求助， flutter 上传文件，搞了一天没解决

问题是：flutter 客户端上传的文件后台取不到，但是用 postman 提交没有问题。。。 这个问题搞了一天了，请会 flutter 的帮忙看看

这是 flutter 上传文件的代码

try { SharedPreferences sp = await SharedPreferences.getInstance(); File file = await ImagePicker.pickImage(source: source); Directory temp = await getTemporaryDirectory(); File upload = await compressImage(file, temp); if (file == null) return null; print('$baseUrl/api/v1/upload?type=$type'); http.MultipartRequest request = http.MultipartRequest( 'POST', Uri.parse('$baseUrl/api/v1/upload?type=$type')); request.files.add(await http.MultipartFile.fromPath( 'image', upload.path, )); request.headers.addAll({ 'Authorization': 'Bearer ${sp.getString('token')}', }); print(sp.getString('token')); var respOnse= await request.send(); print(response.statusCode); if (response.statusCode == 200) { print(String.fromCharCodes(await response.stream.toBytes())); Map result = json.decode(String.fromCharCodes(await response.stream.toBytes())); if (result['success']) { return result['data']['image_src']; } else { showToastMessage(result['message']); } } else { print(response.statusCode); throw '出错了'; } } catch (e) { print(e); } 

后台是用的 eggjs

这是 controler 代码

"use strict"; const COntroller= require("egg").Controller; class ImageController extends Controller { async upload() { const ctx = this.ctx; const type = ctx.query.type; const userId = ctx.auth.userId; const images = ctx.request.files; const result = await ctx.service.api.v1.image.upload(type, userId, images); ctx.body = result; } } module.exports = ImageController; 

这是 service 代码

"use strict"; const pump = require("pump"); const fs = require("fs"); const path = require("path"); const Service = require("egg").Service; class ImageService extends Service { async upload(type, userId, images) { const ctx = this.ctx; try { const date = new Date(); const secOndaryDir= type === "post" ? `${date.getFullYear()}${date.getMonth() + 1}${date.getDate()}` : "avatars"; const baseDir = `/srv/www/static/upload/images/${ this.app.config.env === "test" || this.app.config.env === "local" ? "test" : "prod" }`; const targetDir = `${baseDir}/${secondaryDir}`; if (!fs.existsSync(targetDir)) { fs.mkdirSync(targetDir); } for (const image of images) { const imagename = `${userId}-${new Date().getTime()}${path .extname(image.filename) .toLowerCase()}`; const targetPath = path.join(baseDir, secondaryDir, imagename); const source = fs.createReadStream(image.filepath); const target = fs.createWriteStream(targetPath); await pump(source, target); const image_record = await ctx.model.Upload.create({ uploader_id: userId, file_url: targetPath, created_at: Date.now() }); return { success: true, data: { image_src: `${image_record.dataValues.id}` } }; } } catch (e) { console.log(e); return { success: false, message: "服务器异常" }; } finally { // delete those request tmp files await ctx.cleanupRequestFiles(); } } } module.exports = ImageService;