[英]Java Swingworker one after another and update GUI
我正在使用一些多線程應用程序進行Java swing。 情況是這樣的,我需要一個接一個地執行一個線程,即我的一個輸出與第二個線程相關。 我做了以下。
// Class one
public class Samp implements Runnable{
public Samp(String name) {
this.setName = name;
}
public void run (){
// Here I have a file extraction method called
extract(this.getName);
}
// Extract Method
public Boolean extract(String filename){
// Some extraction Operation.
// I want to update the jTextField with the current filename under extraction.
}
}
// GUI類
public class Welcome extends javax.swing.JFrame {
SwingWorker<Boolean, Void>worker = new SwingWorker<Boolean, Void>() {
@Override
protected Boolean doInBackground() throws Exception {
Thread t1 = new Thread(new ZipUtility(fileName));
t1.start();
return true;
}
// Can safely update the GUI from this method.
@Override
protected void done() {
// Here when this worker is done I wanted to Run worker 2
}
};
SwingWorker<Boolean, Void>worker2 = .........
// Again when worker2 is done I wanted to run worker 3 and so on.
}
我的問題是:
1)如何以完美的順序運行所有工人。 即,當worker1完成后,再啟動worker 2,當worker2完成后,再啟動worker 3,依此類推。
2)如何使用Samp類中的值更新我的Welcome類中的文本字段。
提前致謝。
1)如何以完美的順序運行所有工人。 即,當worker1完成后,再啟動worker 2,當worker2完成后,再啟動worker 3,依此類推。
記住一點小技巧,您可以將SwingWorker
放入ExecutorService
因此,使用類似...
public static class Worker extends SwingWorker {
private int sequence;
public Worker(int sequence) {
this.sequence = sequence;
}
@Override
protected Object doInBackground() throws Exception {
System.out.println(sequence + "...");
Thread.sleep(500);
return null;
}
}
作為測試,您可以使用類似...
ExecutorService es = Executors.newFixedThreadPool(1);
for (int index = 0; index < 10; index++) {
es.submit(new Worker(index));
}
es.shutdown();
(您不需要調用shutdown
,但是經過我的測試,決不允許JVM終止;)
這將按照提交的順序運行工人。
現在,如果要將值從一個SwingWorker
饋給另一個,則可以執行以下操作:
public abstract class ChainedWorker<T, V> extends SwingWorker<T, V> {
private ChainedWorker<T, ?> next;
private T previousValue;
public ChainedWorker(ChainedWorker<T, ?> next) {
this.next = next;
}
public void setPreviousValue(T previousValue) {
this.previousValue = previousValue;
}
@Override
protected void done() {
try {
T previous = get();
if (next != null) {
next.setPreviousValue(previous);
next.execute();
}
} catch (InterruptedException | ExecutionException ex) {
ex.printStackTrace();
}
}
}
這只是一個SwingWorker
,它允許您在鏈中提供鏈接(要調用的下一個工作器),該鏈接傳遞此SwingWorker
生成的值...或類似的東西
現在,如果您真的很瘋,想扮演自己的角色,那么也許...
public class ChainedWorkerBuilder {
private List<SwingWorker> workers;
private SwingWorker current;
public ChainedWorkerBuilder() {
workers = new ArrayList<>(25);
}
public ChainedWorkerBuilder add(SwingWorker worker) {
workers.add(worker);
return this;
}
public void execute() {
if (!workers.isEmpty()) {
SwingWorker worker = workers.remove(0);
worker.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if ("state".equals(evt.getPropertyName())) {
SwingWorker source = (SwingWorker)evt.getSource();
switch (source.getState()) {
case DONE:
source.removePropertyChangeListener(this);
execute();
break;
}
}
}
});
}
}
}
2)如何使用Samp類中的值更新我的Welcome類中的文本字段。
我不認為我會直接遵循您的代碼,但是,如果您做了類似的事情……
SwingWorker<Boolean, Void>worker = new SwingWorker<Boolean, String>() {
protected Boolean doInBackground() throws Exception {
publish(fileName);
ZipUtility zu = new ZipUtility(fileName));
return zu.extract(fileName);
}
然后,在SwingWorker
的process
方法中,您將能夠安全地更新UI。
@Override
protected void process(List<String> chunks) {
// Grab the last element...
textfield.setText(chunks.get(chunks.size() - 1));
}
}
只需從worker1
的完成對worker2
調用execute()
:
final SwingWorker<Boolean, Void> worker2 = new SwingWorker<Boolean, Void>() {
...
}
final SwingWorker<Boolean, Void> worker1 = new SwingWorker<Boolean, Void>() {
@Override
protected Boolean doInBackground() throws Exception {
// Don't start a thread, do your work, otherwise the done will fire
// too early, also it's pointless to use worker and thread like that
return true;
}
// Can safely update the GUI from this method.
@Override
protected void done() {
// update some ui
// and start the second part
worker2.execute();
}
};
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