我正在上传图像,但当我尝试实现一个功能时,我可以更改文件名以包含存储后的日期。
使用下面的代码,我将得到一个空对象,但仍然是一条成功的消息。 但是,如果我取消代码中的注释,它将起作用,但不会包含日期。
const express = require("express");
const multer = require("multer");
const app = express();
const fileFilter = function(req, file, cb){
const allowedTypes = ["image/jpeg","image/png", "image/gif"];
if(!allowedTypes.includes(file.mimetype)) {
const error = new Error("wrong file type");
error.code = "LIMIT_FILE_TYPES";
return cb(error, false);
}
cb(null, true);
}
const storage = multer.diskStorage({
destination:function(req, file, cb){
cb(null, './uploads/')
},
filename:function(req, file, cb){
cb(null, file + '-' + Date.now())
}
});
const MAX_SIZE = 200000
const upload = multer({
// dest: './uploads/', If I un-comment this line it will upload the image but will not change file name will still be random hash numbers
fileFilter,
storage:storage,
limits:{
fileSize: MAX_SIZE
}
});
app.post('/upload', upload.single('file'), (req, res) => {
res.json({file:req.file});
});
app.use(function(err, req, res, next) {
if(err.code === "LIMIT_FILE_TYPES") {
res.status(422).json({error:"Only Images are Allowed"});
return;
}
if (err.code ==="LIMIT_FILE_SIZE"){
res.status(422).json({error:`Size is to Large, Max size is ${MAX_SIZE/
1000}KB`});
return;
}
});
app.listen(3344, () => console.log("running local on 3344"));
最佳答案
它返回未定义,因为您正在创建一个组合文件对象 + '-' + Date.now() 的字符串,因此更改此行:
cb(null, file + '-' + Date.now())
对于这个:
cb(null, file.fieldname + '-' + Date.now())
它应该可以完成这项工作。
关于node.js - Multer 返回空响应,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54115957/