#鸿蒙通关秘籍#如何实现HarmonyOS Next中Token的持久化存储与读取？

Token的持久化可以通过HarmonyOS提供的Preferences来实现。建议在EntryAbility的onCreate生命周期函数中定义一个全局方法来获取Preferences实例，以便在应用的其他部分可以方便读取和保存Token。

import dataPreferences from '@ohos.data.preferences';

onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
  globalThis.getPreferences = () => {
    let preferences: Promise<dataPreferences.Preferences> = dataPreferences.getPreferences(this.context, "appStore");
    return preferences;
  }
}

//utils/index.ets 中定义getToken和setToken方法
import dataPreferences from '@ohos.data.preferences';

export const getToken: Function = async () => {
  try {
    let preferences: dataPreferences.Preferences = await globalThis.getPreferences();
    return preferences.getSync('token', '');
  }
  catch (e) {
  }
  return '';
}

export const setToken: Function = async (value: string) => {
  try {
    let preferences: dataPreferences.Preferences = await globalThis.getPreferences();
    preferences.putSync('token', encodeURIComponent(value));
    await preferences.flush();
  } catch (e) {
    console.log(JSON.stringify(e), 'e');
  }
}