【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)        .fon 天津党性培训 www.jsganxun.cn tWeight(FontWeight.Bold)        .backgroundColor(Color.White)        .onClick(this.ReadFile.bind(this));    }    .width('100%')    .height('100%')  }}

效果图如下：