go实现base64编码的四种方式

go的encoding/base64有四种编码方式：

package main


import (
    "encoding/base64"
    "fmt"
)


func main() {
    msg := []byte("Hello world. 你好，世界！")


    // 标准编码
    encoded := base64.StdEncoding.EncodeToString(msg)
    fmt.Println(encoded)
    // SGVsbG8gd29ybGQuIOS9oOWlve+8jOS4lueVjO+8gQ==


    decoded, _ := base64.StdEncoding.DecodeString(encoded)
    fmt.Println(string(decoded))
    // Hello world. 你好，世界！


    // 常规编码，末尾不补 =
    encoded = base64.RawStdEncoding.EncodeToString(msg)
    fmt.Println(encoded)
    // SGVsbG8gd29ybGQuIOS9oOWlve+8jOS4lueVjO+8gQ


    decoded, _ = base64.RawStdEncoding.DecodeString(encoded)
    fmt.Println(string(decoded))
    // Hello world. 你好，世界！


    // URL safe 编码
    encoded = base64.URLEncoding.EncodeToString(msg)
    fmt.Println(encoded)
    // SGVsbG8gd29ybGQuIOS9oOWlve-8jOS4lueVjO-8gQ==


    decoded, _ = base64.URLEncoding.DecodeString(encoded)
    fmt.Println(string(decoded))
    // Hello world. 你好，世界！


    // URL safe 编码，末尾不补 =
    encoded = base64.RawURLEncoding.EncodeToString(msg)
    fmt.Println(encoded)
    // SGVsbG8gd29ybGQuIOS9oOWlve-8jOS4lueVjO-8gQ


    decoded, _ = base64.RawURLEncoding.DecodeString(encoded)
    fmt.Println(string(decoded))
    // Hello world. 你好，世界！
}