package main

import (
	"bufio"
	"fmt"
	"golang.org/x/net/html/charset"
	"golang.org/x/text/encoding"
	"golang.org/x/text/transform"
	"io"
	"io/ioutil"
	"net/http"
)

func determineEncoding(r io.Reader) encoding.Encoding {
       //编码判断
	bytes, err := bufio.NewReader(r).Peek(1024)
	if err != nil {
		panic(err)
	}
	e, _, _ := charset.DetermineEncoding(bytes, ",")
	return e

}
func main() {
	resp, err := http.Get("http://www.baidu.com")
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close() //最后关闭，先进后出

	if resp.StatusCode != http.StatusOK {
		fmt.Println("Error:status code", resp.StatusCode)
		return
	}
	e := determineEncoding(resp.Body)
	utf8Reader := transform.NewReader(resp.Body, e.NewDecoder())
	all, err := ioutil.ReadAll(utf8Reader)
	//utf8Reader:=transform.NewReader(resp.Body,simplifiedchinese.GBK.NewDecoder())

	//下面是不加编码判断的
	//all, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		panic(err)
	}
	fmt.Printf("%s\n", all)

}