go-爬圖片

go語言爬取圖片

注：動態加載出來的爬取不到，或怕取出來圖片出錯，代碼中的網頁是能夠正常爬取的

package main

import (
    "fmt"
    "io"
    "net/http"
    "os"
    "regexp"
    "strconv"
    _ "strings"
)

func SaveImg(idx int, url string, page chan int) {
    path := "D:/gogogo/src/go-爬蟲/圖片爬取/main/images/" + strconv.Itoa(idx+1) + ".jpg"
    f, err := os.Create(path)
    //  resp, err1 := http.Get(url)
    if err != nil {
        fmt.Println("err:", err)
        return
    }

    defer f.Close()
    resp, err := http.Get(url)
    if err != nil {
        fmt.Println("err:", err)
        return
    }
    defer resp.Body.Close()

    buf := make([]byte, 4096)
    for {
        n, err2 := resp.Body.Read(buf)
        if n == 0 {
            break
        }
        if err2 != nil && err2 != io.EOF {
            err = err2
            return
        }
        f.Write(buf[:n])

    }
    page <- idx
}

func HttpGet(url string) (result string, err error) {
    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 {
            break
        }
        if err2 != nil && err2 != io.EOF {
            err = err2
            return
        }
        result += string(buf[:n])
    }
    return
}

func main() {
    url := "http://sc.chinaz.com/tupian/ribenmeinv.html"
    result, err := HttpGet(url)
    if err != nil {
        fmt.Println("err:", err)
        return
    }
    //  (?s:(.*?))
    ret1 := regexp.MustCompile(`<img src2="(?s:(.*?))"`)

    alls := ret1.FindAllStringSubmatch(result, -1)

    page := make(chan int)
    n := len(alls)

    for idx, imgURL := range alls {
        //      fmt.Println(imgURL[1])
        go SaveImg(idx, imgURL[1], page)

    }
    for i := 0; i < n; i++ {
        fmt.Printf("第%d下載完成\n", <-page)
    }

}