HarmonyOS 有读取项目配置文件的案例么？

async aboutToAppear() { 
  let json = await readWriteFileWithStream() 
  let list = JSON.parse(JSON.stringify(json)) as ConfigFile 
} 
 
async function readWriteFileWithStream(): Promise<ConfigFile> { 
  return new Promise((resolve:Function,reject: Function)=>{ 
    let file = fs.openSync('文件路径', fs.OpenMode.READ_WRITE); 
    let arrayBuffer = new ArrayBuffer(4096); 
    fs.read(file.fd, arrayBuffer).then((readLen: number) => { 
      console.info("read file data succeed"); 
      let buf = buffer.from(arrayBuffer, 0, readLen); 
      let json : ConfigFile = JSON.parse(buf.toString()) 
      resolve(json) 
    }).catch((err: BusinessError) => { 
      console.error("read file data failed with error message: " + err.message + ", error code: " + err.code); 
    }).finally(() => { 
      fs.closeSync(file); 
    }); 
  }) 
}