go语言带cookie的net客户端请求与[]byte转string

puzzle input

+12
-10
-4
-8
+18
-1
-13
...

net/html

resp, err := http.Get("http://example.com/")
if err != nil {
	// handle error
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
// ...

检查元素cookiehttp.Get()cookieNewRequest*Request

client := &http.Client{}
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		log.Fatal(err)
	}
	req.Header.Set("Cookie", "name=value")
	resp, err := client.Do(req)

	robots, err := ioutil.ReadAll(resp.Body)


  resp.Body.Close()//必须要关闭Body

ioutil.ReadAll()[]byte[]bytestringstring(b)unsafeunsafe

func BytesString(b []byte) string {
  return *(*string)(unsafe.Pointer(&b))
}

[]byte*byte*stringunsafe.Pointer*byte*stringreflect.StringHeaderreflect.SliceHeaderregexpFindAllString[]stringstrconv.Atoi()

package main
import (
   "fmt"
   "io/ioutil"
   "log"
   "net/http"
   "os"
   "regexp"
   "strconv"
   "unsafe"
)
func BytesString(b []byte) string {//[]byte 转string
   return *(*string)(unsafe.Pointer(&b))
}
func getPuzzle(url string) string {//从网页抓取数据
   client := &http.Client{}
   req, err := http.NewRequest("GET", url, nil)
   if err != nil {
   	log.Fatal(err)
   }
   req.Header.Set("Cookie", "session=53616c7xxx")
   resp, err := client.Do(req)
   robots, err := ioutil.ReadAll(resp.Body)
   resp.Body.Close()
   str := BytesString(robots)
   return str
}
func sum(num []int) int {
   sum := 0
   for _, n := range num {
   	sum += n
   }
   return sum
}
func strtoint(str []string) []int {//string转int
   num := make([]int, len(str))
   for i := 0; i < len(str); i++ {
   	flag := str[i][0]
   	chafre, _ := strconv.Atoi(str[i][1:])
   	switch flag {
   	case '+':
   		num[i] = chafre
   	case '-':
   		num[i] = -chafre
   	}
   }
   return num
}
func main() {
   change := getPuzzle("https://adventofcode.com/2018/day/1/input")
   re := regexp.MustCompile("[+|-][0-9]*")//正则表达式
   str := re.FindAllString(change, -1)
   num := strtoint(str)
   sum := sum(num)
   fmt.Printf("sum is %d\n", sum)
}

如果有更好的方法，欢迎私信，哈哈哈···