NodeJS：-如何使用 multer 将表单中的图像存储在 mongo DB 中，并将相同的图像作为附件发送到邮件

Question

我正在实施一个用户输入详细信息的网站。用户还可以选择在表单中附加图像/pdf（小于 5MB）。 我想将整个图像存储在我的 MongoDB 中，并使用节点 nodemailer 将图像发送到我的邮件帐户。

其他一切正常，我可以使用用户输入的详细信息发送邮件，但无法将图像保存在我的数据库中或将其发送到邮件帐户。

下面是我实现的代码

server.js:-

const express = require("express");
const multer = require('multer');
const path = require('path');
const app = express ();
app.set("view engine", "ejs");
const mongoose= require("mongoose");
const router = express.Router();
const nodemailer = require('nodemailer');
const smtpTransport = require('nodemailer-smtp-transport');

const User=require("./models/User");

// Multer image start
const storage = multer.diskStorage({
    destination: function(req, file, cb) {
      cb(null, './public/uploads/');
    },
    filename: function(req, file, cb) {
      cb(null, new Date().toISOString().replace(/:/g, '-') + file.originalname); //replace is used to save in computer readable format
    }
  });

const upload = multer({
    storage: storage,
    limits: {
      fileSize: 1024 * 1024 * 5
    }
});

mongoose.connect("mongodb://localhost/emergen");
var bodyParser = require('body-parser');

//Middleware
app.use(express.static(__dirname + '/public'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));


var uploadFile = upload.single('image');
app.post('/send', uploadFile, (req, res) => {

    var name = req.body.name;
    var email = req.body.email;
    var phone = req.body.phone;
    var message = req.body.message;
    var image = req.file.originalname;
    var newUser= {name:name,email:email,phone:phone,message:message,image:image};

    User.create(newUser,function(err,newCreatedUser){
        if(err){
            console.log(err);
        }
        else{
            console.log(newCreatedUser);
        }
    })

    // Mailer implementation
    var output = `
      <p>You have a new Contact Request from Emergen Website</p>
      <h3>Contact Details</h3>
      <ul>  
        <li>Name: ${req.body.name}</li>
        <li>Email: ${req.body.email}</li>
        <li>Phone: ${req.body.phone}</li>
        <li>Phone: ${req.file.path}</li>
      </ul>
      <h3>Message</h3>
      <p>${req.body.message}</p>
    `;
    // <h3>Attachment</h3>  Attachments if need to be added above in output
    // <p>${req.body.attachment}</p>

    var transporter = nodemailer.createTransport(smtpTransport({
        service: 'gmail',
        host: 'smtp.gmail.com',
        auth: {
          user: 'JackRogers@gmail.com',
          pass: '******'
        }, tls:{
            rejectUnauthorized:false  // remove when uploading on server
          }
      }));

      var mailOptions = {
        from: 'qwerty@gmail.com',
        to: 'asd@gmail.com',
        subject: 'New Enquiry for Emergen',
        text: 'That was easy!',
        html: output
      };

      transporter.sendMail(mailOptions, function(error, info){
        if (error) {
          console.log(error);
        } else {
          console.log('Email sent: ' + info.response);
        }
        res.redirect('/contact-us');
      }); 
});

我的模型，User.js：-

    const mongoose=require("mongoose");

    const UserSchema= new mongoose.Schema({
        name:String,
        email:String,
        phone:Number,
        message:String,
        image: { data: Buffer, contentType: String }
    });

module.exports= mongoose.model("User",UserSchema);

我的表格，contact-us.ejs:-

<form class="text-center border border-light p-5" method="POST" action="send" enctype="multipart/form-data">

                                <p class="h4 mb-4">Contact us</p>

                                <!-- Name -->
                                <input type="text" id="FormName" class="form-control mb-4" placeholder="Name" name="name" required>

                                <!-- Email -->
                                <input type="email" id="FormEmail" class="form-control mb-4" placeholder="E-mail" name="email" required>

                                <input type="text" id="FormContact" class="form-control mb-4" placeholder="Contact No" name="phone" required>

                                <!-- Message -->
                                <div class="form-group">
                                    <textarea class="form-control rounded-0" id="exampleFormControlTextarea2" rows="5" placeholder="Message" name="message" required></textarea>
                                </div>
                                <!-- Attachment -->
                                <div class="form-group">
                                    <label for="name">Document Upload:</label>
                                    <input type="file" class="form-control" id="image" name="image" >
                                </div>                            
                                <!-- Send button -->
                                <button class="btn btn-info btn-block" type="submit">Send</button>

                            </form>

请帮帮我。坚持一会儿

Answer 1

一种方法是：

1. 将图像上传到您的服务器目录或某个文件托管站点。
2. 从您的本地服务器或文件托管服务器获取图像的 url。
3. 将该地址保存在您的数据库中。
4. 将该地址用作图片来源。