go-爬虫-百度贴吧（并发版）
2024-10-18 09:15:15
爬取百度贴吧的网页
非并发版
package main
import (
"fmt"
"io"
"net/http"
"os"
"strconv"
)
func HttpGet(url string) (result string, err error) {
// var result string
resp, err1 := http.Get(url)
if err1 != nil {
err = err1
return
}
defer resp.Body.Close()
buf := make([]byte, 4096)
for {
n, err2 := resp.Body.Read(buf)
if n == 0 {
fmt.Println("读取网页完成")
break
}
if err2 != nil && err2 != io.EOF {
err = err2
return
}
result += string(buf[:n])
}
return
}
func working(start, end int) {
fmt.Printf("正在爬取第%d到第%d页", start, end)
//爬取每一个网页
for i := start; i <= end; i++ {
url := "https://tieba.baidu.com/f?kw=vue&ie=utf-8&pn=" + strconv.Itoa((i-1)*50)
result, err := HttpGet(url)
if err != nil {
fmt.Println("httpGet err", err)
continue
}
// fmt.Println("result", result)
f, err := os.Create("第" + strconv.Itoa(i) + "页" + ".html")
if err != nil {
fmt.Println("HttpGet err", err)
continue
}
f.WriteString(result)
f.Close()
}
}
func main() {
var start, end int
fmt.Print("请输入起始页。。。")
fmt.Scan(&start)
fmt.Print("请输入终止页。。。")
fmt.Scan(&end)
working(start, end)
}
并发版
这个只是在上面的基础上加了管道和开了协程
package main
import (
"fmt"
"io"
"net/http"
"os"
"strconv"
)
func HttpGet(url string) (result string, err error) {
// var result string
resp, err1 := http.Get(url)
if err1 != nil {
err = err1
return
}
defer resp.Body.Close()
buf := make([]byte, 4096)
for {
n, err2 := resp.Body.Read(buf)
if n == 0 {
fmt.Println("读取网页完成\n")
break
}
if err2 != nil && err2 != io.EOF {
err = err2
return
}
result += string(buf[:n])
}
return
}
func SpiderPage(index int, page chan int) {
fmt.Printf("正在爬取第%d到页\n", index)
//爬取每一个网页
// for i := start; i <= end; i++ {
url := "https://tieba.baidu.com/f?kw=vue&ie=utf-8&pn=" + strconv.Itoa((index-1)*50)
result, err := HttpGet(url)
if err != nil {
fmt.Println("httpGet err", err)
return
}
// fmt.Println("result", result)
f, err := os.Create("第" + strconv.Itoa(index) + "页" + ".html")
if err != nil {
fmt.Println("HttpGet err", err)
return
}
f.WriteString(result)
f.Close()
// }
page <- index
}
func working2(start, end int) {
fmt.Printf("正在爬取第%d页到%d页\n", start, end)
page := make(chan int)
for i := start; i <= end; i++ {
go SpiderPage(i, page)
}
for i := start; i <= end; i++ {
fmt.Printf("第%d个页面爬取完成\n", <-page)
}
}
func main() {
var start, end int
fmt.Print("请输入起始页。。。")
fmt.Scan(&start)
fmt.Print("请输入终止页。。。")
fmt.Scan(&end)
working2(start, end)
}
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