Golang 之 Base62 編碼

這是一個建立於 的文章，其中的資訊可能已經有所發展或是發生改變。

Base62 編碼用62個可見字元來編碼資訊，也就是所謂的62進位，可用於縮短地址之類的。實現起來也很簡單。當然，這個實現跟別人家的有可能不一樣，反正自己能編能解就行。 

package mainimport (    "math"    "strings")const CODE62  = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"const CODE_LENTH = 62var EDOC = map[string]int{"0":0,"1":1,"2":2,"3":3,"4":4,"5":5,"6":6,"7":7,"8":8,"9":9,"a":10,"b":11,"c":12,"d":13,"e":14,"f":15,"g":16,"h":17,"i":18,"j":19,"k":20,"l":21,"m":22,"n":23,"o":24,"p":25,"q":26,"r":27,"s":28,"t":29,"u":30,"v":31,"w":32,"x":33,"y":34,"z":35,"A":36,"B":37,"C":38,"D":39,"E":40,"F":41,"G":42,"H":43,"I":44,"J":45,"K":46,"L":47,"M":48,"N":49,"O":50,"P":51,"Q":52,"R":53,"S":54,"T":55,"U":56,"V":57,"W":58,"X":59,"Y":60,"Z":61, }/** * 編碼 整數 為 base62 字串 */func Encode(number int) string {    if number == 0 {        return "0"    }    result := make([]byte , 0)    for number > 0 {        round  := number / CODE_LENTH        remain := number % CODE_LENTH        result = append(result,CODE62[remain])        number  = round    }    return string(result)}/** * 解碼字串為整數 */func Decode(str string) int {    str = strings.TrimSpace(str)    var result int = 0    for index,char := range []byte(str){        result +=  EDOC[string(char)] * int(math.Pow(CODE_LENTH,float64(index)))    }    return result}

 

裡面寫入程式碼了 CODE_LENGTH 是不想每次去算一下長度，省點時間。