上传思路：
通过multer模块对文件上传，上传后存放到文件夹uploadfile中，然后读取该文件再写入到根目录下
1、index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h3>文件上传：</h3>
选择一个文件上传: <br />
<form action="/file_upload" method="post" enctype="multipart/form-data">
<input type="file" name="file" size="50" />
<br />
<input type="submit" value="上传文件" />
</form>
</body>
</html>
2、upload.js
var express = require('express');
var app = express();
var fs = require("fs");
var bodyParser = require('body-parser');
var multer = require('multer');
//app.use(express.static('public'));
//app.use(bodyParser.urlencoded({ extended: false }));
//文件上传模块 multer
app.use(multer({ dest: 'uploadfile/'}).array('file'));
app.get('/index.html', function (req, res) {
res.sendFile( __dirname + "/" + "index.html" );
})
app.post('/file_upload', function (req, res) {
console.log("上传的文件信息：",req.files[0]); // 上传的文件信息
var des_file = __dirname + "/" + req.files[0].originalname;
fs.readFile( req.files[0].path, function (err, data) {
fs.writeFile(des_file, data, function (err) {
if( err ){
console.log( err );
}else{
response = {
message:'File uploaded successfully',
filename:req.files[0].originalname
};
}
console.log( response );
res.end( JSON.stringify( response ) );
});
});
})
var server = app.listen(8081, function () {
var host = server.address().address
var port = server.address().port
console.log("应用实例，访问地址为 http://%s:%s", host, port)
})
3、执行node upload.js
在浏览器打开 http://127.0.0.1:8081/index.html