HarmonyOS鸿蒙Next中使用fileio进行文件读取写入，会出现阻塞

@ohos.fileio 模块从 API version 9 开始废弃，建议使用 @ohos.file.fs 替代。https://developer.huawei.com/consumer/cn/doc/harmonyos-references/js-apis-fileio

修改如下：

import { common } from '@kit.AbilityKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { util } from '@kit.ArkTS';
import fs from '@ohos.file.fs';

const DOMAIN: number = 0X11;
const APP_TAG: string = 'TestDemo';
const TAG: string = '=-=:--->';

@Entry
@Component
struct Index {
  @State message: string = 'Hello World';
  private url: string = '';

  aboutToAppear(): void {
    if (this.getUIContext().getHostContext()) {
      let context: common.UIAbilityContext = this.getUIContext().getHostContext() as common.UIAbilityContext;
      this.url = context.filesDir;
    }
  }

  build() {
    Column({ space: 20 }) {
      Button('Put Data')
        .onClick((event: ClickEvent) => {
          this.putData('Hello World');
        })
      Button('get Data')
        .onClick((event: ClickEvent) => {
          this.getData();
        })
    }
    .alignItems(HorizontalAlign.Center)
    .height('100%')
    .width('100%')
  }

  private async putData(data: string): Promise<void> {
    let targetUrl: string = `${this.url}/test.txt`;
    try {
      hilog.info(DOMAIN, APP_TAG, `${TAG} open file begin`);
      let file: fs.File = fs.openSync(targetUrl, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
      hilog.info(DOMAIN, APP_TAG, `${TAG} open file success`);
      hilog.info(DOMAIN, APP_TAG, `${TAG} write data to  targetfile begin`);
      fs.writeSync(file.fd, data);
      hilog.info(DOMAIN, APP_TAG, `${TAG} write data to  targetfile success`);
      fs.closeSync(file);
    } catch (e) {
      hilog.error(DOMAIN, APP_TAG, `${TAG} putData err:${JSON.stringify(e)}`);
    }
  }

  private getData(): void {
    let targetUrl: string = `${this.url}/test.txt`;
    try {
      hilog.info(DOMAIN, APP_TAG, `${TAG} open file begin`);
      let file: fs.File = fs.openSync(targetUrl, fs.OpenMode.READ_ONLY);
      hilog.info(DOMAIN, APP_TAG, `${TAG} open file success`);
      hilog.info(DOMAIN, APP_TAG, `${TAG} read data from  argetfile begin`);
      let arrayBuffer: ArrayBuffer = new ArrayBuffer(1024);
      fs.readSync(file.fd, arrayBuffer);
      hilog.info(DOMAIN, APP_TAG, `${TAG} read data to  targetfile success`);
      let decoder = util.TextDecoder.create('utf-8');
      let result: string = decoder.decodeToString(new Uint8Array(arrayBuffer));
      hilog.info(DOMAIN, APP_TAG, `${TAG} the result is:${result}`);
      fs.closeSync(file);
    } catch (e) {
      hilog.error(DOMAIN, APP_TAG, `${TAG} getData err:${JSON.stringify(e)}`);
    }
  }
}