NodeJS express框架的使用

首先，可以通过npm或者淘宝镜像cnpm全局安装epress框架，这里不具体说了

npm install -g express
npm install -g express-generator

新建一个项目
express -e xxx

目录说明：

bin：项目的启动文件，也可以放其他脚本。

node_modules：用来存放项目的依赖库。

public：用来存放静态文件(css,js,img)。

routes：路由控制器。

views：视图目录(相当于MVC中的V)。

app.js：项目入口及程序启动文件。

package.json：包描述文件及开发者信息。

-----------------------------------------------其他，自己创建使用------------------------------

actions：控制器,对请求的操作(相当于MVC中的C)。

plugs：数据库操作、邮件帮助等文件。

config：配置目录。

Dockerfile：做自动化部署的配置文件。

.gitignore：上传git的忽略文件配置。

README.md：项目说明文件。

app.js文件：

 /**
  * 应用程序的入口文件
 */
 //加载express模块
 const express = require('express');
 const bodyParser = require('body-parser');
 const http = require('http');
 const path = require('path');
 const cookieParser = require('cookie-parser');
 const api = require('./routes/api');
 const logConfig = require('./logs/logconfig/logconfig');
 const requestLogger = logConfig.getLogger();//根据需要获取logger
 const loginFlag = require('./routes/checklogin');
 const app = express();
 //设置跨域访问
 app.all('*', function (req, res, next) {
   if(req.headers.origin) {
       res.header("Access-Control-Allow-Origin", `${req.headers.origin}`);
   } else {
     res.header("Access-Control-Allow-Origin", `*`);
   }
   res.header('Access-Control-Allow-Methods', 'PUT, GET, POST, DELETE, OPTIONS');
   res.header("Access-Control-Allow-Credentials", "true");
   res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept,x-access-token, x-access-site");
   res.header("Access-Control-Expose-Headers", "*");
     if(req.method === "OPTIONS") {
       return res.end();
   }
   next();
 });
 // view engine setup
 app.set('views', path.join(__dirname, 'views'));
 app.set('view engine', 'jade');
 logConfig.useLogger(app, requestLogger);
 app.use(express.json({limit: '50mb'}));
 app.use(express.urlencoded({ limit: '50mb',extended: true }));
 app.use(cookieParser());
 app.use(express.static(path.join(__dirname, 'public')));

 //MARK:  健康检查
 app.get('/healthz', (req, res) => {
   res.status(200).send({
     error: false,
     result: 'healthz working'
     })
 });

 // //先检查是否登录
 app.use('/api', (req, res, next) => {
   loginFlag.authentication(req, res, next);
 })

 app.use('/api', api);

 // catch 404 and forward to error handler
 app.use(function (req, res, next) {
   var err = new Error('Not Found');
   err.status = 404;
   next(err);
 });

 // error handler
 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);
   res.send('error');
 });
 module.exports = app;

routes部分重要代码：

 const express = require('express');
 const router = express.Router();
 const Home=require('../action/home/home');

 router.get('/v2/home/getactions',Home.GetActions);
 router.post('/v2/home/deleteaction',Home.DeleteAction);
 router.post('/v2/home/operationactions',Home.OperationActions);

 module.exports = router;

actions部分重要代码：

 const pSqlClientExecute = require('../../plugs/postgresqldb');
 const Util = require('../../utils/utils');
 const fs = require("fs");
 const util = require("util");
 const ejsexcel = require('../../download/ejsexcel');
 const readFileAsync = util.promisify(fs.readFile);
 const writeFileAsync = util.promisify(fs.writeFile);
 const Home = {};

 Home.GetBIChartsData = (req, res, next) => {
     console.log('fatppis call api {/v2/home/getbichartsdata}')
     let { DateTime,Shift_ID, Area,CustomerFamily_ID,OrderBy} = req.query;
     if(CustomerFamily_ID==null||CustomerFamily_ID==undefined){
         CustomerFamily_ID='';
     }
     let databaseFn = async function() {
         let sqlList = `SELECT * FROM "sp_FOP_GetBIChartsData"('${DateTime}',${Shift_ID},'${Area}','${CustomerFamily_ID}','${OrderBy}')`;
         let sqlListFn = await pSqlClientExecute(req,sqlList, []);
         return sqlListFn;
     }
     databaseFn().then((data) => {
         res.send({
             status: 200,
             data: data
         });
     })
     .catch((error) => {
         res.status(400).json({
             msg: error.detail||error.message
         })
     });
 }

package.json文件

 {
   "name": "server",
   "version": "1.0.0",
   "description": "",
   "main": "app.js",
   "scripts": {
     "start": "node ./bin/www"
   },
   "author": "",
   "license": "ISC",
   "dependencies": {
     "body-parser": "^1.18.2",
     "cookie-parser": "~1.4.3",
     "cookies": "^0.7.1",
     "express": "^4.16.3",
     "express-session": "^1.15.6",
     "node-rest-client": "^3.1.0",
     "path": "^0.12.7",
     "pg": "^7.4.1",
     "log4js": "^3.0.6"
   }
 }

项目源码链接：https://github.com/ZhijianPu/nodejsapidemo.git