在node.JS中使用POST上傳兩個文件

Question

我在Python中有以下代碼：

import requests
fileslist = [('file[]',('user_query.txt', open('user_query.txt', 'rb'), 'text/plain')),
                ('file[]',('wheatData.csv', open('wheatData.csv', 'rb'), 'text/csv')),]

r = requests.post('url',
    files=fileslist)

我正在嘗試將其轉換為node.JS版本。 到目前為止，我有這個：

var request = require('request');
var fs      = require('fs');

var req = request.post(url, function (err, resp, body) {
  if (err) {
    console.log('Error!');
  } else {
    console.log(body);
  }
});

var form = req.form();
form.append('wheatData.csv', fs.createReadStream('wheatData.csv'));
form.append('user_query.txt', fs.createReadStream('user_query.txt'));

我究竟做錯了什么？

Answer 1

這就是你使用express和body-parser模塊解析post請求並獲取你需要的文件的方法。這就是你的node.js服務器。

導入所有模塊：

var express = require("express");
var bodyParser = require('body-parser')
var app = express(); //init express app()
var util = require('util');

//APP CONFIGURATION >> Skip this if you dont want CORS
app.use(express.static('app')); // use this as resource  directory
app.use(function (req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    next();
});

配置帖子網址：

//url => url/for/mypostrequest
app.post(url, done, function (req, res) {

    //Handle the post request body here...
    var filesUploaded = 0;
    //check if files present
    if (Object.keys(req.files).length === 0) {
        console.log('no files uploaded');
    } else {
        console.log(req.files);
        var files = req.files.file1;
        //If multiple files store in array..
        if (!util.isArray(req.files.file1)) {
            files = [req.files.file1];
        }
        filesUploaded = files.length;
    }
  res.json({message: 'Finished! Uploaded ' + filesUploaded + ' files.  Route is /files1'});
});

確保所有模塊都已安裝並作為依賴項存在於package.json中

---

從節點進行api post調用的代碼..

首先在服務器中包含http模塊。

var http = require('http');
var querystring = require('querystring');
var fs = require('fs');

然后包含以下代碼以從節點服務器發出發布請求

    var file1, file2;
    //Read first File ...
    fs.readFileSync('wheatData.csv', function (err, data) {
        if (err) {
            console.log('Error in file reading...');
        }
        file1 = data;

        //Read second file....
        fs.readFileSync('wheatData.csv', function (err, data) {
            if (err) {
                console.log('Error in file reading...');
            }
            file2 = data;

            //Construct the post request data..
            var postData = querystring.stringify({
                'msg': 'Hello World!',
                'file1': file1,
                'file2': file2
            });
            var options = { //setup option for you request
                hostname: 'www.path/to/api/',
                port: 80,
                path: '/upload',
                method: 'POST',
                headers: {
                    'Content-Type': 'application/x-www-form-urlencoded',
                    'Content-Length': postData.length
                }
            };
            var req = http.request(options, function (res) {
                console.log('STATUS:' + res.statusCode);
                console.log('HEADERS:' + JSON.stringify(res.headers));
                res.setEncoding('utf8');
                res.on('data', function (chunk) {
                    console.log('BODY: ' + chunk);
                });
                res.on('end', function () {
                    console.log('No more data in response.');
                });
            });
            req.on('error', function (e) {
                console.log('problem with request: ' + e.message);
            });
            // write data to request body
            req.write(postData);
            req.end();

        });
    });

請注意，代碼尚未在實時服務器上進行測試，您可能需要根據您的配置進行更改。

你也可以使用其他的庫，例如請求或needler..etc使從節點服務器的呼叫后在建議這個職位。