#鸿蒙学习大百科#应用重启后仍想获取之间的对象数据应该怎么实现？

import ohos.data.preferences.Preferences;
import ohos.data.preferences.PreferencesHelper;
import ohos.app.Context;
import org.json.JSONObject;

public class Example {
    private static final String PREF_FILE = "my_preferences";
    
    public void saveObject(Context context, MyObject obj) {
        Preferences preferences = PreferencesHelper.getPreferences(context, PREF_FILE);
        Preferences.Editor editor = preferences.edit();
        
        // Convert object to JSON string
        String jsonString = new JSONObject(obj.toMap()).toString();
        
        editor.putString("my_object_key", jsonString);
        editor.flushSync(); // Persist data synchronously
    }
    
    public MyObject loadObject(Context context) {
        Preferences preferences = PreferencesHelper.getPreferences(context, PREF_FILE);
        String jsonString = preferences.getString("my_object_key", "{}");
        
        // Convert JSON string back to object
        return MyObject.fromJson(jsonString);
    }
}

import ohos.app.Context;
import java.io.*;

public class FileStorageExample {

    public void saveObjectToFile(Context context, MyObject obj, String fileName) throws IOException {
        File file = new File(context.getFilesDir(), fileName);
        try (FileOutputStream fos = new FileOutputStream(file);
             ObjectOutputStream oos = new ObjectOutputStream(fos)) {
            oos.writeObject(obj); // Ensure MyObject implements Serializable
        }
    }

    public MyObject loadObjectFromFile(Context context, String fileName) throws IOException, ClassNotFoundException {
        File file = new File(context.getFilesDir(), fileName);
        try (FileInputStream fis = new FileInputStream(file);
             ObjectInputStream ois = new ObjectInputStream(fis)) {
            return (MyObject) ois.readObject();
        }
    }
}