HarmonyOS Web组件，怎么拦截url并加载本地文件

可以参考onLoadIntercept，当Web组件加载url之前触发该回调：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ts-basic-components-web-V5#onloadintercept10

通过onInterceptRequest可以拦截到请求，再从沙箱路径替换图片的demo示例如下：

import web_webview from '@ohos.web.webview';
import fs from '@ohos.file.fs';
import common from '@ohos.app.ability.common';
import axios from '@ohos/axios'

@Entry
@Component
struct GetFile {

  @State message: string = 'Hello World';
  // 获取应用文件路径
  context = getContext(this) as common.UIAbilityContext;
  webviewController: web_webview.WebviewController = new web_webview.WebviewController();
  responseweb: WebResourceResponse = new WebResourceResponse()
  aboutToAppear() {
    // 配置Web开启调试模式
    web_webview.WebviewController.setWebDebuggingAccess(true);
  }

  hasFile(filePath:string){
    let b = fs.accessSync(filePath)
    return b
  }

  async getFile(url : string) {
    const fileName = url.split("/").pop();
    const filePath = this.context.cacheDir + '/'+fileName;

    const flag=this.hasFile(filePath);
    console.log(flag+"123456")
    if(!flag){
      await this.downloadImage(url, filePath);
    }
    let file = await fs.openSync(filePath, fs.OpenMode.READ_ONLY);
    let arrayBuffer = new ArrayBuffer(4096);
    return file.fd;
  }
  @Entry
  @Component
  struct GetFile {

  @State message: string = 'Hello World';
  // 获取应用文件路径
  context = getContext(this) as common.UIAbilityContext;
  webviewController: web_webview.WebviewController = new web_webview.WebviewController();
  responseweb: WebResourceResponse = new WebResourceResponse()
  aboutToAppear() {
    // 配置Web开启调试模式
    web_webview.WebviewController.setWebDebuggingAccess(true);
  }

  hasFile(filePath:string){
    let b = fs.accessSync(filePath)
    return b
  }
  async downloadImage(url : string,
    filePath:string) {
    try {
      await axios({
        method: "get",
        url,
        context: this.context,
        filePath: filePath });
    } catch (error) {
      console.error('[Demo] axios error');
    }
  }
  build() {
    Column() {
      Web({ src: $rawfile('catch.html'), controller: this.webviewController })
        .onInterceptRequest((event) => {
          if (event) {
          }
          const url = event!.request.getRequestUrl();
          console.log(url.endsWith(".jpg") + '123456')
          if (!url.endsWith(".jpg")) return null;
          try {
            let url2='https://xxx.jpg';
            this.getFile(url2).then(fd => {
              this.responseweb.setResponseData(fd);
              this.responseweb.setResponseCode(200);
              this.responseweb.setReasonMessage('OK');
              this.responseweb.setResponseIsReady(true);
            });
            this.responseweb.setResponseMimeType('image/*');
            this.responseweb.setResponseIsReady(false);
            console.log(this.responseweb.getResponseData().toString+"123456")
            return this.responseweb;
          } catch (error) {
            console.error(`[Demo]Code: ${error.code},Message: ${error.message} `);
            return null
          }
        })
    }
  }
}
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