import ohos.app.AbilityContext;
import ohos.event.commonevent.CommonEventSupport;
import ohos.event.commonevent.CommonEventData;
import ohos.eventhandler.EventHandler;
import ohos.eventhandler.EventRunner;
import ohos.eventhandler.InnerEvent;
import ohos.hiviewdfx.HiLog;
import ohos.hiviewdfx.HiLogLabel;
import ohos.security.SystemPermission;
import ohos.system.AbilityContext;
import ohos.system.eventhandler.EventHandlerUtils;
import ohos.system.eventhandler.InnerEvent;
import java.io.File;
import java.io.IOException;
import java.nio.file.*;
import java.util.HashMap;
import java.util.Map;
/**
* 文件监视器示例
*/
public class FileWatcherExample extends AbilityContext {
private static final HiLogLabel TAG = new HiLogLabel(HiLog.LOG_APP, 0x00201, "FileWatcherExample");
private WatchService watchService;
private Map<WatchKey, Path> watchKeyPathMap;
public FileWatcherExample() {
watchKeyPathMap = new HashMap<>();
}
/**
* 初始化文件监视器
*
* @param directoryPath 要监视的目录路径
*/
public void initFileWatcher(String directoryPath) {
try {
watchService = FileSystems.getDefault().newWatchService();
Path path = Paths.get(directoryPath);
path.register(watchService, StandardWatchEventKinds.ENTRY_CREATE,
StandardWatchEventKinds.ENTRY_MODIFY, StandardWatchEventKinds.ENTRY_DELETE);
watchKeyPathMap.put(path.register(watchService, StandardWatchEventKinds.ENTRY_CREATE,
StandardWatchEventKinds.ENTRY_MODIFY, StandardWatchEventKinds.ENTRY_DELETE), path);
// 启动监视线程
startWatching();
} catch (IOException e) {
HiLog.error(TAG, "Failed to initialize file watcher: %{public}s", e.getMessage());
}
}
/**
* 启动监视线程
*/
private void startWatching() {
EventRunner eventRunner = EventRunner.create(true);
EventHandler eventHandler = EventHandlerUtils.createEventHandler(eventRunner, new EventHandler.EventRunnerPolicy(-1));
Runnable watchTask = () -> {
try {
while (true) {
WatchKey watchKey = watchService.take(); // 阻塞,等待事件
Path directory = watchKeyPathMap.get(watchKey);
if (directory != null) {
for (WatchEvent<?> event : watchKey.pollEvents()) {
Path file = directory.resolve((Path) event.context());
if (event.kind() == StandardWatchEventKinds.ENTRY_CREATE) {
HiLog.info(TAG, "File created: %{public}s", file);
// 处理文件创建事件
} else if (event.kind() == StandardWatchEventKinds.ENTRY_MODIFY) {
HiLog.info(TAG, "File modified: %{public}s", file);
// 处理文件修改事件
} else if (event.kind() == StandardWatchEventKinds.ENTRY_DELETE) {
HiLog.info(TAG, "File deleted: %{public}s", file);
// 处理文件删除事件
}
}
watchKey.reset(); // 重设WatchKey
}
}
} catch (InterruptedException e) {
HiLog.error(TAG, "File watcher thread interrupted: %{public}s", e.getMessage());
}
};
eventHandler.postTask(watchTask);
}
public static void main(String[] args) {
FileWatcherExample fileWatcherExample = new FileWatcherExample();
fileWatcherExample.initFileWatcher("/path/to/your/directory");
}
}
在这个示例中,我们创建了一个FileWatcherExample类,其中包含了初始化文件监视器的方法initFileWatcher和启动监视线程的方法startWatching。在main方法中,我们创建了一个FileWatcherExample实例,并调用initFileWatcher方法来初始化文件监视器。
请注意,这只是一个基本示例,实际使用中可能需要根据具体需求进行调整。
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