在ReactJS上使用Multer从MongoDB显示图像的问题

时间:2019-04-06 05:03:07

标签: node.js reactjs mongodb express multer-gridfs-storage

基本上可以概括我的问题:我有一些要显示的图像,它显示在状态为200的localhost:5000上,我的Express服务器正在运行,当它涉及localhost:3000时,即我的React Development Server,我发出了一个请求使用Axios,它确实给我带来了混乱,我根本不知道如何处理它。

反应代码:

componentDidMount() {
    axios.get('/filesuploaded/video_______82395d6a5af4e98fb8efca56f0ae3c1b_____.jpeg')
         .then(Response => console.log(Response))
         .catch(err => console.log(err));
  }

快递代码:

route.get('/:filename' , (req , res) => {
    GridFS.files.findOne({filename: req.params.filename} , (err , file) => {
        const readstream = GridFS.createReadStream(file.filename);
        readstream.pipe(res);
    })
});

乱码乱码

{data: "����..."

1 个答案:

答案 0 :(得分:0)

解决方案: 因此,我更多地使用了代码,而我忘记了它存在于客户端的package.json中,并且我已充分利用了它,并重写了服务器端代码,而没有在任何地方使用multer。

Package.json:

"proxy": "http://localhost:5000" //This helps React communicate with ExpressJS through ports.

服务器端配置:

const route           = require('express').Router();
const mongoose        = require('mongoose');
const GridFS          = require('gridfs-stream');

//Route for getting files
route.get('/file/:id' , (req , res) => {

  //Setting Up GridFS-Stream
  const db          = mongoose.connection.db;
  const MongoDriver = mongoose.mongo;
  const gfs         = new GridFS(db , MongoDriver);

  const readstream = gfs.createReadStream({
    _id: req.params.id,
  });

   //Reading to Response
   readstream.pipe(res);
});

module.exports = route;

前端配置:


import React, { Component } from 'react'

export default class Files extends Component {

//Render Method
  render() {
    return (
      <div>
        <img src = {window.location.pathname} alt = "something" />
      </div>
    )
  }
}

此处 window.location.pathname 将转换为 / file /:id 并向ExpressJS发送 GET 请求,从而加载图片!