first

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist.*
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

app.js

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+const Koa = require('koa')
+const app = new Koa()
+const views = require('koa-views')
+const json = require('koa-json')
+const onerror = require('koa-onerror')
+const logger = require('koa-logger')
+const {koaBody} = require('koa-body')//   支持form-data，支持文件，不支持x-www-form-urlencoded，不可同时使用，
+
+const index = require('./routes/index')
+const users = require('./routes/users')
+
+// error handler
+onerror(app)
+
+// middlewares
+app.use(json())
+app.use(logger())
+app.use(require('koa-static')(__dirname + '/public'))
+
+app.use(views(__dirname + '/views', {
+    extension: 'pug'
+}))
+
+// logger
+app.use(async (ctx, next) => {
+    const start = new Date()
+    await next()
+    const ms = new Date() - start
+    console.log(`${ctx.method} ${ctx.url} - ${ms}ms`)
+})
+app.use(koaBody({
+    multipart: true, // 支持文件上传
+    encoding: 'gzip',
+    strict: false,//  参数:如果启用，则不解析GET，HEAD，DELETE请求，默认为true
+    formidable: {
+        // uploadDir:path.join(__dirname,'public/upload/'), // 设置文件上传目录
+        keepExtensions: true,    // 保持文件的后缀
+        maxFieldsSize: 10 * 1024 * 1024, // 文件上传大小
+        // onFileBegin:(name,file) => { // 文件上传前的设置
+        //     // console.log(`name: ${name}`);
+        //     // console.log(file);
+        // },
+    }
+}));
+
+// routes
+app.use(index.routes(), index.allowedMethods())
+app.use(users.routes(), users.allowedMethods())
+
+// error-handling
+app.on('error', (err, ctx) => {
+    console.error('server error', err, ctx)
+});
+
+module.exports = app

bin/www

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+#!/usr/bin/env node
+
+/**
+ * Module dependencies.
+ */
+
+var app = require('../app');
+var debug = require('debug')('demo:server');
+var http = require('http');
+
+/**
+ * Get port from environment and store in Express.
+ */
+
+var port = normalizePort(process.env.PORT || '3000');
+// app.set('port', port);
+
+/**
+ * Create HTTP server.
+ */
+
+var server = http.createServer(app.callback());
+
+/**
+ * Listen on provided port, on all network interfaces.
+ */
+
+server.listen(port);
+server.on('error', onError);
+server.on('listening', onListening);
+
+/**
+ * Normalize a port into a number, string, or false.
+ */
+
+function normalizePort(val) {
+  var port = parseInt(val, 10);
+
+  if (isNaN(port)) {
+    // named pipe
+    return val;
+  }
+
+  if (port >= 0) {
+    // port number
+    return port;
+  }
+
+  return false;
+}
+
+/**
+ * Event listener for HTTP server "error" event.
+ */
+
+function onError(error) {
+  if (error.syscall !== 'listen') {
+    throw error;
+  }
+
+  var bind = typeof port === 'string'
+    ? 'Pipe ' + port
+    : 'Port ' + port;
+
+  // handle specific listen errors with friendly messages
+  switch (error.code) {
+    case 'EACCES':
+      console.error(bind + ' requires elevated privileges');
+      process.exit(1);
+      break;
+    case 'EADDRINUSE':
+      console.error(bind + ' is already in use');
+      process.exit(1);
+      break;
+    default:
+      throw error;
+  }
+}
+
+/**
+ * Event listener for HTTP server "listening" event.
+ */
+
+function onListening() {
+  var addr = server.address();
+  var bind = typeof addr === 'string'
+    ? 'pipe ' + addr
+    : 'port ' + addr.port;
+  debug('Listening on ' + bind);
+}

package.json

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+{
+  "name": "md5file",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "start": "node bin/www",
+    "dev": "node_modules\\.bin\\nodemon bin\\www",
+    "prd": "pm2 start bin/www",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "dependencies": {
+    "debug": "^4.1.1",
+    "koa": "^2.7.0",
+    "koa-body": "^6.0.1",
+    "koa-convert": "^1.2.0",
+    "koa-json": "^2.0.2",
+    "koa-logger": "^3.2.0",
+    "koa-onerror": "^4.1.0",
+    "koa-router": "^7.4.0",
+    "koa-static": "^5.0.0",
+    "koa-views": "^6.2.0",
+    "pug": "^2.0.3"
+  },
+  "devDependencies": {
+    "nodemon": "^1.19.1"
+  }
+}

public/stylesheets/style.css

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+body {
+  padding: 50px;
+  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
+}
+
+a {
+  color: #00B7FF;
+}

routes/fileStorage.js

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+const router = require('koa-router')()
+
+router.get('/', async (ctx, next) => {
+    await ctx.render('index', {
+        title: 'Hello Koa 2!'
+    })
+})
+
+router.get('/string', async (ctx, next) => {
+    ctx.body = 'koa2 string'
+})
+
+router.get('/json', async (ctx, next) => {
+    ctx.body = {
+        title: 'koa2 json'
+    }
+})
+
+module.exports = router

routes/index.js

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+const router = require('koa-router')()
+
+router.get('/', async (ctx, next) => {
+  await ctx.render('index', {
+    title: 'Hello Koa 2!'
+  })
+})
+
+router.get('/string', async (ctx, next) => {
+  ctx.body = 'koa2 string'
+})
+
+router.get('/json', async (ctx, next) => {
+  ctx.body = {
+    title: 'koa2 json'
+  }
+})
+
+module.exports = router

routes/users.js

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+const router = require('koa-router')()
+
+router.prefix('/users')
+
+router.get('/', function (ctx, next) {
+  ctx.body = 'this is a users response!'
+})
+
+router.get('/bar', function (ctx, next) {
+  ctx.body = 'this is a users/bar response'
+})
+
+module.exports = router

views/error.pug

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+extends layout
+
+block content
+  h1= message
+  h2= error.status
+  pre #{error.stack}

views/index.pug

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+extends layout
+
+block content
+  h1= title
+  p Welcome to #{title}

views/layout.pug

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+doctype html
+html
+  head
+    title= title
+    link(rel='stylesheet', href='/stylesheets/style.css')
+  body
+    block content