错误：多部分：未找到边界
我想添加一些带有角度的文本文件的文件：这是我的服务：
src/app/services/web.service.ts
import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
const httpOptions = {
headers: new HttpHeaders({
'Content-Type': 'multipart/form-data'
})
}
@Injectable({
providedIn: 'root'
})
export class WebService {
devUri:string = 'http://localhost:4000';
constructor(private http:HttpClient) { }
post(uri:string, object: Object){
console.log(object);
return this.http.post(`${this.devUri}/${uri}`, object, httpOptions);
}
}
它显示Error: Multipart: Boundary not found
在有人写之前“只需删除'Content-Type'：'multipart / form-data'它会起作用它不会！当我删除它时，我的req.files = []（这里还有一些变化等于未定义）。这是我的路线（不完整，但不需要更多）：
路线/api/messages.js
const { initStorage, initUpload } = require('../../modules/multerModule');
const conn = mongoose.connection;
Grid.mongo = mongoose.mongo;
// Init gfs
let gfs;
conn.once('open', () => {
// Init stream
gfs = Grid(conn.db);
gfs.collection(collectionName);
});
const collectionName = 'messages';
const bucketName = 'messages';
const storage = initStorage(conn, bucketName);
const upload = initUpload(storage);
router.post('/', upload.any(), (req, res) => {
console.log(req.files);
console.log(req.body);
...
}
这是我来自 multerModule 的函数（它们都适用于 react/redux、app，但不适用于 Angular）：
模块/multerModule.js：
const path = require('path');
const multer = require('multer');
const crypto = require('crypto');
const GridFsStorage = require('multer-gridfs-storage');
// Create storage engine
const initStorage = (conn, bucketName) => new GridFsStorage({
db: conn,
file: (req, file) => {
return new Promise((resolve, reject) => {
crypto.randomBytes(16, (err, buf) => {
if (err) {
return reject(err);
}
const filename = buf.toString('hex') + path.extname(file.originalname);
const fileInfo = {
filename: filename,
bucketName: bucketName
};
resolve(fileInfo);
});
});
}
});
// Create upload module
const initUpload = (storage) => multer({
storage: storage,
fileFilter: function (req, file, callback) {
const ext = path.extname(file.originalname);
if (ext !== '.png' && ext !== '.jpg' && ext !== '.gif' && ext !== '.jpeg') {
return callback(new Error('Only images are allowed'))
}
callback(null, true)
}
});
module.exports = { initStorage, initUpload };
Ofcourse 后来当我尝试使用 req.files(destructurize 或其他) 我得到错误，因为它是未定义或空数组。在 req.body 中，还显示了 messages 字段：
[Object: null prototype] {
messages: '[object File]',
content: 'dsada',
path: 'undefined',
fileImage: 'true'
}
最后两件事是 server.js 和 onSubmit 函数：
服务器.js
...
const bodyParser = require('body-parser');
// #6 Initialize an Express application
const app = express();
app.use(cors());
app.use(bodyParser.urlencoded({limit: '50mb', extended: true}));
app.use(bodyParser.json({limit: '50mb', extended: true}));
const db = process.env.mongoURI;
// Connect to Mongo
mongoose
.connect(db, {
useNewUrlParser: true,
useCreateIndex: true,
useUnifiedTopology: true,
useFindAndModify: false }) // Adding new mongo url parser
.then(() => console.log('MongoDB Connected...'))
.catch(err => console.log(err));
...
OnSubmit 函数：
src/app/components/Message/add-message/add-message.ts
onSubmit() {
if( this.fileImage){
const message = new FormData();
console.log(this.files[0]);
message.append('messages', this.files);
console.log(typeof(JSON.stringify(this.fileImage)));
message.append('content', this.content);
message.append('fileImage', JSON.stringify(this.fileImage));
this.addMessage.emit(message);
}
else{
const message = {
content: this.content,
fileImage: this.fileImage,
path: this.path
}
this.addMessage.emit(message);
}
}
经过一些尝试后，我得到另一个错误（现在我在 HttpClient 模块中不包含 httpOptions 并且附加到 FormData() 的文件数据与 react-redux/node 应用程序中的相同）：
Error: The database connection must be open to store files
at GridFSStorage._handleFile
问题是相同的代码在 redux 应用程序中可以正常工作，但不能在 angular 中正常工作。