node.js实现抓取代理ip
主要文件：index.js
/* * 支持：node.js v7.9.0 */ const cheerio=require('cheerio'); const fetch =require('node-fetch'); const Promise=require('bluebird'); let mongoose=require('mongoose'); Promise.promisifyAll(mongoose); let Schema=mongoose.Schema; mongoose.connect('mongodb://localhost:27017/ipproxypool'); let IPpool=new Schema({ ip:{type:String,unique:true} }) let Ipproxy=mongoose.model('IP',IPpool); function fetchUrl(url){ fetch(url,{ method:'get', headers:{ } }) .then(res=>res.text()) .then(body=>{ let $=cheerio.load(body); let length=$('#list table tbody').find('tr').length; for (let i=0;i<length;i++){ let ipaddress= $('#list table tbody').find('tr').eq(i).find('td').eq(0).text() ; let port = $('#list table tbody').find('tr').eq(i).find('td').eq(1).text(); console.log(`IP:${ipaddress}:${port}`); let ip=`${ipaddress}:${port}` let ippool=new Ipproxy({ ip:ip }) ippool.save(); } }) } var sleep = function (time) { return new Promise(function (resolve, reject) { setTimeout(function () { resolve('ok'); }, time); }) }; const pageNumber=10; var start = async function(){ for(let j=1;j<pageNumber;j++){ console.log(`当前是第${j}次等待..`); fetchUrl(`${j}/`); await sleep(1500); } } start();
包支持 ： package.json
{ "name": "demo-4-ipproxypool", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "author": "false-l", "license": "", "devDependencies": { "babel-preset-es2015": "^6.24.1", "babel-preset-react": "^6.24.1", "babel-preset-stage-3": "^6.24.1" }, "dependencies": { "babel-core": "^6.24.1", "bluebird": "^3.5.0", "cheerio": "^0.22.0", "koa": "^2.2.0", "koa-router": "^7.1.1", "mongoose": "^4.9.6", "node-fetch": "^1.6.3" } }
本地需要安装mongodb数据库,用于存储抓取到的ip，目前还未实现ip验证。写这个主要是处于好奇。
上面的代码就可以实现抓取ip代理网站的ip并存到mongodb数据库中。
下面在放出一个基于koa2的api接口的简易服务器实现
server
const Promise=require('bluebird'); let mongoose=require('mongoose'); const koa=require('koa'); const app=new koa(); var router = require('koa-router')(); Promise.promisifyAll(mongoose); let Schema=mongoose.Schema; mongoose.connect('mongodb://localhost:27017/ipproxypool'); let IPpool=new Schema({ ip:{type:String,unique:true} }) let Ipproxy=mongoose.model('IP',IPpool); app.use(async (ctx, next) => { await next(); var data=await Ipproxy.find({},function(err,ips){ var ipmap=[]; ips.forEach(function(ip){ ipmap[ip._id]=ip; //console.log(ip) }); }) var map=data.map(ip=>ip.ip); ctx.response.type = 'text/json'; ctx.response.body = map; }); app.listen(3000); console.log('server listen:3000')
至于为什么既有promise又有async，是因为对异步语法还不是很熟，怎么会怎么写了。
使用方式：
根据package.json
npm install // 安装支持
node index.js //获取代理 ip
node server.js //运行简易ip接口