Golang爬虫下载资源到本地

通过Glang爬取猛男图片到本地保存；

package main

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

//http读取网页数据写入result返回
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 result, err
}

var path string = "D:/test/Gundam/"

//保存图片到本地
func saveImg(index int, url string, page chan int) {
	//图片httpbody
	fmt.Println(index, "-----", url)

	//爬取的网站重复使用了这张图
	if url == "http://images.17173.com/gd/images/ms/15019.gif" {
		return
	}

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

	//打开文件流
	picName := path + strconv.Itoa(index) + ".gif"
	f, errf := os.Create(picName)
	if errf != nil {
		fmt.Println("os create err:", errf)
		return
	}
	defer f.Close()

	buf := make([]byte, 4096)

	//读httpbody数据写入文件流
	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 <- index
}

//爬取图片
func spiderPic(data string) {

	str := regexp.MustCompile("