节点/ Express文件上传-Java 学习之路

我正在使用节点v0.10.26并表达v4.2.0，我对节点很新 . 在过去三个小时左右的时间里，我一直在我的 table 上打我的脑袋试图获得一个与节点一起使用的文件上传表单 . 在这一点上，我只是想让req.files不返回undefined . 我的观点看起来像这样

<!DOCTYPE html>
<html>
  <head>
    <title>{{ title }}</title>
    <link rel='stylesheet' href='/stylesheets/style.css' />
  </head>
  <body>
    <h1>{{ title }}</h1>
    <p>Welcome to {{ title }}</p>
        <form method='post' action='upload' enctype="multipart/form-data">
        <input type='file' name='fileUploaded'>
        <input type='submit'>


</form>
  </body>
</html>

这是我的路线

var express = require('express');
var router = express.Router();


/* GET home page. */
router.get('/', function(req, res) {
  res.render('index', { title: 'Express' });
});

router.post('/upload', function(req, res){
console.log(req.files);
});

module.exports = router;

这是我的app.js

var express = require('express');
var path = require('path');
var favicon = require('static-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

var routes = require('./routes/index');
var users = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'hjs');

app.use(favicon());
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded());
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', routes);
app.use('/users', users);

/// catch 404 and forward to error handler
app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
});

/// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
    app.use(function(err, req, res, next) {
        res.status(err.status || 500);
        res.render('error', {
            message: err.message,
            error: err
        });
    });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
        message: err.message,
        error: {}
    });
});



module.exports = app;

我看到某个地方包括 methodOverride() 和 bodyParser({keepExtensions:true,uploadDir:path}) 本来应该有所帮助，但如果我添加这些行，我甚至无法启动我的服务器 .

6 回答

ExpressJS问题：

大多数中间件都是从快递4中删除的 . 退房：http://www.github.com/senchalabs/connect#middleware对于像busboy，busboy-connect，强大，流量，分开的多部分中间件需要 .

此示例使用connect-busboy中间件 . create / img和/ public文件夹 .
使用文件夹结构：

\ server.js

\ img \“将内容上传到”

\ PUBLIC \ index.html的

SERVER.JS

var express = require('express');    //Express Web Server 
var busboy = require('connect-busboy'); //middleware for form/file upload
var path = require('path');     //used for file path
var fs = require('fs-extra');       //File System - for file manipulation

var app = express();
app.use(busboy());
app.use(express.static(path.join(__dirname, 'public')));

/* ========================================================== 
Create a Route (/upload) to handle the Form submission 
(handle POST requests to /upload)
Express v4  Route definition
============================================================ */
app.route('/upload')
    .post(function (req, res, next) {

        var fstream;
        req.pipe(req.busboy);
        req.busboy.on('file', function (fieldname, file, filename) {
            console.log("Uploading: " + filename);

            //Path where image will be uploaded
            fstream = fs.createWriteStream(__dirname + '/img/' + filename);
            file.pipe(fstream);
            fstream.on('close', function () {    
                console.log("Upload Finished of " + filename);              
                res.redirect('back');           //where to go next
            });
        });
    });

var server = app.listen(3030, function() {
    console.log('Listening on port %d', server.address().port);
});

INDEX.HTML

<!DOCTYPE html>
<html lang="en" ng-app="APP">
<head>
    <meta charset="UTF-8">
    <title>angular file upload</title>
</head>

<body>
        <form method='post' action='upload' enctype="multipart/form-data">
        <input type='file' name='fileUploaded'>
        <input type='submit'>
 </body>
</html>

以下将与强大的SERVER.JS一起使用

var express = require('express');   //Express Web Server 
var bodyParser = require('body-parser'); //connects bodyParsing middleware
var formidable = require('formidable');
var path = require('path');     //used for file path
var fs =require('fs-extra');    //File System-needed for renaming file etc

var app = express();
app.use(express.static(path.join(__dirname, 'public')));

/* ========================================================== 
 bodyParser() required to allow Express to see the uploaded files
============================================================ */
app.use(bodyParser({defer: true}));
 app.route('/upload')
 .post(function (req, res, next) {

  var form = new formidable.IncomingForm();
    //Formidable uploads to operating systems tmp dir by default
    form.uploadDir = "./img";       //set upload directory
    form.keepExtensions = true;     //keep file extension

    form.parse(req, function(err, fields, files) {
        res.writeHead(200, {'content-type': 'text/plain'});
        res.write('received upload:\n\n');
        console.log("form.bytesReceived");
        //TESTING
        console.log("file size: "+JSON.stringify(files.fileUploaded.size));
        console.log("file path: "+JSON.stringify(files.fileUploaded.path));
        console.log("file name: "+JSON.stringify(files.fileUploaded.name));
        console.log("file type: "+JSON.stringify(files.fileUploaded.type));
        console.log("astModifiedDate: "+JSON.stringify(files.fileUploaded.lastModifiedDate));

