先复习下整个请求的过程
const express = require(‘express‘);
const static = require(‘express-static‘);
const cookieParser = require(‘cookie-parser‘);
const cookieSession = require(‘cookie-session‘);
const bodyParser = require(‘body-parser‘);
const multer = require(‘multer‘);
const ejs = require(‘ejs‘);
const jade = require(‘jade‘);
const server = express();
server.listen(8999);
// 解析cookie
server.use(cookieParser(‘dfadfasdfa‘));
// 解析session
let arr = [];
for(let i = 0; i < 100000; i++) {
arr.push(‘key_‘ + Math.random());
}
server.use(cookieSession({name: ‘jason_name‘, keys: arr, maxAge: 20*3600*1000}));
// post数据
server.use(bodyParser.urlencoded({extended: false}));
server.use(multer({dest: ‘./www/upload‘}).any());
// 用户请求
server.use(‘/‘, (req, res, next) => {
console.log(req.query, req.body, req.files, req.cookie, req.session);
});
server.use(static(‘./www‘));
测试下能不能上传
const express = require(‘express‘);
const bodyParser = require(‘body-parser‘);
const multer = require(‘multer‘);
// fs 可以用来添加上传文件的扩展名(重命名)
const fs = require(‘fs‘);
const pathLib = require(‘path‘);
const server = express();
// 创建一个上传文件对象
// let objMulter = multer({dest: ‘./www/upload‘});
server.use(bodyParser.urlencoded({extended: false}));
// server.use(objMulter.any());
server.post(‘/‘, (req, res) => {
console.log(‘req.body==>‘,req.body);
// 当请求是 enctype=application/x-www-form-urlencoded
// req.body==> { f1: ‘mmexport1485905379121.jpg‘ }
// 当请求是 multertype/form-type
// req.body==> {}
// console.log(‘req.files==>‘, req.files);
});
server.listen(8999);
上传的表单文件
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>文件上传</title>
</head>
<body>
<form action="http://localhost:8999" method="post" enctype="application/x-www-form-urlencoded">
<!-- <form action="http://localhost:8999" method="post" enctype="multipart/form-data"> -->
<!-- <form action="http://localhost:8999" method="post" enctype="text/plain"> -->
文件： <input type="file" name="f1"> <br/>
<input type="submit" value="上传">
</form>
</body>
</html>
这是因为body-parser 只能处理application/x-www-form-urlencoded
文件上传 需要使用 multer 模块 用来处理 multipart/form-data
const express = require(‘express‘);
const bodyParser = require(‘body-parser‘);
const multer = require(‘multer‘);
// fs 可以用来添加上传文件的扩展名(重命名)
const fs = require(‘fs‘);
const pathLib = require(‘path‘);
const server = express();
// 创建一个上传文件对象
let objMulter = multer({dest: ‘./www/upload‘});
// server.use(bodyParser.urlencoded({extended: false}));
server.use(objMulter.any());
server.post(‘/‘, (req, res) => {
// console.log(‘req.body==>‘,req.body);
console.log(‘req.files==>‘, req.files);
// req.files==> [ { fieldname: ‘f1‘,
// originalname: ‘IMG_20170125_212945.jpg‘,
// encoding: ‘7bit‘,
// mimetype: ‘image/jpeg‘,
// destination: ‘./www/upload‘,
// filename: ‘fa0b73da8bdbcb36e9480e9869c0a2b7‘,
// path: ‘www\\upload\\fa0b73da8bdbcb36e9480e9869c0a2b7‘,
// size: 226929 } ]
});
server.listen(8999);
这个时候你会发现文件上传了，但是文件名没有扩展名
fs中重名的函数rename
fs.rename(‘a.txt‘, ‘b.txt‘, (err) => {
console.log(err);
});
获取扩展名的插件 path 可以小小的测试下 这个node中的path插件
const path = require(‘path‘);
let str = ‘c:\\wamp\\www\\a.html‘;
let obj = path.parse(str);
console.log(obj);
// {
// root: ‘c:\\‘,
// dir: ‘c:\\wamp\\www‘,
// base: ‘a.html‘,
// ext: ‘.html‘,
// name: ‘a‘
// }
// base 文件名部分
// ext 扩展名部分
// dir 文件路径（目录）
// name 文件名（不包含扩展名）
然后讲path插件添加进文件
const express = require(‘express‘);
const bodyParser = require(‘body-parser‘);
const multer = require(‘multer‘);
// fs 可以用来添加上传文件的扩展名(重命名)
const fs = require(‘fs‘);
const pathLib = require(‘path‘);
const server = express();
// 创建一个上传文件对象
let objMulter = multer({dest: ‘./www/upload‘});
// server.use(bodyParser.urlencoded({extended: false}));
server.use(objMulter.any());
server.post(‘/‘, (req, res) => {
// console.log(‘req.body==>‘,req.body);
console.log(‘req.files==>‘, req.files);
// req.files==> [ { fieldname: ‘f1‘,
// originalname: ‘IMG_20170125_212945.jpg‘,
// encoding: ‘7bit‘,
// mimetype: ‘image/jpeg‘,
// destination: ‘./www/upload‘,
// filename: ‘fa0b73da8bdbcb36e9480e9869c0a2b7‘,
// path: ‘www\\upload\\fa0b73da8bdbcb36e9480e9869c0a2b7‘,
// size: 226929 } ]
//1.获取原始的扩展名 2.重命名临时文件
let newName = req.files[0].path + pathLib.parse(req.files[0].originalname).ext
fs.rename(req.files[0].path, newName, (err) => {
if(err) {
console.log(‘重命名失败‘);
}else {
console.log(‘命名成功‘);
}
});
});
// req.files==> [ { fieldname: ‘f1‘,
// originalname: ‘IMG_20170125_212945.jpg‘,
// encoding: ‘7bit‘,
// mimetype: ‘image/jpeg‘,
// destination: ‘./www/upload‘,
// filename: ‘bb031c31a1016648703a0d54cc93f674‘,
// path: ‘www\\upload\\bb031c31a1016648703a0d54cc93f674‘,
// size: 226929 } ]
// 命名成功
server.listen(8999);
到此，文件成功的保存到磁盘中，并且大小一致
总结：
body-parser 解析post数据 application/x-www-form-urlencoded
multer 解析post文件 multipart/form-data
let obj = multer({dest: ‘上传路径‘});
server.use(obj.any());
server.use( (req, res) => {
req.files[0].originalname
req.files[0].path
});
fs.rename(老名字， 新名字, (err) => {
});
时间： 2024-08-10 17:19:21