上传应用文件

开发者可以使用上传下载模块（ohos.request）的上传接口将本地文件上传。文件上传过程通过系统服务代理完成。在api12中，request.agent.create接口增加了设置代理地址的参数，支持设置自定义代理地址。

说明：

· 当前上传应用文件功能。request.uploadFile方式仅支持上传应用缓存文件路径（cacheDir）下的文件，request.agent方式支持上传用户公共文件和应用缓存文件路径下的文件。

· 使用上传下载模块，需声明权限：ohos.permission.INTERNET。

· 上传下载模块不支持Charles、Fiddler等代理抓包工具。

· 上传下载模块接口目前暂不支持子线程调用场景，如TaskPool等。

以下示例代码展示了两种将缓存文件上传至服务器的方法：

// 方式一:request.uploadFile
// pages/xxx.ets
import { common } from '@kit.AbilityKit';
import fs from '@ohos.file.fs';
import { BusinessError, request } from '@kit.BasicServicesKit';
@Entry
@Component
struct Index {
  build() {
    Row() {
      Column() {
        Button("上传").onClick(() => {
          // 获取应用文件路径
          // 请在组件内获取context，确保this.getUIContext().getHostContext()返回结果为UIAbilityContext
          let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
          let cacheDir = context.cacheDir;
          // 新建一个本地应用文件
          try {
            let file = fs.openSync(cacheDir + '/test.txt', fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
            fs.writeSync(file.fd, 'upload file test');
            fs.closeSync(file);
          } catch (error) {
            let err: BusinessError = error as BusinessError;
            console.error(`Invoke uploadFile failed, code is ${err.code}, message is ${err.message}`);
          }
          // 上传任务配置项
          let files: Array<request.File> = [
          //uri前缀internal://cache 对应cacheDir目录
            { filename: 'test.txt', name: 'test', uri: 'internal://cache/test.txt', type: 'txt' }
          ]
          let data: Array<request.RequestData> = [{ name: 'name', value: 'value' }];
          let uploadConfig: request.UploadConfig = {
            url: 'https://xxx',
            header: {
              'key1':'value1',
              'key2':'value2'
            },
            method: 'POST',
            files: files,
            data: data
          }
          // 将本地应用文件上传至网络服务器
          try {
            request.uploadFile(context, uploadConfig)
              .then((uploadTask: request.UploadTask) => {
                uploadTask.on('complete', (taskStates: Array<request.TaskState>) => {
                  for (let i = 0; i < taskStates.length; i++) {
                    console.info(`upload complete taskState: ${JSON.stringify(taskStates[i])}`);
                  }
                });
              })
              .catch((err: BusinessError) => {
                console.error(`Invoke uploadFile failed, code is ${err.code}, message is ${err.message}`);
              })
          } catch (error) {
            let err: BusinessError = error as BusinessError;
            console.error(`Invoke uploadFile failed, code is ${err.code}, message is ${err.message}`);
          }
        })
      }
    }
  }
}

// 方式二:request.agent
// pages/xxx.ets
import { common } from '@kit.AbilityKit';
import fs from '@ohos.file.fs';
import { BusinessError, request } from '@kit.BasicServicesKit';
@Entry
@Component
struct Index {
  build() {
    Row() {
      Column() {
        Button("上传").onClick(() => {
          // 获取应用文件路径
          // 请在组件内获取context，确保this.getUIContext().getHostContext()返回结果为UIAbilityContext
          let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
          let cacheDir = context.cacheDir;
          // 新建一个本地应用文件
          let file = fs.openSync(cacheDir + '/test.txt', fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
          fs.writeSync(file.fd, 'upload file test');
          fs.closeSync(file);
          let attachments: Array<request.agent.FormItem> = [{
            name: "test",
            value: [
              {
                filename: "test.txt",
                path: cacheDir + '/test.txt',
              },
            ]
          }];
          let config: request.agent.Config = {
            action: request.agent.Action.UPLOAD,
            url: 'http://xxx',
            mode: request.agent.Mode.FOREGROUND,
            overwrite: true,
            method: "POST",
            headers: {
              'key1':'value1',
              'key2':'value2'
            },
            data: attachments
          };
          request.agent.create(context, config).then((task: request.agent.Task) => {
            task.start((err: BusinessError) => {
              if (err) {
                console.error(`Failed to start the upload task, Code: ${err.code}  message: ${err.message}`);
                return;
              }
            });
            task.on('progress', async(progress) => {
              console.warn(`/Request upload status ${progress.state}, uploaded ${progress.processed}`);
            })
            task.on('completed', async() => {
              console.warn(`/Request upload completed`);
              //该方法需用户管理任务生命周期，任务结束后调用remove释放task对象
              request.agent.remove(task.tid);
            })
          }).catch((err: BusinessError) => {
            console.error(`Failed to create a upload task, Code: ${err.code}, message: ${err.message}`);
          });
        })
      }
    }
  }
}