Build web application by express
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Express is a popular web framework for Node.js that is fast, simple, and easy to learn. It allows for routing, middleware, template engines like Jade and Mustache, and handling errors. Common tasks like making HTTP requests and handling cookies/sessions are simplified. The forever module can be used to keep a Node.js app running persistently in production.
![Routes
function loadUser(req, res, next) {
var user = users[req.params.id];
if (user) {
req.user = user;
next();
} else {
next(new Error('Failed to load user ' +
req.params.id));
}
}
app.get('/user/:id', loadUser, function(req, res){
res.send('Viewing user ' + req.user.name);
});](https://image.slidesharecdn.com/buildwebapplicationbyexpress-110716061356-phpapp01/85/Build-web-application-by-express-11-320.jpg)
![Cookie & Session
function loadUser(req, res, next) {
if (req.session.user) {
return req.session.user;
}
var user = users[req.params.id];
if (user) {
req.session.user = req.user = user;
next();
} else {
next(new Error('Failed to load user ' +
req.params.id));
}
}](https://image.slidesharecdn.com/buildwebapplicationbyexpress-110716061356-phpapp01/85/Build-web-application-by-express-12-320.jpg)
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Build web application by express
- 1. express Web weibo.com/mengxy www.imeigu.com
- 2. • • •
- 3. • • Web • • • •
- 4. • • Web • HTML
- 6. node.js Web
- 7. Node HTTP • cookie parser • session • •
- 8. Express • Express by TJ Holowaychuk is an extremely popular web framework. It’s fast, simple, and easy to learn, and even better — it’s actively maintained ——Alex Young from dailyjs.com
- 9. demo • git clone https://github.com/visionmedia/ express.git • npm install express • node bin/express /tmp/foo && cd /tmp/foo • npm install -d
- 10. var express = require('express'); var app = express.createServer(); app.configure(function(){ app.use(express.bodyParser()); app.use(express.cookieParser()); app.use(express.session({ secret: 'your secret here' })); app.use(app.router); }); app.get('/', function(req, res){ res.render('Hello world'); }); app.listen(3000);
- 11. Routes function loadUser(req, res, next) { var user = users[req.params.id]; if (user) { req.user = user; next(); } else { next(new Error('Failed to load user ' + req.params.id)); } } app.get('/user/:id', loadUser, function(req, res){ res.send('Viewing user ' + req.user.name); });
- 12. Cookie & Session function loadUser(req, res, next) { if (req.session.user) { return req.session.user; } var user = users[req.params.id]; if (user) { req.session.user = req.user = user; next(); } else { next(new Error('Failed to load user ' + req.params.id)); } }
- 13. Do HTTP request • node http •
- 14. request • git clone https://github.com/mikeal/ request.git • npm install request
- 15. var request = require('request'); request( {uri:'http://www.google.com'}, function (error, response, body) { if (!error && response.statusCode == 200) { sys.puts(body) // Print the google web page. } })
- 16. Template Engines • Haml • Jade • EJS • CoffeeKup •
- 18. Stache • Stache is mustache.js for your node express apps app.set('view engine', 'mustache') app.register(".mustache", require('stache'));
- 19. app.get('/', function (req, res) { res.render("index", { locals: { title: "Title content", body: "Page content" }, partials: { heading: '<title>{{title}}</title>' } }); }); <!-- index.mustache --> <html> <head> {{>heading}} </head> <body> {{{body}}} </body> </html>
- 20. app.get('/', function (req, res) { res.render("index", { locals: { title: "Title content", body: "Page content" }, partials: { heading: '<title>{{title}}</title>' } }); }); <html> <head> <!-- index.mustache --> <title>Title content</title> <html> </head> <head> {{>heading}} </head> <body> Page content </body> <body> {{{body}}} </body> </html> </html>
- 22. BUG
- 23. BUG NodeJS
- 24. BUG NodeJS
- 25. node node
- 26. node node 1. try{…} catch(error){…}
- 27. node node 1. try{…} catch(error){…} 2. process.on('uncaughtException', function (err) {//doSomething}
- 28. app.get("/err", function(req, res, next){ fs.readFile('file', function(err, data){ if (err) {throw err;} }); })
- 29. app.get("/err", function(req, res, next){ fs.readFile('file', function(err, data){ if (err) {next(err);} }); })
- 30. app.get("/err", function(req, res, next){ fs.readFile('file', function(err, data){ if (err) {next(err);} }); }) app.error(function(err, req, res){ console.err(err.stack); res.render("500.html", { locals: { page_title: '500_ _i ' }, status: 500 }); });
- 31. express tips • try{}catch(e){} • routes callback error throw error next() express • uncaughtException node endless world
- 32. One more tool
- 33. Forever • • Github: https://github.com/indexzero/ forever • npm install forever • forever start app.js
- 34. Thank You! PS: We Are Hiring! weibo.com/mengxy [email protected]