Javascript 使用node js和react js时出现文件加载问题
我使用NodeJS创建了一个web服务。使用此服务,我希望从react用户界面选择用户信息和照片,并将其保存到mongodb。但是照片的名称保存在Mongodb中,但是照片没有保存在目录Javascript 使用node js和react js时出现文件加载问题,javascript,node.js,reactjs,mongodb,Javascript,Node.js,Reactjs,Mongodb,我使用NodeJS创建了一个web服务。使用此服务,我希望从react用户界面选择用户信息和照片,并将其保存到mongodb。但是照片的名称保存在Mongodb中,但是照片没有保存在目录/public/uploads/下,我应该如何修复此错误?Node js和react刚刚开始学习。 我与你分享我在下面写的代码 型号 const mongoose = require('mongoose'); const Schema = mongoose.Schema; newSchema = new Sch
/public/uploads/
下,我应该如何修复此错误?Node js和react刚刚开始学习。
我与你分享我在下面写的代码
型号
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
newSchema = new Schema({
name : String,
email : String,
password : String,
img: String
})
module.exports = mongoose.model('User', newSchema)
路线
const express = require('express')
const User = require('../models/index')
const router = express.Router()
const multer = require('multer')
var imgStorage = multer.diskStorage({
destination: './public/uploads/',
filename:(req, file, cb)=>{
cb(null, file.fieldname+"_"+Date.now()+path.extname(file.originalname))
}
})
var upload = multer({
storage: imgStorage
}).single('file')
/* create new*/
router.post('/', upload, (req,res)=>{
user = new User({
name:req.body.name,
email:req.body.email,
password:req.body.password,
img: req.body.img
})
user.save(()=>{
res.json(user)
})
})
/* find all users */
router.get('/', (req, res) => {
User.find({},(err,data) =>{
res.json(data)
})
})
/* find user by id */
router.get('/:id',(req, res) =>{
User.findById(req.params.id, (err, data) =>{
res.json(data)
})
})
/* delete user by id */
router.delete('/:id',async (req, res) =>{
await User.findByIdAndDelete(req.params.id)
res.json({'message':'deleted'})
})
/* update */
router.put('/:id', async (req, res)=>{
await User.findByIdAndUpdate(req.params.is, req.body)
res.json({'message':'updated'})
})
module.exports = router
索引
const express = require('express');
const mongoose = require('mongoose');
const mongodb = require('mongodb');
const cors = require('cors');
mongoose.connect('mongodb://localhost:27017/admin?authSource=$[authSource] --username $[username]', {useNewUrlParser : true});
const app = express();
app.use(express.json())
app.use(cors())
app.use(express.urlencoded({extended:true}))
app.use('/api',require('./routes/index'))
const port = process.env.PORT || 8080
app.listen(port)
module.exports = new mongoose.model('User', newSchema)
反应侧
import React, {Component} from 'react';
import axios from 'axios';
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
users: [],
id: 0,
name: '',
email: '',
password: '',
img: ''
}
}
componentDidMount() {
try {
axios.get('http://localhost:8080/api')
.then((res) => {
this.setState({
users: res.data,
id: 0,
name: '',
email: '',
password: '',
img: ''
})
})
} catch (e) {
console.log(e)
}
}
nameChange = event => {
this.setState({
name: event.target.value
})
}
emailChange = event => {
this.setState({
email: event.target.value
})
}
passwordChange = event => {
this.setState({
password: event.target.value
})
}
fileSelectedHandler = event =>{
this.setState({
img : event.target.files[0]
})
}
submit(event, id) {
event.preventDefault()
if (id === 0) {
// const fd = new FormData();
// fd.append('image', this.state.img, this.state.img.name);
axios.post('http://localhost:8080/api', {
name: this.state.name,
email: this.state.email,
password: this.state.password,
//img: this.state.img
img : this.state.img.name
}).then(()=>{
this.componentDidMount()
})
} else {
axios.put('http://localhost:8080/api/'+id, {
name: this.state.name,
email: this.state.email,
password: this.state.password,
img: this.state.img
}).then(()=>{
this.componentDidMount()
})
}
}
deleteUser(id) {
try {
axios.delete('http://localhost:8080/api/' + id)
.then((res) => {
this.componentDidMount()
})
console.log('Deleted successfully.')
