nodejs 学习(4) express+mongoose
2024-08-23 09:39:46
一、关于安装和启动：
1、设置环境变量:D:\Program Files\MongoDB\bin
2、启动时需要cd到bin 目录，然后 mongod --dbpath "D:\mongdb\data"设置数据库存储路径
二、例子（登录注册表单）
1
2 index.js
var express=require("express"),
bodyParser=require('body-parser'),
multer=require('multer'),
mongoose=require('mongoose'),
cookieParser = require('cookie-parser'),
session = require('express-session'),
app=express();
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/my-website');
db = mongoose.connection;
db.once('open', function callback () {
console.log("yah");
});
var kittySchema = mongoose.Schema({
first: String,
last: String,
email: {type:String,unique:true},
password:{type:String,index:true}
});
var User = mongoose.model('user', kittySchema);
app.use(bodyParser.json()); // for parsing application/json
app.use(bodyParser.urlencoded({ extended: true })); // for parsing application/x-www-form-urlencoded
app.use(multer()); // for parsing multipart/form-data
app.use(cookieParser());
app.use(session({
secret: 'my secret',
resave: false,
saveUninitialized: true
}));
app.set("view engine","jade");
app.use(function(req,res,next){
if(req.session.loggedIn){
res.locals.authenticated=true;
User.findById(req.session.loggedIn,function(err,doc){
if(err){
return next(err);
}
if(doc){
res.locals.me=doc;
}
next();
});
}else{
res.locals.authenticated=false;
next();
}
});
app.get("/",function(req,res){
res.render('index');
});
app.get("/login",function(req,res){
res.render("login");
})
app.get("/signup",function(req,res){
res.render("signup");
});
app.post("/signup",function(req,res,next){
var user = new User(req.body.user);
user.save(function(err){
if(err) return next(err);
res.redirect("/login/"+user["email"]);
});
});
app.get("/login/:signupEmail",function(req,res){
res.render('login',{signupEmail:req.params.signupEmail});
});
app.post("/login",function(req,res){
User.findOne({"email":req.body.user.email,"password":req.body.user.password},function(err,doc){
if(err){
return next(err);
}
if(!doc){
return res.send("<p>User not found.Go back and try again</p>");
}
var sess=req.session;
req.session.loggedIn=doc._id.toString();
res.redirect("/");
});
});
app.get("/logout",function(req,res){
var sess=req.session;
req.session.loggedIn="",
res.redirect("/");
});
app.listen(3000,function(){
console.log("app listening on *:3000");
});
3 模板 (注意缩进)
3.1 layout.jade
doctype html
html
head
title MongoDB example
body
h1 My first MongoDB app
hr
block body
3.2 index.jade
extends layout
block body
if (authenticated)
p Welcome back,#{me.first}
a(href="/logout") Logout
else
p Welcome new visitor!
ul
li: a(href="/login") Login
li: a(href="/signup") Signup
3.3 login.jade
extends layout
block body
form(action="/login",method="POST")
fieldset
legend Log in
if(signupEmail)
p
Congratulations on signing up! Please login below.
input(name="user[email]",type="text",value=signupEmail)
else
p
label Email
input(name="user[email]",type="text")
p
label Password
input(name="user[password]",type="password")
p
button Submit
p
a(href="/") Go back
3.4 signup.jade
extends layout
block body
form(action="/signup",method="POST")
fieldset
legend Sign
p
label First
input(name="user[first]",type="text")
p
label last
input(name="user[last]",type="text")
p
label Email
input(name="user[email]",type="text")
p
label Password
input(name="user[password]",type="password")
p
button Submit
p
a(href="/") Go back
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