用node.js上传图像并表达的简单方法? [英] Simple way to upload image with node.js and express?

问题描述

我发现很少有文章解释该过程，但是其中大多数都不是最新的. 您如何在node.js中处理图片上传?

I've found few articles explaining the process but most of them are not up do date. How do you handle image upload in node.js?

推荐答案

我使用 busboy中间件快速解析多部分/表单数据请求中的图像，效果很好.

I use busboy middleware in express to parse out images in a multipart/form-data request and it works pretty nice.

我的代码如下:

const busboy = require('connect-busboy');
//...
app.use(busboy());

app.use(function parseUploadMW(req,res,next){
  req.busboy.on('file', function onFile(fieldname, file, filename, encoding, mimetype) {
    file.fileRead = [];
    file.on('data', function onData(chunk) {
      this.fileRead.push(chunk);
    });
    file.on('error', function onError(err) {
      console.log('Error while buffering the stream: ', err);
      //handle error
    });
    file.on('end', function onEnd() {
      var finalBuffer = Buffer.concat(this.fileRead);
      req.files = req.files||{}
      req.files[fieldname] = {
        buffer: finalBuffer,
        size: finalBuffer.length,
        filename: filename,
        mimetype: mimetype.toLowerCase()
      };
    });
  });
  req.busboy.on('finish', function onFinish() {
    next()
  });
  req.pipe(req.busboy);
})

然后，文件将在快速路线的req.files中位于您的req对象中.

Then files will be in the req object for you at req.files in your express routes.

此技术适用于小图像.如果您要进行一些硬核上载，则可能要考虑将文件流化(以节省内存)到其目的地-如s3或类似文件-

This technique works fine for small images. If you are doing some hardcore uploading, you may want to consider streaming the files (to save memory) to their destination - like s3 or similar - which can also be achieved with busboy

另一个受欢迎且不错的软件包是: https://github.com/andrewrk/node-多方.

Another package that is popular and also decent is: https://github.com/andrewrk/node-multiparty.

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