NodeJs 中 将表单数据转发到后台

在 nodeJs 服务中 读取到文件流，并且传往后台

const fs = require('fs');
const fetch = require('node-fetch');
const FormData = require('form-data');

var file = fs.createReadStream("./static/test.war");
var form = new FormData();
form.append("file",file);
fetch('http://192.168.179.131:8010/file/uploadFile', {
    method: "POST",
    body: form,
    headers: form.getHeaders()  // 这步非常重要一定要把formdata的headers放在请求体headers中我发现网上很多例子讲的都没这个headers，没有这个后台还是会报boundary的错因为boundary是在request headers中
}).then(res => res.text()).then(data =>{
   console.log(data);
});

 

nodeJs 充当中转站 转发到后台

const multipart = require('connect-multiparty');
var multipartMiddleware = multipart();
const path = require('path');

//导入功能模块
var express = require('express');
//创建服务器对象，实例，一个应用程序
var app = express();
var bodyParser = require('body-parser');
//urlencoded() 对url进行编码
//extended:true 是否对编码格式开始高级编码
app.use(bodyParser.urlencoded({extended: true}));
//express.static("www")托管静态资源，参数是静态资源的文件夹
app.use(express.static("static"));
//listen(端口号，执行方法)用来监听指定端口号
app.listen(8082, function () {
    console.log("服务器启动成功，监听端口:%d", 8082);
});
//添加一个请求方式为get的接口
//get(接口路径,执行方法(req,resp))

// 获取 头部参数
getParam = function (req, paramName) {
    return (req.body[paramName]) ? req.body[paramName] : req.query[paramName];
}

const uploadFile = require("./fileUtil");
app.post("/fileUpload.do", multipartMiddleware, function (req, resp) {
    // 获取上传到node的文件
    const {path: filePath, originalFilename} = req.files.file;
    // 得到newPath新地址用于创建读取流
    const newPath = path.join(path.dirname(filePath), originalFilename);
    uploadFile.uploadFile(filePath,newPath,resp);
});

 

fileUtil.js

const fs = require("fs");
const FormData = require('form-data');
const fetch = require('node-fetch');

var fileUtil = {
    uploadFile: (filePath,newPath,resp) => {
        fs.rename(filePath, newPath, (err) => {
            if (err) {
                console.log(err.message);
                return;
            } else {
                //创建读取流
                const file = fs.createReadStream(newPath);
                // new formdata实例
                const form = new FormData() ;
                // 把文件加入到formdata实例中
                form.append('file', file);
                fetch('http://127.0.0.1:8080/file/uploadFile', {
                    method: "POST",
                    body: form,
                    // 这步非常重要一定要把formdata的headers放在请求体headers中,没有这个后台还是会报boundary的错因为boundary是在request headers中
                    headers: form.getHeaders()
                }).then(res => res.json()).then(data => {
                    console.log(data);
                    resp.send(data);
                });
            }
        });
    },

}
module.exports = fileUtil;