        //Formidable changes the name of the uploaded file
        //Rename the file to its original name
        fs.rename(files.fileUploaded.path, './img/'+files.fileUploaded.name, function(err) {
        if (err)
            throw err;
          console.log('renamed complete');  
        });
          res.end();
    });
});
var server = app.listen(3030, function() {
console.log('Listening on port %d', server.address().port);
});

回复于 2024-04-30T02:27:18+08:00

22
另一个选择是使用multer，它在引擎盖下使用busboy，但设置起来比较简单 .
```
var multer = require('multer');
```
使用multer并设置上传目的地：
```
app.use(multer({dest:'./uploads/'}));
```
在视图中创建表单，multer工作需要 enctype='multipart/form-data ：
```
form(role="form", action="/", method="post", enctype="multipart/form-data")
    div(class="form-group")
        label Upload File
        input(type="file", name="myfile", id="myfile")
```
然后在POST中，您可以访问有关该文件的数据：
```
app.post('/', function(req, res) {
  console.dir(req.files);
});
```
有关此内容的完整教程可以在here找到 .
回复于 2024-04-30T02:27:18+08:00
0
这是Mick Cullen的answer的简化版本（要点） - 部分是为了证明它不需要阅读页面和代码页面 .

你必须让你的应用程序使用connect-busboy：
```
var busboy = require("connect-busboy");
app.use(busboy());
```
在触发它之前，这不会做任何事情 . 在处理上传的调用中，执行以下操作：
```
app.post("/upload", function(req, res) {
    if(req.busboy) {
        req.busboy.on("file", function(fieldName, fileStream, fileName, encoding, mimeType) {
            //Handle file stream here
        });
        return req.pipe(req.busboy);
    }
    //Something went wrong -- busboy was not loaded
});
```
让我们打破这个：
- 您检查是否设置了 req.busboy （正确加载了中间件）
- 您在 req.busboy 上设置 "file" 侦听器
- 您将 req 的内容管道传输到 req.busboy
在文件监听器中有几个有趣的东西，但真正重要的是 fileStream ：这是Readable，然后可以像往常一样写入文件 .

陷阱： You must handle this Readable, or express will never respond to the request ，见the busboy API（ file 部分） .
回复于 2024-04-30T02:27:18+08:00

我需要比其他答案提供更多细节（例如，如何将文件写入我在运行时决定的位置？） . 希望这对其他人有帮助：

得到连接busboy：

npm install connect-busboy --save

在您的server.js中，添加这些行

let busboy = require('connect-busboy')

// ... 

app.use(busboy());

// ... 

app.post('/upload', function(req, res) {
    req.pipe(req.busboy);
    req.busboy.on('file', function(fieldname, file, filename) {
        var fstream = fs.createWriteStream('./images/' + filename); 
        file.pipe(fstream);
        fstream.on('close', function () {
            res.send('upload succeeded!');
        });
    });
});

这似乎省略了错误处理，但如果我发现它将编辑它 .

回复于 2024-04-30T02:27:18+08:00

我发现这个，简单而有效：

app.post('/upload', function(req, res) {
   if (!req.files)
      return res.status(400).send('No files were uploaded.');

   // The name of the input field (i.e. "sampleFile") is used to retrieve the uploaded file
   let sampleFile = req.files.sampleFile;

   // Use the mv() method to place the file somewhere on your server
   sampleFile.mv('/somewhere/on/your/server/filename.jpg', function(err) {
   if (err)
      return res.status(500).send(err);

   res.send('File uploaded!');
});

express-fileupload

回复于 2024-04-30T02:27:18+08:00

Multer是一个用于处理multipart / form-data的node.js中间件，主要用于上传文件 . 它写在busboy之上，以实现最高效率 .

npm install --save multer


in app.js

    var multer  =   require('multer');
    var storage = multer.diskStorage({
      destination: function (req, file, callback) {
        callback(null, './public/uploads');
      },
      filename: function (req, file, callback) {
        console.log(file);
        callback(null, Date.now()+'-'+file.originalname)
      }
    });

    var upload = multer({storage: storage}).single('photo');

    router.route("/storedata").post(function(req, res, next){

        upload(req, res, function(err) {
          if(err) {
            console.log('Error Occured');
            return;
          }
          var userDetail = new mongoOp.User({
            'name':req.body.name,
            'email':req.body.email,
            'mobile':req.body.mobile,
            'address':req.body.address
          });

          console.log(req.file);

          res.end('Your File Uploaded');
          console.log('Photo Uploaded');

          userDetail.save(function(err,result){
          if (err) {
            return console.log(err)
          }
          console.log('saved to database') 
        })
      })

      res.redirect('/')

    });

回复于 2024-04-30T02:27:18+08:00

节点/ Express文件上传

6 回答

相关问题