Go秒爬博客园100页新闻

利用go语言的协程并发优势爬取网页速度相当之快，博客园100页新闻标题只需一秒即可全部爬取

package main

import (
 "bytes"
 "fmt"
 "github.com/puerkitobio/goquery"
 "log"
 "net/http"
 "runtime"
 "strconv"
 "sync"
)

func scraper(page string) string {
 // request the html page.
 scrapeurl := "https://news.cnblogs.com/n/page/" + page
 client := &http.client{}
 reqest, _ := http.newrequest("get", scrapeurl, nil)
 reqest.header.set("accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
 reqest.header.set("accept-charset", "gbk,utf-8;q=0.7,*;q=0.3")
 //reqest.header.set("accept-encoding", "gzip,deflate,sdch")
 reqest.header.set("accept-language", "zh-cn,zh;q=0.8")
 reqest.header.set("cache-control", "max-age=0")
 reqest.header.set("connection", "keep-alive")
 reqest.header.set("user-agent", "mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/68.0.3440.75 safari/537.36")
 res, err := client.do(reqest)
 if err != nil {
  log.fatal(err)
 }
 defer res.body.close()
 if res.statuscode != 200 {
  log.fatalf("status code error: %d %s", res.statuscode, res.status)
 }

 // load the html document
 doc, err := goquery.newdocumentfromreader(res.body)
 if err != nil {
  log.fatal(err)
 }

 // find the review items
 var buffer bytes.buffer
 buffer.writestring("**********scraped page " + page + "**********\n")
 doc.find(".content .news_entry").each(func(i int, s *goquery.selection) {
  // for each item found, get the band and title
  title := s.find("a").text()
  url, _ := s.find("a").attr("href")
  buffer.writestring("review " + strconv.itoa(i) + ": " + title + "\nhttps://news.cnblogs.com" + url + "\n")
 })
 return buffer.string()
}

func main() {
 runtime.gomaxprocs(runtime.numcpu())
 ch := make(chan string, 100)
 wg := &sync.waitgroup{}
 var page string
 for i := 1; i < 101; i++ {
  wg.add(1)
  go func(i int) {
   page = strconv.itoa(i)
   fmt.printf("scraping page %s...\n", page)
   ch <- scraper(page)
   wg.done()
  }(i)
 }
 wg.wait()

 //print result
 for i := 0; i < 101; i++ {
  fmt.println(<-ch)
 }
}

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