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：

 1 /** 
 2  * 应用程序的入口文件
 3 */
 4 //加载express模块
 5 const express = require('express');
 6 const bodyParser = require('body-parser');
 7 const http = require('http');
 8 const path = require('path');
 9 const cookieParser = require('cookie-parser');
10 const api = require('./routes/api');
11 const logConfig = require('./logs/logconfig/logconfig');
12 const requestLogger = logConfig.getLogger();//根据需要获取logger
13 const loginFlag = require('./routes/checklogin');
14 const app = express();
15 //设置跨域访问
16 app.all('*', function (req, res, next) {
17   if(req.headers.origin) {
18       res.header("Access-Control-Allow-Origin", `${req.headers.origin}`);
19   } else {
20     res.header("Access-Control-Allow-Origin", `*`);
21   }
22   res.header('Access-Control-Allow-Methods', 'PUT, GET, POST, DELETE, OPTIONS');
23   res.header("Access-Control-Allow-Credentials", "true");
24   res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept,x-access-token, x-access-site");
25   res.header("Access-Control-Expose-Headers", "*");
26     if(req.method === "OPTIONS") {
27       return res.end();
28   } 
29   next();
30 });
31 // view engine setup
32 app.set('views', path.join(__dirname, 'views'));
33 app.set('view engine', 'jade');
34 logConfig.useLogger(app, requestLogger);
35 app.use(express.json({limit: '50mb'}));
36 app.use(express.urlencoded({ limit: '50mb',extended: true }));
37 app.use(cookieParser());
38 app.use(express.static(path.join(__dirname, 'public')));
39 
40 //MARK:  健康检查
41 app.get('/healthz', (req, res) => {
42   res.status(200).send({
43     error: false,
44     result: 'healthz working'
45     })
46 });
47 
48 // //先检查是否登录
49 app.use('/api', (req, res, next) => {
50   loginFlag.authentication(req, res, next);
51 })
52 
53 app.use('/api', api);
54 
55 // catch 404 and forward to error handler
56 app.use(function (req, res, next) {
57   var err = new Error('Not Found');
58   err.status = 404;
59   next(err);
60 });
61 
62 // error handler
63 app.use(function (err, req, res, next) {
64   // set locals, only providing error in development
65   res.locals.message = err.message;
66   res.locals.error = req.app.get('env') === 'development' ? err : {};
67 
68   // render the error page
69   res.status(err.status || 500);
70   res.send('error');
71 });
72 module.exports = app;

routes部分重要代码：

1 const express = require('express');
2 const router = express.Router();
3 const Home=require('../action/home/home');
4 
5 router.get('/v2/home/getactions',Home.GetActions);
6 router.post('/v2/home/deleteaction',Home.DeleteAction);
7 router.post('/v2/home/operationactions',Home.OperationActions);
8 
9 module.exports = router;

actions部分重要代码：

 1 const pSqlClientExecute = require('../../plugs/postgresqldb');
 2 const Util = require('../../utils/utils');
 3 const fs = require("fs");
 4 const util = require("util");
 5 const ejsexcel = require('../../download/ejsexcel');
 6 const readFileAsync = util.promisify(fs.readFile);
 7 const writeFileAsync = util.promisify(fs.writeFile);
 8 const Home = {};
 9 
10 Home.GetBIChartsData = (req, res, next) => {
11     console.log('fatppis call api {/v2/home/getbichartsdata}')
12     let { DateTime,Shift_ID, Area,CustomerFamily_ID,OrderBy} = req.query;
13     if(CustomerFamily_ID==null||CustomerFamily_ID==undefined){
14         CustomerFamily_ID='';
15     }
16     let databaseFn = async function() {
17         let sqlList = `SELECT * FROM "sp_FOP_GetBIChartsData"('${DateTime}',${Shift_ID},'${Area}','${CustomerFamily_ID}','${OrderBy}')`;
18         let sqlListFn = await pSqlClientExecute(req,sqlList, []);
19         return sqlListFn;
20     }
21     databaseFn().then((data) => {
22         res.send({
23             status: 200,
24             data: data
25         });
26     })
27     .catch((error) => {
28         res.status(400).json({
29             msg: error.detail||error.message
30         })
31     });
32 }

package.json文件

 1 {
 2   "name": "server",
 3   "version": "1.0.0",
 4   "description": "",
 5   "main": "app.js",
 6   "scripts": {
 7     "start": "node ./bin/www"
 8   },
 9   "author": "",
10   "license": "ISC",
11   "dependencies": {
12     "body-parser": "^1.18.2",
13     "cookie-parser": "~1.4.3",
14     "cookies": "^0.7.1",
15     "express": "^4.16.3",
16     "express-session": "^1.15.6",
17     "node-rest-client": "^3.1.0",
18     "path": "^0.12.7",
19     "pg": "^7.4.1",
20     "log4js": "^3.0.6"
21   }
22 }

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