Node.js+jade+mongodb+mongoose实现爬虫分离入库与生成静态文件的方法

var http = require('http');
var cheerio = require('cheerio');
var mongoose = require('mongoose');
mongoose.Promise = global.Promise;
var DB_URL = 'mongodb://localhost:27017/crawler';

var aList = []; //博客文章列表信息
var aUrl = []; //博客所有的文章url

var db = mongoose.createConnection(DB_URL);
db.on('connected', function (err) {
 if (err) {
  console.log(err);
 } else {
  console.log('db connected success');
 }
});
var Schema = mongoose.Schema;
var arcSchema = new Schema({
 id: Number, //文章id
 title: String, //文章标题
 url: String, //文章链接
 body: String, //文章内容
 entry: String, //摘要
 listTime: Date //发布时间
});
var Article = db.model('Article', arcSchema);

function saveArticle(arcInfo) {
 var arcModel = new Article(arcInfo);
 arcModel.save(function (err, result) {
  if (err) {
   console.log(err);
  } else {
   console.log(`${arcInfo['title']} 插入成功`);
  }
 });
}

function filterArticle(html) {
 var $ = cheerio.load(html);
 var arcDetail = {};
 var title = $("#cb_post_title_url").text();
 var href = $("#cb_post_title_url").attr("href");
 var re = /\/(\d+)\.html/;
 var id = href.match(re)[1];
 var body = $("#cnblogs_post_body").html();
 return {
  id: id,
  title: title,
  url: href,
  body: body
 };
}

function crawlerArc(url) {
 var html = '';
 var str = '';
 var arcDetail = {};
 http.get(url, function (res) {
  res.on('data', function (chunk) {
   html += chunk;
  });
  res.on('end', function () {
   arcDetail = filterArticle(html);
   saveArticle(arcDetail);
   if ( aUrl.length ) {
    setTimeout(function () {
     if (aUrl.length) {
      crawlerArc(aUrl.shift());
     }
    }, 100);
   }else {
    console.log( '采集任务完成' );
    return;
   }
  });
 });
}

function filterHtml(html) {
 var $ = cheerio.load(html);
 var arcList = [];
 var aPost = $("#content").find(".post-list-item");
 aPost.each(function () {
  var ele = $(this);
  var title = ele.find("h2 a").text();
  var url = ele.find("h2 a").attr("href");
  ele.find(".c_b_p_desc a").remove();
  var entry = ele.find(".c_b_p_desc").text();
  ele.find("small a").remove();
  var listTime = ele.find("small").text();
  var re = /\d{4}-\d{2}-\d{2}\s*\d{2}[:]\d{2}/;
  listTime = listTime.match(re)[0];

  arcList.push({
   title: title,
   url: url,
   entry: entry,
   listTime: listTime
  });
 });
 return arcList;
}

function nextPage(html) {
 var $ = cheerio.load(html);
 var nextUrl = $("#pager a:last-child").attr('href');
 if (!nextUrl) return getArcUrl(aList);
 var curPage = $("#pager .current").text();
 if (!curPage) curPage = 1;
 var nextPage = nextUrl.substring(nextUrl.indexOf('=') + 1);
 if (curPage < nextPage) crawler(nextUrl);
}

function crawler(url) {
 http.get(url, function (res) {
  var html = '';
  res.on('data', function (chunk) {
   html += chunk;
  });
  res.on('end', function () {
   aList.push(filterHtml(html));
   nextPage(html);
  });
 });
}

function getArcUrl(arcList) {
 for (var key in arcList) {
  for (var k in arcList[key]) {
   aUrl.push(arcList[key][k]['url']);
  }
 }
 crawlerArc(aUrl.shift());
}

var url = 'http://www.cnblogs.com/ghostwu/';
crawler(url);

var fs = require('fs');
var jade = require('jade');

var mongoose = require('mongoose');
mongoose.Promise = global.Promise;
var DB_URL = 'mongodb://localhost:27017/crawler';

var allArc = [];
var count = 0;

var db = mongoose.createConnection(DB_URL);
db.on('connected', function (err) {
 if (err) {
  console.log(err);
 } else {
  console.log('db connected success');
 }
});
var Schema = mongoose.Schema;
var arcSchema = new Schema({
 id: Number, //文章id
 title: String, //文章标题
 url: String, //文章链接
 body: String, //文章内容
 entry: String, //摘要
 listTime: Date //发布时间
});
var Article = db.model('Article', arcSchema);

function makeHtml(arcDetail) {
 str = jade.renderFile('./views/layout.jade', arcDetail);
 ++count;
 fs.writeFile('./html/' + count + '.html', str, function (err) {
  if (err) {
   console.log(err);
  }
  console.log( `${arcDetail['id']}.html创建成功` + count );
  if ( allArc.length ){
   setTimeout( function(){
    makeHtml( allArc.shift() );
   }, 100 );
  }
 });
}

function getAllArc(){
 Article.find( {}, function( err, arcs ){
  allArc = arcs;
  makeHtml( allArc.shift() );
 } ).sort( { 'id' : 1 } );
}
getAllArc();