crossplatform---Nodejs in Visual Studio Code 03.学习Express

1.开始

下载源码：https://github.com/sayar/NodeMVA

Express组件：npm install express -g（全局安装）

2.ExpressRest

打开目录08_ExpressREST

app.js

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var express = require('express'); var app = express(); <br>//捕获GET方法，并处理返回一个Json，比C#写Json简单多了啊 app.get('/', function (req, res) {     res.json({ message: 'hooray! welcome to our api!' }); }); <br>//侦听8080端口 app.listen(process.env.PORT || 8080);

现在项目都用html/js了，写个node几行代码搞定json restful，还带web服务器，感觉神清气爽啊！

打开CMD让项目运行起来

1 2	$ cd 08_EXPRESSREST $ node app

3.AdvancedRESTAPI

打开目录12_AdvancedRESTAPI

app.js：初始化Express环境注册路由

routes/api.js ：rest api的具体实现代码

app.js中，注册路由代码十分简单

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//初始化一个api.js实例 var api = require('./routes/api');   //初始化一个express.js实例 var app = express();   //将指定url路由处理程序指向api.js文件 app.use('/api', api);

routes/api.js中对每个api后的url按GET\PUT\POST\DELETE分别处理

Resource	GET	PUT	POST	DELETE
Collection URI, such as http://api.example.com/v1/dogs/	List all the dogs	Replace all the dogs with a new collection of dogs.	Create a new dog in the collection.	Delete the entire dog collection.
Element URI, such as http://api.example.com/v1/dog/1	Get a specific dog.	Replace a dog in the collection with another dog.	Not used.	Delete the dog from the collection.

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var express = require('express'); var router = express.Router();   var dogs = [   {     "dog_id": "0",     "dog_name": "Ginger"   },   {     "dog_id": "1",     "dog_name": "Ruby"   },   {     "dog_id": "2",     "dog_name": "Buddy"   } ];   /* GET all dogs */ router.get('/dogs/', function(req, res, next) {   res.json(dogs); });   /* PUT replace all dogs */ router.put('/dogs/', function(req, res, next) {   console.log(req.body);   dogs = req.body;   res.json({"STATUS": "200 OK"}); });   /* POST create a new dog */ router.post('/dogs/', function(req, res, next) {   dogs.push(req.body)   res.json({"STATUS": "200 OK"}); });   /* DELETE delete the entire dog collection */ router.delete('/dogs/', function(req, res, next) {   dogs = [];   res.json({"STATUS": "200 OK"}); });     /* GET a specific dog */ router.get('/dogs/:id', function(req, res, next) {   var i = 0;   var dog = null;   for(i = 0; i != dogs.length; i++){     if(dogs[i].dog_id == req.params.id){       dog = dogs[i];       break;     }   }   dog !== null ? res.json(dog) : res.json({"STATUS": "404 NOT FOUND"}) });   /* PUT replace a specific dog with another dog */ router.put('/dogs/:id', function(req, res, next) {   var i = 0;   var dog = null;   for(i = 0; i != dogs.length; i++){     if(dogs[i].dog_id == req.params.id){       dog = dogs[i];       break;     }   }   if(dog !== null){     dog.dog_name = req.body['dog_name']     res.json({"STATUS": "200 OK"});   } else {     res.json({"STATUS": "404 NOT FOUND"});   } });   /* DELETE a specific dog from the collection */ router.delete('/dogs/:id', function(req, res, next) {   var i = 0;   for(i = 0; i != dogs.length; i++){     if(dogs[i].dog_id == req.params.id){       dogs.splice(i, 1);       return res.json({"STATUS": "200 OK"});     }   }   return res.json({"STATUS": "404 NOT FOUND"}); });     module.exports = router;

http://www.cnblogs.com/mengkzhaoyun/p/5355796.html