file-io – nodejs express和文件上传

好吧,所以我已经尝试过使用连接形式,但由于某些原因我无法让它工作,但我想我应该理解这是如何从头开始半无论如何.

我不明白我上传的multipart / formdata文件的位置,或者当我的应用程序发布到网址时如何在我的应用程序中访问它. – 我喜欢直接访问文件数据,并使用节点fs模块写入文件输出. – 例如：

app.post('/testy',function(req,res){
       console.log(req.body);
       console.log(req.headers);
       res.redirect('back');

    });  

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

因此,实际记录的唯一req var是req标头,body是空的. (可能应该是我理解的).但我得到的是文件数据在哪里？寻找我想的$_FILES数组的PHP等价物. – 这是我记录的标题.

'accept: 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8','accept-language': 'en-us,en;q=0.5','accept-encoding': 'gzip,deflate','accept-charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.7','keep-alive': '115',connection: 'keep-alive',referer: 'http://127.0.0.1:3000/testy',cookie: 'connect.sid=lDRpluTxjUJeuTmkXlybrYeZ.JYTB155s2DGce2dsyfv1Op5ISCY8uqyqJZK8NjlZ5jM; socketio=flashsocket','x-insight': 'activate','content-type': 'multipart/form-data; boundary=---------------------------5856401949371863571646035001','content-length': '30128' }

任何关于我失踪的东西都会被人们所喜爱！

解决方法

这是非常详细的没有连接形式的版本.正如您所看到的,这不是有效的,而是试图对其工作方式发挥指导作用.

var express = require('express'),fs = require('fs');
    app = express.createServer();

app.post('/testy',res){
  var body = '';
  var header = '';
  var content_type = req.headers['content-type'];
  var boundary = content_type.split('; ')[1].split('=')[1];
  var content_length = parseInt(req.headers['content-length']);
  var headerFlag = true;
  var filename = 'dummy.bin';
  var filenameRegexp = /filename="(.*)"/m;
  console.log('content-type: ' + content_type);
  console.log('boundary: ' + boundary);
  console.log('content-length: ' + content_length);

  req.on('data',function(raw) {
    console.log('received data length: ' + raw.length);
    var i = 0;
    while (i < raw.length)
      if (headerFlag) {
        var chars = raw.slice(i,i+4).toString();
        if (chars === '\r\n\r\n') {
          headerFlag = false;
          header = raw.slice(0,i+4).toString();
          console.log('header length: ' + header.length);
          console.log('header: ');
          console.log(header);
          i = i + 4;
          // get the filename
          var result = filenameRegexp.exec(header);
          if (result[1]) {
            filename = result[1];
          }
          console.log('filename: ' + filename);
          console.log('header done');
        }
        else {
          i += 1;
        }
      }
      else { 
        // parsing body including footer
        body += raw.toString('binary',i,raw.length);
        i = raw.length;
        console.log('actual file size: ' + body.length);
      }
  });

  req.on('end',function() {
    // removing footer '\r\n'--boundary--\r\n' = (boundary.length + 8)
    body = body.slice(0,body.length - (boundary.length + 8))
    console.log('final file size: ' + body.length);
    fs.writeFileSync('files/' + filename,body,'binary');
    console.log('done');
    res.redirect('back');
  })
});  

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

app.listen(4000);