NodeJs 读取服务器文件

NodeJs 读取视频文件

近期接到项目需求：用户上传自己录制的视频，然后可以在前端查看处理后的视频文件：

• 前端上传视频
• node接收并保存
• node读取视频文件
• node流传输

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前端上传

用户录制自己的视频文件，并上传到服务器端：

代码块

前端使用jquery的ajax，核心代码：

                var oMyForm = new FormData(); // 创建一个空的FormData对象                var videoBlob = new Blob(recordedBlobs, {                    type: 'video/mp4'                }); //blob对象存储视频数据                oMyForm.append("videoData", videoBlob);                oMyForm.append("timeFileName", newFileName);                oMyForm.append("userFileName", fileName);                oMyForm.append("interview", JSON.stringify(interview));                $.ajax({                    type: "POST",                    url: "/study-video/video/upload",                    data: oMyForm,                    processData: false, //  告诉jquery不要处理发送的数据                    contentType: false, // 告诉jquery不要设置content-Type请求头                    success: function (msg) {                        //上传中 隐藏                        console.log(msg);                    }                });

node保存视频文件/读取后-流传输给前端

用户录制自己的视频文件，并上传到服务器端：

代码块

前端使用jquery的ajax，核心代码：

var router = require('express').Router();var fs = require('fs');var path = require('path');const os = require('os');var config = require('../config/index');var interviewInner = config.interview.inner;var proxy = require('../serviceProxy/proxy');var http = require('http');var request = require('request');//busboy 文件处理请求function handleFiles(req, res, next) {    req.files = {};    req.busboy.on('file', function (fieldName, file, fileName, encoding, mimeType) {        if (!fileName) {            return;        }        file.fileRead = [];        console.log('uploading: ', fileName);        console.log(file);        file.on('data', function (data) {            console.log('File [' + fieldName + '] got ' + data.length + ' bytes');            file.fileRead.push(data);        });        file.on('end', function () {            var finalBuffer = Buffer.concat(this.fileRead);            req.files[fieldName] = {                buffer: finalBuffer,                size: finalBuffer.length,                filename: fileName,                mimetype: mimeType            };            console.log('File [' + fieldName + '] Finished');        });    });    req.busboy.on('field', function (key, value, keyTruncated, valueTruncated) {        console.log(key, '=', value);        req.body[key] = value;    });    req.busboy.on('finish', function () {        console.log('busboy finish');        next();    });    return req.pipe(req.busboy);}function composeUrl(host, port, path) {    return 'http://' + host + ':' + port + path;}router    .get('/interview/:path', function(req, res, next){        var video_path = decodeURIComponent(req.params.path);        if (video_path.endsWith('.mp4') && fs.existsSync(video_path) && fs.statSync(video_path).isFile()) {            //exists 流传输给前端，前端直接访问route即可            res.set({                "Content-type":"application/octet-stream",                "Content-Disposition":"attachment;filename="+ 'bplus.mp4'            });            var fReadStream = fs.createReadStream(video_path);            fReadStream.on("data",(chunk) => res.write(chunk,"binary"));            fReadStream.on("end",function () {                res.end();            });        }else{            res.send({                msg: 'not found :' + video_path            })        }    })    .post('/video/upload', handleFiles, function(req, res, next){        var interview = JSON.parse(req.body.interview);        var base = config.ugcVideoFolder;        if (!base) {            base = os.tmpdir();        }        //save video        var tmp_path1 = path.join(base, path.basename(req.body.timeFileName + '.mp4'));        fs.writeFileSync(tmp_path1, req.files['videoData'].buffer);        //save audio        var tmp_path2 = path.join(base, path.basename(req.body.timeFileName + '.wav'));        fs.writeFileSync(tmp_path2, req.files['audioData'].buffer);        //POST 传给后台，body的数据格式        var interviewData = {            interview_name: interview.interview_name,            member_id: res.locals.hcd_user.member_id || 'c7b6d3fb-32ea-4606-8358-3b7c70fb1dea',            interview_time: new Date(),            file_name: req.body.userFileName,            questions: [                {                    question_num: 1,                    question_description: "自我介绍",                    video_path: tmp_path1,                    video_name: req.body.timeFileName + '.mp4',                    audio_path: tmp_path2,                    audio_name: req.body.timeFileName + '.wav',                    video_length: interview.questions[0].upload_time                }            ]        };        //调用interview-service 保存数据 请求第三方server        request({            url: composeUrl(interviewInner.host, interviewInner.port, '/interview-info/upload'),            method: "POST",            json: false,            headers: {                "content-type": "application/json"            },            body: JSON.stringify(interviewData)        }, function (err, data) {            if(err){                res.send({                    msg: 'server error'                });            }else{                res.send(data);            }        });    });module.exports = router;

记录工作中学习的一些新东西，截取项目中部分核心代码。