go基础库之解码非Unicode字符集中的字符串

package main

import (
	"io"
	"os"

	"golang.org/x/text/encoding/charmap"
)

func main() {

	f, err := os.OpenFile("out.txt", os.O_CREATE|os.O_RDWR,
		os.ModePerm|os.ModeAppend)
	if err != nil {
		panic(err)
	}
	defer f.Close()

	// 解码unicode
	encoder := charmap.Windows1250.NewEncoder()
	writer := encoder.Writer(f)
	io.WriteString(writer, "Gdańsk")

}

package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"strings"

	"golang.org/x/text/encoding/charmap"
)

func main() {

	// 打开 windows-1250 文件
	f, err := os.Open("out.txt")
	if err != nil {
		panic(err)
	}
	defer f.Close()

	// 全部以原始内容读入
	b, err := ioutil.ReadAll(f)
	if err != nil {
		panic(err)
	}
	content := string(b)

	fmt.Println("Without decode: " + content)

	// unicode 解码
	decoder := charmap.Windows1250.NewDecoder()
	reader := decoder.Reader(strings.NewReader(content))
	b, err = ioutil.ReadAll(reader)
	if err != nil {
		panic(err)
	}
	fmt.Println("Decoded: " + string(b))

}

$ go run decode.go
Without decode: Gda�sk
Decoded: Gdańsk