Flutter Dio:如何上传图片?

问题描述

我想使用软件包 DIO软件包将一些图像上传到rest-api，我是这个包的新手(我仅将此包用于CRUD操作)，并且在上载图像操作时遇到了问题.
我已经在阅读文档，看不到上传图片.我正在尝试此代码(参考文档)，但出现了一些错误:

I want upload some image to rest-api using Package DIO Package ,I'm new for this package (i'm use this package just for CRUD operation) and i'm got problem when upload image operation.
i'm already reading documentation and nothing see for upload images. I'm try this code(ref on documentation) and got some error :

error:FileSystemException
message :"Cannot retrieve length of file"
OSError (OS Error: No such file or directory, errno = 2)
"File: '/storage/emulated/0/Android/data/com.example.mosque/files/Pictures/scaled_IMG_20190815_183541.jpg'"
Type (FileSystemException)
message:FileSystemException: Cannot retrieve length of file, path = 'File: '/storage/emulated/0/Android/data/com.example.mosque/files/Pictures/scaled_IMG_20190815_183541.jpg'' (OS Error: No such file or directory, errno = 2)
DioErrorType (DioErrorType.DEFAULT)
name:"DioErrorType.DEFAULT"

Api.dart

Future uploadImage({dynamic data,Options options}) async{
      Response apiRespon =  await dio.post('$baseURL/mahasiswa/upload/',data: data,options: options);
      if(apiRespon.statusCode== 201){
        return apiRespon.statusCode==201;
      }else{
        print('errr');
        return null;
      }
}

View.dart

void uploadImage() async {
    FormData formData = FormData.from({
      "name_image": _txtNameImage.text,
      "image": UploadFileInfo(File("$_image"), "image.jpg")
    });
    bool upload =
        await api.uploadImage(data: formData, options: CrudComponent.options);
    upload ? print('success') : print('fail');
  }

我希望这个软件包的专家可以为我提供此代码，并建议我上传图像.
谢谢.

I hope who expert with this package can help me with this code and suggest me for upload images.
Thanks.

import 'dart:io';

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:mosque/api/api_mosque.dart';

class UploadImage extends StatefulWidget {
  @override
  _UploadImageState createState() => _UploadImageState();
}

class _UploadImageState extends State<UploadImage> {
  ApiHelper api = ApiHelper();
  File _image;
  TextEditingController _txtNameImage = TextEditingController();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: IconButton(
          icon: Icon(Icons.arrow_left),
          onPressed: () => Navigator.pop(context, false),
        ),
        actions: <Widget>[
          IconButton(
            icon: Icon(Icons.file_upload),
            onPressed: () {
              uploadImage();
            },
          )
        ],
      ),
      body: _formUpload(),
    );
  }

  Widget _formUpload() {
    return SingleChildScrollView(
      scrollDirection: Axis.vertical,
      child: Column(
        children: <Widget>[
          TextField(
            controller: _txtNameImage,
            keyboardType: TextInputType.text,
            decoration: InputDecoration(hintText: "Nama Image"),
            maxLength: 9,
            textAlign: TextAlign.center,
          ),
          SizedBox(
            height: 50.0,
          ),
          Container(
            child: _image == null
                ? Text('No Images Selected')
                : Image.file(_image),
          ),
          SizedBox(
            height: 50.0,
          ),
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              RaisedButton(
                child: Icon(Icons.camera),
                onPressed: () => getImageCamera(),
              ),
              SizedBox(
                width: 50.0,
              ),
              RaisedButton(
                child: Icon(Icons.image),
                onPressed: () => getImageGallery(),
              )
            ],
          )
        ],
      ),
    );
  }

  void uploadImage() async {
    FormData formData = FormData.from({
      "name_image": _txtNameImage.text,
      "image": UploadFileInfo(File("$_image"), "image.jpg")
    });
    bool upload =
        await api.uploadImage(data: formData, options: CrudComponent.options);
    upload ? print('success') : print('fail');
  }

  getImageGallery() async {
    var imageFile = await ImagePicker.pickImage(source: ImageSource.gallery);
    setState(() {
      _image = imageFile;
    });
  }

  getImageCamera() async {
    var imageFile = await ImagePicker.pickImage(source: ImageSource.camera);
    setState(() {
      _image = imageFile;
    });
  }
}

推荐答案

在 Dio最新版本中， UploadFileInfo 方法已由 MultipartFile 代替班级.这里是发布图像，视频或任何文件的方法:

In Dio latest version, UploadFileInfo method has been replaced by MultipartFile class. And here the way how to use to post image, video or any file:

Future<String> uploadImage(File file) async {
    String fileName = file.path.split('/').last;
    FormData formData = FormData.fromMap({
        "file":
            await MultipartFile.fromFile(file.path, filename:fileName),
    });
    response = await dio.post("/info", data: formData);
    return response.data['id'];
}

这篇关于Flutter Dio:如何上传图片?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！