如何读写各种途径创建的文件

import { BusinessError } from '@kit.BasicServicesKit'; 
import fs from '@ohos.file.fs'; 
 
@Entry 
@Component 
struct Page { 
  build() { 
    Row() { 
      Column() { 
        Text("判断文件夹是否存在") 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
          .onClick(() => { 
            let pathDir = getContext().filesDir + "/testDir1/testDir2/testDir3"; 
            fsMkdirPath(pathDir) 
          }) 
        Text("写入文件") 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
          .onClick(() => { 
            let pathDir = getContext().filesDir + "/testDir1/testDir2/testDir3/test.txt"; 
            let file = fs.openSync(pathDir, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE); 
            let str: string = "hello, world"; 
            fs.write(file.fd, str).then((writeLen: number) => { 
              console.info("testTag- write data to file succeed and size is:" + writeLen); 
            }).catch((err: BusinessError) => { 
              console.error("testTag- write data to file failed with error message: " + err.message + ", error code: " + err.code); 
            }).finally(() => { 
              fs.closeSync(file); 
            }); 
          }) 
 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
} 
 
function fsMkdirPath(filePath: string) { 
  fs.access(filePath).then((res: boolean) => { 
    if (res) { 
      console.info("testTag- file exists"); 
    } else { 
      console.info("testTag- file not exists"); 
      fs.mkdirSync(filePath, true) 
    } 
  }).catch((err: BusinessError) => { 
    console.error("access failed with error message: " + err.message + ", error code: " + err.code); 
  }); 
}
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