Flutter如何将照片上传到REST API

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:http/http.dart' as http;

class UploadPhotoPage extends StatefulWidget {
  @override
  _UploadPhotoPageState createState() => _UploadPhotoPageState();
}

class _UploadPhotoPageState extends State<UploadPhotoPage> {
  File _image;

  Future getImage() async {
    final picker = ImagePicker();
    final pickedFile = await picker.getImage(source: ImageSource.gallery);

    setState(() {
      if (pickedFile != null) {
        _image = File(pickedFile.path);
      } else {
        print('No image selected.');
      }
    });
  }

  Future uploadImage() async {
    if (_image == null) return;

    var request = http.MultipartRequest(
      'POST',
      Uri.parse('https://example.com/upload'), // 替换为实际的REST API地址
    );

    request.files.add(
      await http.MultipartFile.fromPath(
        'image',
        _image.path,
      ),
    );

    var response = await request.send();
    if (response.statusCode == 200) {
      print('Image uploaded successfully');
    } else {
      print('Image upload failed');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Upload Photo'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            _image == null
                ? Text('No image selected.')
                : Image.file(_image),
            RaisedButton(
              onPressed: getImage,
              child: Text('Select Image'),
            ),
            RaisedButton(
              onPressed: uploadImage,
              child: Text('Upload Image'),
            ),
          ],
        ),
      ),
    );
  }
}