HarmonyOS webview如何加载沙箱html

import web_webview from '@ohos.web.webview' 
import mediaquery from '@ohos.mediaquery'; 
import window from '@ohos.window'; 
import common from '@ohos.app.ability.common'; 
import { BusinessError } from '@ohos.base'; 
import inputMethod from '@ohos.inputMethod'; 
let context = getContext(this) as common.UIAbilityContext; 
let filesDir = context.filesDir 
let inputMethodController = inputMethod.getController(); 
@Entry 
@Component 
struct WebComponent { 
  controller: web_webview.WebviewController = new web_webview.WebviewController() 
  @State portraitFunc:mediaquery.MediaQueryResult|void|null = null; 
  controller1: TextInputController = new TextInputController() 
  @State text: string = '' 
 
  handler: FullScreenExitHandler | null = null 
  // 当设备横屏时条件成立 
  listener:mediaquery.MediaQueryListener = mediaquery.matchMediaSync('(orientation: landscape)'); 
  onPortrait(mediaQueryResult:mediaquery.MediaQueryResult) { 
  } 
  onPageShow(){ 
    //输入框显示的时候，通过focusControl.requestFocus 主动让焦点转移至参数指定的组件上。 
    focusControl.requestFocus('aaa'); 
  } 
  aboutToAppear() { 
    web_webview.WebviewController.setWebDebuggingAccess(true); 
    this.listener.on('change', (mediaQueryResult:mediaquery.MediaQueryResult) => { this.onPortrait(mediaQueryResult) }); 
    try { 
      let textConfig: inputMethod.TextConfig = { 
        inputAttribute: { 
          textInputType: 0, 
          enterKeyType: 1 
        } 
      }; 
      inputMethodController.attach(true, textConfig, (err: BusinessError) => { 
        if (err) { 
          console.error(`Failed to attach: ${JSON.stringify(err)}`); 
          return; 
        } 
        console.log('Succeeded in attaching the inputMethod.'); 
      }); 
    } catch(err) { 
      console.error(`Failed to attach: ${JSON.stringify(err)}`); 
    } 
 
  } 
  // 改变设备横竖屏状态函数 
  private changeOrientation(isLandscape: boolean) { 
    // 获取UIAbility实例的上下文信息 
    let context:common.UIAbilityContext = getContext(this) as common.UIAbilityContext; 
    // 调用该接口手动改变设备横竖屏状态 
    window.getLastWindow(context).then((lastWindow) => { 
      lastWindow.setPreferredOrientation(isLandscape ? window.Orientation.LANDSCAPE : window.Orientation.PORTRAIT) 
    }); 
  } 
  build() { 
    Column() { 
      Row().height(50) 
      Button('1') 
        .onClick(()=>{ 
          this.changeOrientation(true); 
        }) 
      Button('2').onClick(()=>{ 
        this.changeOrientation(false); 
      }) 
      // Button('刷新').onClick(()=>{ 
      //  // this.controller.refresh() 
      //   inputMethodController.showTextInput((err: BusinessError) => { 
      //     if (err) { 
      //       console.error(`Failed to showTextInput: ${JSON.stringify(err)}`); 
      //       return; 
      //     } 
      //     console.log('Succeeded in showing the inputMethod.'); 
      //   }); 
      // }) 
      //TextInput({ text: this.text, placeholder: 'input your word...', controller: this.controller1 }).defaultFocus(true) 
      Web({ 
        //src: '', 
        src: 'file://'+filesDir+'/example.html', 
        controller: this.controller}) 
        //.defaultFocus(true) 
        .onInterceptRequest((event)=>{ 
          if (event){ 
            console.log('url为: '+event.request.getRequestUrl()) 
          } 
          return null 
        }) 
        .key('aaa') 
          //.defaultFocus(true) 
        .onControllerAttached(()=>{ }) 
        .onPageVisible(()=>{ 
          inputMethodController.showTextInput().then(() => { 
            console.log('Succeeded in showing text input.'); 
          }).catch((err: BusinessError) => { 
            console.error(`Failed to showTextInput: ${JSON.stringify(err)}`); 
          }); 
        }) 
        .mixedMode(MixedMode.All) 
        .javaScriptAccess(true) 
        .domStorageAccess(true) 
 
      // .backgroundColor(Color.Blue) 
      //.height('100%') 
    } 
  } 
}

let context = getContext(this) as common.UIAbilityContext; 
let filesDir = context.filesDir 
Web({ 
 
  src: 'file://'+filesDir+'/example.html',