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公司装修哪家比较好,宁波seo优化报价多少,运营,工商登记查询网官网提示：学习express，搭建管理系统文章目录前言一、安装multer，fs-extra二、新建config/upload.js三、新建routes/upload.js四、修改routes下的index.js五、修改index.js六、新建上传文件test.html七、开启jwt验证token，通过login接…

提示：学习express，搭建管理系统

文章目录

前言
一、安装multer，fs-extra
二、新建config/upload.js
三、新建routes/upload.js
四、修改routes下的index.js
五、修改index.js
六、新建上传文件test.html
七、开启jwt验证token，通过login接口生成token
总结

前言

需求：主要学习express，所以先写service部分

一、安装multer，fs-extra

npm install multer --save
npm install fs-extra --save

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二、新建config/upload.js

upload.js

const fs = require('fs');
const fsExtra = require('fs-extra');
const path = require('path');
const rootDir = path.resolve(__dirname,'../upload/');
const temporaryDir = path.resolve(__dirname,'../upload/temporary/');
const errFun = (msg,code)=>{return {code:code||500,success:false,msg:msg||'操作失败'}
}
const sucFun = (data,msg)=>{return {code:200,success:true,msg:msg||'操作成功',data,}
}
const uploadUtil = {upload:(req)=>{const { fileMD5,chunkMD5 } = req.body;return new Promise ((resolve,reject)=>{const folderPath = temporaryDir+'/'+fileMD5;const filePath = temporaryDir+'/'+fileMD5+'/'+chunkMD5if(!fs.existsSync(folderPath))fs.mkdirSync(folderPath);fs.writeFile(filePath,req.file.buffer,(err)=>{if(err)reject(errFun('切片上传失败'));resolve(sucFun({},'上传成功'));})});},merge:async(req)=>{const {fileMD5,chunkMD5Arr,type} = req.body;const folderPath = temporaryDir+'/'+fileMD5;let chunkBufferArr = [];for(let i=0;i<chunkMD5Arr.length;i++){let chunkBuffer = await fs.readFileSync(folderPath+'/'+chunkMD5Arr[i]);chunkBufferArr.push(chunkBuffer);}console.log(chunkBufferArr)let fileurl = rootDir+'/images/'+fileMD5+'-'+(new Date().getTime())+'.'+type;fs.writeFile(fileurl,Buffer.concat(chunkBufferArr),(err)=>{if(err)errFun(fileMD5+'文件切片merge失败');sucFun({url:fileurl},'文件切片merge成功');//删除临时文件夹以及文件夹下的所有文件fsExtra.removeSync(folderPath);});}
}
module.exports = uploadUtil;

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三、新建routes/upload.js

const uploadUtil = require('../config/upload');
//文件流的key与multer的single方法的参数param,必须保持一致，不一致接收不到文件流//fd.append('xxx',chunk);//multer().single('xxxx');const multer = require('multer');
const chunk = multer().single('chunk');const uploadRoutes = (router)=>{router.post('/upload/upload',chunk,async (req,res)=>{const result = await uploadUtil.upload(req);res.json(result);});router.post('/upload/merge',async (req,res)=>{const result = await uploadUtil.merge(req);res.json(result);});
}
module.exports = uploadRoutes;

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四、修改routes下的index.js

const userRoutes = require('./user');
const uploadRoutes = require('./upload');
const routes = (router)=>{//user路由userRoutes(router);//upload路由uploadRoutes(router);
}module.exports = routes;

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五、修改index.js

注释jwt的token验证，方便测试。如果打开验证，需要通过login接口生成token，上传文件request请求头部携带

const express = require('express');
const app = express();
const router = express.Router();
const jwt = require('./config/jwt');const bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());const port = 1990;app.all('*',  (req, res, next) => {res.header('Access-Control-Allow-Origin', '*');res.header("Access-Control-Allow-Headers", "Authorization,token,content-type");res.header('Access-Control-Allow-Methods', '*');res.header('Content-Type', 'application/json;charset=utf-8');next();
});//全局验证token
// app.use('/*',(req,res,next)=>{
//     let notValidateData = ['/user/login','/user/register'];
//     if(notValidateData.indexOf(req.baseUrl)>-1)return next();
//     if((jwt.verify(req.headers.authorization||'')||{}).success)return next();
//     return res.json({success:false,code:500,msg:'token验证失败'});
// })//初始化路由
require('./routes/index')(router);app.use('/', router);
app.listen(port,()=>{console.log('http://localhost:'+port);
})

