> { private final File f; private final JLabel label; public ConverterWorker(File f, JLabel label) { this.f = f; this.label = label; } @Override protected String doInBackground() throws Exception { NMTMain.convertableData = getDataSets(f); if(!NMTMain.convertableData.isEmpty()) { return "Done"; } else { publish("Failed to load the file!"); return "Failed"; } } @Override public void done() { try { label

WatchService and SwingWorker: how to do it correctly?

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WatchService sounded like an exciting idea ... unfortunately it seems to be as low-level as warned in the tutorial/api plus doesn't really fit into the Swing event model (or I'm missing something obvious, a not-zero probability Taking the code from WatchDir example in the tutorial (simplyfied to handle a single directory only), I basically ended up extend SwingWorker do the registration stuff in the constructor put the endless loop waiting for a key in doInBackground publish each WatchEvent when retrieved via key.pollEvents() process the chunks by firing propertyChangeEvents with the deleted

SwingWorker ProgressBar

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问题 I am trying to get a progress bar to accurately reflect my SwingWorker. But I really can't figure out how to do it. I got the bar to just do a static animation until the operation has completed but I want a real active bar. /* * To change this template, choose Tools | Templates * and open the template in the editor. */ package frglauncher; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import

How do I wait for a SwingWorker's doInBackground() method?

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问题 Say I have the following code: import java.lang.InterruptedException; import javax.swing.SwingWorker; public class Test { private JDialog window; public Test { // instantiate window } private class Task extends SwingWorker<Void, Void> { public Void doInBackground() { try { Thread.currentThread().sleep(5000); } catch(InterruptedException e) {} return null; } } public void doTask() { Task task = new Task(); task.execute(); } protected void process() { // update various GUI components here }

SwingWorker in another SwingWorker's done method

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First, I need to inform you that I am trying my hardest to learn how to code in Java. Its been a little bit difficult, but, I do believe I have it. I have submitted a couple question in the past in regards to SwingWorkers and the like. Each of which I thought I had it, but come to find out that I still had learning to do. Hopefully this time, is not one of those times. With that said, please let me know of anything you see that isn't to standard, or, could lead to problems in the future. Now for the question! I have constructed a JFrame, of which, loads a couple things before it allows the

Java socket swingWorker running but no message received or transmitted

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A few days ago i tried to create a server - client or client Server as an experiment to learn about socket using a thread but then someone told me that i should use swingWorker. I did some research how to use and have implemented it in as practice but it still doesn't work. the swingWorker thread doesn't look like it is running even tho i get a connection and have used .excute(). If you guys can help spot where i am doing wrong that will be great. SwingWorker class is in the startSever() and startClient() method. private void startServer() { SwingWorker <Void, String> runningServer = new

JTextArea appending problems

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Im making a backup program, and I want everything that i have the program backing up displayed on a JTextArea. well, it works, but only after the program is finished with the backup. How do i fix this? The code i have running this is here: backup method public void startBackup() throws Exception { // txtarea is the JTextArea Panel.txtArea.append("Starting Backup...\n"); for (int i = 0; i < al.size(); i++) { //al is an ArrayList that holds all of the backup assignments selected // from the JFileChooser File file = new File((String) al.get(i)); File directory = new File(dir); CopyFolder