客服电话
APP下载
迪恩网络APP
随时随地掌握行业动态
官方微信
扫描二维码
关注迪恩网络微信公众号
|
一、爬什么？ 1、明确目标 ： 知道你准备在那个范围或者网站去搜索 2、爬： 将所有的网站的内容全部爬下来 3、取：去掉对我们没用处的数据 4、处理数据：按照我们想要的方式存储或使用
二、百度贴吧小爬虫 需求：百度贴吧，每50页就翻页 https://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=0 https://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=50
示例： 单线程版本 package main
import (
"fmt"
"net/http"
"os"
"strconv"
)
//爬取网页内容
func HttpGet(url string) (result string, err error) {
resp, err1 := http.Get(url)
if err1 != nil {
err = err1
return
}
defer resp.Body.Close()
//读取网页body内容
buf := make([]byte, 1024*4)
for {
n, _ := resp.Body.Read(buf)
if n == 0 { //读取结束，或者，出问题
//fmt.Println("resp.Body.Read err = ", err)
break
}
result += string(buf[:n])
}
return
}
func DoWork(start, end int) {
fmt.Printf("正在爬取 %d 到 %d 的页面\n", start, end)
//明确目标 (要知道你准备在哪个范围或者网站去搜索)
for i := start; i <= end; i++ {
url := "http://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=" + strconv.Itoa((i-1)*50)
fmt.Println("url = ", url)
//2) 爬 (将所有的网站的内容全部爬下来)
result, err := HttpGet(url)
if err != nil {
fmt.Println("HttpGet err = ", err)
continue
}
//把内容写入到文件
fileName := strconv.Itoa(i) + ".html"
f, err1 := os.Create(fileName)
if err1 != nil {
fmt.Println("os.Create err1 = ", err1)
continue
}
f.WriteString(result) //写内容
f.Close() //关闭文件
}
}
func main() {
var start, end int
fmt.Printf("请输入起始页( >= 1) :")
fmt.Scan(&start)
fmt.Printf("请输入终止页( >= 起始页) :")
fmt.Scan(&end)
DoWork(start, end)
}
执行结果： 请输入起始页( >= 1) :1 //输入起始页 请输入终止页( >= 起始页) :10 //输入终止页 正在爬取 1 到 10 的页面 url = http://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=0 url = http://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=50 url = http://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=100 url = http://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=150 url = http://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=200 url = http://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=250 url = http://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=300 url = http://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=350 url = http://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=400 url = http://tieba.baidu.com/f?kw=%E7%BB%9D%E5%9C%B0%E6%B1%82%E7%94%9F&ie=utf-8&pn=450
|
请发表评论