backend-init

.env

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+DB_NAME = "uml"
+DB_USER = "root"
+DB_PASSWORD = "123456"
+DB_HOST = "localhost"

.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-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

app.js

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+var createError = require('http-errors');
+var express = require('express');
+var path = require('path');
+var cookieParser = require('cookie-parser');
+var logger = require('morgan');
+
+//优先读取环境变量
+require("dotenv").config()
+//引入数据库连接
+require("./dao/db")
+
+//引入路由
+const userRouter = require('./routes/user');
+
+var app = express();
+
+//使用各种中间件
+app.use(logger('dev'));
+app.use(express.json());
+app.use(express.urlencoded({
+  extended: false
+}));
+app.use(cookieParser());
+app.use(express.static(path.join(__dirname, 'public')));
+
+//使用路由中间件
+app.use('/', userRouter);
+
+// catch 404 and forward to error handler
+app.use(function (req, res, next) {
+  next(createError(404));
+});
+
+// 错误捕获
+app.use(function (err, req, res, next) {
+  // set locals, only providing error in development
+  res.locals.message = err.message;
+  res.locals.error = req.app.get('env') === 'development' ? err : {};
+
+  // render the error page
+  res.status(err.status || 500);
+
+});
+
+module.exports = app;

bin/www

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+#!/usr/bin/env node
+
+/**
+ * Module dependencies.
+ */
+
+var app = require('../app');
+var debug = require('debug')('backend: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);
+
+/**
+ * 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);
+  console.log("监听3000端口")
+}

dao/db.js

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+const sequelize = require("./dbConnect")
+const userModel = require("./model/userModel")
+const md5 = require("md5")
+//将数据模型和表进行同步
+async function test() {
+    await sequelize.sync({
+        alter: true
+    })
+
+    //将需要数据的表初始化
+    const userCount = await userModel.count()
+    if (!userCount) {
+        //需要初始化
+        await userModel.create({
+            loginId: "test",
+            loginPwd: md5("123")
+        })
+
+        console.log("用户数据初始化完毕")
+    }
+
+    console.log("数据库数据准备完成")
+}
+test()

dao/dbConnect.js

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+const {
+    Sequelize
+} = require("sequelize")
+
+const sequelize = new Sequelize(process.env.DB_NAME, process.env.DB_USER, process.env.DB_PASSWORD, {
+    host: process.env.DB_HOST,
+    dialect: "mysql",
+    logging: false
+});
+
+
+module.exports = sequelize

dao/model/userModel.js

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+const sequelize = require("../dbConnect")
+const {
+    DataTypes
+} = require("sequelize")
+
+module.exports = sequelize.define("user", {
+    loginId: {
+        type: DataTypes.STRING,
+        allowNull: false
+    },
+    loginPwd: {
+        type: DataTypes.STRING,
+        allowNull: false
+    }
+}, {
+    freezeTableName: true,
+    createdAt: false,
+    updatedAt: false,
+})

package.json

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+{
+  "name": "backend",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "start": "nodemon -x npm run server",
+    "server": "node ./bin/www"
+  },
+  "dependencies": {
+    "cookie-parser": "~1.4.4",
+    "debug": "~2.6.9",
+    "dotenv": "^16.4.5",
+    "express": "~4.16.1",
+    "http-errors": "~1.6.3",
+    "jade": "~1.11.0",
+    "md5": "^2.3.0",
+    "morgan": "~1.9.1",
+    "mysql2": "^3.11.4",
+    "sequelize": "^6.37.5"
+  }
+}

public/stylesheets/style.css

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

routes/user.js

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+var express = require('express');
+var router = express.Router();
+
+/* GET home page. */
+router.post('/login', async function (req, res, next) {
+
+    console.log("loging...")
+});
+
+module.exports = router;