Java Swing 多线程和 ui 冻结
这个想不通啊使用worker或invokeLater，UI仍然冻结。下载每个文件后，我想要更新 JList。但 JList 仅在踏步返回后才会更新。
这是代码：
public class MyUi extends javax.swing.JFrame{
...
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt){
SwingUtilities.invokeLater(new Runnable() {
//To get out of the event tread
public void run() {
dl();
}
});
}
private void dl(){
...
//ini and run the download class
Download myDownload = new Download();
myDownload.doDownload(myDlList);
}
public void updateJlist(String myString){
myModel.addElement(myString);
jList1.repaint();
}
}
public class Download{
...
public void doDownload(String[] fileName){
for(int i=0; i<fileName.length; i++){
...//download action...
//for my jList1 to be updated after each file.
MyUi.updateJlist(fileName[i]);
}
}
}
任何示例都会有帮助。
Can't figure this one out. Using worker or invokeLater, the UI still freeze. After each file is downloaded, I want a JList to be updated. But the JList will only update after the tread returns.
Here is the code:
public class MyUi extends javax.swing.JFrame{
...
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt){
SwingUtilities.invokeLater(new Runnable() {
//To get out of the event tread
public void run() {
dl();
}
});
}
private void dl(){
...
//ini and run the download class
Download myDownload = new Download();
myDownload.doDownload(myDlList);
}
public void updateJlist(String myString){
myModel.addElement(myString);
jList1.repaint();
}
}
public class Download{
...
public void doDownload(String[] fileName){
for(int i=0; i<fileName.length; i++){
...//download action...
//for my jList1 to be updated after each file.
MyUi.updateJlist(fileName[i]);
}
}
}
Any example would help.
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评论（3）
invokeLater的作用与您期望的完全相反 - 它在 EDT 上运行操作，这解释了该行为。invokeLaterdoes exactly the opposite of what you expect it to do - it runs operations on the EDT, which explains the behaviour.在后台线程上下载文件并将
updateJlist()包装在Runnable中。SwingWorker会更可靠。附录：正如 @mre 所说，
SwingWorker还可以轻松报告中期结果，如此处。Download the file on a background thread and wrap just
updateJlist()in aRunnable.SwingWorkerwould be more reliable.Addendum: As @mre notes,
SwingWorkeralso makes it easy to report interim results, as shown here.我创建了一个 WorkerThread 类来处理线程和 GUI 当前/主线程。当事件触发启动 XXXServer 时，我已将 GUI 应用程序放入 WorkerThread 的 construct() 方法中，然后所有线程都被激活，并且 GUI 可以顺利工作而不会冻结。看看吧。
/** * 动作事件 * * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent) */
public void actionPerformed(ActionEvent ae) {
log.info("actionPerformed 开始..." + ae.getActionCommand());
}
I have create a WorkerThread class which take care of Threads and GUI current/main thread . i have put my GUI application in construct() method of WorkerThread when an event fire to start XXXServer then all threads are activate and GUI work smoothlly wihout freeze. have a look.
/** * Action Event * * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent) */
public void actionPerformed(ActionEvent ae) {
log.info("actionPerformed begin..." + ae.getActionCommand());
}