Colly provides a clean interface to write any kind of crawler/scraper/spider

 

Scraping Framework for Golang http://go-colly.org/

 

https://github.com/gocolly/colly

package main

import (
   "fmt"

   "github.com/gocolly/colly"
   "time"
   "regexp"
   "strings"
)

/*
task
http://www.cnhan.com/hyzx/
http://www.cnhan.com/shantui/
http://www.cnhan.com/pinfo/

http://www.heze.cn/info
http://www.heze.cn/qiye/

采集站点当日更新数据的客户联系方式

*/
func getTodayUrls() []string {
   var todayUrls []string
   // Instantiate default collector
   c := colly.NewCollector(
      colly.AllowedDomains("www.cnhan.com"),
   )
   // On every a element which has href attribute call callback
   // 类选择器
   //url仅在本页
   c.OnHTML(".showSort a[href]", func(e *colly.HTMLElement) {
      link := e.Attr("href")
      todayUrls = append(todayUrls, link)
      fmt.Printf("Link found: %q -> %s\n", e.Text, link)
   })

   // Start scraping on http://www.cnhan.com/shantui/
   c.Visit("http://www.cnhan.com/shantui/")

   //起始路由改变
   // Instantiate default collector
   c = colly.NewCollector(
      colly.AllowedDomains("www.cnhan.com"),
      colly.URLFilters(
         //请求页面的正则表达式，满足其一即可
         //http://www.cnhan.com/hyzx/
         //http://www.cnhan.com/hyzx/index-all-2.html
         //硬代码：当天最多更新99页http://www.cnhan.com/hyzx/index-all-99.html
         //^[1-9][0-9]{0,1}[^0-9]{0,1}$
         regexp.MustCompile("^http://www.cnhan.com/hyzx/(.{0}$)|(index-all-[1-9][0-9]{0,1}[^0-9]{0,1}\\.html$)"),
      ),
   )
   // On every a element which has href attribute call callback
   c.OnHTML("a[href]", func(e *colly.HTMLElement) {
      link := e.Attr("href")
      fmt.Printf("Link found: %q -> %s\n", e.Text, link)
      c.Visit(e.Request.AbsoluteURL(link))
      datetime := time.Now().Format("20060102")
      fmt.Println(datetime)
      reg := regexp.MustCompile(datetime) // http://www.cnhan.com/hyzx/20180827/7109076.html 通过url格式过滤出今天的url
      data := reg.Find([]byte(link))
      regRes := len(data)
      if regRes > 0 {
         link = "http://www.cnhan.com/hyzx/" + link
         todayUrls = append(todayUrls, link)
      }
   })

   // Before making a request print "Visiting ..."
   c.OnRequest(func(r *colly.Request) {
      fmt.Println("Visiting", r.URL.String())
   })

   // Start scraping on http://www.cnhan.com/shantui/
   c.Visit("http://www.cnhan.com/hyzx/")

   //起始路由改变
   // Instantiate default collector
   c = colly.NewCollector(
      colly.AllowedDomains("www.cnhan.com"),
      colly.URLFilters(
         //请求页面的正则表达式，满足其一即可
         //http://www.cnhan.com/pinfo/
         //http://www.cnhan.com/pinfo/index-5.html
         //硬代码：当天最多更新99页http://www.cnhan.com/pinfo/index-99.html
         regexp.MustCompile("^http://www.cnhan.com/pinfo/(.{0}$)|(index-[1-9][0-9]{0,1}[^0-9]{0,1}\\.html$)"),
      ),
   )
   // On every a element which has href attribute call callback
   c.OnHTML("a[href]", func(e *colly.HTMLElement) {
      link := e.Attr("href")
      fmt.Printf("Link found: %q -> %s\n", e.Text, link)
      c.Visit(e.Request.AbsoluteURL(link))
      //文本过滤
      eDate := e.ChildText(".span2")
      //http://www.cnhan.com/pinfo/313257.html   周口水泥彩砖具有的特色是什么2018.08.27
      datetime := time.Now().Format("2006.01.02")
      if (strings.Contains(eDate, datetime)) {
         link := e.Attr("href")
         link = "http://www.cnhan.com" + link
         fmt.Printf("Link found: %q -> %s\n", e.Text, link)
         todayUrls = append(todayUrls, link)
      }
   })

   // Before making a request print "Visiting ..."
   c.OnRequest(func(r *colly.Request) {
      fmt.Println("Visiting", r.URL.String())
   })

   // Start scraping on http://www.cnhan.com/shantui/
   c.Visit("http://www.cnhan.com/pinfo/")

   //起始路由改变
   // Instantiate default collector
   c = colly.NewCollector(
      colly.AllowedDomains("www.heze.cn"),
   )
   // On every a element which has href attribute call callback
   // 类选择器
   c.OnHTML(".news_list_r a[href]", func(e *colly.HTMLElement) {
      link := e.Attr("href")
      fmt.Printf("Link found: %q -> %s\n", e.Text, link)
      todayUrls = append(todayUrls, link)
   })

   // Before making a request print "Visiting ..."
   c.OnRequest(func(r *colly.Request) {
      fmt.Println("Visiting", r.URL.String())
   })

   // Start scraping on http://www.cnhan.com/shantui/
   c.Visit("http://www.heze.cn/info/")

   /*
   站内目标url
   http://www.heze.cn/info/
   http://www.heze.cn/qiye/
   检测思路：
   1、按父url，分别进入 http://www.heze.cn/qiye/18240670888/show-37-1367148.html  http://www.heze.cn/info/LEbigong/show-1-13931879.html
      与2反
   2、按照全站进入
      优点：过滤规则简单，代码代码简单；爬取结果数据不便于分类处理，比如产品类型、发布时间；
      缺点：爬爬取速度慢
   */

   //起始路由改变
   //http://www.heze.cn/qiye/  该页面、其主体子页面，刷新，内容变化
   //http://www.heze.cn/qiye/list-8.html
   // Instantiate default collector
   c = colly.NewCollector(
      colly.AllowedDomains("www.heze.cn"),
      colly.URLFilters(
         //请求页面的正则表达式，满足其一即可
         regexp.MustCompile("^http://www.heze.cn/qiye/(.{0}$)|(list-\\d+-\\d+\\.html$)"),
      ),
   )
   // On every a element which has href attribute call callback
   c.OnHTML("a[href]", func(e *colly.HTMLElement) {
      link := e.Attr("href")
      fmt.Printf("Link found: %q -> %s\n", e.Text, link)
      c.Visit(e.Request.AbsoluteURL(link))
      // http://www.heze.cn/qiye/hongfei688/show-44-14825619.html
      reg := regexp.MustCompile("^http://www.heze.cn/qiye/[0-9a-zA-Z]+/show-\\d+-\\d+\\.html$")
      data := reg.Find([]byte(link))
      regRes := len(data)
      if regRes > 0 {
         fmt.Printf("Link found: %q -> %s\n", e.Text, link)
         todayUrls = append(todayUrls, link)
      }
   })

   // Before making a request print "Visiting ..."
   c.OnRequest(func(r *colly.Request) {
      fmt.Println("Visiting", r.URL.String())
   })

   // Start scraping on http://www.heze.cn/qiye/
   c.Visit("http://www.heze.cn/qiye/")

   return todayUrls
}

func main() {
   var todayUrls = getTodayUrls()
   fmt.Println(todayUrls)
   fmt.Println(len(todayUrls))
}