HarmonyOS 读取本地json文件转成字符串

需要把json文件存放在rawfile中，然后再ets中编写demo，如下：（仅供参考）

import { BusinessError } from '@ohos.base';

import { Context } from '@ohos.abilityAccessCtrl';
import buffer from '@ohos.buffer';
@Entry
@Component
struct Index2 {
  @State message: string = 'Hello World';
  private context: Context = getContext(this);
  aboutToAppear(): void {
    try {
      this.context.resourceManager.getRawFileContent("city.json", (error: BusinessError, value: Uint8Array) => {
        if (error != null) {
          console.error("error is ===" + error);
        } else {
          let rawFile = value;
          let str : String = buffer.from(value.buffer).toString();
          console.info(json string is ===-> ${str})
        }
      });
    } catch (error) {
      let code = (error as BusinessError).code;
      let message = (error as BusinessError).message;
      console.error(callback getRawFileContent failed, error code:==== ${code}, message: ${message}.);
    }
  }
  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
      }
      .width('100%')
    }
    .height('100%')
  }
}
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