表单 – 如何处理node.js中的multipart / form-data

Uploading images using Node.js,Express,and Mongoose

这是一个例子：

// Expose modules in ./support for demo purposes
require.pathS.Unshift(__dirname + '/../../support');

/**
 * Module dependencies.
 */

var express = require('../../lib/express'),form = require('connect-form');

var app = express.createServer(
  // connect-form (http://github.com/visionmedia/connect-form)
  // middleware uses the formidable middleware to parse urlencoded
  // and multipart form data
  form({ keepExtensions: true })
);

app.get('/',function(req,res){
  res.send('<form method="post" enctype="multipart/form-data">'
    + '<p>Image: <input type="file" name="image" /></p>'
    + '<p><input type="submit" value="Upload" /></p>'
    + '</form>');
});

app.post('/',res,next){

  // connect-form adds the req.form object
  // we can (optionally) define onComplete,passing
  // the exception (if any) fields parsed,and files parsed
  req.form.complete(function(err,fields,files){
    if (err) {
      next(err);
    } else {
      console.log('\nuploaded %s to %s',files.image.filename,files.image.path);
      res.redirect('BACk');
    }
  });

  // We can add listeners for several form
  // events such as "progress"
  req.form.on('progress',function(bytesReceived,bytesExpected){
    var percent = (bytesReceived / bytesExpected * 100) | 0;
    process.stdout.write('Uploading: %' + percent + '\r');
  });
});

app.listen(3000);
console.log('Express app started on port 3000');

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