21.Node-RESTful API的用法

题记

        node.js中restful api的用法

HTTP方法

        GET - 用于获取数据。

        PUT - 用于更新或添加数据。

        DELETE - 用于删除数据。

        POST - 用于添加数据。

创建RESTful

创建Json文件

        创建users.json文件：

{
   "user1" : {
      "name" : "mahesh",
      "password" : "password1",
      "profession" : "teacher",
      "id": 1
   },
   "user2" : {
      "name" : "suresh",
      "password" : "password2",
      "profession" : "librarian",
      "id": 2
   },
   "user3" : {
      "name" : "ramesh",
      "password" : "password3",
      "profession" : "clerk",
      "id": 3
   }
}

获取用户列表

var express = require('express');
var app = express();
var fs = require("fs");
 
app.get('/listUsers', function (req, res) {
   fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data) {
       console.log( data );
       res.end( data );
   });
})
 
var server = app.listen(8080, function () {
 
  var host = server.address().address
  var port = server.address().port
 
  console.log("应用实例，访问地址为 http://%s:%s", host, port)
 
})

 添加用户

var express = require('express');
var app = express();
var fs = require("fs");
 
//添加的新用户数据
var user = {
   "user4" : {
      "name" : "mohit",
      "password" : "password4",
      "profession" : "teacher",
      "id": 4
   }
}
 
app.get('/addUser', function (req, res) {
   // 读取已存在的数据
   fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data) {
       data = JSON.parse( data );
       data["user4"] = user["user4"];
       console.log( data );
       res.end( JSON.stringify(data));
   });
})
 
var server = app.listen(8080, function () {
 
  var host = server.address().address
  var port = server.address().port
  console.log("应用实例，访问地址为 http://%s:%s", host, port)
 
})

 显示用户详情

var express = require('express');
var app = express();
var fs = require("fs");
 
app.get('/:id', function (req, res) {
   // 首先我们读取已存在的用户
   fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data) {
       data = JSON.parse( data );
       var user = data["user" + req.params.id] 
       console.log( user );
       res.end( JSON.stringify(user));
   });
})
 
var server = app.listen(8080, function () {
 
  var host = server.address().address
  var port = server.address().port
  console.log("应用实例，访问地址为 http://%s:%s", host, port)
 
})

 删除用户

var express = require('express');
var app = express();
var fs = require("fs");
 
var id = 2;
 
app.get('/deleteUser', function (req, res) {
 
   // First read existing users.
   fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data) {
       data = JSON.parse( data );
       delete data["user" + id];
       
       console.log( data );
       res.end( JSON.stringify(data));
   });
})
 
var server = app.listen(8080, function () {
 
  var host = server.address().address
  var port = server.address().port
  console.log("应用实例，访问地址为 http://%s:%s", host, port)
 
})

后记

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