为什么node.js转换POST正文? [英] Why node.js convert POST body?

问题描述

想要将JPG二进制主体数据保存到OpenShift中的文件系统.但是以某种方式收到的信息将被转换.你知道为什么吗node.js是否有可能将数据视为文本并对其进行编码/解码?

Want to save JPG binary body data to file system in OpenShift. But somehow received info will get converted. Do you have any idea why? Is it possible that node.js treat data as text and does an encoding / decoding on it?

var myServer = http.createServer(function(request, response)
{
    var data = '';

    request.on('data', function (chunk){
        data += chunk;
    });

    request.on('end',function(){

    var date = new Date();
    var url_parts = url.parse(request.url,true);

    if(url_parts.pathname == '/setImage') {

        if(data != null && data.length > 0) {

            fs.writeFile('/var/lib/openshift/555dd1415973ca1660000085/app-root/data/asset/' + url_parts.query.filename, data, 'binary', function(err) {
                if (err) throw err
                console.log(date + ' File saved. ' + url_parts.query.filename  + ' ' + data.length)

                response.writeHead(200)
                response.end()
            })
        }
    }

推荐答案

您正在使用字符串初始化data，因此将chunk与+=一起添加到它也会将大块也转换为字符串(其中接受字符编码.

You are initializing data with a string, so adding chunk's with += to it will convert the chunks to string as well (which is subject to character encoding).

相反，您应该将块收集为Buffer的数组，并使用 创建最终的缓冲区:

Instead, you should collect the chunks as an array of Buffer's and use Buffer.concat() to create the final Buffer:

var chunks = [];

request.on('data', function (chunk){
    chunks.push(chunk);
});

request.on('end', function() {
  var data = Buffer.concat(chunks);
  ...
});

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