Golang html encoding解析

package main

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

// encoding determine for html page , eg: gbk gb2312 GB18030
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
}

func main() {
    resp, err := http.Get("http://www.zhenai.com/zhenghun")
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    e := determineEncoding(resp.Body)
    reader := transform.NewReader(resp.Body, e.NewDecoder())
    if resp.StatusCode == http.StatusOK {
        bodyBytes, err := ioutil.ReadAll(reader)
        if err != nil {
            panic(err)
        }
        fmt.Printf("%s\n", bodyBytes)
    }
}