Simple configuration and database connection of NodeJS build project

The main contents are as follows:

• Load exprss module
• Create app app
• Load template processing
• Set up static file hosting
• Load database module
• Blog offline
• Processing post requests
• Cookie settings

Load exprss module

var express = require('express');

Create app application (equivalent to NodeJS Http.createServer();)

The code block syntax follows the standard markdown code, for example:

var app = express();

Load template processing module (used to process templates such as HTML)

var swig = require('swig');

• Configure the application template and define the template engine used by the current template

app.engine('html',swig.renderFile); //Parameters: 1. The name of the template engine, which is also the suffix of the template file; 2. The method used to parse and process the template content

• Define template storage directory

app.set('views','./views'); //Parameter: the first parameter must be views, and the second is directory

• Template engine for registration

app.set('view engine', 'html'); //Parameter: the first parameter must be view engine, and the second parameter corresponds to the first parameter of engine

• Cancel template cache (in development mode)

swig.setDefaults({ cache: false });

Set static file hosting (such as css,image and other static files)

• For example, when the url accessed by the user starts with public, the file under the corresponding "dirname +" / public "will be returned directly

app.use('/public',express.static(__dirname + '/public'));

Load database module

var mongoose = require('mongoose');
//Connect to database
mongoose.connect('mongodb://username:password@host:port/database?options...',{useMongoClient: true},function(err){
    if(err){
        console.log(err);
    }else{
        console.log('Database connection successful');
        //Listen for http requests
        app.listen(8081);
    }
});

Load the body parser and process the data submitted by post

var bodyParser = require('body-parser');
app.use( bodyParser.urlencoded({extended: true}) );

Cookie related settings

• First, load the cookies module

var Cookies = require('cookies');
req.cookies = new Cookies(req, res);

• Store cookie, set method (at login)

//Take setting cookie: userInfo for example
req.cookies.set('userInfo',JSON.stringify({
    _id: userInfo._id,
    username: userInfo.username
}));

• Get cookie, get method

req.cookies.get('userInfo')

• An example of the full version is as follows:

1.Obtain cookie
 app.use( function(req, res, next){
    req.cookies = new Cookies(req, res);
    //Resolve cookie information of login user
    req.userInfo = {};
    if(req.cookies.get('userInfo')){
        try{
            req.userInfo = JSON.parse(req.cookies.get('userInfo'));
        }catch (e){}
    }
    next();
});
2.storage cookie
 responseData.userInfo = {
    _id: userInfo._id,
    username: userInfo.username
};
req.cookies.set('userInfo',JSON.stringify({
    _id: userInfo._id,
    username: userInfo.username
}));

2018/4/8