} catch (e) {
console.log(e)
}
}
editUser(id) {
try {
axios.get('http://localhost:8080/api/' + id)
.then((res) => {
console.log(res.data)
this.setState({
id:res.data._id,
name: res.data.name,
email: res.data.email,
password: res.data.password
})
})
} catch (e) {
console.log(e)
}
}
render() {
return (
<div className="row">
<div className="col s6">
<form onSubmit={(e) => this.submit(e, this.state.id)}>
<div className="input-field col s12">
<i className="material-icons prefix">person</i>
<input value={this.state.name} onChange={(e) => this.nameChange(e)} type="text" id="autocomplete-input"
className="autocomplete" required/>
<label htmlFor="autocomplete-input">Name</label>
</div>
<div className="input-field col s12">
<i className="material-icons prefix">mail</i>
<input value={this.state.email} onChange={(e) => this.emailChange(e)} type="email" id="autocomplete-input"
className="autocomplete" required/>
<label htmlFor="autocomplete-input">Email</label>
</div>
<div className="input-field col s12">
<i className="material-icons prefix">vpn_key</i>
<input value={this.state.password} onChange={(e) => this.passwordChange(e)} type="password" id="autocomplete-input"
className="autocomplete" required/>
<label htmlFor="autocomplete-input">Password</label>
</div>
<div className="input-field col s12">
<input type="file" name="file" onChange={(e) => this.fileSelectedHandler(e)}/>
</div>
<br/>
<button className="btn waves-effect waves-light right blue" type="submit" name="action">Submit
<i className="material-icons right">send</i>
</button>
</form>
</div>
<div className="col s6">
<table>
<thead>
<tr>
<th>Name</th>
<th>Email</th>
<th>Password</th>
<th>IMG</th>
<th>Edit</th>
<th>Delete</th>
</tr>
</thead>
<tbody>
{this.state.users.map(user =>
<tr key={user._id}>
<td>{user.name}</td>
<td>{user.email}</td>
<td>{user.password}</td>
<td>
<img src="./public/uploads/user.img.name" width="80"/>
</td>
<td>
<button onClick={(e) => this.editUser(user._id)}
className="btn waves-effect waves-light green" type="submit" name="action">
<i className="material-icons right">edit</i>
</button>
</td>
<td>
<button onClick={(e) => this.deleteUser(user._id)}
className="btn waves-effect waves-light red" type="submit" name="action">
<i className="material-icons right">delete</i>
</button>
</td>
</tr>
)}
</tbody>
</table>
</div>
</div>
);
}
}
export default App;
import React,{Component}来自'React';
从“axios”导入axios;
类应用程序扩展了React.Component{
建造师(道具){
超级(道具);
此.state={
用户:[],
id:0,
名称:“”,
电子邮件:“”,
密码:“”,
img:'
}
}
componentDidMount(){
试一试{
axios.get()http://localhost:8080/api')
。然后((res)=>{
这是我的国家({
用户:res.data,
id:0,
名称:“”,
电子邮件:“”,
密码:“”,
img:'
})
})
}捕获(e){
控制台日志(e)
}
}
名称更改=事件=>{
这是我的国家({
名称:event.target.value
})
}
emailChange=事件=>{
这是我的国家({
电子邮件:event.target.value
})
}
passwordChange=event=>{
这是我的国家({
密码:event.target.value
})
}
fileSelectedHandler=event=>{
这是我的国家({
img:event.target.files[0]
})
}
提交(事件,id){
event.preventDefault()
如果(id==0){
//const fd=new FormData();
//fd.append('image',this.state.img,this.state.img.name);
轴心柱http://localhost:8080/api', {
名称:this.state.name,
电子邮件:this.state.email,
密码:this.state.password,
//img:this.state.img
img:this.state.img.name
}).然后(()=>{
this.componentDidMount()
})
}否则{
轴心http://localhost:8080/api/“+id{
名称:this.state.name,
电子邮件:this.state.email,
密码:this.state.password,
img:this.state.img
}).然后(()=>{
this.componentDidMount()
})
}
}
删除用户(id){
试一试{
axios.delete('http://localhost:8080/api/“+id)
。然后((res)=>{
this.componentDidMount()
})
console.log('已成功删除')
}捕获(e){
控制台日志(e)
}
}
编辑用户(id){
试一试{
axios.get()http://localhost:8080/api/“+id)
。然后((res)=>{
console.log(res.data)
这是我的国家({
id:res.data.\u id,
名称:res.data.name,
电子邮件:res.data.email,
密码:res.data.password
})
})
}捕获(e){
控制台日志(e)
}
}
render(){
返回(
this.submit(e,this.state.id)}>
人
this.nameChange(e)}type=“text”id=“自动完成输入”
className=“自动完成”必填项/>
名称
邮件
this.emailChange(e)}type=“email”id=“自动完成输入”
className=“自动完成”必填项/>
电子邮件
vpn_密钥
this.passwordChange(e)}type=“password”id=“自动完成输入”
className=“自动完成”必填项/>
密码
this.fileSelectedHandler(e)}/>
提交
发送
名称
电子邮件
密码
IMG
编辑
删除
{this.state.users.map(user=>
{user.name}
{user.email}
{user.password}
this.editUser(user.\u id)}
className=“btn波浪效果波浪浅绿色”type=“提交”name=“操作”>
编辑
this.deleteUser(user.\u id)}
className=“btn波浪效果波浪浅红色”type=“提交”name=“操作”>
You have to send file inside formData to the server like
inside submit function. Then send fd to server
const formData = new FormData();
formData.append('image', this.state.img);
formData.append('name', this.state.name);
formData.append('password', this.state.password);
formData.append('password', this.state.email);
axios.post('/yourEndpoint', formData).then(res => {
//Now do what you want with the response;
})
var multer = require('multer');
var path = require('path')
var storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, 'public/uploads')
},
filename: function (req, file, cb) {
cb(null, Date.now() + path.extname(file.originalname)) //Appending extension
}})
var upload = multer({ storage: storage });
router.post('/', upload.single('image'), (req,res)=>{
if (req.file.filename) {
req.body.image = req.file.filename;
}
user = new User({
name:req.body.name,
email:req.body.email,
password:req.body.password,
img: req.body.image
})
})