upload-test.js

function parseFile (req, res) {
    req.setEncoding('binary');
    var body = '';   // 文件数据
    var fileName = '';  // 文件名
    // 边界字符串
    var boundary = req.headers['content-type'].split('; ')[1].replace('boundary=','');
    req.on('data', function(chunk){
        body += chunk;
    });

    req.on('end', function() {
        var file = querystring.parse(body, '\r\n', ':')

        // 只处理图片文件
        if (file['Content-Type'].indexOf("image") !== -1)
        {
            //获取文件名
            var fileInfo = file['Content-Disposition'].split('; ');
            for (value in fileInfo){
                if (fileInfo[value].indexOf("filename=") != -1){
                    fileName = fileInfo[value].substring(10, fileInfo[value].length-1);

                    if (fileName.indexOf('\\') != -1){
                        fileName = fileName.substring(fileName.lastIndexOf('\\')+1);
                    }
                    console.log("文件名: " + fileName);
                }
            }

            // 获取图片类型(如：image/gif 或 image/png))
            var entireData = body.toString();
            var contentTypeRegex = /Content-Type: image\/.*/;

            contentType = file['Content-Type'].substring(1);

            //获取文件二进制数据开始位置，即contentType的结尾
            var upperBoundary = entireData.indexOf(contentType) + contentType.length;
            var shorterData = entireData.substring(upperBoundary);

            // 替换开始位置的空格
            var binaryDataAlmost = shorterData.replace(/^\s\s*/, '').replace(/\s\s*$/, '');

            // 去除数据末尾的额外数据，即: "--"+ boundary + "--"
            var binaryData = binaryDataAlmost.substring(0, binaryDataAlmost.indexOf('--'+boundary+'--'));

            // 保存文件
            fs.writeFile(fileName, binaryData, 'binary', function(err) {
                res.end('图片上传完成');
            });
        } else {
            res.end('只能上传图片文件');
        }
    });
}


const http = require('http');
const fs = require('fs');
const querystring =require('querystring');

//用http模块创建一个http服务端
http.createServer(function(req, res) {
    if (req.url == '/upload' && req.method.toLowerCase() === 'get') {
        //显示一个用于文件上传的form
        res.writeHead(200, {'content-type': 'text/html'});
        res.end(
            '<form action="/upload" enctype="multipart/form-data" method="post">'+
            '<input type="file" name="upload" multiple="multiple" />'+
            '<input type="submit" value="Upload" />'+
            '</form>'
        );
    } else if (req.url == '/upload' && req.method.toLowerCase() === 'post') {
        if(req.headers['content-type'].indexOf('multipart/form-data')!==-1)
            parseFile(req, res)
    } else {
        res.end('其它提交方式');
    }
}).listen(3000);