如何使用Web组件下载pdf文件并展示给用户

"requestPermissions": [ 
  { 
    "name": "ohos.permission.INTERNET" 
  }, 
  { 
    "name": "ohos.permission.WRITE_MEDIA" 
  }, 
  { 
    "name": "ohos.permission.READ_NEDIA" 
  } 
]
import common from ‘@ohos.app.ability.common’; 
import request from ‘@ohos.request’; 
import { BusinessError } from ‘@ohos.base’; 
 
// 获取应用文件路径 
let context = getContext(this) as common.UIAbilityContext; 
let filesDir = context.filesDir; 
 
@Entry 
@Component 
export struct Index1 { 
  @State message: string = ‘Hello World’; 
 
  build() { 
    Row() { 
      Column() { 
        Text(this.message) 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
        Button(“下载”) 
        .onClick(() => { 
          try { 
            console.log(‘downloadTask1 filesDir’ + filesDir + ‘/00sg00izg2.jpg’); 
            //下载文件 
            request.downloadFile(context, { 
              url: ‘https://nimg.ws.126.net/?url=http%3A%2F%2Fdingyue.ws.126.net%2F2023%2F1108%2Fea454272j00s3rxox001tc000sg00izg.jpg&thumbnail=660x2147483647&quality=80&type=jpg’, 
              filePath: filesDir + ‘/00sg00izg2.jpg’ 
            }).then((downloadTask: request.DownloadTask) => { 
              //开启回调 
              downloadTask.on(‘complete’, () => { 
                console.info(‘downloadTask1 complete’); 
              }) 
            }).catch((err: BusinessError) => { 
              console.error(Invoke downloadTask failed, code is ${err.code}, message is ${err.message}); 
            }); 
          } catch (error) { 
            let err: BusinessError = error as BusinessError; 
            console.error(Invoke downloadTask downloadFile failed, code is ${err.code}, message is ${err.message}); 
          } 
        }) 
 
          .width(‘100%’) 
      } 
      .height(‘100%’) 
    } 
  }}