在CentOS系统中，Flutter应用程序可以使用多种数据存储方法。以下是一些常见的数据存储选项：

SharedPreferences:

适用于存储简单的键值对数据。可以使用flutter_shared_preferences插件来实现。示例代码：

import 'package:flutter/material.dart';import 'package:flutter_shared_preferences/flutter_shared_preferences.dart';Future<void> saveData(String key, String value) async {final prefs = await SharedPreferences.getInstance();await prefs.setString(key, value);}Future<String?> loadData(String key) async {final prefs = await SharedPreferences.getInstance();return prefs.getString(key);}

文件存储:

可以使用dart:io库来读写文件。示例代码：

import 'dart:io';import 'package:flutter/material.dart';Future<void> writeFile(String filePath, String content) async {final file = File(filePath);await file.writeAsString(content);}Future<String?> readFile(String filePath) async {final file = File(filePath);if (await file.exists()) {return await file.readAsString();}return null;}

SQLite数据库:

可以使用sqflite插件来操作SQLite数据库。示例代码：

import 'package:flutter/material.dart';import 'package:sqflite/sqflite.dart';import 'package:path/path.dart';Future<Database> openDatabase() async {String path = join(await getDatabasesPath(), 'my_database.db');return await openDatabase(path,version: 1, onCreate: (db, version) async {await db.execute('''CREATE TABLE my_table(id INTEGER PRIMARY KEY,name TEXT NOT NULL)''');});}Future<void> insertData(String name) async {final db = await openDatabase();await db.insert('my_table', {'name': name});}Future<List<Map<String, dynamic>>> queryData() async {final db = await openDatabase();return await db.query('my_table');}

Hive:

一个轻量级的键值存储库，适用于移动和桌面应用程序。需要先添加依赖并初始化Hive。示例代码：

import 'package:flutter/material.dart';import 'package:hive/hive.dart';Future<void> initHive() async {Hive.init(flutterRootPath);await Hive.openBox('myBox');}Future<void> saveData(String key, String value) async {final box = Hive.box('myBox');await box.put(key, value);}Future<String?> loadData(String key) async {final box = Hive.box('myBox');return box.get(key);}

Realm:

一个强大的移动数据库，适用于需要复杂数据结构和关系的应用。需要先添加依赖并配置Realm。示例代码：

import 'package:flutter/material.dart';import 'package:realm/realm.dart';void initRealm() {Realm.init(flutterRootPath);Realm.registerAdapter(MyModel());}class MyModel extends RealmObject {@PrimaryKeyint id;String name;}Future<void> saveData(int id, String name) async {final realm = await Realm.open();realm.write(() {final myModel = realm.createObject<MyModel>(id: id, name: name);});}Future<List<MyModel>> loadData() async {final realm = await Realm.open();return realm.where<MyModel>().findAll();}

选择合适的数据存储方法取决于你的具体需求，例如数据的复杂性、读写频率和数据量等。