我是node.js和mongodb的初学者，我尝试学习文件上传教程，它展示了如何上传和下载文件。所以我试着也包括删除功能来删除文件，但它不工作…有人能告诉我如何修复它吗?谢谢你。
这是我的app.js
const express = require('express');
const bodyParser = require('body-parser');
const multer = require('multer');
const mongoose = require('mongoose');
const path = require('path');
const fs = require('fs')
const app = express();
const storage = multer.diskStorage({
destination:function(req,file,cb){
cb(null,'./public/uploads')
},
filename(req,file,cb){
cb(null,file.originalname)
}
})
const upload = multer({storage:storage});
mongoose.connect('mongodb://localhost:27017/files',{useNewUrlParser:false})
.then(()=>console.log('connect')).catch(err=>console.log(err))
const fileSchema = new mongoose.Schema({
filespath:String
})
const fileModel = mongoose.model('filesdemo',fileSchema)
app.set('view engine','ejs');
app.set("views",path.resolve(__dirname,'views'));
const filePath = path.resolve(__dirname,'public');
app.use(express.static(filePath));
app.use(bodyParser.urlencoded({extended:false}))
app.get('/',(req,res)=>{
fileModel.find((err,data)=>{
if(err){
console.log(err)
}
if(data){
console.log(data)
res.render('home',{data:data})
}
else{
res.render('home',{data:{}})
}
})
})
app.post('/',upload.single('file'),(req,res)=>{
const x= 'uploads/'+req.file.originalname;
const files = new fileModel({
filespath:x
})
files.save((err,data)=>{
if(err){
console.log(err)
}
else{
console.log('data',data)
res.redirect('/')
}
})
})
app.get('/download/:id',(req,res)=>{
fileModel.find({_id:req.params.id},(err,data)=>{
if(err){
console.log(err)
}
else{
const path= __dirname+'/public/'+data[0].filespath;
res.download(path);
}
})
})
app.get('/delete/:id', (req, res) => {
fileModel.find({_id: req.params.id}, (err, data) => {
if(err) {
console.log(err);
res.send(err);
} else {
const path= __dirname+'/public/'+data[0].filespath;
fs.unlink(path, (err) => {
if (err) throw err;
console.log(path + ' was deleted');
});
fileModel.deleteOne({ _id: req.params.id }, (err) => {
if (err) {
console.log(err);
res.send(err);
} else {
console.log('File deleted successfully');
res.send('File deleted successfully');
}
});
}
});
});
const port = process.env.PORT || 3000 ;
app.listen(port,()=>console.log(`server running at ${port}`))
module.exports = app;
这是我的家
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<center>
<h2>Upload Files</h2>
<form action="/" method="POST" enctype="multipart/form-data">
<input type="file" name="file"><br>
<input type="submit" value="Upload">
</form><br><br><br><br>
</center>
<h2>Download Files</h2>
<table>
<thead>
<tr>
<td>
image
</td>
<td>
download
</td>
</tr>
</thead>
<tbody>
<% for(var i=0; i < data.length > 0; i++) {%>
<tr>
<td><img src="<%= data[i].filespath %>" style="width:100px; height:100px;"></td>
<td>
<form action="/download/<%= data[i]._id %>" method="GET">
<input type="submit" value="Download">
</form>
<form action="/delete/<%= data[i]._id %>" method="GET">
<input type="submit" value="Delete">
</form>
</td>
</tr>
<% } %>
</tbody>
</table>
</body>
</html>
我使用"body-parser": "^1.20.1", "ejs": "^3.1.8", "express": "^4.18.2", "mongoose": "^6.8.1", "multer": "^1.4.5-lts.1"
解决删除文件不工作，我希望有人能告诉我我做错了什么。
添加const fs = require('fs')并将/delete端点更改为:
app.delete('/delete/:id', (req, res) => {
fileModel.find({_id: req.params.id}, (err, data) => {
if(err) {
console.log(err);
res.send(err);
} else {
const path= __dirname+'/public/'+data[0].filespath;
fs.unlink(path, (err) => {
if (err) throw err;
console.log(path + ' was deleted');
});
fileModel.deleteOne({ _id: req.params.id }, (err) => {
if (err) {
console.log(err);
res.send(err);
} else {
console.log('File deleted successfully');
res.send('File deleted successfully');
}
});
}
});
});