文章主要记录如何实现使用express连接数据库，做增删改查，关联数据库，封装路由，jsonwebtoken鉴权，bcrypt登录密码加密，multer文件上传和一些请求数据的处理，开发日志记录。
multer上传图片
multer注意事项
multer上传格式是form-data
const express = require('express');
const router = express.Router();
const mongoose = require('mongoose');
// 引入multer
const multer = require('multer');
const storage = multer.diskStorage({
// 上传图片的存放位置在uploads
destination: function(req, file, cb) {
cb(null, './uploads/');
},
// windows下使用-代替：
filename: function(req, file, cb) {
cb(null, new Date().toISOString().replace(/:/g, '-') + file.originalname)
}
})
const fileFilter = (req, file, cb) => {
//判断上传图片类型
if (file.mimetype === 'image/jpg' || file.mimetype === 'image/png') {
cb(null, true);
} else {
cb(null, false);
}
}
// limit上传图片尺寸限制
const uploads = multer({
storage: storage,
limit: {
fileSize: 1024 * 1024 * 5
},
fileFilter: fileFilter
});
// 接受一个文件。这个文件的信息保存在 req.file。最终存放在uploads
router.post('/', uploads.single('productImage'), (req, res, next) => {
console.log(req.file)
const product = new Product({
_id: new mongoose.Types.ObjectId(),
name: req.body.name,
price: req.body.price,
productImage: req.file.path
});
product
.save()
.then(result => {
res.status(201).json({
message: "created product successfully",
createdProduct: {
name: result.name,
price: result.price,
_id: result._id,
productImage: result.productImage,
request: {
type: 'GET',
url: 'http://localhost:3000/products/' + result._id
}
}
})
})
.catch(err => {
res.status(500).json({
error: err
})
})
})
