【HarmonyOS】【ARKUI】ets怎么实现文件操作

 ets怎么实现文件操作？

关于文件操作的我们可以学习HarmonyOS文件管理和Ability上下文 这两篇文档，我这边实现”文件路径读取”、“文件写入”“文件读取”，“运行效果”四个方面实现，具体操作如下

1.       文件路径读取

参考context.getFilesDir来进行获取文件路径，代码如下

private getCacheDir(){    var context = ability_featureAbility.getContext();    context.getFilesDir()      .then((data) => { console.log('File directory obtained. Data:' + data); this.path=data;      }).catch((error) => {      console.error('Failed to obtain the file directory. Cause: ' + error.message);    })  }

2. 文件写入

参考fileio.openSync的api，实现代码如下

  private writeFiles(){    let fd = fileio.openSync(this.path+"/111.txt", 0o102, 0o666);    fileio.write(fd, "你好 2022", function (err, bytesWritten) {      if (!err) { console.log("写入成功")      }    });   }

3.       文件读取

参考 fileio.read这个api ，代码如下

private ReadFile(){    let Filepath = this.path+"/111.txt";    let fd = fileio.openSync(Filepath, 0o2);    let buf = new ArrayBuffer(4096);    fileio.read(fd, buf, function (err, readOut) {      if (!err) { let  encodedString = String.fromCodePoint.apply(null, new Uint8Array(readOut.buffer)); let decodedString = decodeURIComponent(escape(encodedString));//没有这一步中文会乱码 console.log("读取文件内容"+decodedString);      }    });  }

4.       运行效果

全部代码如下

import fileio from '@ohos.fileio';import ability_featureAbility from '@ohos.ability.featureAbility';@Entry@Componentstruct NewmyFileTwo {  @State    path:string="";  private getCacheDir(){    var context = ability_featureAbility.getContext();    context.getFilesDir()      .then((data) => { console.log('File directory obtained. Data:' + data); this.path=data;      }).catch((error) => {      console.error('Failed to obtain the file directory. Cause: ' + error.message);    })  }    private writeFiles(){    let fd = fileio.openSync(this.path+"/111.txt", 0o102, 0o666);    fileio.write(fd, "你好 2022", function (err, bytesWritten) {      if (!err) { console.log("写入成功")      }    });   }  private ReadFile(){    let Filepath = this.path+"/111.txt";    let fd = fileio.openSync(Filepath, 0o2);    let buf = new ArrayBuffer(4096);    fileio.read(fd, buf, function (err, readOut) {      if (!err) { let  encodedString = String.fromCodePoint.apply(null, new Uint8Array(readOut.buffer)); let decodedString = decodeURIComponent(escape(encodedString));//没有这一步中文会乱码 console.log("读取文件内容"+decodedString);      }    });  }    private getFilesDirNew(){    var context = ability_featureAbility.getContext();    context.getFilesDir()      .then((data) => { console.log('File directory obtained. Data:' + data); this.path=data;      }).catch((error) => {      console.error('Failed to obtain the file directory. Cause: ' + error.message);    })  }   build() {    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {      Text('获取文件目录') .fontSize(50) .fontWeight(FontWeight.Bold) .onClick(this.getFilesDirNew.bind(this));Text('写文件 你好 2022 到文件中') .fontSize(50) .fontWeight(FontWeight.Bold) .backgroundColor(Color.Red) .onClick(this.writeFiles.bind(this));Text('读文件内容') .fontSize(50) .fontWeight(FontWeight.Bold) .backgroundColor(Color.White) .onClick(this.ReadFile.bind(this));    }    .width('100%')    .height('100%')  }}

效果图如下：

更多相关学习资料：
https://developer.huawei.com/consumer/cn/forum/topic/0202773634874690369?fid=0101591351254000314?ha_source=zzh