我们的应用程序使用java.util.prefs.Preferences类来存储一些用户数据字段。下面是我们的首选项类的代码片段。我们的首选项存储工作正常，但是我们注意到首选项继续大约每 30 秒左右进行一次磁盘访问。有没有办法在 Preferences 类中禁用这些后台磁盘访问？（.userRootModeFile.root 大约每 30 秒更改一次）
public class NtapPreferences {
private static Preferences prefs = Preferences.userRoot(); //.systemRoot();
/** Prepends "NTAP.<applicationName>." to 'key' for system-wide uniqueness. */
private static String getKeyForApp ( String key ) {
return "NTAP." + Application.getApplicationName() + "." + key;
}
/**
* Returns the application preference value for 'key'.<br/>
* <br/>
* If 'key' is not a defined preference, then 'def' is returned.
*/
public static String get ( String key, String def ) {
return prefs.get(getKeyForApp(key), def);
}
/** Sets the application preference value for 'key' as 'value'. */
public static void put ( String key, String value ) {
//TODO how do we want to resolve failures to put data in the preferences?
try {
prefs.put(getKeyForApp(key), value);
prefs.flush();
} catch (NullPointerException e) {
LOG.error(NtapPreferences.class, e);
} catch (IllegalArgumentException e) {
LOG.error(NtapPreferences.class, e);
} catch (IllegalStateException e) {
LOG.error(NtapPreferences.class, e);
} catch (BackingStoreException e) {
LOG.error(NtapPreferences.class, e);
}
}
/** Removes the application preference value for 'key' if one is defined. */
public static void remove ( String key ) {
prefs.remove(getKeyForApp(key));
}
}