golang中base64的编码和解码可以用内置库encoding/base64

package main

import (
    "encoding/base64"
    "fmt"
    "log"
)

func main() {
    input := []byte("hello golang base64 快乐编程http://www.01happy.com +~")

    // 演示base64编码
    encodeString := base64.StdEncoding.EncodeToString(input)
    fmt.Println(encodeString)

    // 对上面的编码结果进行base64解码
    decodeBytes,err := base64.StdEncoding.DecodeString(encodeString)
    if err != nil {
        log.Fatalln(err)
    }
    fmt.Println(string(decodeBytes))

    fmt.Println()

    // 如果要用在url中，需要使用URLEncoding
    uEnc := base64.URLEncoding.EncodeToString([]byte(input))
    fmt.Println(uEnc)

    uDec,err := base64.URLEncoding.DecodeString(uEnc)
    if err != nil {
        log.Fatalln(err)
    }
    fmt.Println(string(uDec))
}

运行输出：

go run encode.go 
aGVsbG8gZ29sYW5nIGJhc2U2NCDlv6vkuZDnvJbnqItodHRwOi8vd3d3LjAxaGFwcHkuY29tICt+
hello golang base64 快乐编程http://www.01happy.com +~

aGVsbG8gZ29sYW5nIGJhc2U2NCDlv6vkuZDnvJbnqItodHRwOi8vd3d3LjAxaGFwcHkuY29tICt-
hello golang base64 快乐编程http://www.01happy.com +~