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六、新建上传文件test.html

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>test upload</title>
</head>
<body><input type="file" onchange="goUpload(this.files)"><script type="text/javascript" src="https://cdn.bootcss.com/axios/0.19.0-beta.1/axios.js"></script><script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/blueimp-md5/2.16.0/js/md5.js"></script><script>const reader = new FileReader();const instance = axios.create({baseURL: 'http://localhost:1990/', //后台接口url+porttimeout: 5000,headers: {'Content-Type': 'multipart/form-data',"authorization":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyTmFtZSI6Imxvbmdsb25nYWdvMSIsInBhc3N3b3JkIjoibG9uZzEyMzQ1NiIsImlhdCI6MTcwOTIwMjQ1NiwiZXhwIjoxNzA5MjA2MDU2fQ.XztBbjm2BbeQB7-OIXX040xuNxR5gnioCCgNV2c5NGI",},withCredentials: false, // defaultresponseType: 'json', // defaultmaxContentLength: 2000,});//上传文件计数对象let postFileObj = {};//上传切片计数对象let postChunkObj = {};//组件上传文件const goUpload = (files)=>{postFileObj = {};postChunkObj = {};upload(files[0])}//上传文件const upload = async (file)=>{//文件blobconst fileBlob = file.slice(0,file.size);//文件hash，用作后端新建临时文件夹名和上传完成的文件命名参数  并且，相同文件内容(文件名可不同)进行上传，生成的fileMD5是相同的，如有需要，可根据存储的文件名判断，不需要重新上传const fileMD5 = await blodToString(fileBlob);//切片数组const chunks = fileToChunks(file);//切片hash 用来命名生成的临时文件，并在所有切片上传完成，按顺序，读取切片，生成文件，如果不按照顺序，生成文件会因为写入顺序不对而乱码const chunkMD5Arr = [];//初始化当前文件上传计数if(!postFileObj[fileMD5])postFileObj[fileMD5] = {count:1}for(let i=0;i<chunks.length;i++){const chunkMD5 = await blodToString(chunks[i]);chunkMD5Arr.push(chunkMD5);//初始化key为fileMD5的切片组postChunkObj[fileMD5] = {};//初始化key为fileMD5的切片组中key为chunkMD5的切片计数对象postChunkObj[fileMD5][chunkMD5] = {success:false,count:1}await postChunk(chunks[i],fileMD5,chunkMD5);}let postAllChunk = true;//判断切片是否都已上传完成for(let key in postChunkObj[fileMD5]){if(!postChunkObj[fileMD5][key].success){postAllChunk = false;break}}// 所有切片都已上传成功if(postAllChunk){//调用merge方法const typeArr = file.name.split('.');mergeChunks(fileMD5,chunkMD5Arr,typeArr[typeArr.length-1]);}else{//有切片上传失败，重新执行上传postFileObj[fileMD5].count++;if(postFileObj[fileMD5].count>10) return console.log('文件上传失败');//重新上传await upload(file);}}//blob转换成stringconst blodToString = (blob)=>{return new Promise((resolve,reject)=>{reader.onloadend = (e)=>{resolve(md5(e.target.result));}reader.readAsText(blob);});}//file转换成chunksconst fileToChunks = (file)=>{//切片数组let chunks = [];//每个chunk大小const chunkSize = 1024*128;//转换成多少个chunkconst chunkCount = Math.ceil(file.size/chunkSize);for(let i=0;i<chunkCount;i++){if(i==chunkCount-1){chunks.push(file.slice(i*chunkSize,file.size));}else{chunks.push(file.slice(i*chunkSize,(i+1)*chunkSize));}}return chunks;}//上传切片const postChunk = (chunk,fileMD5,chunkMD5)=>{let fd = new FormData();//文件流的key与multer的single方法的参数param,必须保持一致，不一致接收不到文件流/*** fd.append('xxx',chunk);* multer().single('xxxx');* **/fd.append('chunk',chunk);   fd.append('fileMD5',fileMD5);fd.append('chunkMD5',chunkMD5);let postCount = 0;return new Promise((resolve,reject)=>{instance.post('upload/upload',fd).then((res)=>{if(res.data&&res.data.success){postChunkObj[fileMD5][chunkMD5].success = true;resolve(console.log(`上传切片${chunkMD5}成功`));}else{//记录当前切片上传次数postChunkObj[fileMD5][chunkMD5].count++;//当前切片上传超过10次，终止上传if(postChunkObj[fileMD5][chunkMD5].count<11) { //上传失败，重新上传postChunk(chunk,fileMD5,chunkMD5);}}resolve(console.log(`上传切片${chunkMD5}失败`))})});}//合并多个chunkmergeChunks = (fileMD5,chunkMD5Arr,type)=>{// let fd = new FormData();// fd.append('chunk',Buffer.form(''));   // fd.append('fileMD5',fileMD5);// fd.append('chunkMD5Arr',chunkMD5Arr);// fd.append('type',type);// instance.post('upload/merge',fd).then((res)=>{// });axios.post('http://localhost:1990/upload/merge',{fileMD5,chunkMD5Arr,type}).then((res)=>{});}</script></body>
</html>