下载文件打印乱码如何修改

static download2(context: Context, downloadUrl: string, name: string) { 
  let startTime = new Date().getTime(); 
 
  let filesDir = context.filesDir + '/' + name + '.' + FileUtil.getFileType(downloadUrl) 
  // 获取应用文件路径 
  // let filesDir = context.filesDir; 
  try { 
    //文件是否存在 
    fs.accessSync(filesDir) 
    fs.unlinkSync(filesDir); //删除文件 
  } catch (err) { 
  } 
  try { 
    request.downloadFile(context, { 
      url: downloadUrl, 
      filePath: filesDir 
    }).then((downloadTask: request.DownloadTask) => { 
      downloadTask.on('complete', () => { 
        console.info('download complete'); 
        let file = fs.openSync(filesDir, fs.OpenMode.READ_WRITE); 
        let myFileSize = FileUtil.myGetFileSize(filesDir, fs.OpenMode.READ_ONLY) 
        let arrayBuffer = new ArrayBuffer(myFileSize); 
        let readLen = fs.readSync(file.fd, arrayBuffer); 
        let buf = buffer.from(arrayBuffer, 0, readLen); 
        Logger.iLong(`The content of file: ${buf.toString()}`); 
        fs.closeSync(file); 
      }) 
    }).catch((err: BusinessError) => { 
      console.error(`Invoke downloadTask failed, code is ${err.code}, message is ${err.message}`); 
    }); 
  } catch (error) { 
    let err: BusinessError = error as BusinessError; 
    console.error(`Invoke downloadFile failed, code is ${err.code}, message is ${err.message}`); 
  } 
}