HarmonyOS 鸿蒙Next关于调用filepicker组件进行文件保存问题

可以试试下面这段代码：

import common from '[@ohos](/user/ohos).app.ability.common';
import fs from '[@ohos](/user/ohos).file.fs';
import { picker } from '[@kit](/user/kit).CoreFileKit';

let context = getContext(this) as common.UIAbilityContext;

let fileNameArr = ['1.txt', '2.txt']

[@Entry](/user/Entry)
[@Component](/user/Component)
struct Page10 {
 [@State](/user/State) message: string = 'Hello World';

 build() {
   Column() {
     Button('1、WORD文件写入沙箱')//将源文件放在rawfile目录下
       .onClick(() => {
         for (let index = 0; index < fileNameArr.length; index++) {
           this.rawToFile(fileNameArr[index])
         }
       })

     Button('2、多个文件保存到手机文件管理')
       .onClick(() => {
         this.save()
       })

   }
 }

 rawToFile(fileName: string) {

   context.resourceManager.getRawFileContent(fileName, (_err, value) => {
     let myBuffer: ArrayBufferLike = value.buffer
     let filePath = context.filesDir + '/' + fileName
     console.log("rawToFile中filePath:" + filePath);

     let file = fs.openSync(filePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
     let writeLen = fs.writeSync(file.fd, myBuffer);
     console.info("写入数据和文件成功：" + writeLen);
     console.info("沙箱名称是：" + fileName);
     fs.closeSync(file);
   });
 }

 save() {
   console.log('fileNameArr:' + fileNameArr)
   const documentSaveOptions = new picker.DocumentSaveOptions(); // 创建文件管理器保存选项实例
   documentSaveOptions.newFileNames = fileNameArr; // 保存文件名（可选）

   const documentViewPicker = new picker.DocumentViewPicker;
   documentViewPicker.save(documentSaveOptions)
     .then((documentSaveResult) => {
       // 获取到到图片或者视频文件的URI后进行文件读取等操作
       console.info('documentSaveResult.save successfully, audioSaveResult uri: ' + JSON.stringify(documentSaveResult))
       let filePath = ''

       let uri = ''
       for (let index = 0; index < documentSaveResult.length; index++) {
         uri = documentSaveResult[index]
         console.log(`uri${index}:${uri}`)
         filePath = context.filesDir + '/' + fileNameArr[index]
         console.log('循环filePath：' + filePath)
         // 沙箱路径文件
         let sanFile = fs.openSync(filePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE)
         let pubFile = fs.openSync(uri, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE)
         // 将文件从沙箱路拷贝到公共路径
         fs.copyFileSync(sanFile.fd, pubFile.fd)
         fs.closeSync(sanFile)
         fs.closeSync(pubFile)
       }
     })
     .catch((err: Error) => {
       console.error(`Invoke documentPicker.select failed, message is ${err.message}`);
     })
 }
}