我將使用的方法是在WatchDir中提供用于注冊回調的方法.最簡單的方法是對回調使用

Consumer屬性：

public class WatchDir {

private Consumer onCreate ;

public void setOnCreate(Consumer onCreate) {

this.onCreate = onCreate ;

}

// other callbacks as needed...

// ...

void processEvents() {

// ...

Path child = ... ; // file/folder that was created

if (! recursive && kind == ENTRY_CREATE) {

if (onCreate != null) {

onCreate.accept(child);

}

}

// ...

}

// ...

}

請注意,WatchDir.processEvents()是(非終止)阻塞調用,因此您需要在后臺線程中運行它.因此,您可以從控制器中執(zhí)行以下操作：

WatchDir watchDir = new WatchDir(rootPath, false) ;

watchDir.setOnCreate(path ->

Platform.runLater(() -> listView.getItems().add(path)));

Thread watchThread = new Thread(watchDir::processEvents);

watchThread.setDaemon(true);

watchThread.start();

請注意,由于回調將在后臺線程上調用,因此對UI的更新應包裝在Platform.runLater(…)中.如果愿意,可以為WatchDir配備執(zhí)行程序來執(zhí)行回調,這使您僅需告訴一次即可始終通過Platform.runLater(…)執(zhí)行回調：

public class WatchDir {

// Executor for notifications: by default just run on the current thread

private Executor notificationExecutor = Runnable::run ;

public void setNotificationExecutor(Executor notificationExecutor) {

this.notificationExecutor = notificationExecutor ;

}

private Consumer onCreate ;

// etc...

void processEvents() {

// ...

if (! recursive && kind == ENTRY_CREATE) {

if (onCreate != null) {

notificationExecutor.execute(() -> onCreate.accept(child));

}

}

// ...

}

}

接著

WatchDir watchDir = new WatchDir(rootPath, false) ;

watchDir.setNotificationExecutor(Platform::runLater);

watchDir.setOnCreate(listView.getItems()::add); /* or path -> listView.getItems().add(path) */

Thread watchThread = new Thread(watchDir::processEvents);

watchThread.setDaemon(true);

watchThread.start();

總結

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