安装golang.org/x/net/html、golang.org/x/text

在gopath的src目录下创建golang.org/x目录，进入到golang.org/x目录，执行命令：
git clone https://github.com/golang/net.git
git clone https://github.com/golang/text.git

具体实现

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 main() {
	resp, err := http.Get("http://www.zhenai.com/zhenghun")
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		fmt.Println("Error status code:", resp.StatusCode)
		return
	}

	// 编码转换
	htmlEncoding:=determineEncoding(resp.Body)
	reader := transform.NewReader(resp.Body, htmlEncoding.NewDecoder())
	body, err := ioutil.ReadAll(reader)

	//body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		panic(err)
	}
	fmt.Printf("%s \n", body)
}

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